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1994.5 - 1997 7.3L Power Stroke Diesel  

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Old Feb 19, 2007 | 05:40 PM
  #1  
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check engine

97 psd 249K bout two months ago while towing on the open road old reliable suddenly lost power and the check engine light came on....I pulled of the road the truck was idleing fine...stratched head for a bit...gauges all fine...cut switch off...sat for a minute...fired her up... and all was well....light off and everything.....since then have replaced fuel filter housing assembly (ford parts)..fuel pump...(also ford)....both batteries...serpentine belt.......getting ready for a long trip........and damn if she didn't pull the check engine trick this afternoon......got home and plugged my code checker in........nothing.......have been running the superchips module on towing for app. 150K....turned it back stock and still found no codes on it either.......any suggestions??
 
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Old Feb 19, 2007 | 06:38 PM
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How about the CPS?
I'm not familiar with the superchips. Is it a plug in? If so unplug it.
Did you lose power when the light came on this time?
 
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Old Feb 19, 2007 | 07:15 PM
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yep......it did lose power again..wouldn't get above 2k rpm......I have set the computer back to stock via the superchips controller......it also reads fault codes.....didn't see any this time either.......weird.......when it happens....shut her off......start her up again.....all is well........
 
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Old Feb 19, 2007 | 07:52 PM
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Might look at your accelerator position sensor. Its at the top of the pedal.
 
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Old Jun 20, 2007 | 04:41 PM
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Did you ever figure out the problem.
I have a 94.5 that does the same thing.
No codes are ever thrown & no superchips or anything like that.
 
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Old Jun 20, 2007 | 08:57 PM
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Sounds CPS related.

Cowboy Steve
 
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Old Jun 20, 2007 | 10:51 PM
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wondered if that was it.
Am ordering it & hope it will correct problem.
Will let you know & if anyone else has anything let me know.
thanks
 
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Old Jun 26, 2007 | 10:14 PM
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put a brand new oem cps in and did nothing.
just turns over & over.
obd scanner turns up no codes.
any ideas?
 
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Old Jun 27, 2007 | 05:26 AM
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OBD scanners might not work. I have tried them on my 96 and 97 and they didn't work on either one. Are you saying it does not start at all? Did you check all the fuses, under hood and under dash?
 
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Old Jun 27, 2007 | 08:36 AM
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will not start at all.

sounds like when you turn a gas motor over with no fire.

have not checked fuses, will do that and disconnect battery to reset everything.
 
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Old Jun 27, 2007 | 08:55 AM
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You may have a shorted fuel heater. It will fry a fuse, but don't remember which one off hand. Did this happen all of a sudden, or did it run bad for a while and then quit?
 
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Old Jun 27, 2007 | 09:21 AM
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When you check fuses use a test light. It makes it quicker and easier and eliminates the fact that a fuse is bad but looks good. That will happen from time to time.
 
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Old Jun 27, 2007 | 10:49 AM
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First off- Thank YOu all so much for your great input & help. This place is really great.


Now I am screwing myself up here explaining this to you.

The 1994 fsuperduty, I have not got a cps in yet.

I have a 1999 f350 that just up and died at the stop sign coming off the interstate. Figured it was the cps. put it in yesterday & that is the one my previous last 2 replys are for.
I will check the fuses and reset the battery on the 1999 also.

Am still waiting on the cps for the 1994.

thanks again for all your help.
 
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