Cummins guy lost on 7.3 Many Issues? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 19 (permalink) Old 07-09-2010, 04:19 AM Thread Starter
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Cummins guy lost on 7.3 Many Issues?

Alright lets see here.

This is my neighbors truck.

2001 F350 CCLB DRW XLT 7.3L/4R100 4.10 78K
He has some oil leaks fixed when he got it. I do know that one was a Cam sensor leaking.

It started smoking white on start up so he took it in to a diesel shop, Same shop has done work for me and did great work.

They Replaced the #8 Injector. ( No smoke for a couple days)
It started smoking again. went back to same shop.
Before it went back we took a snap-on scan tool and did buzz testing on the sticks. ( Passed they all sounded good) then Cylinder Contribution Test. It says #8 out of threshold ( however it words it) Would it think because it was a new injector that its bad or could 1-7 be bad and it show that one cause it is different/newer?

Shop tests and finds no issue so they try a new Glow Plug in #8. still smokes so they put another new injector in it. ( they say no smoke)

He gets it home and a couple days later smoke it back.

Now ( maybe past week)

When the truck is cold hasn't ran for a day or so it starts and runs find for like 15-30 sec and shakes for 10-20 secs then runs perfect. ( still smokes a on start up.)

Now the list of what people say could be wrong with it.
injector O-ring ( I believe this could be the case due to the truck sitting alot before)

Injectors ( one or all)
Glow plugs ( one or all )
ECM on its way out
Fuel blow cracked
HPOP

Now and I missing anything. and what can I check/ test to prove anything. After the truck runs for about 1-3 mins it is totally fine. runs fine, doesn't fall on its face if you hammer it NOTHING> So can someone educate the Cummins guy who doesn't was it admit defeat.

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post #2 of 19 (permalink) Old 07-09-2010, 12:34 PM
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Pull #8 and check/replace the o-rings, but before you get that deep, make certain the UVC harnesses are properly plugged in as well.

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post #3 of 19 (permalink) Old 07-09-2010, 03:12 PM
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Ignore the cylinder contribution test. Since he recently replaced the CPS, then he's running an redesigned CPS rather than the original. The new CPS's often throw failures on cylinder #8, and sometimes #3. Basically the shop needs to quit swapping the #8 injector. It's just wasting money and time chasing a ghost problem. I'm willing to bet there was absolutely nothing wrong with the original #8 injector.

Now how much smoke are we talking here? You say after a minute or so the truck is fine. Give me an idea of how much it smokes when the engine is cold. Mine will sometimes puff out a wee bit of white smoke after it's sat for a day or so. It's always done this ever since I first bought it.

Lastly, is the truck using oil?
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post #4 of 19 (permalink) Old 07-10-2010, 05:42 PM
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what is a cps? I don't think they replaced anything but the injector.

Ryan
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post #5 of 19 (permalink) Old 07-10-2010, 05:59 PM
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cam positioning sensor
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post #6 of 19 (permalink) Old 07-10-2010, 06:41 PM Thread Starter
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Quote:
Originally Posted by ryanmc View Post
what is a cps? I don't think they replaced anything but the injector.
Sorry Ryan I thought at one point a glow plug was brought up.

So a cam position sensor (CPS) ... may be worth a shot.

"Only accurate rifles are interesting" -Townsend Whelen

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post #7 of 19 (permalink) Old 07-11-2010, 07:46 PM Thread Starter
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Quote:
Originally Posted by Pocket View Post
Ignore the cylinder contribution test. Since he recently replaced the CPS, then he's running an redesigned CPS rather than the original. The new CPS's often throw failures on cylinder #8, and sometimes #3. Basically the shop needs to quit swapping the #8 injector. It's just wasting money and time chasing a ghost problem. I'm willing to bet there was absolutely nothing wrong with the original #8 injector.

Now how much smoke are we talking here? You say after a minute or so the truck is fine. Give me an idea of how much it smokes when the engine is cold. Mine will sometimes puff out a wee bit of white smoke after it's sat for a day or so. It's always done this ever since I first bought it.

Lastly, is the truck using oil?
I believe that the CPS only had a gasket replaced. Are you saying that the CPS went bad or what, as far as we know its the original OEM CPS.

"Only accurate rifles are interesting" -Townsend Whelen

2012 Ram 2500 Crew Cab Big Horn
6.7L 68RFE 4wd
Yeah its stock.
Edge Insight CTS / Line-X / Access Bed Cover
B&W Turnover Ball / Companion Hitch
Pac Brake Air Bags
On Board Air
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post #8 of 19 (permalink) Old 07-12-2010, 03:58 AM
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There's no "gasket" to replace on the CPS - the cam position sensor has an o-ring, but I've never heard of a bad o-ring being an issue on a CPS.

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post #9 of 19 (permalink) Old 07-12-2010, 04:57 AM
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i agree with pocket, sounds like it could be a cam sensor. let us know what you find, the sensor should be les than $30

99.5 F250, VGT 5.9 CR cummins
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post #10 of 19 (permalink) Old 07-12-2010, 02:56 PM
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Quote:
Originally Posted by neeltburn View Post
I believe that the CPS only had a gasket replaced. Are you saying that the CPS went bad or what, as far as we know its the original OEM CPS.
Original OEM CPS's are black in color. If it isn't black now, it isn't original.

The recall for the CPS has been active for a few years now. Since your friend bought the truck used, the previous owner could have had the recall done.

The recall CPS (updated CPS) is grey in color. The problem with the new style CPS is false CCT failures, typically on #8 cylinder, and often on #3 as well.

Now these CPS's do not cause smoke. That's why in my previous post I asked how much the truck is smoking, and if it's using oil. Basically you can ignore the CCT failure on #8, and have your friend quit wasting time and money swapping out injectors.
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