So I installed a new IPR valve. Now it cranks but wont turn over. I read something about how the IPR valve has to be 'clocked" in the same exact position it was in when I took it out? Would this cause my truck not to turn over? Truck has never not started before.

When I tightened it down, it was not in exact position as the old one. If I wanted it in exact position as old one, it would have not been tightened correctly. I couldn't make one more full turn around. what do u think???

 

The solenoid on the IPR turns regardless. No such thing as clocking it to the same position. It's a plunger that moves in and out from an electromagnet. Are you sure you got the plug back on correctly? Do you have anything to read ICP?

 

I'm sure the plug is in nice and snug. I put the heat shield around the valve as well as put the velcro around the wire connector as it was before. All 3 connectors to injectors are plugged in and connected with the clip. All wire harnesses are connected. Hmmm......It cranks really nice, full battery power but it just won't start. It doesn't act like it's almost going to start either. It just cranks nicely. Almost seems like a fuel issue.

Truck at least started fine before I did this job. I will take the degas bottle off again and check to make sure my ficm harnesses are connected. I made sure they were all snapped in nicely and even tugged on them a little to be sure........any other help is appreciated.

 

And no i have nothing to test ICP sensor............what can i do?

 

Any black smoke while cranking?

 

No black smoke while cranking. The fuel injectors are not testing like they used too. I used to hear a click click rattle rattle with the injectors everytime i turned it on. I do not hear that anymore. All i changed was the IPR valve? Does IPR have anything to do with injectors buzzing?

Harness is connected to ficm. It is on tight and all 3 snapped in to place.

There was one thing i noticed when i got back there to replace the IPR. I noticed a wire of some sort that was connected to my injector harness that looked like it grounded out on the end of the valve cover on the driver side. what is this for? Anyone know? I put it back the same way.

All connectors on injectors are in good and clip in place. I dont get it. Its never done this.

 

That is the FICM ground and it goes on the rear most intake manifold bolt/stud.

 

Thank u. It is grounded correctly. Also, ficm is 48.5 key on, 48.7 cranking. Gotta b injector issue. I dont hear the clicking noise. Maybe soethinfs not connected??? I donno....I have looked over everything.

 

I also read somewhere that I must have enough IPR pressure to command the injectors to turn on? Can someone direct me to finding out if i have enough IPR pressure?

 

The ICP pressure must be greater than 500 PSI before it will command the injectors to fire. You will need gauges that read live data to see the ICP pressure and to diagnose no starts. Scan gauge II or one of the smartphone apps like dashboss for IOS devices or torque pro for android. What brought you to changing the IPR?

 

I changed IPR cause of stalling and rough idle. Had a few extra bucks and I knew the orginal owner hadn't replaced many things under the hood. He didn't have to. The EGR Valve was factory, IPR was factory, head gaskets were factory (shop told me), EGR Cooler had been replaced along with oil cooler, Head bolts were factory (again shop told me). I was very surprised to know this truck was one of the few and prob. It has not been abused. 160k miles when I bought it.

My next question is with the FICM. Id it's getting 48+ on key on and crank, is it good still? Or can this be my problem why I'm not hearing injectors buzzing/clicking and no fuel pump noise?

The FICM in my truck was replaced in '09.

 

and i am buying a scan guage II today. I will report my findings...

 

I'm not an expert at all but when you change the IPR valve you get some air into there and it needs to purge out. How long did you try cranking.

 

I tried cranking about 5 times. For about 6 sec max each time.....should I do longer? How do I get air out?

 

I would try cranking some more. That is the only way to get the air out. Keep a eye on your batteries and don't let them get too low.