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In Reply to: Half of V12 sick posted by David F on October 01, 2000 at 19:29:09:
My 88 750 misfires most notibly at highway speeds (sometimes of idle). Also, the idle is not as smooth as it should be. This condition appeared abrubtly one day.
I have narrowed the problem to the left cylinder bank (7-12). If I pull the fuel pump relay and DME relay for 7-12 bank then the engine attempts to fire and run but will not. I receive no EML light during cranking and the tach responds. The engine will run on cylinder bank 1-6 but I get an EML light and the tach does not respond.
What I have tried so far:
1. Switched coils side to side.
2. Switched DME's side to side.
3. Switched mass air flow sensors side to side.
4. Measured electrical resistance of crankshaft position sensors. Each sensors measure identical and within specs.
5. Measured intake air sensor resistance...within specs.
6. Verified fuel pump working (audibly) for left bank (7-12).
What I have not done:
1. Checked rotor and cap resistance.
2. Checked plug wire resistance.
3. Checked coolant temp sensors
4. Checked oxygen sensors.
5. Fuel pressure and fuel pressure regulators.
Anyone have any ideas as to why cylinders 7-12 wont run? Why I get no EML (7-12) or why no tach on cylinders 1-6? Obviously cylinders 7-12 are partially working otherwise I would notice the resultant poor performance and probably get an EML.
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