Go Back   MustangForums.com > Ford Mustang Tech > 5.0L (1979-1995) Mustang
Sign in using an external account
Register Forgot Password?
Search


5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Sponsored by Weld Racing


Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Need Help! Lots of Questions, just got a 1989 Cobra 5L

Reply
 
 
 
 
Thread Tools Search this Thread
Old 11-16-2010, 10:34 PM   #1
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default Need Help! Lots of Questions, just got a 1989 Cobra 5L

Hey just joined this forum hoping to get lots of good advice and info on my 1989 Stang. Allways wanted one found a pretty nice black one. Full body kit ect. Guy said engine was rebuilt to a 307. Looks like its in good shape, minor oil leaks. SOunds clean, runs smooth in neutral when i rev it up to 5 grand or so no knock or pings or shaking. Has plenty of torque. Just starting to run into lots of problems though. Noticing when im driving down the highway, hit 100 kmPH, the car violently starts shaking, only at that speed though. it sucks, i dunno what to look for or check other than driveline, like tranny, driveshaft, clutch? who knows.
Also I have my engine light coming on once and awhile, it just comes on and goes once and awhile, mostly at night time when i have my lights and everything on. Its weird. And tonight I was driving it hard for the first time and its very fast and powerful, goes sideways easy. Except every once and awhile, ill punch it and it pulls like hell up to 3000 rpm then its as if the power just dissapears, like the tires will spin up to 3000 rpm then they stop spinning in 1st gear, even on wet pavement its really weird, its as if there is a governor cutting the power in half after 3000 rpm, and sometimes it doesn't do that though, sometimes it will go through the entire rpm range with no problems, but only when im easy on the throttle, ? it has me stumped any help would be great. Also when im running her kinda hard, ill stop at a stop light and push in the clutch and my car will be reving at 2000 rpm and doesnt go away unless i turn car off and restart it. Heard about getting a computer thing to hook up and see what codes i get, but i have no idea what to get and how much id have to spend.
Bought this car to work on thru winter, so i have a nice running fast car for spring and summer. So i have lots of time. And the guy put after market Halo lights in it looks real good, but they are screwing up my voltage when i turn them on, and he said theres been a new alernator in it. I heard of people having to get new computers for these cars could that solve any of my problems?
Anyways any help would be great! i luv my car just want her to run right, and apprently it has 289 gears in it.
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
cobra5L307 is offline   Reply With Quote
Old 11-16-2010, 11:24 PM   #2
jthorn9
The Godfather
 
jthorn9's Avatar
 
Join Date: Sep 2005
Vehicle: 2013 Mustang GT CS
Location: College Station, Texas
Posts: 15,433
Jeremy Thorner jthorn9
Default

Firstly there were no 1989 Cobras, Cobras came back out in 1993.

As far as your issue goes it could be a lot of things but two biggies would be a failed sensor (your check engine light may be revealing that) and or a blown gasket (due to sudden power loss, but could also be caused by the sensor.

5.0s are funny little cars because not all the times do the engine code scans work because the ECUs are so old, in short the scan may show everything works fine when really there is an issue. Ex. my 5.0 had this problem with the EGR and throttle position sensors, both were failed but the scans did not show them as failed because they were still on, just not sending proper information. I mainly had problems once the car became hot and when turning it on/off/on again.

Sensors to look at would be the EGR, salt pepper shakers, throttle position sensor, intake air temperature sensor, air intake control sensor, and MAF. All can go out and still not fully trip a code on a 5.0 and cause similar issues as to what you're having.
__________________
13 Mustang GT CS - 380 RWHP 370 TQ
13 Mustang V6 PP - 270 RWHP 260 TQ

95 Mustang SVO - 400 RWHP 400 TQ sold
08 Mustang GT - 285 RWHP 305 TQ sold
99 Mustang Cobra - 280 RWHP 290 TQ sold
11 Mustang V6 - 270 RWHP 260 TQ sold
97 Mustang GT - 190 RWHP 250 TQ sold
00 Mustang V6 - 145 RWHP 184 TQ sold
98 Mustang V6 - 125 RWHP 210 TQ sold
jthorn9 is offline   Reply With Quote
Old 11-16-2010, 11:27 PM   #3
jthorn9
The Godfather
 
jthorn9's Avatar
 
Join Date: Sep 2005
Vehicle: 2013 Mustang GT CS
Location: College Station, Texas
Posts: 15,433
Jeremy Thorner jthorn9
Default

Also keep in mind it may be more than one of these sensors and usually it is. In short if you have the money to do so, I would change every one of these sensors, odds are they never been changed on the car and if not it's about time they get changed, remember these sensors are over 20 years old. I would also change the EGR valve while you're at it if it's still on the car and not removed by a previous owner.
__________________
13 Mustang GT CS - 380 RWHP 370 TQ
13 Mustang V6 PP - 270 RWHP 260 TQ

95 Mustang SVO - 400 RWHP 400 TQ sold
08 Mustang GT - 285 RWHP 305 TQ sold
99 Mustang Cobra - 280 RWHP 290 TQ sold
11 Mustang V6 - 270 RWHP 260 TQ sold
97 Mustang GT - 190 RWHP 250 TQ sold
00 Mustang V6 - 145 RWHP 184 TQ sold
98 Mustang V6 - 125 RWHP 210 TQ sold
jthorn9 is offline   Reply With Quote
Old 11-16-2010, 11:30 PM   #4
Five0hFox
3rd Gear Member
 
Five0hFox's Avatar
 
Join Date: May 2007
Vehicle: 1988 Ford Mustang GT
Location: Kansas
Posts: 766
Default

He's Canadian, in Canada the GT's were called Cobra's I do believe.
__________________
88GT T-Tops 5spD: BBK L/Ts, O/R H pipe, 3.55 gears: Extent of modifications.
Five0hFox is offline   Reply With Quote
Old 11-16-2010, 11:34 PM   #5
ALMOST STOCK
4th Gear Member
 
ALMOST STOCK's Avatar
 
Join Date: May 2007
Vehicle: 89 Mustang GT
Location: Calif
Posts: 1,884
Default

Quote:
Originally Posted by Five0hFox View Post
He's Canadian, in Canada the GT's were called Cobra's I do believe.

That is correct!!
__________________

Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
ALMOST STOCK is offline   Reply With Quote
Old 11-17-2010, 12:08 AM   #6
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default

Sweet thanks for the reply, And about it not being a cobra, i checked the VIN and it says its a cobra, built in Usa, has the badges on it as well.
Unless someone put them there, but either way its no big deal i got my favorite car out there.
But ya, i guess i could change all those sensors, the previous owner said something about a throttle position sensor, but i heard that one needs proffesionaly done. That's what I was thinking tho changing all the sensors that i can. And there's quite abit done to the engine, and it looks like there are vacuumm lines that are not connected to anything, but yet there is nothing around them that i can see that they can be hooked up to. I guess i could take some pics of the engine and see what you guys think. Also there is this guage on my engine, under the hood i dunno what it is. I think it may be fuel pressure?? it reads 40 psi i think.? i dont think its oil pressure because there are aftermarket guages inside for that, but the oil guage is not working at all. Im guessing its the sending unit. Iknow the guy said theres some high pressure fuel thing that was put in, like something about 20 pound injectors i think..He said its ready to be supercharged. Um...Im hopin its nota gasket, but mabee it is. I dont think it is cuz it seems to rip sometimes, and sometimes it doesnt. I guess i just a need a huge tuneup, but anything i could do myself would be awesome so i can save money.
Iknow the car has alot of km's on it, but they seem to all do. And this cars gears were changed so i hear that messes the KM guage, like it says there could be 120 000, but hey it might have 190 thousand right..but yeaa, i definately wanna fix this car up so i can race it this summer!
cobra5L307 is offline   Reply With Quote
Old 11-17-2010, 12:10 AM   #7
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default

what is the salt and pepper shaker?
cobra5L307 is offline   Reply With Quote
Old 11-17-2010, 10:06 AM   #8
ALMOST STOCK
4th Gear Member
 
ALMOST STOCK's Avatar
 
Join Date: May 2007
Vehicle: 89 Mustang GT
Location: Calif
Posts: 1,884
Default

The salt and pepper shakers are your 10 pin connectors.
Click the image to open in full size.

This is the extension for the 10 pin connector
Click the image to open in full size.
__________________

Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005

Last edited by ALMOST STOCK; 11-17-2010 at 12:31 PM.
ALMOST STOCK is offline   Reply With Quote
Old 11-17-2010, 01:58 PM   #9
1ATony
Former Sponsor
 
Join Date: Jul 2009
Vehicle: 92 Ford Mustang
Location: NH
Posts: 1,714
Default

The canadian Cobras always throw me for a loop too. Not sure why they made Cobras up there and not down here.
1ATony is offline   Reply With Quote
Old 11-17-2010, 08:07 PM   #10
Bubba 95SN
4th Gear Member
 
Join Date: Apr 2009
Vehicle: 1995 Ford Mustang GT
Location: N.C.
Posts: 1,891
Default

Maybe the Canadians were on to something before USA. Cobra...gee, their money is worth more than ours . Was there is 80 and was like .78 to US dollar. Now we are in the back seat.
Bubba 95SN is offline   Reply With Quote
Old 11-17-2010, 08:38 PM   #11
jjcsr74
1st Gear Member
 
jjcsr74's Avatar
 
Join Date: Apr 2008
Vehicle: 2006 Ford Mustang GT and 1995 Mustang GT
Location: Massachusetts
Posts: 122
jcocosr jjcsr74
Default

Quote:
Originally Posted by Five0hFox View Post
He's Canadian, in Canada the GT's were called Cobra's I do believe.

Bingo...
__________________


2006 Windveil Blue. 5 Speed. Parchment Int. Kenwood DNX7100, MB Quart. Nitrous Oxide Systems. Roush Shifter. Cervinis Upper-Lower Scoops. Magnaflow Exhaust. Roush Spoiler. BBK CAI. SCT Tune.

1995 Blue GT. 5 Speed. Grey Leather. CAI. Offroad H-Pipe and Flowmasters.
www.privatesectorfirearms.com
jjcsr74 is offline   Reply With Quote
Old 11-18-2010, 01:20 PM   #12
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default

Quote:
Originally Posted by ALMOST STOCK View Post
The salt and pepper shakers are your 10 pin connectors.
Click the image to open in full size.

This is the extension for the 10 pin connector
Click the image to open in full size.
sweet thanks, ill check it out.
cobra5L307 is offline   Reply With Quote
Old 11-19-2010, 06:56 PM   #13
jthorn9
The Godfather
 
jthorn9's Avatar
 
Join Date: Sep 2005
Vehicle: 2013 Mustang GT CS
Location: College Station, Texas
Posts: 15,433
Jeremy Thorner jthorn9
Default

All the sensors can be done yourself, doesn't take anything more than a flat head screw driver to change them. The TPS is a little hard at times because depending on things you may have to remove the throttle body to change it, but other than that, it's very easy to change.
__________________
13 Mustang GT CS - 380 RWHP 370 TQ
13 Mustang V6 PP - 270 RWHP 260 TQ

95 Mustang SVO - 400 RWHP 400 TQ sold
08 Mustang GT - 285 RWHP 305 TQ sold
99 Mustang Cobra - 280 RWHP 290 TQ sold
11 Mustang V6 - 270 RWHP 260 TQ sold
97 Mustang GT - 190 RWHP 250 TQ sold
00 Mustang V6 - 145 RWHP 184 TQ sold
98 Mustang V6 - 125 RWHP 210 TQ sold
jthorn9 is offline   Reply With Quote
Old 11-20-2010, 07:52 PM   #14
THOR74
1st Gear Member
 
THOR74's Avatar
 
Join Date: Dec 2009
Vehicle: 1991 Ford Mustang Cobra GT (Canadian Ed.)
Location: Ontario, Canada
Posts: 57
Default

In Canada they were called "Ford Mustang Cobra GT". My 1991 came like that, along with a 230 kph speedo, daytime running lights and the California emissions (including the four unit exhaust with two precats and two cats).

Mine even has a block heater...never used, of course.

Other than that, no difference vs. a normal US Mustang GT. Why was this done? My research is inconclusive - theories exist but I know of nothing official.
__________________
Original stock and mint cond. 1991 Ford Mustang Cobra GT (Canadian Edition), 85,000 miles, 5 speed, fact. sunroof, 2.73 TractionLok rear (gives great and long pulls on the highway - speed), muffler delete/straight pipes, K&N filter. 2nd owner since 1998 and still totally in love. "They're gonna bury me in this car."
THOR74 is offline   Reply With Quote
Old 11-20-2010, 08:48 PM   #15
ALMOST STOCK
4th Gear Member
 
ALMOST STOCK's Avatar
 
Join Date: May 2007
Vehicle: 89 Mustang GT
Location: Calif
Posts: 1,884
Default

Quote:
Originally Posted by THOR74 View Post
In Canada they were called "Ford Mustang Cobra GT". My 1991 came like that, along with a 230 kph speedo, daytime running lights
and the California emissions (including the four unit exhaust with two precats and two cats).

Mine even has a block heater...never used, of course.

Other than that, no difference vs. a normal US Mustang GT. Why was this done? My research is inconclusive - theories exist but I know of nothing official.
That confirms what I thought about all Mustangs from at least 89-93 having 4 cats and coming from the factory with them.
__________________

Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
ALMOST STOCK is offline   Reply With Quote
Old 11-22-2010, 10:00 PM   #16
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default

sweet ill try changin most senors. Thanks. Heres some pics i took of things Im not sure of. Except i opened a whole can of worms inspecting the car underneath. Found out who ever had it before must of ditched it. The cross member underneath the rad is bent pretty bad..And I think its been hit in the rear end, one of the quarter panels on the rear are a bit different than the other side, looks like theres been work done on it, sits alittle crooked, but can only see with a sharp eye. All i know i went under CARFAX, vin code says it has been in no accidents. So i dont think it was a horrible wreck. But i do think something hit the rear end. Which is probly why I have a vibrations at 100 km.
Also found i have a cracked clutch housing, pretty big crack, could be why im gettin a nasty vibration. Wont know until I fix it i guess. I just gotta pull the tranny. Which im gona do in the next couple weeks. Looking at the haynes manual doesnt look to hard. Also noticed the back seal on the engine must be leaking pretttty bad. Im thinking of gettin that stop engine leak stuff, heard it works pretty good. Or else I will see how much it will cost to fix that when the tranny is out, i just dont wanna get into seals cuz thats a big job..Um ya, heres some pics of some problems i found tonight! hopin to get some input ! enjoy
cobra5L307 is offline   Reply With Quote
Old 11-22-2010, 10:01 PM   #17
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default

**** How the hell do i post my pics from my camera on here
cobra5L307 is offline   Reply With Quote
Old 11-23-2010, 12:24 AM   #18
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default Ah I figured it out! heres th pics

Click the image to open in full size.

This seal is leaking, need replaced rigght. I put my finger on the seal and finger goes red with trannny fluid, thats not normal right? and could this cause vibration? theres alittle bit of play on it but barely, just a little. Not sure if that is normal

Click the image to open in full size.

Any idea what this is, i dont think its the drain plug

Click the image to open in full size.

Ouch looks like the old owner crashed in a ditch or something, rad seems to be fine though. Can i get this piece repaced?

Click the image to open in full size.

Check the crack out on the bell housing, had a better pic but it didnt load. Ciuld this be causing my vibrations? im sure it must have something to do with it, its a fairly bbig crack ouchhh. Have no idea how that happened

Click the image to open in full size.

here is another view of the crack

Click the image to open in full size.

what is thisss???!

Click the image to open in full size.

And this is?? i think its a fuel pressure guage???? apparently the car has a adjustable fuel ration thing, i dunno what it is or where it is or how to do that.

Click the image to open in full size.

This connector goes where?? I have no clueee, cant seem to find anything close around it that it may connect to...:S

Click the image to open in full size.

here are som vacuum lines, see one is connected, and one aint. I cant seem to figure out where that one goes, I can figure it out. And notice the connecter, therre is a cut off line on it?

Click the image to open in full size.

another pic of the vacuum line that i cant figure out where it goes

Click the image to open in full size.

oil pressure regulator right, how do i get this off? my oil pressure guages dont work need to know how to fix it, i guess changing this would be the first step rightt

Click the image to open in full size.

check this out, this sensor must not be working right. Its the spedo sensor right, its on the trannt, and also the wire to it is melted from laying on the exhaust.


Click the image to open in full size.

melted wire on the speedo cable i think...?


Click the image to open in full size.

any idea what this is??? cant figure it out its on the oil pan

Click the image to open in full size.

sub frame connectors

Click the image to open in full size.

car

Click the image to open in full size.

someone pleasse help me with this, i have no idea where this goes, old owner said its for the suspension something to do with racing..Yet I hve no idea where it goes to or what it isss...???

http://i1179.photobucket.com/albums/...g?t=1290492744

what would this be for, seems to be nothing hooked up to it

Click the image to open in full size.

engine

Click the image to open in full size.

more of car....

ANyways theres my problem lol..also i have sagging side skirts with new clips, dunno how to install it though....
cobra5L307 is offline   Reply With Quote
Old 11-23-2010, 12:27 AM   #19
cobra5L307
 
Join Date: Nov 2010
Vehicle: 1989 Ford Mustang Cobra
Location: Canada
Posts: 30
Default

oh ya the pic with the bent cross member for the rad i put the wrong description on it, i meant ouch looks like the old howner hit a ditch or something/ can i get that replaced??
cobra5L307 is offline   Reply With Quote
Old 11-23-2010, 04:33 PM   #20
ALMOST STOCK
4th Gear Member
 
ALMOST STOCK's Avatar
 
Join Date: May 2007
Vehicle: 89 Mustang GT
Location: Calif
Posts: 1,884
Default

1st pic… Could be due to a bad trans seal, or oil that has been blown back on the trans and drive shaft from the looks of the bellhousing and front of the trans.

2nd pic… Crushed radiator support

3rd pic….Could be the line from the Charcoal Canister to the gas tank ... it’s hard to tell

4th and 5th pic… Probably whatever crushed the radiator support also hit the bellhousing and cracked it

6th pic… Adjustable fuel pressure regulator

7th pic… Fuel pressure gauge

8th pic… Looks like the connector to your purge valve

9th and 10th pic… Black line goes to the Air Bypass valve, White line goes to the Air Diverter valve

11th pic… Oil pressure sender, it unscrews from that fitting sticking out of the engine

14th pic… Low oils sensor

15th pic … Sub frame connectors
__________________

Mustang Monthly Jan 2015- Feature
5.0 Mustang & Super Fords July 2005
ALMOST STOCK is offline   Reply With Quote
Old 11-23-2010, 04:33 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
1989, 40, 89, 99, canada, cobra, ford, gt, kmph, mustang, pavement, problems, sideways, svo, wet

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 11:52 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup