Hesitation Under Light Loads - Chevy Impala SS Forum
 
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post #1 of 4 (permalink) Old 04-11-2012, 05:15 PM Thread Starter
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Hesitation Under Light Loads

Ever since I got this car, it's had a hesitation when accelerating. It' only does it in first gear, from what I can tell.

The car starts right up, idles fine, put it in gear, and it moves fine, but if you are at a standstill, and pull out of your driveway, as you are easing on the throttle, the car stumbles/hesitates (and bucks ever so slightly) a few times, until you give it a bit more gas (say, 1/3rd throttle?) and it evens out and runs fine. It responds well to throttle input in every situation but this.

It did it with fuel pump #2, and I just replaced the pump again (for unrelated reasons) under warranty, and the symptoms are the exact same, so I doubt the pump is to blame.

Any ideas? I read the other stumble/misfire thread, but his symptoms are a bit different than mine.

1994 Lincoln Town Car, Signature Series, 4.6L V8, fully loaded, 150K -
1993 GMC Sierra K1500, SLE, 5.0 V8, Auto, 129K -
1993 GMC Sierra C2500, SL, 4.3L V6, 5 Spd, 255K - Sold.
1977 Lincoln Continental Town Car, 7.5L V8, Auto, 77K -Sold.
1995 Chevrolet Caprice Classic, 4.3L V8, 156K -Sold.


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post #2 of 4 (permalink) Old 04-11-2012, 05:43 PM Thread Starter
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Several people mention cleaning the MAF sensor. How should I do this? IIRC, rubbing alcohol is a bad thing to use, not sure what a good alternative would be.

1994 Lincoln Town Car, Signature Series, 4.6L V8, fully loaded, 150K -
1993 GMC Sierra K1500, SLE, 5.0 V8, Auto, 129K -
1993 GMC Sierra C2500, SL, 4.3L V6, 5 Spd, 255K - Sold.
1977 Lincoln Continental Town Car, 7.5L V8, Auto, 77K -Sold.
1995 Chevrolet Caprice Classic, 4.3L V8, 156K -Sold.


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post #3 of 4 (permalink) Old 04-11-2012, 06:35 PM
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Originally Posted by SignatureSeriesOwner View Post
Several people mention cleaning the MAF sensor. How should I do this? IIRC, rubbing alcohol is a bad thing to use, not sure what a good alternative would be.
They have MAF sensor specific cleaner at the parts store. I think it's made by CRC in a red can. You can use a q-tip with the cleaner, but go easy because the sensor wires are tiny and fragile. You could also try cleaning the throttle body if you haven't already. I recently did this(t.b.) and it fixed an idle issue I was having.

95 Caprice wagon DCM
ISSCA # 2424
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post #4 of 4 (permalink) Old 04-11-2012, 06:54 PM
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check for vacuum leaks behind the MAF sensor.


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