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#1
05-31-2011, 03:02 PM
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Warm Weather Power Loss
Two years ago, I bought a used, 2001 Impala, with a 3400, which now has 80,000 miles on it. Late last Summer I noticed that it was starting to hesistate under slow accelerations. Occasionally, it would also start with a very rough idle and stall; or, if it didn't stall, it would stumble for several seconds and then rev up and slowly return to a normal idle. It also seemed like there was a loss of power. I cleaned the MAF sensor and changed the plugs and wires with some improvement. It ran fine all Fall and Winter. But earlier this Spring, I took the car South and noticed a return to the rough idle and some loss of power. When I returned home, all was fine. But now that the heat and humidity have returned to the Mid-West, I am once again experiencing all of the aforementioned symptoms. Sounds like a MAP or MAF problem to me since it is seems so weather related. I am hoping someone in the know, can shed some light on the problem. Thanks.
Last edited by THFRO; 07-29-2011 at 10:43 AM. 
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#2
07-29-2011, 10:42 AM
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Re: Warm Weather Power Loss
Okay. Based upon some research, I ended up replacing the MAP sensor. Notice a great improvement at first. But after a few hundred miles have started to notice the surge or miss problem has returned. Wondering if something could be fouling out the MAP sensor. Thoughts?
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#4
07-29-2011, 04:47 PM
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Re: Warm Weather Power Loss
No, I haven't yet. It hasn't shown any, but I guess it wouldn't hurt to check. I just don't know anyone with a Tech II, so it would be an Autozone check. Also, I just check it for vacuum leaks with trottle body cleaner. None found.
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#5
07-29-2011, 07:36 PM
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Re: Warm Weather Power Loss
Take the vacuum hose off of the fuel pressure regulator and see if fuel is leaking through the regulator. Especially if it gets worse after a hot soak.
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#7
09-16-2011, 01:41 PM
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Re: Warm Weather Power Loss
Okay. Found the problem. It turned out to be the fuel pump. The problem kept getting worse and I was also getting a lot of static on FM channels. Then one day when I turned the key to "on", I heard the fuel pump making a chugging noise rather than the usual whine; $270 later, the problem is fixed and the performance continues to improve the more I drive. Apparently, the old unit was also the cause of the radio static, since it too has improved. For the first time since I bought this car used, it runs like it should.
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