Inconsistent high idle - very strange - Help? - Page 3 - 3000GT/Stealth International Message Center

jcr5186 · 11-07-2009, 02:06 PM

It's crazy how you describe your problem is EXACTLY what my car does. Word for word.
Maybe I shouldn't waste my time/money with a new IAC.

Jon

napkinthief · 11-08-2009, 07:10 AM

Ive been having the same problem for almost 3 months.

I have vac leaks to help the idle go to 4k when i shift out of gear while braking.

2 used isc and a new isc later, still idle problem.

my ecu looks good maybe i should swap it.

frozenevolution · 11-08-2009, 02:33 PM

Quote:

Originally Posted by jcr5186

It's crazy how you describe your problem is EXACTLY what my car does. Word for word.
Maybe I shouldn't waste my time/money with a new IAC.

Jon

You can try it and see if it cures the problem, and if it doesn't just take it back. If you find a solution, or anyone knows or has a suggestion of what to do, please let me know because this is boggling me as to what the issue could be

frozenevolution · 11-11-2009, 11:25 PM

Just one more thought. I noticed when it does the low rev's start, like it'll try and idle around 400/500 and almost dies until you start driving. The thing I wondered was when it's around these low numbers, if I push the throttle, the response doesn't seem to be good at all, until you start driving. Could this hint towards a bad throttle position sensor or something along those lines? Thanks.

jcr5186 · 11-14-2009, 03:03 AM

I'm stumped. Anyone have any test we could try?

Jon

napkinthief · 11-14-2009, 04:28 PM

Well try this..

Next time you fire it up and its idling very low with low throttle response, floor it to 5k. When I did this, it seems to have cleared up whatever has holding it back and let it rev freely.

Im going to try a fix for this when I get my car running.

Schurmia · 11-15-2009, 02:00 AM

check the wiring from the ecu to the ISC. I had a pin that was making a bad connection and keeping the ISC from functioning.

frozenevolution · 11-16-2009, 02:35 AM

Quote:

Originally Posted by napkinthief

Well try this..

Next time you fire it up and its idling very low with low throttle response, floor it to 5k. When I did this, it seems to have cleared up whatever has holding it back and let it rev freely.

Im going to try a fix for this when I get my car running.

Hmm will try this next time it happens

Quote:

Originally Posted by Schurmia

check the wiring from the ecu to the ISC. I had a pin that was making a bad connection and keeping the ISC from functioning.

This very well could be the case. I'll have to check the wiring this weekend. I'll report and let everyone know. Did yours occasionally idle correctly vary rarely for short moments like Jon and Mine's problem?

EvanH · 11-16-2009, 02:48 AM

I had a very bad throttle searching going on not to long ago when it first started to be really cold in the mornings. Turned out I was very low on coolant for some reason. Other than I am fine with my coolant now(not running away), my idle issue disappeared. So, I will say check your coolant level, and also check your ecu coolant sensor.

Not the gauge sender and not the A/C switch.