93 loyale pop pop pop only when #3 cylinder on dizzy?

[bheinen74]

what is causing a pop pop pop pop or knock nok nok on cyl #3 when plug wire is on coil. misses but no poppopopopopo when wire detached from dizzy..

 

i am not famiiar with the ea82 but do know ea81 and ej22 and ej25.....

 

 

backgrund new car to me bought for cheap :

 

already reolaced dizzy, plugs

timing belts good shape and timing is checking out good. doh i am going to part the red turd soon if nothing comes on this thread.

[Dirk]

Hey,

 

My thoughts are as follows:

 

If it is a sort of pinging or knocking noise then I wonder if you are getting some sort of pre-ignition in that cylinder.

 

The number 3 cylinder is the farthest away from the water pump so it may be a tad hotter.

 

Check the plugs and see if the number 3 plug is a different colour to the others.

 

If it is this, you will have to consider why.

 

Could be a one or a combination of things.

 

1. Timing

2. Plug values.

3. Fuel ratio

4. Carbon build up in combustion chamber

5. sharp edges in combustion chamber

6. clogged water passages

7. incorrect/faulty thermostatic valve

8. faulty water pump

 

and so on......

 

If the sound is more like a pop. then I would be considering the possiblity of burned or sticking valves.

 

A compression test would help diagnose this.

 

More details on the noise would be good. Also when is it more pronounced and when less.

 

Cheers

[TomRhere]

Have you tried swapping out the plug wire for that cylinder?

[Dirk]

Saw your post about compression.

 

Numbers look ok to me. Not great but not a concern.

 

Could your timing belt be out a touch on the 1 and 3 head?

 

Other than the noise, how does the engine run?

Edited July 21, 2011 by Dirk