Idle problems

[icsmike]

1995 1.5
A/T
220,000 mi
Recent TB/WP and tune-up.
New fuel pump


Hey fellas, this problem has been going on for a while and even after all the new parts re-timing, swapped out a MAF, swapped out a complete dizzy, and fuel pump.

When it starts cold the idle goes up pretty high (guessing 2000-2500) and after about 30 secs. it starts to surge up and down like revvv-buh-revvvv-buh-revvvv-buh-revvv-buh. heheh sorry about the description.

Once it warms up ot stops the idle hunting/surging and just idles a bit high.
I checked the intake boot and vacuum. maybe EGR? IAC valve??

Thanks a bunch!!!!!!

[vapor]

1997 1.6
A/T
130,000 kms.

I've been having the same problem too. When I start the car cold, idle goes up to about 1500 and stays there for a few seconds...then drops to about 1000 rpm...when i switch on the aircon...it drops suddenly to about 6-700 rpm and the car starts to shake. Once its fully warmed up though the shaking stops and idle is steady at about 7-800rpm. Could it be the A/C idle up? or the Servo?

Thanks,

[RicardoS]

Idle air control valve

Not exactly sure how mine failed but I think it's the idle air control valve. I've replaced all the above mentioned (a few times between two motors) and have heard of it before and went the other direction ($). Turns out this part is like 260 at their cheapest and over 400 on average. I almost brought my ride to the shop until I pulled the iac valve and cleaned off deb re and re-installed. seemed to be the only thing I've done (everything) that made a difference in idle, it is still jumps from high rpms to almost dying. Before this problem was minor but ever since I put in a new used motor it doesn't work. Haven't made the nasty purchase yet but will keep you posted.

(This is the reason I sought out the forum in the first place so I have scoured for years, could finally be the answer)

Some how for the longest time I thought the iac was in the air intake just past the maf!!!!!!!!! Man................

[Beerizfood]

Double check the base idle and timing first.Be sure to put the car in base mode first before making adjustments.