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Old 01-18-2014, 03:11 PM   #1
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Default 97 bonneville engine help

97 Bonneville 3.8 natural. On cold start engine revs between 500 and 200 rpm repeatedly till it stalls out. no dtc showing. what should I be looking for ? also on code check it says EV not complete and Oh not complete. Any help would be appreciated. Thanks
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Old 01-18-2014, 04:38 PM   #2
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Sounds like your IAC(Idle Air Control valve) is sticking/closed too much. Maybe even bad.

Try cleaning the pintle with some carb/choke cleaner. I can't believe we don't have a thread on how to clean it. But we do have a thread on how to remove it...

https://www.gmforum.com/normal-maint...cement-284339/
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Old 01-18-2014, 06:53 PM   #3
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Thanks for the quick response. I will check that tomorrow
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Old 01-20-2014, 04:56 AM   #4
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Quote:
Originally Posted by Mike1995 View Post
Sounds like your IAC(Idle Air Control valve) is sticking/closed too much. Maybe even bad.

Try cleaning the pintle with some carb/choke cleaner. I can't believe we don't have a thread on how to clean it. But we do have a thread on how to remove it...

https://www.gmforum.com/normal-maint...cement-284339/
Mike I have done a few IAC cleaning posts of which I could find this one quickly.
https://www.gmforum.com/buick-172/in...avenue-304014/
I should do a proper one for mechanical sticky or something if u like...
Showing more steps like including where I use an old tooth brush etc in process and a more detailed step by step etc...
Would not take me long to add some more pretty pictures with tools being used in removal too, as I am due for another IAC cleaning maybe even next weekend... I can make it so.
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Old 01-20-2014, 05:44 AM   #5
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That would be fine Art. Just start the thread in the Gearhead section, and we'll work it from there.
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Old 01-20-2014, 06:29 AM   #6
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Acknowledged.
I will attempt to "shoot" for next weekend then.
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Old 02-05-2014, 02:46 PM   #7
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Mike I installed new the IAC motor . No changes. On cold start -25C engine still surges until I put it in drive then it stops. I put a diagnostic report in my photo album. Any help would be appreciated
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Old 02-05-2014, 04:22 PM   #8
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that is your readiness monitor status, doesnt really say anything about the engine.

did you clean the throttle body were it seats? surging can also be caused by a vacuum leak
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Old 02-05-2014, 08:13 PM   #9
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cleaned area well. If it were to be a vacuum leak would it not surge all the time? I understand they are readiness monitors but it has been like this for a year. I can't complete the drive cycle
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Old 02-05-2014, 08:49 PM   #10
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How about cleaning your MAF sensor? Grab a can of MAF sensor cleaner(right next to carb/choke cleaner) at Autozone and the like. Remove it from the TB, spray, reinstall and see what happens.

Are you able to scan for any codes?
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