Question about 1991 Honda Prelude
Check the timing. Backfiring may be from timing is wrong, or valve train problems. I would do a compression test of the engine before buying any new parts. This will tell you the internal health of the engine, how sound it is. This is more than a small vacuum leak, like from a vacuum hose; maybe a large air leak, like the intake manifold gasket, just a possibility, but do the compression test first.
Blue smoke would be oil burning, is your engine worn out (compression test!)? A '91 prelude could have 400,000 miles !
Posted on Mar 30, 2015
Have you checked out the exhaust system , it sound like the engine converter or muffler is blocked.
Posted on Jun 19, 2015
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Posted on Jan 02, 2017
First run a tank of a strong fuel system cleaner like BG-44K. If that doesn't help, clean the throttle body. If that doesn't help, take it to a mechanic.
Posted on Nov 03, 2009
I had a similar problem and the mechanic diagnosed it as a problem with the ignition coil. So you might want to get that checked.
Posted on Nov 11, 2009
Ignition coils has to be the answer. if it was the fuel pump your car wouldnt start. So i would say contact audi. they should have sent you a letter in the mail. We have the same car and i got a letter from them. ignition coils are the recall for the 02 a4.
Posted on Apr 08, 2010
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