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Found 2 results

  1. Hello there, totally new here. I am glad to have found this here, lots of valuable infos! So I am the proud owner of a '90 Lumina sedan, with the 3.1 MPFI, or LH0. Since I got it, it always made this slight knocking sound, not like a rod knock, but still annoying. At first it only did it when cold, but it slowly started to do it constantly. Last night it was pretty bad, I could hear it very well even with my windows rolled up. Even at idle I could hear it. Maybe I should have worried about it earlier, but what's done is done. I know the 2nd gen 3.1s were known for knocking for a few reasons, most notably the infamous piston slap. Some people told me MPFIs were prone to that as well, some told me my engine was shot and to just let it blow up What do you guys think? I don't really believe in magical fluids to reduce the sound, since the problem by itself won't be fixed, but I could try using a different engine oil. Apart from that I don't know what to do or where to start really. Thanks for your help
  2. 1997 Lumina 3100. The bearings seem to be bad in my compressor. The air doesn't work and we don't have money to fix the system right now. I don't want to buy a brand new compressor and install it without freon or lubricant, but I'm afraid the present compressor is going to lock up. My best idea was to go to a pull-a-part and find a compressor that has good bearings and install it and keep it unplugged until we can afford to fix the entire air system. I've already replaced the tensioner, water pump and installed a new belt because they all had bad bearings as well. I also don't really want to install a shorter belt and bypass the compressor because that would probably cost as much as buying a used compressor. Any other ideas? Thanks,
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