hpop issue
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Join Date: Jun 2003
Location: Damon (South East Texas)
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Have you pulled the plug on the top of the hpop reservoir to very you do indeed have oil present? Not saying it's not the hpop, but read this first.
Here is a partial quote taken from another similar thread:
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.
Hook up the scantool, and monitor ICP PSI and ICP Duty Cycle %. 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.
Here is a partial quote taken from another similar thread:
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.
Hook up the scantool, and monitor ICP PSI and ICP Duty Cycle %. 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.
#4
#6
#7
Pull the cover to the HPOP drive bolt. See if the bolt for some reason has come loose? The HPOP drive gear is driven by the cam gear. If for some reason that bolt were to come loose, it would make the HPOP not turn.
The only other thing is if the IPR is stuck full open. That would keep the oil pressure from building too. This is more likely than the bolt being loose.
The only other thing is if the IPR is stuck full open. That would keep the oil pressure from building too. This is more likely than the bolt being loose.
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