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post #1 of 18 Old 04-03-2012, 05:20 PM Thread Starter
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Who knows their stuff....?

Riddle me this...

AE keeps throwing a P0284 #8 contribution/balance fault when I do the cylinder contribution test. I've done it multiple times now. I started the test during each start up and the truck would romp like it has a big cam in it. Finally smoothed out and when the test completed my 'service engine soon' light went out and my idle changed... What the heck am I dealing with here? lol

Additional info:
Knocking, possible #8?

01 7.3 117k miles on the odo.

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
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ISSPRO Boost, Pyro, and Trans Gauges
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Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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post #2 of 18 Old 04-03-2012, 05:22 PM
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CPS will throw that code sometimes.
The romp is usually because the #6 injector fires right before #8, depleting the oil and fuel rail for the #8, hence the reason for the "long lead" injector. The romp will happen to me when the motor is pretty cold. That's cause the oil is really thick and the HPOP has a hard time replenishing the HPO rail in time for the #8 SOI event.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 18 Old 04-03-2012, 05:42 PM
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you have the grey cps aparently. it will do that.

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post #4 of 18 Old 04-03-2012, 06:05 PM Thread Starter
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I've ran the cylinder contribution test more times than I can count and it keeps throwing #8. Could that still be a CPS issue?

The dealership did the CPS under recall or something. PO hadn't done it so I took it in and had it done. Which CPS do I need to get to solve this problem? Will this issue also be intermittent?

I just came back from running the crap out of the truck and it threw a P0269 Cylinder #3 contribution/balance fault. The #3 exhaust port is also cooler than the rest on the passenger, sign of a bad injector I presume?

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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post #5 of 18 Old 04-03-2012, 06:23 PM
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i had a black cps and it fixed my cct errors.

2006 Ford F250 CCSB FX4 6.0




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post #6 of 18 Old 04-03-2012, 06:24 PM
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Black, Grey, & Dark Blue Cam Position Sensor Perdels Test - Diesel Forum - TheDieselStop.com
GOOD read about the CPS issues.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #7 of 18 Old 04-03-2012, 06:46 PM Thread Starter
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Quote:
Originally Posted by Jarrod B View Post
i had a black cps and it fixed my cct errors.
Did your truck throw more than one? This is the first time it's thrown the #3.

Also, is the black CPS the 'fix' CPS? I'm reading the thread and it appears I just have the 'recall' CPS in right now?

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6

Last edited by Toms01PSD; 04-03-2012 at 06:52 PM.
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post #8 of 18 Old 04-03-2012, 06:48 PM
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it was always #8.

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post #9 of 18 Old 04-03-2012, 08:12 PM Thread Starter
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Quote:
Originally Posted by Jarrod B View Post
it was always #8.
So how does #3 get thrown in the mix? I'll try a new CPS and see what happens I guess.

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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post #10 of 18 Old 04-03-2012, 08:32 PM Thread Starter
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Quote:
Originally Posted by jesilvas View Post
CPS will throw that code sometimes.
The romp is usually because the #6 injector fires right before #8, depleting the oil and fuel rail for the #8, hence the reason for the "long lead" injector. The romp will happen to me when the motor is pretty cold. That's cause the oil is really thick and the HPOP has a hard time replenishing the HPO rail in time for the #8 SOI event.
I forgot to mention, 75+ degrees isn't exactly a cold start. It has also done it when i've started it, let it run for 5 seconds, shut it off, and re-started.

Tom
2001 F250 7.3 auto 4x4 Lariat CCSB
6637 intake
4" MBRP exhaust
PHP tunes
Foil delete
EBPV delete
ISSPRO Boost, Pyro, and Trans Gauges
Strictly Diesel Pre-Pump Filter/In-Tank Kit
Strictly Diesel Regulated Return and Fuel Bowl Delete
High Flow Banjo Bolts
Nitto AT's 305/70R16
2009 Pontiac G8 GT
Intake, Exhaust, Tune
Camaro 20's, Camaro SS Brembo's
1997 VDub Passat GLX VR6
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