car hesitation
04-19-2008, 12:50 PM
#1
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car hesitation Hey, please ignore the post i made about startup help, got the car running and everything seems to be fine. However when I took the car out for a quick drive and notice that it hesitates around 2000-3000 rpm at like half throttle, even if I step on it, she seems to kind of lag before picking up. It's mostly in 2nd gear but does it in all I believe, and I do remember it doing this last summer before I put it away but I thought it was normal. It seems regardless of the how much throttle you give it, it just hesitates between those rpm's and basically feels like it should be accelerating faster. Could it be an 02 sensor? I had a problem with the passenger side one last year where the SES light would come after going fast or over a bump. I had it scanned and was told it was bad, but when it turned off I ignored it knowing I was doing exhaust this year.
04-20-2008, 11:29 AM
#5
You might try cleaning your MAF. (Make sure you get special-purpose MAF cleaner.) When the MAF gets dirty, the engine senses less air going to the engine than is actually getting through. When this happens, the ECM cuts gas flow to the engine to compensate, causing a hesitation. (I've also had this throw O2 codes.)
If this is part of the issue, you'll get the problem under acceleration, no matter the gear. You should also make sure your fuel filter is good. (I had a problem with both at the same time, which just magnified the issue.)
GM claims K&N filters foul the MAF with oil. K&N claims the sensors leak silicone on the elements. Whatever the cause, cleaning the MAF is a cheap/easy thing to do/try.
If this is part of the issue, you'll get the problem under acceleration, no matter the gear. You should also make sure your fuel filter is good. (I had a problem with both at the same time, which just magnified the issue.)
GM claims K&N filters foul the MAF with oil. K&N claims the sensors leak silicone on the elements. Whatever the cause, cleaning the MAF is a cheap/easy thing to do/try.
04-20-2008, 04:48 PM
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04-20-2008, 05:57 PM
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Well it seems to have gone away, or at least i think it has. This morning a couple friends and I went to get some eats and it was almost chugging when i tried putting it down in 2nd, like as if i was bumping the throttle on and off. I bought some electrical cleaner just now and took of my lid and the maf screen was full of some bugs and little white furs and ****, so i took it inside and sprayed everything down and wiped it good. Took her back out for a spin and she seemed to pickup better, 1st i didn't notice anything and 2nd there was a little bit of slight hesitation but the car was like that for as long as I can remember. I mean it feels like once you get past 60km's per hour and about 32-3500rpm it just picks right up and goes, if I go through the gears to red line and shift I don't seem to notice it. I don't know, I mean if i go through 2nd gear with light throttle I can feel something in my foot, like the speedo still goes up but the car feels like it's not going for a second or 2
