Inconsistent idle; rising RPMs.

jbeaton9292 · Feb 5, 2014

So all of a sudden my car keeps reving all on its own everytime i hit the clutch and it is also doing it to where it is holding speed when i let off gas and it just holds consistant and doesnt smooth out or anything :banghead:

92AWDHX40 · Feb 5, 2014

That's odd I never heard related to that.

2g spyder eclipse · Feb 5, 2014

check the iac and check the throttle cables.

spyderdrifter · Feb 5, 2014

In addition to your throttle cable, check the pedal too for sticking, and the return spring.

jayson427 · Feb 5, 2014

Do you have cruise control? Check where the cable goes out the firewall it can get hung up around there. Go over the whole cable and pull on it to see if it hangs up. Throttle body could be sticking too.

jbeaton9292 · Feb 5, 2014

I have no cruise and the throttle cables was just replaced with noncruise cable and i guess it could be the tb or pedel or something ill check over them

Marks-2gdsm · Feb 5, 2014

If you just replaced the cable it's probably set to tight.

DogWhistle · Feb 5, 2014

Had a similar experience on another vehicle a few years ago. Turned out to be a hairline crack in the intake manifold.

Check your throttlebody gasket, mating to the intake manifold. Very small intake leaks after the TB can cause this. Also check for hairline cracks on the IM, and the IM gasket to the head.

Quickest way to do all of the above is a boost leak test.

jbeaton9292 · Feb 5, 2014

Marks-2gdsm said:
If you just replaced the cable it's probably set to tight.

I adjusted it to make it right i suppose it could have moved maybe ### it was doing it every once in a great while and thaught maybe fiav but now its always doing it

Supra Mario · Feb 5, 2014

Maybe check your throttle plate closing completely and or just not sealing. Mine let air go past causing similar issues.

JMAR · Feb 6, 2014

I'd check the throttle cables also your pedals

Sorry just remembered you can lower your rpm idle from adjusting the screw on your throttle body.. its on the front side and looks like a hollow hole but if you look at it.. it has a phillips head tip so by turning it you can adjust idle..

spyderdrifter · Feb 6, 2014

Whenever I remove my throttle cable and reinstall it, I route it as normal and hook it to the TB and get the bolts screwed into the IM. Then I open the throttle plate and let it snap shut under its spring force, then adjust the cable so that it's not sagging and tighten the bolts down on the mount plate. Never had issues since doing it that way. Throwing it out there as an idea.

curt-s · Feb 6, 2014

You obviously have too much air going into the system on what should be idle. So force the issue with a BLT and see where it leaks out. Check your idle position switch height. Ensure TB is fully closed at idle.

Does it surge when in neutral and the clutch not depressed (ie. engaged)?

There should be no difference between clutch in and clutch out; one will not magically make the engine free rev above the other. In fact, clutch in might *lower* RPMs because of load, if anything at all.

jbeaton9292 · Feb 6, 2014

sordid said:
You obviously have too much air going into the system on what should be idle. So force the issue with a BLT and see where it leaks out. Check your idle position switch height. Ensure TB is fully closed at idle.

Does it surge when in neutral and the clutch not depressed (ie. engaged)?

There should be no difference between clutch in and clutch out; one will not magically make the engine free rev above the other. In fact, clutch in might *lower* RPMs because of load, if anything at all.

No surge im picking up a smim tonight with a q45 tb and throwing that on and ill see if problem continues

805LegendDSM · Feb 6, 2014

It could possibly be a vacuum leak...or your cables are somehow getting stuck for some reason no way to really tell...but you should definitely looking leaks and possibly your TB not closing all the way..

jbeaton9292 · Feb 6, 2014

805LegendDSM said:
It could possibly be a vacuum leak...or your cables are somehow getting stuck for some reason no way to really tell...but you should definitely looking leaks and possibly your TB not closing all the way..

Im guessing that i have rtv stopping up the plate my brother did the tb on it when we put the car back together so idk how crazy he went with the rtv

805LegendDSM · Feb 6, 2014

jbeaton9292 said:
Im guessing that i have rtv stopping up the plate my brother did the tb on it when we put the car back together so idk how crazy he went with the rtv

That could be it, re-check and go from there brother.

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Inconsistent idle; rising RPMs.

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Marks-2gdsm

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