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Posted on Jan 02, 2017
First, you need to check the MAF sensor for contamination.
Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.
Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.
Posted on Sep 01, 2008
Some GM products also incorporate the oil sender switch into that circuit for fuel pump, so that in case of an accident, engine shuts off, oil pressure drops, in turn, shuts off power to fuel pump. May be worth a look at what your getting for oil pressure, as well as checking switch/sender.
Posted on Feb 13, 2009
Check to see if the fuel pump is kicking in,
when you turn the key on without starting the van you should hear it kick on for about 2 seconds,
It could be...
A clogged fuel filter...
Blown fuse for the pump..or bad pump relay..
Bad fuel pump
Posted on Mar 07, 2009
sounds to me like either your in need of a tune up or there is a chance your crank position sensor is going out or finally gone.
Posted on Apr 17, 2009
this is caused by slow engine idle speed, do the procedure below.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Jun 16, 2009
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