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| Can I manually manipulate my idle speed? (Page 3/10) |
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Patrick
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APR 16, 11:14 PM
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| quote | Originally posted by Kitskaboodle:
Anyways, here’s a pic to show you my engine.
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Well, I can see the problem quite easily now... your engine is just too damn clean. 
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Kitskaboodle
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APR 17, 10:12 PM
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Update: Since new sensors are quite cheap (about $20-22 + free shipping for the Delphi brand) I decided to just go ahead and replace them both. (coolant sensor and IAT sensor) I did this also for peace of mind.
Anyways, after installing them I started the engine (sitting all night) and the engine went right to about 2500 rpm. (300 less than before) It stayed at 2500 for about 4 + minutes. After the engine was fully warm, the idle went down to about 1400 rpm. After driving it for about 10 minutes around the block and then letting it idle for another 5 minutes, it eventually went down to about 1250-1300 rpm.
It looks like for now I’m just going to have to live with it. 🙁 Can we now talk about the IAC? I’m almost certain I replaced mine about 10-12K miles ago. (I think it was Standard brand) As I recall, when I installed it the idle was crazy high.I posted a thread here and a fellow member told me the sequence of how to “re-set” it. He was exactly correct! After I did the sequence, the idle went down to normal.
How do I verify the IAC that it’s working properly?
Kit[This message has been edited by Kitskaboodle (edited 04-17-2025).]
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Vintage-Nut
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APR 17, 11:11 PM
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How can you test the IAC by MordacP
https://www.fiero.nl/forum/...110502-2-093097.html
| quote | Chicken McNizzle:
The following is based of course on a clean idle air passage as well as a butterfly that has never been tampered with....
1. Key on Engine off, place jumper wire into ALDL to put vehicle into diagnostic mode ( to check codes )
2. Go to engine bay, you will hear stepper motor moving in the IAC, remove IAC connector. At this point the IAC will be fully closed therby blocking the IAC passage and the car should not start
3a. IF CAR STARTS - Attempt to start car - if car starts and runs then there is a vacuum leak and/or tampered throttlebody and the butterfly will have to be reset.
3b. IF NO START - Attempt to start the car - If the vehicle does not start then the IAC is functioning
4. Reconnect IAC connector and remove jumper wire from ALDL and start car, there will be fluctuations in starting and even hesitation, and in some cases no start as the IAC resets itself.
This test confirms:
- That the IAC is functioning
- test for vacuum leaks
- test for a tampered throttle body
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82-T/A [At Work]
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APR 18, 10:01 AM
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| quote | Originally posted by Kitskaboodle:
Oops…I stand corrected again. 🙁 (I told you guys I’m getting old - or as George Burns once said, “you’re only as old as the girls you feel” 😀)
Yes, the throttle body is not powder coated! 😀
Anyways, here’s a pic to show you my engine. You can barely make it out but if you look hard you can see that the plug is there on the throttle body. Kit |
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Speaking of OLD and throttle bodies... I remember having a conversation (EDIT, back in 1997) with some people on a car forum on UseNet via a BBS, and I was telling them that the Fiero's V6 throttle body was made by Holley. They swore up and down that either someone replaced it with an aftermarket one, or that I was lying through my teeth... saying Holley would never make a factory part for a lowly car like the Fiero. Alas, there was almost no internet back then, no normal person had a digital camera, I had no scanner or Polaroid, and there was no way to upload images to the message board, other than via Zmodem or Xmodem or something, but couldn't attach them to a message. So I just had to take it.  [This message has been edited by 82-T/A [At Work] (edited 04-18-2025).]
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Kitskaboodle
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APR 19, 09:23 PM
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Ok, since a quality IAC is only $38.00 from Amazon, I decided to just buy a new one and I’ll keep the old one as a spare. See pic below of the new one.
On a different note….. how exactly do you “reset” a Fiero IAC? One thing is almost certain: after I put the new one on, the rpm’s are going to be very high and I will need to bring it down asap. By the way, there is a paper instruction thingie with the new IAC and it said that for Pontiac’s, the IAC will reset itself after you drive over 40 mph. Is that correct?? Kit [This message has been edited by Kitskaboodle (edited 04-19-2025).]
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Kitskaboodle
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APR 19, 09:27 PM
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Ok, since a quality IAC is only $38.00 from Amaz, I decided to just buy a new one and I’ll keep the old one as a spare. See pic below of the new one.
On a different note….. how exactly do you “reset” a Fiero IAC? One thing is almost for certain: after I put the new one on, the rpm’s are going to be very high and I will need to bring it down asap. By the way, there is a paper instruction thingie with the new IAC and it said for Pontiac’s, the IAC will reset itself after you drive over 40 mph. Is that correct?? Kit
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Vintage-Nut
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APR 19, 09:35 PM
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| quote | | there is a paper instruction thingie with the new IAC and it said that for Pontiac’s, the IAC will reset itself after you drive over 40 mph. Is that correct?? |
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YES, but you need to check if it needs to be set properly before installing it...
PS - I added more IAC information...
http://www.calgaryfieros.com/OSGdocs/IAC.html
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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles[This message has been edited by Vintage-Nut (edited 04-19-2025).]
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Kitskaboodle
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APR 19, 11:12 PM
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Thanks again for the reminder about setting pintle length.
I measured the new one and it is pretty close to 1 and 1/16th so I’m under the magic 1 and 1/8ths.😊 So, I’m going to install it as-is. Lastly, I read all the threads that pertain to iac resetting so I got it down now. I will report back tomorrow and let you all know if my high idle (when cold) lowers any from what is is now. (2450-2500 when I first start it - it will fast idle like this for at least 4 minutes) 🙁 Kit[This message has been edited by Kitskaboodle (edited 04-19-2025).]
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Backroadgee
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APR 20, 03:39 AM
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High idle could most likely be a vacuum leak or a defective sensor or IAC valve.
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Kitskaboodle
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APR 20, 01:59 PM
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I’ve looked high and low for vacuum leaks and can’t find any. Per a suggestion above, I did verify that after blocking off the throttle body suddenly with a piece of flat wood, the engine immediately died. Since beginning this thread (and per the recommendations above, I have now replaced the coolant sensor, IAT sensor and today I will be replacing the IAC. I will report back later today.
Thanks again for all the input. 😊 Kit[This message has been edited by Kitskaboodle (edited 04-20-2025).]
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