Ok, I have read a thousand posts regarding the Cam sensor and IPR Valve. I have a 02 F250 with 150,000 on the clock. Has stalled a couple of times. Replaced the cam sensor with a factory ford part. I have a super chips tuner that will read codes. No codes present. Yesterday, stalled several times on the way home from the stores. Wait about 15 - 20 minutes and it restarts. again no codes. When it stalls, turn the key, Check engine light comes on and goes through its self test. When you crank and no start there is no RPM tach movement. So the question is can an failed IPR cause a no RPM signal to the tach? I am willing to replace the IPR, but am concerned about the no RPM signal. I am the third owner and do not think the IPR has been replaced. I have read a lot of old posts and see some similar to mine. One post talks about the exact same issues and that he replaced the IPR and is ok now.

Thanks in advance.

 

Whether the tach moves isn't a good indicator of the cam position sensor working or not. Do you have any way to monitor live data while cranking? That's going to be your best bet for diagnosing this without throwing parts at it.

 

You could try cleaning the IPR (cost of a can of spray brake cleaner). That's what I did and my stalling quit. It had a lot of gunk in the bottom half that kept hanging the IPR open. Here's the step by step instructions from my build thread.

 

Tach isn't supposed to move while cranking on 2002 trucks. This is normal operation.


Next time it stalls, crank for 15-20 seconds. That will set a code. Most likely it's the IPR. The fact that you let it sit and cool for a while then it starts like normal is a dead giveaway. A 15-20 second crank time will set an ICP code for low oil pressure if it's in fact a sticking IPR.