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Old 03-19-2012, 03:31 PM
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Got a new problem today, input please

Today I installed my FRx, and HPx. Went very smooth. The square head plugs came right out, no problem. I happened to have a square head 3/8" drive socket, so lucky me. The hardest part of it all for me any way was just grinding that little bit down because it's a e99. Installed the recommended GOLD spring. Took the opportunity to paint the tubes and spyder as well. Got it all back together, checked for leaks and took it for a test drive.

Fuel pressure is up. Was 70 idle, 65 wot, now is 76 idle, 70 wot. Is this ok or too high? I can put the lighter spring in if need be.


The real problem, the truck was bucking hard under throttle, and then I pulled into a lot to double check for leaks, and it wouldn't restart. Took about 5 mins on and off cranking to finally start. Then on the way home, no more bucking. My gut says CPS, but I wanted some input first. I have never replaced it, and I know ford has never done it.

Is there any way to test for a bad CPS, other than to just put a new one in? Also, I recall there being a gray, black and I think blue one. Is one better than the other, or what?

Edit: here are some pics to help you think!







Last edited by venturesomerite; 03-19-2012 at 04:20 PM.
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Old 03-19-2012, 04:16 PM
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Black is the original CPS, grey is the new one, never heard of green. If you have never done it, put in a new grey one, their only $15.00 not sure if this is your problem, but can't hurt.
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Old 03-19-2012, 04:20 PM
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Edited: meant to say blue, but that also doesn't mean I'm not making that up.
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Old 03-19-2012, 04:30 PM
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Is the tach moving when you try to start it?
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Old 03-19-2012, 04:36 PM
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I did not take notice. If it does it again I'll have to check.
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Old 03-21-2012, 06:31 AM
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Ok, went to go to my shop today and I made it an astounding 20 feet down the drive way before stalling out and now she won't start. No CEL. Took a vid:




All input welcome.
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Old 03-21-2012, 07:14 AM
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Ok, got a new CPS, and it still won't start.


What else can I check?
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Old 03-21-2012, 08:02 AM
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check fuel pressure at the bowl (above 40psi), get a good scanner and watch the vitals while cranking:
ICP >500psi,
IPR<20%,
NO IDM CODES,
oil level correct (full/clean)?,
fuel level correct (above 1/2 tank)?,
fuel filter in good shape?,
UVCH's plugged in tight?,
let us know what you find
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Old 03-21-2012, 08:19 AM
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I'd start by confirming you are getting fuel. I know you say you see fuel pressure but, it sounds defueled to me.

Is there fuel in the fuel bowl now? Does it refill after cranking? (open the drain level to check)
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Old 03-21-2012, 08:42 AM
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I had a problem like this before, it turned out to be a loose connector on the top of the motor by the turbo for me. Threw some dielectric grease in there and she was all good to go
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