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PostPosted: Thu Sep 21, 2017 1:15 pm 
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Joined: Thu Aug 10, 2017 12:55 pm
Posts: 8
Year and Trim: 1990 Bonneville Le
I have replaced the icm,tps,crank sensor( hope is in right watched a lot of videos) also replaced cam sensor and wiring harness that goes to all of those. Tach does not work. Car will run at a higher rpm but will not idle. Please help anyone.


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PostPosted: Thu Sep 21, 2017 2:03 pm 
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Joined: Mon May 19, 2008 7:01 pm
Posts: 16634
Location: Central Illinois
Year and Trim: 1992 SSE
2009 G8 GT
Try unplugging the MAF and see if the behavior changes.

Are there any other symptoms, trouble codes, sounds, etc?

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WHITE WHINE - IT'S INTOXICATING. 1992 SSE Supercharged 236.26 ci (.040 Over)
15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Easy Performance Gen 3 Air/Fuel Calibrator, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers and 10" Subs, 1300 watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, McCoy Motorsports Ceramic Coated Ported Exhaust Manifolds, Fan Override, PowerSlot Slotted Rotors.
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim Trailblazer mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser


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PostPosted: Sat Sep 23, 2017 10:06 am 
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4265
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
A few other things that could cause poor idle are EGR stuck open and vacuum leaks.

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I don't know how much boost it takes to blow the tires off. But I know how much I'm going to use!
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Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, racecar! Build thread
'97 Chevy Camaro - 3800, T5, T-tops, my DD
'05 Cadillac STS - V8, AWD, her DD
'89 Buick LeSabre Limited - winter DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 project
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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PostPosted: Sat Sep 23, 2017 10:14 pm 
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Posts like an L67
Posts like an L67

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1329
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
YES, UNPLUG THE MAF SENSOR AND SEE IF IT IMPROVES. then you can check the IAC IDLE AIR CONTROL. if that fails, it would cause your issue.

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2000 SSEi
past rides:
1996 SSEi
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1987 Grand Am


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PostPosted: Sun Oct 15, 2017 11:26 am 
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Joined: Sat Mar 21, 2015 6:50 am
Posts: 34
Year and Trim: 1990 Bonneville SSE
I had this same issue on my '90 bonnie and it was the iac.


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