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PostPosted: Mon May 15, 2023 11:34 am 
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Location: Ira, MI
Year and Trim: 2001 Bonneville
Hello,

2001 Bonneville SE.

At 112K miles I had the trans rebuilt.

I'm at 214K miles now and I feel it slipping when I'm in high gear when I want to accelerate.

Nothing from a standstill.....only in high when, for example entering freeway...cruise set and creeping up a hill etc.

I just put 3 new coils and an ignition control module in thinking it was a miss-fire.

Is there anything I can do other than a full teardown?


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PostPosted: Tue May 16, 2023 6:18 am 
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Location: Chicago, IL
Year and Trim: 2003 SLE
Is it slipping or do you have erratic RPMs going up and down and bucking a little bit?

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"Penelope" - 2003 SLE - 247k Miles
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PostPosted: Tue May 16, 2023 8:35 am 
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Location: Ira, MI
Year and Trim: 2001 Bonneville
I guess more like bucking.....


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PostPosted: Wed May 17, 2023 8:29 am 
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Location: Ira, MI
Year and Trim: 2001 Bonneville
nos4blood70 wrote:
Is it slipping or do you have erratic RPMs going up and down and bucking a little bit?


So yes..it's bucking and the RPM's are erratic.

What are your thoughts?

Thanks


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PostPosted: Wed May 17, 2023 9:24 am 
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
99% of the time, your symptoms are ignition issues under load. I know you've replaced the coil and ICM already. Do you have a way to watch live data with a scan-tool to determine which cylinder is misfiring? It wouldn't hurt to change the plugs and wires also.

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PostPosted: Wed May 17, 2023 11:01 am 
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Location: Chicago, IL
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I would change plugs and wires as stated above. I've also had a dirty MAF cause similar situations.

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"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles
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PostPosted: Wed May 17, 2023 2:04 pm 
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Location: Ira, MI
Year and Trim: 2001 Bonneville
Regarding dirty MAF......I assume there is a special cleaner for this.

Can I spray it on the vehicle or do I need to remove it?

Thanks


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PostPosted: Wed May 17, 2023 2:18 pm 
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Year and Trim: 2003 SSEi
Yes, there is a special MAF cleaner and, yes, it's kinda pricey. I think it might be easier to clean with the MAF removed.

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PostPosted: Thu May 25, 2023 9:44 pm 
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Location: Chicago, IL
Year and Trim: 2003 SLE
You can get the MAF cleaner at any auto parts store. Remove the MAF and spray it down.

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"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles
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PostPosted: Tue May 30, 2023 2:28 pm 
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Location: Ira, MI
Year and Trim: 2001 Bonneville
It was my plug wires!

Or my MAF...I cleaned it to.

Thanks for your help as always....


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