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Car Forum / Porsche / Porshe 944 / April 2005Missing on #2
Hi, my 1984 944 has been missing on cylinder 2, all the plugs are firing, but #2 shows it to be running rich, I switched the injector, but it stayed the same. is there anything else this could be but a valve problem, hopefully something I could fix without pulling the head? Thanks Peter run a compression check first, that will tell you a lot. > Hi, my 1984 944 has been missing on cylinder 2, all the plugs are firing, > but #2 shows it to be running rich, I switched the injector, but it stayed [quoted text clipped - 3 lines] > Thanks > Peter Compression showed good on all four, all equal > run a compression check first, that will tell you a lot. >> Hi, my 1984 944 has been missing on cylinder 2, all the plugs are firing, [quoted text clipped - 5 lines] >> Thanks >> Peter Try changing the plug and high tension lead on the bad cylinder. and swap the injector with one of the other cylinders, see what happens >Try changing the plug and high tension lead on the bad cylinder. > > Did that too, swapped it with another car, this is driving me nuts, nothing seems to solve this. > and swap the injector with one of the other cylinders, see what happens > >>Try changing the plug and high tension lead on the bad cylinder. Could be a failed gasket on the intake to #2. Or a crack in the intake allowing excess air in. did you check the fuel pressure regulator vac diaphram could be leaking gas into the intake not sure if thats it but i have seen it more than once to fail just a thought > Compression showed good on all four, all equal > [quoted text clipped - 7 lines] > >> Thanks > >> Peter ok, now we are gaining on it - if you have equal compresson on all 4, and it's reasonable, then you KNOW that valves, valve timing, and piston/rings and head are all OK. So, what's left - not much beyond the injector and the plug wires. so, if it were me, I'd swap the #2 injector with another cylinder and see if the problem persists. If yes, swap plug. If yes, replace plug wire > Compression showed good on all four, all equal > [quoted text clipped - 7 lines] > >> Thanks > >> Peter So, if you go through all of the above and it still runs rich on #2 you are left with a failed or badly worn cam lobe on the intake valve. Peter, Try spraying WD-40 around the intake where it meets the block. I did this to find an intake leak. When the spray hit the leak, it smoothed out momentarily. I picked up new gasgets from my dealer and fixed it in about 2 hours. Let me know if that helps > Hi, my 1984 944 has been missing on cylinder 2, all the plugs are firing, > but #2 shows it to be running rich, I switched the injector, but it stayed [quoted text clipped - 3 lines] > Thanks > Peter |
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