Originally posted by Dave (Golfer) on PSN 01-20-2010 Thanks Dave
its nevvvvver the oil pump...seriously.
I see sooooooooooooooo many guys (dealerships included) that see "no ICP" or some ICP codes in a scantool...and toss HPOP's on truck after truck...when it is either an IPR or an injector (poppet valve) issue.
If you hook up the scantool, and monitor ICP (psi) while cranking...you'll see IPR% (duty cycle) climb & climb 15% key on..20, 30, 40, 55%, higher..the increase in IPR% means that the PCM is requesting ICP pressure to increase...
so ALSO watch ICP(psi) and if it comes up to only 180-250psi or so and stays there...then it's the IPR hung open (bypassing oil back to the oil pan through the front cover) such that only minimal psi can be made.
If the ICP is VERY low...like under 60psi...then it could be injector (poppets) pissing oil (under the VC's)..which is typical for injector with more than 180-200k miles.
if ICP climbs above 550-600..then it will probably climb much higher (15-1800+) and it is most likely going to be an electrical issue.
If his scantool will not connect then its a PCM or chip issue (remove the chip if you have one & haven't removed it yet)
if the scantool connects AND you have >600ICP then look at the datastream for a RPM reading.
if the scantool picks up an RPM signal and it seems accurate....then the CPS is good.
If no RPM on the scantool, replace CPS.
If you have RPM (on scantool, not just on dash)...AND have ICP >600, then run an (key on, eng off) injector "buzz test"...
the buzz test is nothing more than a continuity test from the PCM, through the IDM, and to & from each injector solenoid.
LISTEN to each inj buzz....do they all sound the same? nice & crisp?
if the test passes (and you audibly heard them all)...then wiring is good, IDM is good, HPOP is good...CPS is good...then it could be a fuel issue. gasoline, water, etc...
I wouldn't mention it if I haven't seen it myself numerous times...
any chance this no start began with 10-20miles after a fillup?