Join Date: Aug 2009
Location: San Diego, CA
Feedback Score: 0 reviews
We hooked up my AE to it this evening & found the following:
-The engine never started, but cranked fine. It did not ever try to fire.
-Vref (as monitored by AE) was 5.02 volts - we didn't actually measure at a connector
-Engine RPM (as monitored by AE) while cranking was about 130 rpm, so I believe the CPS is fine
-I almost missed the fuel injector pulse width, but I saw .6 msec when we were cranking
-IPR duty cycle was about 14% when not cranking, and quickly went up to almost 70% while cranking, and then back down to 14% when cranking stopped. ICP read 0 psig (don't know why, but we know this is a problem). When we tried it over a month ago, we were getting around 600 psig.
-We unplugged the ICP and tried cranking again. IPR duty cycle was about 14 % when not cranking, and went to about 35% while cranking, and then back down to 14% when cranking stopped. ICP was about 2300 psig.
-Engine RPM was about 130 rpm while cranking. There was a multimeter connected to the batteries and voltage never went below 11 vdc while cranking.
-Several weeks ago, the engine would stay running only when given a shot of starting fluid and running the high idle tune on a DP Tuner. The engine would die as soon as a tune with a lower idle speed was selected. I don't know the exact workings of the HPOP, but my guess is that the higher engine RPM allowed the HPOP to overcome the pressure loss from a leak somewhere.
-For reference, I monitored ICP and IPR duty cycle on my truck while starting (it runs fine with no problems) and saw no higher than 35% IPR duty cycle while cranking (about 14% once running) and ICP was around 500-600 psig while cranking.
I think I'm seeing 2 issues here:
1) ICP definitely has something wrong - either bad sensor or bad communication to PCM.
2) IPR duty cycle seems too high - my guess is a leak in the high pressure oil system somewhere. Since there are no external oil leaks, my guess is an injector o-ring.
Any other thoughts on this?
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