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 Post subject: Engine Surging
PostPosted: Thu Jun 20, 2019 9:46 am 
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Joined: Sat Nov 14, 2015 4:47 pm
Posts: 23
Year and Trim: 1994 Bonneville SE
1994 Bonneville SE

Several months ago the engine would surge upwards of 3000 RPM on startup and stay there. I pressed the accelerator several times to see if maybe it was stuck, but surge continued. Turned engine off, cleaned the throttle body with carb cleaner and seemed to fix the problem.

Yesterday, drove home from work. Stopped off at a store and returned to the car. Started it up and it surged to ~3000 RPM and did not drop. Managed to drive it the 1 mile home while holding the brakes.

Got home, turned the engine off then on again and no surge.
Any ideas? Another throttle body cleaning? TPS?


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 Post subject: Re: Engine Surging
PostPosted: Thu Jun 20, 2019 1:36 pm 
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Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1729
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
you can first make sure the throttle plate closes properly.

really should get it scanned for codes and make sure tps is proper

is the ses light on?

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


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 Post subject: Re: Engine Surging
PostPosted: Thu Jun 20, 2019 3:18 pm 
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Joined: Sat Nov 14, 2015 4:47 pm
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Year and Trim: 1994 Bonneville SE
SES light is not on.


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 Post subject: Re: Engine Surging
PostPosted: Thu Jun 20, 2019 9:15 pm 
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Joined: Wed Feb 23, 2011 8:47 pm
Posts: 164
Location: Fort Madison Iowa
Year and Trim: White 1994 Pontiac Bonneville SE, 3800 Series 1.
Replace IAC sensor or MAF. If i had to guess it's going to be the Idle air control

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1994 Bonneville SE - Series one. L27
1998 Bonneville SE - Series Two. L36
2001 Bonneville SSEI - Series Two. L67


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 Post subject: Re: Engine Surging
PostPosted: Sat Jun 22, 2019 5:20 am 
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Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1729
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
Evan0801 wrote:
Replace IAC sensor or MAF. If i had to guess it's going to be the Idle air control


try cleaning it first _ may get lucky

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


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