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Old 03-28-2009, 04:46 PM
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boy scout camp truck

Hi this is my first post
1997 f 350 7.3
I am donating my labor trying to fix a porta john pump truck for a local boy scout camp.
first of all I am not very familiar with the 7.3
this truck idles a bit rough. has no power at all. allmost imposible to drive.
even at low speed in the camp.
I changed the fuel filter.
hooked up my snap on scanner found these codes
po344
po471
i cleared them and they did not return
I ran a inj buzz test it passed
did the balance test it also passed
a couple guys told me to check the plugs on the valve coveres they looked good.
I removed the pass side cover and looked inside it all looked good.
it allmost seems like I have no turbo boost
please any advice would be greatly appreciated
Ray

Last edited by rayw; 03-29-2009 at 04:28 PM.
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Old 03-28-2009, 04:48 PM
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posting a year may help yield a reasult
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Old 03-28-2009, 05:07 PM
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could try a CPS, that can cause all kinds of problems
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Old 03-28-2009, 05:07 PM
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Judging by your codes start with replacing the CPS and then do thisWelcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
These should take care of you
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Old 03-28-2009, 05:28 PM
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Quote:
Originally Posted by Dave View Post
Judging by your codes start with replacing the CPS and then do thisWelcome to guzzle's Exhaust Backpressure Sensor Cleaning Maintenance Web Page
These should take care of you

Do above.

Also, you need to check the exhaust up pipes to the turbo for soot as well as the firewall. Black soot in these areas means exhaust leaks. You won't have enough drive pressure to push the turbo. Pull the intake and check the turbo compressor fins for damage. Check all boost tube fittings, (intake/spider/plenum) make sure everything is tight (throw that in there due to the fact you didn't list the year model).
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Old 03-28-2009, 05:31 PM
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sorry guys it is a 97 f 350
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Old 03-28-2009, 06:13 PM
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+1 for the the CPS and checking the turbo
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Old 03-29-2009, 10:34 AM
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I went to the shop this morning and pulled the line for the ebs.
it was plugged bad
got it all cleaned out.
instaled it
then started the truck, it started hard and it was in a 70 deg shop all night.
it ran like crap for a while.
but I gained some on it. it does have a little bit more power once it gets the rpm up.
I also noticed it does not warm up much according to the temp gage.
I have not replaced the cps yet, if I need to do you guys recomend a ford part, or aftermarket ?
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Old 03-29-2009, 04:38 PM
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I went back to the shop after the nascar race.
I drove the truck a bit
then checked fuel pres at idle 47 psi
coolant temp does not get up past 1/4 on gage
still has a miss only noticable at idle

put scanner back on
new code po472 exh. pres. sensor low
as stated in last post I cleaned the ebs tube

i ran another buzz test it passed

I ran another contribution test I dont think I did the last one right
the test says
po269 cyl 3 cont bal fault
po272 cyl 4 cont bal faiult
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Old 03-29-2009, 04:51 PM
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Quote:
Originally Posted by rayw View Post
I went back to the shop after the nascar race.
I drove the truck a bit
then checked fuel pres at idle 47 psi
coolant temp does not get up past 1/4 on gage
still has a miss only noticable at idle

put scanner back on
new code po472 exh. pres. sensor low
as stated in last post I cleaned the ebs tube

i ran another buzz test it passed

I ran another contribution test I dont think I did the last one right
the test says
po269 cyl 3 cont bal fault
po272 cyl 4 cont bal faiult

Usually with a cont. bal fault the injector needs to be replaced for that cylinder.

If you would like I can come give you a hand with this.
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