llesg

Hey everybody, Its been a while since i've been here.
Had a blown head gasket and have finally got my car back together.
It was like the second one in about 3 months!!
Had a bad drain valve on the radiator.
Driving on the freeway and all of a sudden the temp shot up.I got to the side and shut it off but too late,**** me!!!
It would not start after reassembly. Had fuel,had spark,had no compression.
I had adjusted the valves too tight!!
So readjusted them and reassembled.
So now it runs but the idle is about 1850.
I let it warm up and it stays around 215 on the digital oil temp gauge.
The idle does not come down
service engine light on and service asr or abs light on.
I have the FSM but I have a hard time finding anything in them,especially when I'm hot and pissed off!!!
I need a book just to figure out how to use them!!!
Anyway looking for some help and advice
Thanks,Rick

94VenomVette

what was it idling around before? Have you checked the TPS and IAC and vac lines just to rule it out.

llesg

before idle was around 600
TPS is almost new
IAC , No, not sure how to check.
I guess I'll spent the night trying to find out in the book.
Visual check on vacuum lines looks good.

94VenomVette

Iac is idle air controller, it's on the throttle body.

llesg

This car is really giving me a good time!!!
So looks like a lot of the wires got cooked along the passenger side manifold.most of them were melted together,but they came apart when I pulled them,fixed some broken wires to the TPS. I thought that was the problem with the idle.Still idles high 1400.
Now this is weird to me, if I rev it up the speedo will randomly go up to 7 miles an hour!!WTF??? so It starts right up,idles high. while running I disconnected TPS,IAC,MAS, and the other one on the intake boot.
No change in how it runs
Any help appreciated

antfarmer2

Clean IAC and find any vacumm leaks.

llesg

I did spray either all around the manifold and hoses , no difference.
I did clean the IAC even though it looked clean.
I think there was some type of reset but I don't remember, it's been a while since I did that

antfarmer2

Stop trying to blow up your car. Blow smoke in the brake booster hose.

rorrapalooza

Im not sure about 94, but for 84, if you drive to 40 mph the IACs reset. I was trying to figure out why mine was idling at 1500. Tried this, and it dropped to 600. Give your shop manual a read, specifically in the throttlebody section before you try anything

aklim

Don't know about a 94 specifically but I'd take the TB apart and clean it first. Take the plate at the top off, take the IAC out, take the IAC housing off and clean the TB and all the IAC passages and the housing. Obviously new gaskets. Reassemble. Check the IAC counts with a scanner and NOT a code reader. See if you get about 20-30 counts with everything but the motor off when it is at operating temp. If you don't, turn the adjustment screw at the TB out, rev and recheck. If you turn it out all the way and still cannot get the target counts, you have a leak. If you can, you have just reset it.

llesg

Thanks, I'll give it a go!!
I kinda like the idea of blowing smoke into my brake booster!
What kind of smoke should I use?????
I will have to look into The IAC counts,not familiar with that, but I'm guessing I will be.
Thanks!!!!!!

antfarmer2

Not into the brake booster the hose from it to the engine. Just pull the line off the booster and put your thumb over it to see if the booster is leaking. If not get a cheap cigar and blow the smoke to the engine to find the leak.

Red88Vert

Service your cruise control cable junction. That ended up being my source of high idle after I worked through everything else others have mentioned. You need to lube it and follow the retorque sequence.

llesg

was looking for throttle body gaskets and found them to be allot of money for 3 little gaskets. so going to make them and i'll let you know what happens

aklim

BBK 1584 is 13 bucks and the IAC gasket is cheap. What is your idea of a lot of money?

Red88Vert

I think I bought the set from Rock Auto for $9. Similar prices at Autozone but I had to order other stuff too.

aklim

Shouldn't be more than 20 dollars when you get the IAC gasket. I'm curious how much they quoted him

94c4er

I had a similar idle problem a while back and I removed the IAC and cleaned it and the intake location and after putting it together the itle was back to normal.

aklim

Always check for "normal" with a scanner. Otherwise it might be "normal" as in the ECM has been able to maintain the command idle but with more adjustment than it should. So if the idle is maintained at 80 counts, it will throw no codes and look normal to you but that means your adjustment window is smaller. So someday if it really needs to open it up, it won't open more than max which gives you an intermittent idle issue.

DGXR

There is a process for resetting the IAC valve. A quick search produced these:

https://www.corvetteforum.com/forums...re-please.html
https://www.corvetteforum.com/forums...alve-then.html
https://www.corvetteforum.com/forums...procedure.html
https://www.corvetteforum.com/forums...e-setting.html