Goughary

Why would i have a bad knock?

I am 5k post fresh top-end rebuild... New dizzy belt, new rotors and caps. everything checked out fine. And I have been hearing a nastly knock...

Only thing I can think of is caps or coils?

Anyone have any ideas?

Rocket Rob

Ruh roh.....a knock is typically not good. Can you isolate where the noise is coming from?

Goughary

well - it only happens when I am driving - and sounds like the right hand side of the engine - so cylindars 4, 5, or 6, I think...

it may not be knock - but sure does sound like it....

Earlydays

When you say "knock", do you mean the "pinging" you get from retarded spark, poor fuel, broken distributor belt, etc., or do you mean a hard "knocking" sound, like bad bearings, bent valves, etc.??

Goughary

knock like pinging - standard engine knock noise...it's just confusing what would cause it - EVERYTING on this car is basically new at this point (except the knock sensors, of course - but they should be fine...)

Rocket Rob

When does the knocking happen? When driving steady or hard acceleration or deceleration? Have you ruled out external causes like a faulty engine mount or something similar?

sundog

The signs of my bad bearing were a "knock" at neutral acceleration, i.e. no load on the engine from acceleration or deceleration.

If yours is happening on acceleration it could be a problem with the knock sensors. Mine weren't communicating right when I put it back together, and had to diagnose that one.