Very Minor Sputtering/Hesitation at low rpms. -*UPDATE PICS* - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

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Very Minor Sputtering/Hesitation at low rpms. -*UPDATE PICS*

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Old 04-26-2005, 11:55 PM
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Default Very Minor Sputtering/Hesitation at low rpms. -*UPDATE PICS*

1994 L27 3800


I have had a problem at 40 or 45mph for a while now but NEVER from a stop. right now if you JUST start the car up and go drive (like you should not do) it goes into gear but when you give it throttle it "chokes/hesitates/studders/shakes" but it is minor and only with light throttle from a stop...Usually when the engine is cold, but I can faintly feel it when the car is warmed up at an intersection...but enough for me to feel it. If you give it throttle it hauls off.

No problem at above 1500rpm I dont think.


I have just:

- Replaced Plugs with Delco OEMs gapped 3 times for accuracy
- Replaced wires with 8.5mm Autolite pros.



I am hoping it is related to my 45mph/3rd gear shudder.


Where do I go from here?

I know willwren was saying check ignition with my other studder problem, so I am wondering where to go? NO CODES EVER HAVE BEEN THROWN ON THE CAR.


- Ignition Coil bad?
- Ignition Module?
- Crank Sensor?
- Cam Sensor?
- MAF Sensor?
- IAC Sensor?

- Something else maybe?

What is going on?
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Old 04-27-2005, 12:05 AM
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My car had the same studder when i first got it. I had to change the maf sensor now she purrrrs.
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Old 04-27-2005, 12:20 AM
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Originally Posted by OLDsman105
My car had the same studder when i first got it. I had to change the maf sensor now she purrrrs.
Can you explain the problem you had exactly in a little more detail?
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Old 04-27-2005, 12:22 AM
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Try cleaning your TB and MAF sensor. Especially the IAC passage.
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Old 04-27-2005, 01:13 AM
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Originally Posted by willwren
Try cleaning your TB and MAF sensor. Especially the IAC passage.

Holy Censored

Got done cleaning the MAF...which for some reason I had not cleaned..ever. I cleaned up the IAC when I did the intake but was too parinoid as with my 87 I sorta fried the MAF when I tried cleaning it.

I just gone done with a 20 minute cleaning session of the MAF with 70% rubbing alcohol deluted with 50% distilled water being VERY careful I used a piece of cloth (pretty much best lint free you can get -- used for cleaning drums in copiers)...



I took it for a test drive and the 2.84 screeched when I gave it gas . Seems like I restored about 20lb of torque. I cannot tell about the hesitation yet since I need to wait for the car to get cold overnight but I am SHOCKED that the gunk on the two thermistors or whatever could affect the torque and performance that much.

I was always under the impression that MAF problems never affected actual WOT performance THAT MUCH.

I will get back to see if it fixed the hesitiation. I think the 38-45 studder/shake is still there like before but that is only in 3rd gear. I have a feeling I fixed more than just the power drop.

here are some pics of what the MAF should look like.



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