I have a 2007 M8 153" all stock except for a D&D -pipe and the ECU has the factory reprgramming. It has 3800 miles on it and has had zero changes since new except the top end was rebuilt at 3000 miles for maintanence (used OEM pistons).
engine seized on exhaust and intake side of (mag) piston. no wash on dome as compared to pto-suspect fuel delivery issue.
Here is the issue as noted by the mechanic-
engine is oiling fine
cooling system is fine as well.
No lights coming on, engine has a lean hiccup on accel occasionally and goes flat/lean at roughly 1/8 throttle on test stand.
installed egt to monitor exh temps while testing: 300 idle, up to 900-1000 at 1/8 throttle.
Coolant temp sender(.89K ohm-2.9K ohm)
TPS(.690-3.790)
Air temp sender-no fault,
Deto- no fault, baro sensor and tube,
Tried another known good ecm no difference
Dunk and pressure tested injectors
Pressure/smoke tested engine
Visually tore down and inspected entire intake/reeds/t-body/boots-all fine
Fuel pressure was 37psi, installed adjustable regulator kit and have upped pressure to 46psi-no noteable change.
Fuel Pump bypass volume tested well
Fuel pump running voltage is 16.4v steady
Runs the same with coolant temp sensor unplugged
Hi voltage tested stator pump coil-within spec
This is what I have done: I borrowed a friends 2009 M8 which shares a lot sensors as the 2007, so we decided swapoing some sensors to see if we were getting some false readings.
Swapped collant sensor- No change
Swapped pipe sensor- No change
Swapped air sensor- No change
Swapped throttle bodies- No change This was to eliminate the TPS sensor.
Note: the my 2007 and the 2009 shared the same "Square" symboled Throttle bodies. However the lean bog seemed to be enen worse but definitely not better.
The only think we can think of that is left to swap out is the main wire harness, BUT that will cost $600 and I would rather not spend the coin and be wrong.
Any suggestions? Something we missed CAT guys?
Need to figure this out ASAP....
Thank you,
Brent
engine seized on exhaust and intake side of (mag) piston. no wash on dome as compared to pto-suspect fuel delivery issue.
Here is the issue as noted by the mechanic-
engine is oiling fine
cooling system is fine as well.
No lights coming on, engine has a lean hiccup on accel occasionally and goes flat/lean at roughly 1/8 throttle on test stand.
installed egt to monitor exh temps while testing: 300 idle, up to 900-1000 at 1/8 throttle.
Coolant temp sender(.89K ohm-2.9K ohm)
TPS(.690-3.790)
Air temp sender-no fault,
Deto- no fault, baro sensor and tube,
Tried another known good ecm no difference
Dunk and pressure tested injectors
Pressure/smoke tested engine
Visually tore down and inspected entire intake/reeds/t-body/boots-all fine
Fuel pressure was 37psi, installed adjustable regulator kit and have upped pressure to 46psi-no noteable change.
Fuel Pump bypass volume tested well
Fuel pump running voltage is 16.4v steady
Runs the same with coolant temp sensor unplugged
Hi voltage tested stator pump coil-within spec
This is what I have done: I borrowed a friends 2009 M8 which shares a lot sensors as the 2007, so we decided swapoing some sensors to see if we were getting some false readings.
Swapped collant sensor- No change
Swapped pipe sensor- No change
Swapped air sensor- No change
Swapped throttle bodies- No change This was to eliminate the TPS sensor.
Note: the my 2007 and the 2009 shared the same "Square" symboled Throttle bodies. However the lean bog seemed to be enen worse but definitely not better.
The only think we can think of that is left to swap out is the main wire harness, BUT that will cost $600 and I would rather not spend the coin and be wrong.
Any suggestions? Something we missed CAT guys?
Need to figure this out ASAP....
Thank you,
Brent
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