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Old 07-21-2010, 03:20 AM
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PCM

how common is it for pcm to go bad
has anyone had experiance with this
how do you test to see if pcm is bad
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Old 07-21-2010, 06:54 AM
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Whoa,,, Dude, talk about a lack of information....

What year?

What engine?

What's it doing?

Yes a PCM can fail, but just as likely it could also be a fuse supplying the PCM.
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Old 07-22-2010, 11:43 AM
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Quote:
Originally Posted by NoRalPh View Post
Whoa,,, Dude, talk about a lack of information....

What year?

What engine?

What's it doing?

Yes a PCM can fail, but just as likely it could also be a fuse supplying the PCM.
2002 F350 7.3
will a pcm from 2K F250 7.3 work in a 2002 f350 7.3?
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Old 07-22-2010, 01:53 PM
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When you first roll the key ON - Do you have a WTS (Wait To Start) light?

Have you Double Checked fuse 30?

There is a sticker on the PCM itself (you'll have to remove it) with a specific number that has to be matched or cross referenced. You have to match the options of the truck (trans, 2/4WD, etc) for it to work I think.....
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Old 07-22-2010, 05:01 PM
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Quote:
Originally Posted by NoRalPh View Post
When you first roll the key ON - Do you have a WTS (Wait To Start) light?

Have you Double Checked fuse 30?

There is a sticker on the PCM itself (you'll have to remove it) with a specific number that has to be matched or cross referenced. You have to match the options of the truck (trans, 2/4WD, etc) for it to work I think.....
yes i have a wait to start light, and yes fuse 30 is good
dont know if you have background on problem so here goes
new icp sensor, cleaned ipr, fuel good, pressure 65psi, idles smooth,new cps,
ebpv open, turbo pressure good,wiring checks out

problem is no power from idle on up, truck will run up to 75
injection pressure runs up to 2200psi when you drive it
it does not seem like a fuel problem, but it seems like turbo is not boosting
do not have a boost guage so i cant check running boost pressure
will truck run if pcm is bad?
any ideas?
oh and thanks for your input and help it is greatly appreciated
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Old 07-22-2010, 05:24 PM
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If the PCM was dead (and in most cases, complex electronics like a PCM either work or don't work) it wouldn't run at all. The WTS is another sign that the PCM is Not dead.

The next PCM problem could be that it would benefit from a reflash but, you'd need to go to the dealership for that

Is the truck stock? Do you have a chip in there?

Can you hear anything from the turbo? You should be able to hear it whistle, especially over 2K-rpm going up a hill with your foot "in-it"...

How about a boost leak in the plumbing to and from the IC?

Do you have a lot of miles on it? Maybe a compression test?
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Old 07-23-2010, 04:09 AM
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Quote:
Originally Posted by NoRalPh View Post
If the PCM was dead (and in most cases, complex electronics like a PCM either work or don't work) it wouldn't run at all. The WTS is another sign that the PCM is Not dead.

The next PCM problem could be that it would benefit from a reflash but, you'd need to go to the dealership for that

Is the truck stock? Do you have a chip in there?

Can you hear anything from the turbo? You should be able to hear it whistle, especially over 2K-rpm going up a hill with your foot "in-it"...

How about a boost leak in the plumbing to and from the IC?

Do you have a lot of miles on it? Maybe a compression test?
no chip, if you take the boot from air cleaner off and put your hand across the intake it will almost suck your hand in it, 165k on truck, problem arose in about a weeks time gradually so i dont think it is compression ill check plumbing system
thanks
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