Low RPM Stutter has progressed to Rough Idle/Labored Accel - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-01-2007, 01:50 AM   #1
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Default Low RPM Stutter has progressed to Rough Idle/Labored Accel

Benevolent Bonneville Gurus,

Do lend me your expertise. What started as a Low RPM stutter under load has progressed to a rough Idle / labored acceleration problem with my '95 SSEi

When driving, I sense crisp throttle response, but the engines seems like its being starved for gas and/or feels like the my 3 year old high flow cat is plugged. The engine hesitates, stumbles and has very little power.

I shot a video of my engine. Hopefully you can discern the electrical popping noise in the audio (especially at the end).
http://s5.photobucket.com/albums/y17...Bonneville.flv

I've already replaced the following:
TPS sensor
EGR Valve
Vacuum hose connectors

I've tested the Coil packs as per Techinfo instructions
- cleaned K&N air Filter
- checked all fluids
- used injector cleaner in gas tank
- cleaned TB and carefully cleaned MAF
- Examined my 2 year old Bosch Platinum 100k mile plugs and premium wires - Not fouled and still gaped correctly (I examined just one from the front)

Any help would be greatly appreciated!
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Old 07-01-2007, 02:14 AM   #2
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Here'* a good start for you:

http://www.bonnevilleclub.com/forum/...=article&k=103

Do the wires at the same time. The majority here prefer Belden Premium'* from NAPA. The Series 2 set fits fine.
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Old 07-01-2007, 02:32 AM   #3
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Much Obliged! I'll post my results
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Old 07-02-2007, 12:56 AM   #4
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Besides "honey ... your getting lucky tonight" is there anything sweeter than listening to one'* Bonneville purring like a kitten?

Willwren, you were exactly right about the plugs and wires being bad. In fact, when I went to pull the #6 wire, it was almost severed just above the connector and had been arching (thus explaining the popping sound).

The wires were only 2.5 years old and were 8mm Autolite premiums. I took your reccomedatoin on new Napa Wires and Copper Plugs

I'm a first time poster, but a long time reader. I appreciate all who contribute their knowledge here. Sometimes it'* a bit challenging using the forum search function, but I'm getting better at it.

Is there a diagnostic flowchart somewere in the archives, by chance?

Thanks again!
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Old 07-02-2007, 12:59 AM   #5
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congrats!

flowchart for what problem?
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Old 07-02-2007, 01:21 AM   #6
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Well just a general trouble shooting flow chart or guide might help someone like myself, who knows just enough to be dangerous.
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Old 07-02-2007, 01:28 AM   #7
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a factory service manual, or the Search button at the top left of every page here would do you much help
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Old 07-02-2007, 09:22 AM   #8
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The Autolite Professionals are also a very good wire. It'* a shame that we didn't mention other options to you for wires.

While the Napa'* are good...they are not the only good choice out there. If I remember properly, the Autolite Pro'* are a lifetime wire and we could have had you get a fresh set for free instead of the cost of the new Napa ones.
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Old 07-02-2007, 09:50 AM   #9
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I just happen to have Autolite Pro'* on mine, by chance. I put them on years ago to attempt to get a better wire than I had before then. They are still good today.

Also, regarding your request for a diagnostic flow chart. Probably the best that we could provide, given enough time to put them together, would be to provide a short series of diagnostic charts for the most common issues we've noted here. Bear in mind that the current '96-99 Factory Service Manual is a two-volume series that measures about 3-1/2" thick when put together. In that manual are many many different flow charts.

That is why we regularly suggest the purchase of a set of FSMs to those that will be doing more than minor and ocassional repairs to their car. The $30-$75 you pay for a used FSM set on ebay will usually more than come back to you after one major repair or a couple minor ones.
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