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My 1995 LeSabre misfires on cylinder #4. In fact it almost never fires. The other 5 never fail to fire.
But the spark plug has spark, and the injector sprays.
It has new wires and new spark plugs, new coils and ignition.
Fuel pressure OK.
I switched injector with another cylinder, but #4 continued to misfire.
The car starts every time and it will drive places. I just don't want to until I fix that problem.
I did an incomplete cylinder compression test:
I attached a compression gauge to cylinder #4 and started the engine. I got 62 pounds pressure (Average, I guess).
Then, I connected the gauge to cylinder #3 and started the engine. I got 67 pounds pressure. A difference of 5 pounds.
Any idea why #4 doesn't fire? Could a little lower compression be the problem?
Thank you,
Antonio.
But the spark plug has spark, and the injector sprays.
It has new wires and new spark plugs, new coils and ignition.
Fuel pressure OK.
I switched injector with another cylinder, but #4 continued to misfire.
The car starts every time and it will drive places. I just don't want to until I fix that problem.
I did an incomplete cylinder compression test:
I attached a compression gauge to cylinder #4 and started the engine. I got 62 pounds pressure (Average, I guess).
Then, I connected the gauge to cylinder #3 and started the engine. I got 67 pounds pressure. A difference of 5 pounds.
Any idea why #4 doesn't fire? Could a little lower compression be the problem?
Thank you,
Antonio.