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Old 12-29-2012, 08:58 PM   #1
Smokin3161
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Default Sputtering and Misfire issues in Drive and Reverse

Hi, I recently did a tune up on my 98 Malibu LS... For the first few days it was fine and ran amazing. Recently when I'm idling at a light or in reverse under 10mph it sputters or maybe misfires.

I have checked to make sure everything is seated fine, tight and in correct order. Its very annoying and never did this before. I'm used to driving foreign cars and new to American cars IE my first Chevy. Can someone please shed some light?

Also I put my hand over the tail pipe and noticed the exhaust wasn't flowing freely, but like I said this didn't happen until I did the Tune up.
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Old 12-31-2012, 09:35 AM   #2
Smokin3161
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Default Re: Sputtering and Misfire issues in Drive and Reverse

Does anyone have any answers? I figured coming here would help....
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Old 12-31-2012, 09:49 PM   #3
RalphP
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Default Re: Sputtering and Misfire issues in Drive and Reverse

Check all vacuum hoses. I've had to replace a few on my 2000.

Especially the one from the PCV valve, under the throttle cable bracket (where it connects to the upper intake) and back to the EGR valve.

RwP
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335K miles on original motor and tranny (only motor work 2 x LIM replacement), Monroe SensaTrac struts front and back (new at approx. 300K miles), and Alero discs in back. LS fogs added with custom wiring. HID high beams, HIR low and halogen fogs. Raybestos Pro Grade front rotors and Bendix D747 ceramic pads on front.

Addendum: Rest in peace. Surge tank blew, motor overheated, I think she's lived a long and useful life.
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Old 01-01-2013, 08:20 AM   #4
Smokin3161
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Default Re: Sputtering and Misfire issues in Drive and Reverse

Quote:
Originally Posted by RalphP View Post
Check all vacuum hoses. I've had to replace a few on my 2000.

Especially the one from the PCV valve, under the throttle cable bracket (where it connects to the upper intake) and back to the EGR valve.

RwP
I checked all my vacuum lines that i was able to locate, all seemed intact and connected. Any other suggestions?
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Old 01-01-2013, 01:39 PM   #5
RalphP
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Default Re: Sputtering and Misfire issues in Drive and Reverse

Time to drag out the timing light and verify engine timing - you may have a jumped timing chain (not likely!)

Also, triple check ALL wiring. One suggesting is to take a dark night, start the car, and fog the plug wiring with a mist of water.

In my personal experience, #1 and #3 spark plug wires are right royal pains in that it's easy to feel like they're on, but they'll jump right off. I had #4 cylinder give me fits my first tune up until I finally got it seated properly.

Also, there's a chance a coil pack has failed or is failing. This would tell you (the misting with water) due to the corona and sparking you'd see.

It's also time to check the fuel line pressure with a fuel line pressure gauge (they're cheap at Harbor Freight, albeit not very accurate.)

RwP
__________________
335K miles on original motor and tranny (only motor work 2 x LIM replacement), Monroe SensaTrac struts front and back (new at approx. 300K miles), and Alero discs in back. LS fogs added with custom wiring. HID high beams, HIR low and halogen fogs. Raybestos Pro Grade front rotors and Bendix D747 ceramic pads on front.

Addendum: Rest in peace. Surge tank blew, motor overheated, I think she's lived a long and useful life.
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Old 01-01-2013, 08:16 PM   #6
Smokin3161
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1998 Malibu LS
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Default Re: Sputtering and Misfire issues in Drive and Reverse

Quote:
Originally Posted by RalphP View Post
Time to drag out the timing light and verify engine timing - you may have a jumped timing chain (not likely!)

Also, triple check ALL wiring. One suggesting is to take a dark night, start the car, and fog the plug wiring with a mist of water.

In my personal experience, #1 and #3 spark plug wires are right royal pains in that it's easy to feel like they're on, but they'll jump right off. I had #4 cylinder give me fits my first tune up until I finally got it seated properly.

Also, there's a chance a coil pack has failed or is failing. This would tell you (the misting with water) due to the corona and sparking you'd see.

It's also time to check the fuel line pressure with a fuel line pressure gauge (they're cheap at Harbor Freight, albeit not very accurate.)

RwP
I will try these suggestions, I stopped to see my buddy today and he told me to check the gap on the plugs. I think they came pre gapped but Im going to pull them all and see.
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