Quote:
Originally Posted by miverson332
So here is my issue. My engine light came on about one month ago while I was traveling about 45mph up a hill around 2000 rpms. The rpms would hit 2000 and then bounce back down to 1500 rpms. This happened about 3 or 4 times and then the engine light went on. I gave it more gas and it went fine over 2000 rpms and took off up the hill. I checked the code and it came back to a knock sensor. I replaced both knock sensors and intake gaskets. I cleared the code and it has not come back on. However.... I am having the same issue with the rpms surging at about 2000 rpms up hill. It will bounce if I leave the throttle in place, but the engine light will not come back on. The engine idols perfect and drives perfect other than the surge. It seems to get crappy gas mileage as well. I pulled about an 8000lbs trailer while moving, but it never surged or lost power. I have checked and cleaned the MAF and air filter (K&N). I have also replaced the fuel filter. I really don't want to throw any more parts at this thing, especially replacing the dreaded fuel pump. I don't think it is the fuel pump because it only happens at a specific time and only when the engine is warm. I am about to sale this thing and buy a Prius...lol. Just kidding...
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the knock sensor failure is common when the engine is cleaned. care must be taken not to get any water under the upper intake manifold. this is how this occurs as these sensors get corroded.
the foam filler fabricated by GM is a design failure. should have been a solid water proof flexable material. I used dow 795 sealer this sticks well to metal and can handle the temps at that location .
rodents do not like eating it, like that GM foam material.