sputtering, lack of power @3500 RPM - 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 12-05-2005, 11:46 PM   #1
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Default sputtering, lack of power @3500 RPM

This is an intermittant problem. Sometimes, when I load up the motor, it starts to pop/sputter and there is a noticeable lack of power, when I back off the throttle a bit the car takes off. It almost feels like when you hit the rev govenor. I thought I might have been looking at water in the gastank, so I put some gas treatment in when I fueled it up. Now at 3/8 of a tank, it'* doing it again. Do the coil packs weaken, or do they just fail? The plugs only have about 6k on them. Any advice will be appreciated.
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Old 12-06-2005, 12:19 AM   #2
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Default Re: sputtering, lack of power @3500 RPM

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Originally Posted by merlin
This is an intermittant problem. Sometimes, when I load up the motor, it starts to pop/sputter and there is a noticeable lack of power, when I back off the throttle a bit the car takes off. It almost feels like when you hit the rev govenor. I thought I might have been looking at water in the gastank, so I put some gas treatment in when I fueled it up. Now at 3/8 of a tank, it'* doing it again. Do the coil packs weaken, or do they just fail? The plugs only have about 6k on them. Any advice will be appreciated.
do you have a check engine light on?
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Old 12-06-2005, 12:28 AM   #3
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change the fuel filter. Located under the right rear door on the inside of the frame rail., $15 and a ten minute job.

Bet it'* plugged.
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Old 12-06-2005, 04:55 AM   #4
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Default Re: sputtering, lack of power @3500 RPM

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do you have a check engine light on?
No.
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Old 12-06-2005, 09:12 AM   #5
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Agree with Bob on this one. Check the fuel pressure if possible. Mortehl had the same type of issues and found it to be fuel pressure.

I only wish he changed the filter before the pump.
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Old 12-06-2005, 10:31 AM   #6
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I'll try this next.
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Old 12-06-2005, 11:41 AM   #7
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Quote:
Originally Posted by merlin
I'll try this next.
Merlin, here'* a good summary from my situation on what to do:

http://www.bonnevilleclub.com/forum/...hlight=#484617

Please note the fuel filter at the top
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Old 12-06-2005, 01:18 PM   #8
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Quote:
Originally Posted by merlin
I'll try this next.
When you check it look for 48-55 psi with the ignition on... It can be as low as 40psi or a hair better with the engine idling... Disconnect the vacume line and you should see 50ish psi

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Old 12-06-2005, 02:46 PM   #9
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And to take Don'* suggestion a step further...

When checking for fuel pressure, slightly push on the accelerator cables on the throttle body to race the engine. Quickly, but not a lot, rap on it. Your fuel pressure shouldn't dive much. Not the differences. If it goes down by much, say to ~ mid 30 lbs. of pressure, it'* likely a pump failure.

I had this exact same issue with my 99 (lack of power at higher RPMs) and it ended up being the pump....as determined by this very test. She runs like a champ now.
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Old 12-06-2005, 03:19 PM   #10
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Fuel pressure would be my first bet as well, however I had missing under load issues as well that were finally traced back to a cracked spark plug insulator. If the fuel pressure idea doesn't pan out, this would be a good place to look next.
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