4.7l misfire in Cyl. #5
#12
#13
So over the past few weeks I have swapped around fuel injectors, ignition coils, and spark plugs. Reset the engine codes multiple times, and checked for any leaky vacuum lines. Nothing seems to be changing the confirmed cylinder 5 misfire, and detected cylinders 3 and 4 misfires. I was unable to do a compression check, the spark plug adapter piece was too large, and wouldn't allow a socket into the hole in the engine block.
At this point, if I drive more than 5-10 miles my check engine light begins to flash. Really in desperate need of a way to troubleshoot and fix this issue.
At this point, if I drive more than 5-10 miles my check engine light begins to flash. Really in desperate need of a way to troubleshoot and fix this issue.
#14
Are you losing any coolant? Back when I had an head gasket issue, it was with cylinder 5. When I pulled the plugs, I could see that #5 was being steam cleaned and with a bore scope, I was able to see a little coolant in the cylinder. This truck always starts on first crank, but when it was manifesting, it was cranking longer before starting.
#15
Are you losing any coolant? Back when I had an head gasket issue, it was with cylinder 5. When I pulled the plugs, I could see that #5 was being steam cleaned and with a bore scope, I was able to see a little coolant in the cylinder. This truck always starts on first crank, but when it was manifesting, it was cranking longer before starting.
#16
#17
Last edited by Lifteddakotasport01; 12-20-2018 at 06:26 PM.
#18
O2 sensors have a variety of failure modes that won't set codes. So long as the data the PCM is getting from the sensor is within the 'acceptable range', the PCM will use it. It has no clue if the data is accurate or not.
#20
The answer to the coolant question is yes, but a strange yes. It's not that the coolant leaks and is lost or burnt up. For some reason my coolant all gets pushed back into the radiator reservior about once a week due to excessive pressure in the coolant system. I have to manually pull the coolant out of the reservior and put it back directly into the radiator cap, on a regular basis. If I keep putting in new coolant, the reservior overflows and makes quite a mess inside my engine bay.