WEIRD IDLE AND STARTING

[ALVIN73]

Could someone please post h.p. oil presure and fuel presure at cranking , my 96starts hard when a little cold and does this funny idle at slow idle like running every other cly. or if you drop the throttle quick. has had glow plugs, cover gaskets and harnesses, oil change, runs great other wise. THANKS MUCH

[BigFuel]

You replaced the glow plugs but have you replaced the glow plug relay? Those die too. I've seen cranking HPO get to about 700psi. Not great but it worked. Below 50 the glow plug system is quite important. Below 30, start using your block heater.

[ALVIN73]

Thanks for the reply! Sorry yes the relay was replaced, I have GP power to VC gasket connector. I have a Snapon 2500 comp., had it on when driving to work & back if I remember right HP pump reading went down to 300# area at idle which I thought was low. I am used to working on bigger and older diesels, just got it in july and was told this is a old problem but got it for a song. It is a 96 f250 1 ton susp. 5 speed EXT. cab 4x4, nice shape for year and area. THANKS ALVIN73

[BigFuel]

At idle the HPOP should not be reporting less than 600# of pressure (3000# at WOT). Sounds like you've got a weak set-up in yours. If you can find at a wrecking yard a Super Duty take its instead of buying a new one for the OBS. For that matter don't buy one for the OBS at all. A great upgrade is the T500 HPOP from Terminator engineering. Not much more than a rebuilt unit for our trucks. The ICP is a HPOP pressure controller on the drivers side head near the front of the engine. With the truck off unplug the sensor and disconnect the wiring to the ICP. Does the truck run better?

[MoFo]

Originally Posted by ALVIN73

Thanks for the reply! Sorry yes the relay was replaced, I have GP power to VC gasket connector. I have a Snapon 2500 comp., had it on when driving to work & back if I remember right HP pump reading went down to 300# area at idle which I thought was low. I am used to working on bigger and older diesels, just got it in july and was told this is a old problem but got it for a song. It is a 96 f250 1 ton susp. 5 speed EXT. cab 4x4, nice shape for year and area. THANKS ALVIN73

Having the exact same problem, used to be the motor would jump out of the engine bay it starts and has a very low idle any where from 575 RPM to 675. Have replace GP/GPR Driver side UVCH. Can't understand it, the truck did sit for about 11 weeks in the paint shop. Today it was about 45 and a ton of white smoke upon start. Disconnected ICP to see if it helped but didn't.
1996 F350 7.3 PSD XLT CC 8' Bed 4" Turbo Back 262000 miles

Any ideas would greatly be appreciated.

Thanks MoFo

[ALVIN73]

Originally Posted by BigFuel

At idle the HPOP should not be reporting less than 600# of pressure (3000# at WOT). Sounds like you've got a weak set-up in yours. If you can find at a wrecking yard a Super Duty take its instead of buying a new one for the OBS. For that matter don't buy one for the OBS at all. A great upgrade is the T500 HPOP from Terminator engineering. Not much more than a rebuilt unit for our trucks. The ICP is a HPOP pressure controller on the drivers side head near the front of the engine. With the truck off unplug the sensor and disconnect the wiring to the ICP. Does the truck run better?

Thanks for the reply, I check the HPOP and had about 1300# cranking, a couple of times when it was around 40 deg. fire up and ran fine, also I think it is IAP is on the scanner that is 0% and and 0 PSI can not find acronnim for it THANK ALVIN73

[BigFuel]

Sorry, not familiar with IAP?