miss fire cyclinder 1 and 4 - ZR-1 Net Registry Forums

mallett · 11-08-2013

check compression 175 dry 200 wet on 1 and 200 on 4 do I need to pull intake to ohm injectors and or coil spark plugs were replaced is there a way to ohm injectors I think injectors are bad because plugs are wet and cylinder compression jump up like it had been washed out from fuel with out pulling intake tried fuel leak down no pressure drop on injectors. fuel system was just flushed had bad fuel 300 miles ago ran fine. Having a hard time the car is a 1990 with 3000 miles I was only 15 when it was new so any help would be great.

mike100 · 11-08-2013

at this point, if it is safe to do so (fuel exposure wise), you can take an extra spark plug on the end of the plug wire grounded somewhere safe and check for the presence of a good blue spark, weak yellow spark, or non-existent spark in the bad cylinder. Cylinders 1&4 are not on the same coil pack I don't believe.

These cars certainly have a reputation for bad injectors- you will likely need to work on those even if they are not the primary cause of the problem or had obviously been replaced before.

Kevin · 11-08-2013

90 with 3000 miles? injectors need changed out.

11-08-2013	#1
mallett Join Date: Nov 2013 Location: bedford ohio Posts: 1	miss fire cyclinder 1 and 4 check compression 175 dry 200 wet on 1 and 200 on 4 do I need to pull intake to ohm injectors and or coil spark plugs were replaced is there a way to ohm injectors I think injectors are bad because plugs are wet and cylinder compression jump up like it had been washed out from fuel with out pulling intake tried fuel leak down no pressure drop on injectors. fuel system was just flushed had bad fuel 300 miles ago ran fine. Having a hard time the car is a 1990 with 3000 miles I was only 15 when it was new so any help would be great.

11-08-2013	#2
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,786	Re: miss fire cyclinder 1 and 4 at this point, if it is safe to do so (fuel exposure wise), you can take an extra spark plug on the end of the plug wire grounded somewhere safe and check for the presence of a good blue spark, weak yellow spark, or non-existent spark in the bad cylinder. Cylinders 1&4 are not on the same coil pack I don't believe. These cars certainly have a reputation for bad injectors- you will likely need to work on those even if they are not the primary cause of the problem or had obviously been replaced before.

11-08-2013	#3
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,624	Re: miss fire cyclinder 1 and 4 90 with 3000 miles? injectors need changed out. __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"