retard curve? - MustangForums.com


General Tech Ask model specific questions in the appropriate category below. All other general questions within.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-11-2009, 01:44 PM   #1  
ExtrmZ
4th Gear Member
Thread Starter
 
Join Date: Jan 2008
Location: Fargo, ND
Posts: 1,244
Default retard curve?

What would cause the ignition timing to retard? as the RPMs get higher, the spark gets more retarded.

any ideas?
ExtrmZ is offline   Reply With Quote
Old 11-11-2009, 06:23 PM   #2  
dreamer1uk
3rd Gear Member
 
dreamer1uk's Avatar
 
Join Date: Feb 2008
Location: IL
Posts: 877
Default

Hola,

A Knock Sensor will cause ignition timing to retard. How do you know the ECU is retarding the spark? Scan tool?
dreamer1uk is offline   Reply With Quote
Old 11-12-2009, 03:06 PM   #3  
ExtrmZ
4th Gear Member
Thread Starter
 
Join Date: Jan 2008
Location: Fargo, ND
Posts: 1,244
Default

the ecu is what controls how much advance/retard to give it. i unhooked the knock sensor and it did the same thing. When its unhooked it wouldnt sense a knock right?
ExtrmZ is offline   Reply With Quote
Old 11-12-2009, 08:23 PM   #4  
dreamer1uk
3rd Gear Member
 
dreamer1uk's Avatar
 
Join Date: Feb 2008
Location: IL
Posts: 877
Default

Hi,

Yes, thats right on the KS. However, it may run in a fail safe mode or limp mode if the KS is unplugged. I know on some of the Import vehicles, people will disconect the KS for performance, but im not sure how that will work on an OBD1 system

You could test your current KS by using a DVOM on the A/C voltage scale and gently tap on the KS and look for a change in A/C voltage.

I would start by doing to voltage drop tests on your ECU, then onto your KS, MAP, ECT, TPS and so forth.

Hope this helps.

Last edited by dreamer1uk; 11-12-2009 at 08:48 PM.
dreamer1uk is offline   Reply With Quote
Old 11-16-2009, 09:03 PM   #5  
ExtrmZ
4th Gear Member
Thread Starter
 
Join Date: Jan 2008
Location: Fargo, ND
Posts: 1,244
Default

I took it to a guy i know at the Ford dealership. He is a transmission specialist (doesnt know a whole lot about motors) he scanned it, and the only codes it threw were for the EGR (which is taken out) and one for the MAP sensor. He said on the older cars, the MAP sensors didnt influence much. He sent us home without anything. So i dropped it off at a "friend of my dad's" shop and have him check it out tomorrow.

the question i have, does the MAP sensor have anything to do with the advance curve? And since no other sensors threw codes, whats left?
ExtrmZ is offline   Reply With Quote
Old 11-16-2009, 11:42 PM   #6  
dreamer1uk
3rd Gear Member
 
dreamer1uk's Avatar
 
Join Date: Feb 2008
Location: IL
Posts: 877
Default

Hi,

The MAP, TPS and ECT are the most important sensors for the ECU to determine injector pluse width on Speed Density vehicles.
You can test a MAP sensor pretty easily with a DVOM on the htz scale, while using a vacuum pump.
What the MAP sensor does, is measures manifold absolute pressure (as the name MAP implies). It effects the air/fuel ratio of the vehicle. So, yes, its a pretty big deal.

I cant see however, how this sensor would retard your timing. I can talk to one of my ASE professors at college on Wednesday (unless a Ford Tech. will chime in the thread before then) and ask him if he has seen any problems like your experiencing in the past. My shop manager is also an avid Mustang fan so i will poke him for some info too.
dreamer1uk is offline   Reply With Quote
Old 11-19-2009, 09:45 AM   #7  
ExtrmZ
4th Gear Member
Thread Starter
 
Join Date: Jan 2008
Location: Fargo, ND
Posts: 1,244
Default

yeah thatd be great

im stuck here. nothing makes sense
ExtrmZ is offline   Reply With Quote
Old 11-19-2009, 11:30 AM   #8  
CobraSnake
5th Gear Member
 
Join Date: Jan 2006
Location: Milwaukee, WI
Posts: 3,479
Default

dude your ****s retarded, get a new one.
CobraSnake is offline   Reply With Quote
Old 11-19-2009, 11:56 AM   #9  
ExtrmZ
4th Gear Member
Thread Starter
 
Join Date: Jan 2008
Location: Fargo, ND
Posts: 1,244
Default

i just bought a new truck for the winter (car's not the best on ice), '88 F-150. but i need to figure this out.
ExtrmZ is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Loud Noise Above 30 MPH bjdutch2005 2005-2014 Mustangs 10 03-24-2017 03:38 AM
Road trip to Sevierville/Pigeon Forge area folivier Tennessee Regional Chapter 4 10-02-2015 05:32 AM
Monte Carlo bar w/ AC fastbackford351 Classic Mustangs (Tech) 3 10-01-2015 12:24 PM
Best Extreme Performance Summer Tires for our Mustangs? M3hunter S197 Handling Section 0 09-05-2015 03:42 PM


Tags
1993, 23, 23l, 93, 96, cobra, ford, ignition, knock, mustang, retard, retards, sensor, timing, unhooking

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

All times are GMT -5. The time now is 01:58 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.