Hummer H3 problem starting on first crank.
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Details:
Vehicle almost never starts on first "timed" crank. Vehicle almost always starts immediately on second "held" crank of the key. Fuel pressure starts at 57PSI and quickly drops 5PSI in 8 seconds. Issue persists with key on, engine off priming. Check engine codes are: P0136 & P0137. Engine occasionally and sporadically rev's during normal operation as if I am pressing the throttle.
What I've tried:
Replaced spark plugs
Checked/swapped fuses and relays
Cleaned/replaced MAF
Cleaned and replaced both O2 sensors
Cleaned intake valves via fuel rail and throttle body inlets
Additional fuel through intake (makes issue worse)
Fixed vacuum leak
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H3 HUMPER is an overlanding machine made for adventure. Here are the stories of nursing this rig back to health during the pandemic road trip.
