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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

Thread: 7.3 powerstroke won,t start Reply to Thread
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  Topic Review (Newest First)
08-06-2019 05:09 AM
Dallas97PSD The FORScan app can do a cylinder contribution test with the engine running at operating temperature, and tell you which of the cylinders is bad.
07-19-2019 10:36 AM
bugman To do it right you need a break out box that will shut down each injector individually.

But without one you can pull the valve cover and disconnect each injectors wiring and find it that way.
07-19-2019 03:47 AM
rayroof10
1995 F350 injector has a knocking sound

When l start my truck it has a knocking sound. Not bad but it's on passinger side and while driving you can,t hardly hear it. How do l locate which injector is bad. Thanks
07-19-2019 03:40 AM
rayroof10 Been awhile since I have been on here. On my 95 f350 that wouldn't start wound up changing out fuel pump and HPOP also the ipr valve. She's running like a champ. Thanks to everyone who helped me on this problem. This forum is the best. Thanks again.
04-22-2019 12:11 AM
Kimber1911
Quote:
Originally Posted by narmalee View Post
you need 50 minimum... 55-65 recommended, that's why we all switch to e-fuel, the factory m-pump SUCKS

We don't "all switch". My mechanical pump lasted 21 years. I changed it then only because it was easy to get to.
04-21-2019 05:34 PM
narmalee
Quote:
Originally Posted by rayroof10 View Post
Also have 26 psi fuel pressure . And no smoke out of tail pipe while cranking

you need 50 minimum... 55-65 recommended, that's why we all switch to e-fuel, the factory m-pump SUCKS
04-13-2019 10:24 AM
Patrick Feeley On the IPR, the Red wire is battery voltage and the Yellow/Red stripe wire is the ground (provided by the PCM when commanded). Cheers!
04-13-2019 10:22 AM
Kimber1911 I would also install a new cam position sensor, even if you do have tach movement at cranking. The CPS is inexpensive and easy to replace - plus you should always carry a spare with you.
04-13-2019 10:17 AM
Kimber1911 Are you 100% certain you got all the air purged from the high pressure oil system?

Are your batteries strong and topped-off?

Does your tach move slightly when cranking?

I would unplug the ICP and try to start again. It's a remote chance, but perhaps your new ICP is defective.

I would measure voltage at fuse 22 under the hood, and at the IPR harness - both with key on. Sorry, I don't know what the voltage at the IPR should read, but 22 should be battery voltage.

One of the two wires to the IPR will be a ground (obviously) - try to determine which. If you'll take that ground wire directly to the battery ground, you'll be applying maximum IPR pressure to the injectors. I would try to start it, and I would give it a small shot of ether.
04-12-2019 12:37 AM
rayroof10 Also have 26 psi fuel pressure . And no smoke out of tail pipe while cranking
04-12-2019 12:32 AM
rayroof10 Got back to working on my 95f350. I removed fuel bowl cleaned it all new O- rings screens new ipr and icp still no start
04-01-2019 12:06 PM
Kimber1911 I don't know what the pressure minimum is, but that sounds marginally-low to me.

1. Make certain you are drawing fuel from a tank that is at least half full. If/when the in-tank pickup tube breaks off or cracks, you will run out of fuel at about a quarter-tank. If your tube is cracked, you may be sucking air. Also switch tanks as you may have a tank selector issue.

2. Make certain you have a clean fuel filter. Drain the fuel bowl before you remove the old filter, and never fill the bowl manually. If you get trash on the clean side of the fuel system, you can clog an injector and there will be Hell to pay!

3. Remove the fuel pressure regulator. Inside, there's a wire screen about the size of a nickel. Make sure it is not clogged. If it is clogged, examine the trash closely, as any fuel that passes thru this screen has already been filtered. You may have a rubber fuel line that is breaking down inside and passing trash to the screen.

Also, if there is trash inside the regulator, it could be holding the little plastic ball open slightly. That can drop your pressure by allowing fuel to bipass back into the return line. Diesel o-rings . com has a rebuild kit for the fpr, and they post instructions on their website.

4. Your truck is an antique. You may have a clogged selector valve, clogged fuel lines, and/or clogged pickup tubes.
03-31-2019 09:01 PM
rayroof10 fuel pressure is around 25
03-31-2019 12:36 AM
Kimber1911 Maybe i can help `til Bugman gets back...

CHECK THE FUEL PRESSURE!!!

There...now Bugman doesn't have to yell at you
03-30-2019 07:46 PM
rayroof10 thank you for all your help, l do believe l am heading in right direction. a young man is coming down monday with a shop scanner, he runs a auto shop hopefully he can tell me something. again thank you.
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