95 7.3 i have new injectors, uvc wiring,valve cover gaskets,pigtails,idm,pcm,icp,cps,hpop,ipr. reservoir is full oil rail in head has pressure but no start no oil discharge from injectors any suggestions or ideas? thanks Steve

 

check fuses and did you tighten up the bolt on the wiring harness when you but the pcm in when i did my chip i didn't tighten the bolt and truck wouldn't start

 

Does the Wait to start light come on with the key? Any movement in the Tach while cranking? Any smoke out the tail pipe?

Do you have a scanner? If so what kind? Any codes?

Were these part replaced to fix a problem and if so what was it?

 

pcm bolt snuged up fuses good wts light comes on tach needle moves up some when turning engine over a few times it started and ran for a few minutes lot of white smoke at first it has been scanned twice first time i towed it to dealer they said lost oil pressure under valve cover then i replaced injectors & wiring still no start ford mech came out scanned it again said pcm failed then i replaced pcm,idm,

 

Have you had it running since you changed the hpop? You're sure the gear it tight on the shaft? How much oil pressure do you have at the oil rail?

 

the day the trouble started i took it in to shop to get 1 injector replaced ran great for 1/4 mile quit running shop said hpop went out replaced ipop& ipr ran for 2-3 weeks quit again that when ford scanned it & said pressure loss under valve cover ifound stuck injector replaced all injectors dont know what pressure is at rail when i pull rail plug it has some pressure

 

Did the tin nut fall off the back of the new IPR? You should have more than "some pressure" at the head. More in the neighborhood of 500 psi. Do you know anyone with a scanner that can monitor ICP psi & IPR % while cranking?

Sounds like you need to find someone who is willing to find the problem instead of just throwing parts at it. For about $350 you can get your own scanner and try to figure this out yourself.

 

the nut your talking about is external? i have thought buying a scanner what is a good one & will it do buzz test?

 

AE is the popular scanner if you have a laptop. Dennis has the best pricing on this AutoEnginuity PC Scan Tool (USB)

Yes it will do a buzz test, contribution test, KOEO, KOER, switch test, live data monitoring, data logging, pull & clear codes, etc.

The tin nut is external and sits on the end of the IPR (the side pointed toward the cab) It's been known to come loose or fall off, which will make the IPR quit working and you'll end up with no oil pressure in the heads.

 

i am looking for a good scanner that does buzz test anybody know which ones are good?

 

thanks for the info i looked it over i am going to order one it is better for the price than any i have seen thanks Steve

 

FWIW, Buzz Test is useless except to possibly check IDM, won't tell you a darn thing about the injectors. Your motor can pass buzz test without any injectors in it.
Scanning software is helpful to pull codes and to do a Cylinder Contribution Test to determine which injectors aren't firing. But most scanners need to have motor up to at least 160* to do the test. Scanning software won't tell you why the truck won't start, only pull codes.

Good luck.

 

OK, I'll bite. If you remove all the injectors from your truck and perform a buzz test, exactly what is going to buzz?

I agree the buzz test does not check all of the injector, but are you not of the opinion that a weak buzz could indicate a sticking poppet if you're chasing a cold start/running issue? A weak buzz usually means it's time to find a shop to buy an injector(s).

 

Here is a picture that shows where the tin nut is located. It down where the IPR is labeled.


These are some of the worst issues to diagnose since you have had so many parts replaced by different shops. So just so I understand this, it has started and ran recently just won't stay running?

Check the engine oil level on the dip stick. Make sure it is completely full. Also make sure the fuel bowl is full of fuel and while cranking the engine over check for fuel pressure at the schrader valve on the side of the fuel filter housing.

 

i checked nut on ipr still there & tight. it did start once after installing injectors ran for 2-3 minutes lot of white smoke & fuel knock it shut off it has almost started a few times i have valve covers off when i see oil discharge from injectors it tries to start