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PostPosted: Thu Aug 10, 2017 12:47 pm 
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Joined: Fri Apr 27, 2012 6:51 am
Posts: 36
Year and Trim: Looking at a 2000 SSEI with 124,000
This is my wife's DD.

She was driving it Sunday and no problem.

Tried to start it up on Monday and it won't run.

Engine cranks but will not start unless I press the accelerator.

When I lift my foot of the accelerator it stumbles and stops running.

There is no service engine light and the car has not set any codes.

The plugs and wires are new within the last 12 months, new ICM within the last 3 months. Just changed out the ICM today (it was under warranty) because I felt the symptoms were similar to the problem I had earlier this year that required I replace the ICM.

A/C Delco fuel pump replaced within the last 12 months.

Supercharger rebuilt within the last 3 years.

At a loss of where to check next.

Need some help to get this car back on the road again.

Thanks in advance.

- Bret


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PostPosted: Thu Aug 10, 2017 1:14 pm 
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Joined: Mon May 19, 2008 6:04 pm
Posts: 25510
Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
Unplug the MAF sensor.

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2004 Bonneville GXP | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
2014 Town & Country Limited | Cashmere Pearl | 52k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 230k | Official Bonneville Hauler


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PostPosted: Thu Aug 10, 2017 2:04 pm 
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Posts like a Northstar
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Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1813
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
x2 on unplug the Maf - and if it indeed solves the issue, you can try cleaning the maf wires.

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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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PostPosted: Thu Aug 10, 2017 5:37 pm 
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SLE Member
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Joined: Fri Apr 27, 2012 6:51 am
Posts: 36
Year and Trim: Looking at a 2000 SSEI with 124,000
Unplugged the MAF and no effect.

Any other ideas?

I noticed that the boost on the supercharger wasn't very high at 2000 rpm.

Removed the supercharger belt and no change.

Unless I keep my foot on the accelerator and keep the rpm >750 the engine dies.

I have new vacuum hose to the T under the snout of the supercharger.

Could the fuel pump have failed? It is a new within the last 6-9 months AC Delco.

Thanks for your help so far.


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PostPosted: Thu Aug 10, 2017 5:53 pm 
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Joined: Fri Apr 27, 2012 6:51 am
Posts: 36
Year and Trim: Looking at a 2000 SSEI with 124,000
How can you test the IAC?

From other posts I've seen in the past few minutes, the symptoms my car is having are similar to another guy who had a bad IAC.

Any way to test that?


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PostPosted: Thu Aug 10, 2017 8:49 pm 
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Joined: Fri Apr 20, 2012 8:19 am
Posts: 57
Year and Trim: 2002 sle
Try cleaning throttle plate and bore.


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PostPosted: Fri Aug 11, 2017 9:00 am 
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Joined: Mon May 19, 2008 6:04 pm
Posts: 25510
Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
I'm gonna say vacuum leak now. Since you were messing with the lines when you did the new T under the snout, maybe you bumped and cracked a fitting?

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2004 Bonneville GXP | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
2014 Town & Country Limited | Cashmere Pearl | 52k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 230k | Official Bonneville Hauler


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PostPosted: Fri Aug 11, 2017 3:10 pm 
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Joined: Fri Apr 27, 2012 6:51 am
Posts: 36
Year and Trim: Looking at a 2000 SSEI with 124,000
It was the IAC.

When I removed it, the plunger was extended all the way. :banana: :bwoohoo:

Put the new one in and the car ran like it should.

Thanks for your help everybody!

- Bret


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