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Old 10-11-2013, 01:28 PM   #1
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Runs best when its cold

After a few months if trying to figure out my car's problem, I've narrowed it down to a few things.

It starts up cold no problem, but it sounds like it doesn't want to start when it's warmed up. Then it idles like crap and sometimes doesn't run smooth until I step on the gas a bit. Also the voltage is buggy when it's running already warmed up. I'm thinking its ignition coil time? Also could the tps have anything to do with it?

Edit: 1995 3.4L v6
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Old 10-11-2013, 02:26 PM   #2
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I would suspect the ignition control module ( ICM ) more that the TPS.
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Old 10-11-2013, 03:08 PM   #3
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Quote:
Originally Posted by NavyVet View Post
I would suspect the ignition control module ( ICM ) more that the TPS.
Ok what about the coils? Still an issue?
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Old 10-11-2013, 04:13 PM   #4
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Quote:
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Ok what about the coils? Still an issue?
Is it turning on the SES light.
Coils would cause more of a steady rythmic miss fire.
ICM will be more random.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 191k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
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Old 10-11-2013, 04:37 PM   #5
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Quote:
Originally Posted by NavyVet View Post

Is it turning on the SES light.
Coils would cause more of a steady rythmic miss fire.
ICM will be more random.
Yea there's an intermittent SES light. The last code it was throwing was for a clog in the EGR system but I cleaned it
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Old 10-11-2013, 04:41 PM   #6
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ICM or coils, or both.

Have you checked for a misfire code?
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 191k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
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Old 10-11-2013, 04:59 PM   #7
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Quote:
Originally Posted by NavyVet View Post
ICM or coils, or both.

Have you checked for a misfire code?
No and Idk if I can at work. I'll find out tomorrow when I go in
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Old 10-11-2013, 06:58 PM   #8
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Navy vet is right about the ignition module. It's either in need of replacing or there's a heavy build up of corrosion on it causing a loss in ground to the module. You can test each one of your coils with a multi meter set to ohms. Each coil should be around 5.000 when testing resistance. Put the positive lead from the meter on one plug wire pole and the negative on the other for your reading they shouldn't be lower than 4.500. You might also want to check the vacuum line leading to your fuel pressure regulator. Take the line off the regulator and check to make sure there isn't any fuel coming out of the regulator and also check the condition of the line itself for any loss of vacuum. A vacuum leak will generate an EGR error code so check for any vacuum leaks as well. If the car is OBD II, you'll generally get a lean code, but not always.
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Old 10-11-2013, 07:09 PM   #9
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I've been meaning to check for a vacuum leak for a while, so now is the time I guess. Anyone know where the fuel pressure regulator is?
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Old 10-11-2013, 10:19 PM   #10
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Quote:
Originally Posted by purple94 View Post
I've been meaning to check for a vacuum leak for a while, so now is the time I guess. Anyone know where the fuel pressure regulator is?
Where the fuel lines connect to the fuel rail.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 191k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
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Old 10-12-2013, 12:19 AM   #11
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alright thanks guys, i'll hopefully be checking these things tomorrow
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Old 10-23-2013, 07:05 PM   #12
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Ok didn't do this stuff except i did check a breather or vacuum line or something under the hood, it was halfway off the fitting but I felt no difference in the car. Now today the coil stopped working. I am replacing one for now, hopefully this weekend I get paid. Do you guys think I should replace the spark plugs in the misfiring/not firing cylinders? They're a year old.
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Old 10-23-2013, 07:23 PM   #13
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Plugs should be fine if they're only a year old.
The coil could be the reason it didn't run good when warmed up.
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96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 191k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
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