Rough running at low rpms

crazyhorse95 · Apr 4, 2005

Hey guys - I've got a 95GT, stock - having some problems with it running rough - not at idle but just above that, like between 1000-1300 rpms and then smooths back out. If I hold it at 1000 the wife likes it but I'm thinking it may be something going out. Any ideas?

black945.0 · Apr 4, 2005

when is the last time u did a tune up fuel filter air filter cap rotor plugs and wires just the basics then if it still does it i would try to find a miss or somthing of the sorts

95CobraMike · Apr 4, 2005

i would start by.....
cleaning your airfilter, MAF and replacing your PCV Valve....

black945.0 · Apr 4, 2005

i would check the pcv first but i dont c how the would only give a rough feeling between those rpms but cleaning the maf is a good idea as well alot of times the get coated and can throw off true readings for the pcm

95CobraMike · Apr 4, 2005

i know sometimes my pcv pops out of the intake hole and i get a rough idle under 1000...i would definatly start there...pcv is located on the back side of the lower intake manifold...has a vacuum line attached

DarkMesa8 · Apr 4, 2005

Hit the ACT (air charge tempterature) sensor while you're in there. Its really easy to get to.

black945.0 · Apr 4, 2005

try to clean the throttle blade too it could get gunked up with deposits and cause a slight rough idle

crazyhorse95 · Apr 4, 2005

thanks

Thanks guys - I guess it is about that time. I've done the MAF and PCV but it was probably about 50,000 miles ago. I'll add those to the wires and plugs I've got ready to go in.

Is the air charge sensor hooked to the MAF?

Chythar · Apr 5, 2005

If all else fails, definitely check for a vacuum leak. I just found one this weekend by accident, when I broke the tiny one that feeds the vent system. With it discunnected, the engine idled the same way it's idled the last few months - a bit rough. After patching the hose, my idle finally smoothed out. Purrs like a kitten now.

CManT1914 · Apr 5, 2005

The IAT (Intake Air Temperature sensor) is threaded into the intake piping, just behind the MAF. The IAC (Intake Air Charge sensor) is the larger black module on the throttle body (not to be confused with the smaller module, which is the TPS). Clean and check ALL your sensors (MAF, IAT, ECT etc.) and your PCV valve, plugs, wires, cap, rotor, check your timing, fuel filter etc.

DarkMesa8 · Apr 5, 2005

CManT1914 said:
The IAT (Intake Air Temperature sensor) is threaded into the intake piping, just behind the MAF. The IAC (Intake Air Charge sensor) is the larger black module on the throttle body (not to be confused with the smaller module, which is the TPS). Clean and check ALL your sensors (MAF, IAT, ECT etc.) and your PCV valve, plugs, wires, cap, rotor, check your timing, fuel filter etc.

I'm pretty sure the IAC stands for Idle Air Control and its a valve, not a sensor. Regardless, it can cause problems (probably not your problems though, its main function is when the throttle is closed) so it should be cleaned out, carb cleaner is good for that.

CManT1914 · Apr 5, 2005

DarkMesa8 said:
I'm pretty sure the IAC stands for Idle Air Control and its a valve, not a sensor. Regardless, it can cause problems (probably not your problems though, its main function is when the throttle is closed) so it should be cleaned out, carb cleaner is good for that.

Dammit, I was hoping nobody would notice that and correct me, lol. I was to lazy to correct it myself.

DarkMesa8 · Apr 5, 2005

CManT1914 said:
Dammit, I was hoping nobody would notice that and correct me, lol. I was to lazy to correct it myself.

If they had an "edit" count under my avatar, I'd have more edits than posts. Hell I even had to edit the reply I made to your IAC post!

Rough running at low rpms

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