On every cold start, I've noticed two things:

1) The car never idles above 1100-1150 RPM. Most cars I've owned idle much higher for the first two minutes. Not my tib.

2) If I give it a little bit of gas, and bring the rpms to around 1500, the car tachometer fluctuates. i.e. engine speed varies. It drops 100 rpms and then comes back up and then drops again and so on. All while keeping the gas pedal constant.

This only happens when the engine is cold. During normal driving, I cannot recreate this.

Any idea/ explaination why?

 

1) Stock mine used to idle 1400rpm... however in the process of mods my car now idles where you are at, 1200rpm.

2) Sounds TPSish to me. Kind of like a problem I have on my car (started occuring after TB/IM install). If I let it idle for three minutes, the RPMs during shifts drop fast (really fast... stock shifting can't keep up hardly on the higher gears) and turning on the A/C causes it to barely idle if its turned on. If I don't let it warm up, the rpms drop super slow during shifts but the A/C works. lmao.gif However my problem occurs on hot and cold starts.

All in all, your problems aren't bad, just lil annoying things that pop up. The Tib has its querks but nothing serious, I'll settle for some cold start idle issues over blowing up expensive things like other cars anyday.

 

Fair enough! Not to mention, the car has 123K miles on it.

I am wondering if a sensor needs replacing or if I have a compression leak or something that needs attending to?

Perhaps this is something else that better grounding can help fix?

 

You ever replaced the TPS?

 

^^^^i agree, sounds like he ecm isn't gettng a steady reading from the TPS . just my 2cents

 

Nope. But Im the 3rd owner.

Its a Keifco sensor I believe

 

i'd get a multimeter and check it out, see what it reads
dealer told me mine was fine, checked it myself when i got home, wayyyy out of spec..idiots

 

I think when you constantly press gas pedal, ECM want to lower RPM and close Idle Speed Actuator, then when it's alike almost close RPD drops and ECM starts to open Idle Speed Actuator.

If engine do not die, than lower idle in winter should be ok. Don't worry about it.

 

that's really weird, because i'm having the same problem right now. it's only happened a few times, but it gets low enough that it seems like the cars going to stall. so i give it some gas and it's gone...

but i'm having a few other problems, like i know i have to replace the spark plugs, and i think i need to replace my catalytic converter....

 

The car does not come close to dying. It just worried me that the car doesn't try to heat itself up in sub zero temperatures.