1993 mazda b2600I engine knocking

Asked by Nov 04, 2013 at 06:11 PM about the 1993 Mazda B-Series Pickup 2 Dr B2600i Extended Cab SB

Question type: Maintenance & Repair

My 1993 mazda b2600i runs great!  But, if I give more than about 25% throttle, it knocks like crazy and it does not feel like it picks up any faster.  any ideas??

7 Answers

27,535

A couple of things (besides a plain ol' wore out motor): Plugged exhaust/cat: carbon build up on the piston(s): Jumped timing: bad fuel: mis-routed plug wires

1 people found this helpful.
45

If it idles good, OK, But on acceleration pressure it fails. But it sounds like it needs air, intake to me Just my guess

27,535

Sounds more like a plugged cat.

hmmm. that could me, The car has a new exhaust from the cat back

27,535

A plugged catalytic Converter will cause a backfire condition - lean - no air out - no air in. You could hook up a vacuum gauge and watch how it acts as you increase RPM to say 2500 and hold it there for several seconds - is the reading low or does it fall off at a steady speed? You could disconnect the exhaust at the manifolds and run the engine - noisy but effective. A muffler shop has the proper tools to make a hole in the pipe and measure the back pressure.

would it matter that i dont have any backfiring?

27,535

No.

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