2001 7.3 Intermittant no-start - Ford Powerstroke Diesel Forum
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Old 05-31-2013, 09:59 AM
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Question 2001 7.3 Intermittant no-start

Hey Gang

First time asking a technical question here. I've been lurking and learning alot over the past year or so. This is a great site with lots of info.

Forgive me if this has been answered before. I searched for the issue I'm having and only came up with a couple threads with issues similar to mine but the fix was never posted on the them.

I am intermittently having a problem with no-starts when the motor is warmed up. When I turn the key on, the WTS, CEL, and all the idiot lights on the left side of the instrument cluster stay lit (never turn off). Also, the tach jumps to 500 rpm and stays there without cranking the engine. Sometimes it will start fine when warmed. The truck starts perfectly when cool. I didn't have any starting issues this past winter.

I thought possibly CPS was going bad due to the 500rpm reading before starting so I changed that. Still won't start.
I do have a bit of oil in the IPR so I'll change that as well.

Oil and fuel filter have about 2000 miles on them.

Another thing that happens every once in a while is the truck will die randomly at varying cruise speeds. For example, it has died sitting at a stop light, slowing to stop at a stop light, and cruising at highway speeds. I have found that if the truck is moving when it dies, I can pump the fuel peddle once while still moving and it will fire back up on its own while still in gear.

Only mods I have on the truck is a SuperTunes Flashpaq running under performance setting. The tunes were installed well before I started having the dieing/no-start issues though. I've had the truck for 6 years without starting issues other than 2 failed starters. The truck has ~217K miles on it.

I'm going to pull fault codes here shortly...

Any ideas?

Thanks in advance!

~Chris
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Old 05-31-2013, 10:11 AM
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That all sounds like a bad CPS possibly you got another bad one out of the box, when you replaced it did it fix the problem of going 500 rpms without running?
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Old 05-31-2013, 10:38 AM
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Quote:
Originally Posted by Rammstein1224 View Post
That all sounds like a bad CPS possibly you got another bad one out of the box, when you replaced it did it fix the problem of going 500 rpms without running?
Yes and no. After I replaced the CPS I went for a ride down the highway and after I parked it and turned it off, it started right back up. My son drove it to school the next morning and it started fine after school. Yesterday, it wouldn't start again after a short trip across town. I let is cool off and it started right back up. Still have intermittent issue.

I just pulled the codes and the only one in there was a P1670 EF Signal not Detected...
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Old 05-31-2013, 10:42 AM
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I found this, it may help you
P1670 trouble code - PowerStrokeNation : Ford Powerstroke Diesel Forum
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Old 05-31-2013, 10:47 AM
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Originally Posted by Rammstein1224 View Post
Yup I found it as well.

I ran my batterys down while messing with the programmer so I slapped the charger on it until after work.

I'll do some checking and report what I find
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Old 05-31-2013, 10:56 AM
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Originally Posted by airconguru View Post
Yup I found it as well.

I ran my batterys down while messing with the programmer so I slapped the charger on it until after work.

I'll do some checking and report what I find
Sounds like you need some new batteries too, that that can cause some weird problems, i could probably use my programmer for 8 hours on end and it wont kill my batteries...maybe have your batteries tested?
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Old 05-31-2013, 11:34 AM
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Originally Posted by Rammstein1224 View Post
Sounds like you need some new batteries too, that that can cause some weird problems, i could probably use my programmer for 8 hours on end and it wont kill my batteries...maybe have your batteries tested?
The batteries are less than a year old. I think I drained them from the on/off requests of the programmer. I assume the glow plugs drained them. I'll get them checked though.
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Old 05-31-2013, 11:35 AM
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Originally Posted by airconguru View Post
The batteries are less than a year old. I think I drained them from the on/off requests of the programmer. I assume the glow plugs drained them. I'll get them checked though.
Oh ok yea that makes sense then i thought you meant you were just sitting with your programmer on looking up diagnostics. then the may not be the problem but it never hurts to test them
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Old 05-31-2013, 01:08 PM
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Even cycling the GP's a handful of times should not drain the batteries. I have probably cycled mine 20 times before actually starting the truck and there was no hesitation when cranking.

Have an auto parts store put a load test on them. Once you confirm that the batteries are good you can continue with diagnostics.
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Old 05-31-2013, 04:04 PM
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Ok. Here is some more diagnostic fun.

I get home from work and go right to the garage and start tinkering with the truck. Starts fine(of course) and I let her warm up. I check for codes while running and find nothing. I let the truck run fo a good 30 minutes to warm up and all is fine. I give her a little fuel running it up to around 2krpm and hold there a couple times. On the last time I do this, when I let off the fuel peddle, she dies. Tack goes right to 500 rpm, wts light comes on, and all idiot lights on the left light up. I plug the programmer back in and can't get it to communicate with the PCM....Ut Oh!

Faulty PCM?
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