Yup,, sorry ,, my bad....We are all ears ...(eyes)...

 

pretty much my problem is that i have way too much oil going to the injectors, has a really hi idile and when i drive it down the road it makes this terrible screetching noise thats sounds like its going to explode. when i unplug the ipr valve connector, it starts up and does the same thing. i just replaced the oil pump and ipr valve, does that mean my ipr valve is stuck?? also the SIGNAL Y/R on koeo is suppose to be between 0 and .25 volts, mine is .35 volts and says if it is above that, it grounded itself to vref but dont know what vref is..... Thanks Guys for your help its been acouple months trying to figure this thing out!! the icp is new by the way and cam sensor......

 

Try unplugging the ICP and start it.
(Injection Control Pressure) on front of the driverside head.

You may have some bad info.
You should be getting .5V or less...see below

vref= (B+) Battery voltage in this case. Most other sensors are 4.5 - 5.0v

You said it has too much oil to the injectors..
Have you checked the HPOP pressure with a gage?
Should be

If the IPR is stuck the CEL should be lit.
Have you scanned it for codes?

This is just a guess....Check the IVS (Idle Validation Switch). It's located on the gas pedal. It should have no continuity at idle.


__________________________________________________ ______

A= Red wire
B= Yellow w/red


<TABLE cellSpacing=0 cellPadding=3 border=1><CAPTION>HARNESS CONNECTOR CHECKS TO GROUND (B-)

(CHECK WITH IPR CONNECTOR DISCONNECTED AND IGNITION KEY OFF, ALL ACCESSORIES OFF)
</CAPTION><TBODY><TR><TH vAlign=bottom align=middle>Test Points </TH><TH vAlign=bottom align=middle>Spec. </TH><TH vAlign=bottom align=middle>Comments </TH></TR><TR><TD vAlign=top align=middle>A to Grd </TD><TD vAlign=top align=middle>>5 ohms </TD><TD vAlign=top align=left>If 5 ohms or less, the harness is shorted to ground </TD></TR><TR><TD vAlign=top align=middle>B to Grd </TD><TD vAlign=top align=middle>>5 ohms </TD><TD vAlign=top align=left>A short to ground will command full IPR pressure </TD></TR></TBODY></TABLE>




<TABLE cellSpacing=0 cellPadding=3 border=1><CAPTION>IPR VOLTAGE CHECK

(CHECK WITH REGULATOR CONNECTOR DISCONNECTED)
</CAPTION><TBODY><TR><TH vAlign=bottom align=middle>Test Points </TH><TH vAlign=bottom align=middle>Spec. </TH><TH vAlign=bottom align=middle>Comments </TH></TR><TR><TD vAlign=top align=middle>A to Grd </TD><TD vAlign=top align=middle>B+ </TD><TD vAlign=top align=left>Battery voltage from PCM relay; check with key on </TD></TR><TR><TD vAlign=top align=middle>B to Grd </TD><TD vAlign=top align=middle>0-.5 v </TD><TD vAlign=top align=left>If greater than .5 volts signal wire is shorted to VREF or battery </TD></TR></TBODY></TABLE>

 

..I'll assume it was the HPOP that was replaced ,, Also , what year truck is it?...

You may need to take a look at the routing of the wiring as it runs up to the IPR......

 

Sounds like a possible wiring or pcm issue. Also the hpop is new/rebuilt, but it can be defective (clogged screen).
The sound you hear might be the HPOP relief valve blowing off the pressure.

Bill

 

Have you verified HPOP pressure with a gauge or scanner with live readings?

 

its a 95 and the code p1211 comes up saying the injector control pressure is above/below desired amount. the pressure at idle is 2455 psi from the icp. when i disconnect the icp it still starts up the same way...even with the ipr valve disconnected... the pump is new and i got one before this one that did not work so sent it back and they sent me this one that works alot better....i replaced the pcm because i thought it was sending a wrong signal so the pcm is good....

 

Disconnect the IPR connector and ohm the Y w/Red wire on the connector to ground, it should be less than 5 ohms. IF it's shorted to ground will command full IPR pressure. If so, check the big wire harness running over the driverside valve cover for chaffing.

Are you getting a new IPR valve on each pump? If not it may be hanging up.
Idle pressure Should be 550-700psi.

Do you have an modifications to the engine? ie. Programmer, chip, 10K mod ect.
If so, remove/disconnect them.

 

Something is restricting the path to the drain,, Edge filter or the IPR stuck ,,,

If you replaced the IPR , did you get the correct one?

Also , what started all of this ?...why change the pump?

Look .....here....

 

The original pump went out so I had to get another pump. Was getting enough pressure for startup and lost power for about a month until it finally died. Ipr is the correct one for the pump. Do I need to take the pump out again and check if there is something blocking it?? This pump had a weird thing in the drain hole for the ipr than the other pump that I had…..is it not letting it drain as much as it should be or am I not getting a good connection between the ipr itself and the connector. I have checked the harness and everything tests out fine, ipr connect resealed, I get the right amount of voltage at the connector from the computer soooo……just a real loss and its pissing me off…..

 

If the electric part checks out then the HPOP needs to come off.
You can not check the signal voltage with VOM.
Did you do the ohm check I posted above?

I'm not sure if you can clear the restriction in the drain path if it's blocked.

Can you post a picture of the weird thing you saw in the IPR port? I have a new HPOP sitting on the bench I'll take a look if there is anything in there.

 

yes i will take a pic of it....checked the ohms and it is within range.... there is a metal part that looks like a screen thing in the output where the oil is released from the ipr valve....i did have a programmer on it but its disconnected and everything....would the injectors not put out as much fuel if the oil pressure is lower?? when the ipr valve becomes unplugged, is the engine suppose to die?? cuda_jim, what year is your truck?

 

Yes ,,, if it stays running , usually , the IPR is stuck , Or the drain path to the crankase is plugged (edge filter)...IPR DC % will be low (maybe 8 %) or so.....

 

edo, my truck is a 96. The HPOP I have on the bench is a 96 too, it's different than yours. You have a check valve in the HPOP vs. in the reservior. I'll try to get a pict for you anyway.

 

I would also like to see a pict of what is in the pump.
Possible a shipping seal?

Bill