NOW ITS MORE THAN A Bad Mis
11-06-2003, 10:12 PM
#1
Thread Starter
Join Date: Nov 2003
Location: Angola
Posts: 15
NOW ITS MORE THAN A Bad Mis
<IMG style="WIDTH: 32px; HEIGHT: 26px" height=26 src=smileys/smiley7.gif width=17 border="0"> I Have an 89 stang with a 347 stroker. And a C-4 automatic(Original 5 speed) The car idles fine but whenI am going down the road at normal speed it is missing. I push the gas a little and it sputters very bad, then all of a sudden it clears out and takes off untill I let off the gas and push it again. If i mash it to the floor it dosen't miss at all its outta hear as it should be! I have tested every senser on the car and they check out ok. I put a fuel filter on it a new fuel presurer reg on it . cleaned the throttle body. changed the idle air senser, the throttle position senser, o2 sencers, temp sencer. I made sure the breather hose for the gas tank wasn't mashed. I even un hooked the hose where the senser at the charcole can is still nothing. I checked the EGR valve, Replaced the EGR silenoid The only thing that I haven't done is change the fuel pump. I just looked at it to see if there was any trash in the pump or tank. If that dont work I guessI will try the computer.I HAVE 17000.00 INVESTED IN THE CAR AND WILL SELL IT FOR 8000.00( THANKS FOR ANY HELP OR SUGGESTIONS YOU CAN GIVE ME!!!!!!!)<FONT color=blue>[I</FONT>[i]<FONT color=blue> TOOK THE UPPER PART OF MY G-T 40 INTAKE OFF AND CLEANED IT. THE GASKET WAS LEAKING AND SOMEOF THE PORT HOLES WERE FULL OF RAW GAS. I CHECKED OHMSON THE INJECTORS. THEY READ 14.4 .I PUT NEW GASKETS ON THE UPPER INTAKE. I ALSO PUT A NEW FUEL PUMPTN THE TANK.WHEN I STARTED THE CAR THE CHECK ENGINE LIGHT CAME ON ! ? I DONT HAVE A TESTER FOR THE LIGHT AT MY FINGER TIPS, SO I DROVE DOWN THE ROAD TO SEE IF THERE WERE ANY CHANGES. WELL <IMG src=smileys/smiley19.gif border="0"> ITS STILL MISSING!!! (JUST MY LUCK) BUT NOW IF I MASH IT TO THE FLOOR IT SHUTS OFF AND FALLS FLAT ON ITS FACE LIKE THE CAR DIES FOR ABOUT 2 SECONDS . THEN ITS WIDE OPEN AGEAN FOR ABOUT 2 SECONDS AND SO ON. <IMG src=smileys/smiley5.gif border="0">(ALL I CAN SAY IS I ANTGOT A CLUE) CAN YOU HELP ?]</FONT> 
11-07-2003, 01:36 AM
#3
4th Gear Member
Join Date: Jun 2003
Location: B'ham, WA
Posts: 1,484
NOW ITS MORE THAN A Bad Mis
Please list all of your modifications - MAF, injectors, etc.
Sounds to me like your injectors are dumping a little bit too much fuel at low-moderate duty cycles. What psi is your fuel set to at idle with vacuum disconnected?
Sounds to me like your injectors are dumping a little bit too much fuel at low-moderate duty cycles. What psi is your fuel set to at idle with vacuum disconnected?
11-07-2003, 02:51 AM
#4
Thread Starter
Join Date: Nov 2003
Location: Angola
Posts: 15
NOW ITS MORE THAN A Bad Mis
psi is set at 38 to 40.It is a Holley regulator so it dont have a vacuum hose.</P>
Thanks for the help<IMG style="WIDTH: 30px; HEIGHT: 25px" height=30 src=smileys/smiley2.gif width=47 border="0"></P>
11-08-2003, 05:31 PM
#9
4th Gear Member
Join Date: Jun 2003
Location: B'ham, WA
Posts: 1,484
NOW ITS MORE THAN A Bad Mis
Some auto parts stores will read codes for free (autozone, pep boys, possibly others).
What happens if you unplug the MAF? It should go into limp mode or something, but if the MAF is bad (and you may just need to clean it) and you remove it from the equation the car should at least run and idle ok. I wouldn't recommend wailing on it in limp mode. Do you have access to another MAF (even if it's just a stock one) to test with?
You might try checking resistance of your plug wires (or do a visual check). I had one 1/2 melted through that was intermittantly grounding to my header (in the truck). I just noticed you replaced the wires, so maybe this isn't the problem. Did you use a good cap/rotor or a cheapie from Schuck's? When did the problem start? Before the major tune up stuff was done?
What happens if you unplug the MAF? It should go into limp mode or something, but if the MAF is bad (and you may just need to clean it) and you remove it from the equation the car should at least run and idle ok. I wouldn't recommend wailing on it in limp mode. Do you have access to another MAF (even if it's just a stock one) to test with?
You might try checking resistance of your plug wires (or do a visual check). I had one 1/2 melted through that was intermittantly grounding to my header (in the truck). I just noticed you replaced the wires, so maybe this isn't the problem. Did you use a good cap/rotor or a cheapie from Schuck's? When did the problem start? Before the major tune up stuff was done?
11-08-2003, 05:35 PM
#10
4th Gear Member
Join Date: Jun 2003
Location: B'ham, WA
Posts: 1,484
NOW ITS MORE THAN A Bad Mis
And you haven't answered my question about what all have you done to the motor.
Which MAF:
Size injectors:
Cam:
Heads:
Intake manifold:
Throttle Body:
To me it sounds like an electrical problem. If you've got a really good buddy who'll let you strip his Stang I recommend swapping out parts (coil, distributor, etc.) until you see something amiss.
Which MAF:
Size injectors:
Cam:
Heads:
Intake manifold:
Throttle Body:
To me it sounds like an electrical problem. If you've got a really good buddy who'll let you strip his Stang I recommend swapping out parts (coil, distributor, etc.) until you see something amiss.