Cylinder contribution test 95 PSD? - Ford Powerstroke Diesel Forum

 
LinkBack Thread Tools Display Modes
post #1 of 10 Old 12-27-2007, 06:21 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Dec 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Cylinder contribution test 95 PSD?

I have a 95 PSD in an F450 that has at least one bad injector in it. The Contribution test always passes, even after 10 consecutive runs, with a definite miss in the engine. When the first part of the test initiates, the test drops one cyl at a time (or so it seems to do that). some cylinders show a drastic change, while one or two show little change at all.

The problem injectors i am looking for, arent totally dead, but miss at idle and under 1800 RPM, especially when hot. I was wondering if anyone knew if the cylinder contribution test was run in any specific order? If it is then I can go after the next injector, or possibly Orings that are bad, by listening to the one that doesnt change as much as the others.

I would assume that in 95 the ECM was new enough that this test wasnt totally de bugged. The only other way that i can think of is puling the valve covers and pulling injector wires one at a time, which I think I did a few years back to find the bad units. This was a messy ordeal as I remember.
cdk4219 is offline  
post #2 of 10 Old 12-28-2007, 06:04 PM
BIG TRUCK, SMALL DRIVER
 
pipelayerjdh's Avatar
 
Join Date: Oct 2006
Location: Iva, SC
Posts: 5,877
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I'm not sure what order they go in, but here's a bump.

Derrick

My photobucket




'97 F-350 "FORDOR" 4X4 (Dually Conversion, Shackle Reversal, Technicooler , Auto Meter Gauges, 4" DIY Dual Exhaust w/ '08 tips, 4" DIY intake w/ AEM filter, Wicked Wheel 2, 360° thrust bearing, Homemade E-fuel conversion, Wildman Chip, 160cc DIY injectors , DIY IDM mod) 230K and counting...
pipelayerjdh is offline  
post #3 of 10 Old 12-28-2007, 07:33 PM
Compression Ignition Addict
 
adfields's Avatar
 
Join Date: Nov 2007
Location: Palmer Alaska
Posts: 683
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I would think they would go in the firring order. Why would they bother to write new program to test in some other order. But what do I know, it could be 1-2-3, and the programmer never saw a motor. Good luck with this one.

ANDY

My baby is a one of a kind.
1977 I bought a new 76 F150 club cab.
Sitting on a 84 F350 6.9 4X4 chassis
With all the drive train and goodies from a 95 4X4 4door PSD.
Nothing stock left on her and not a nut, bolt, hose, or wire on there that I didn't put where it is.

The Wifes Ride:
2002 Excursion Limited 7.3 PSD

Themo King/Mikuni coolant heaters on both to keep things toasty without idling.
adfields is offline  
post #4 of 10 Old 12-28-2007, 07:48 PM
ADMIN AND TECH


 
SCUFFY828's Avatar
 
Join Date: Oct 2006
Location: winston salem north carolina
Posts: 9,314
Thanks: 0
Thanked 11 Times in 11 Posts
Mentioned: 0 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
the cylinder contributiuon test is run 1 2 3 4 5 6 7 8 , not by the firing order ,the easiest but messiest way if you dont have the correct equipment to run a cont. test is to remove one wire a a time to eliminate cyl. like you were saying

SCUFFY828@POWERSTROKE.ORG
ITS STOCK
SCUFFY828 is offline  
post #5 of 10 Old 12-29-2007, 07:37 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Dec 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks for the reply, I will do my best to find the faulty one(s).
cdk4219 is offline  
post #6 of 10 Old 12-29-2007, 07:46 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Dec 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I actually have 2 scan tools, a Snap on and a Mac (OTC style) which will both perform the cont test. The 95 PCM just wont pick it up, even though the miss is there.

On another note, does anyone know if there is a thread showing the Datastream parameters for the 95 PCM? I think that the truck has been down on power, and I have the ability to check this data, but dont know where the data numbers are supposed to be.
cdk4219 is offline  
post #7 of 10 Old 12-29-2007, 09:32 AM
Compression Ignition Addict
 
adfields's Avatar
 
Join Date: Nov 2007
Location: Palmer Alaska
Posts: 683
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
You could try Alldata if you have an account. I was looking for something and came upon a bulletin on bringing all 94/95 pcm's to post 96 values due to rough idle and hard start issues. Sounds like Ford has a CDrom for doing this.

ANDY

My baby is a one of a kind.
1977 I bought a new 76 F150 club cab.
Sitting on a 84 F350 6.9 4X4 chassis
With all the drive train and goodies from a 95 4X4 4door PSD.
Nothing stock left on her and not a nut, bolt, hose, or wire on there that I didn't put where it is.

The Wifes Ride:
2002 Excursion Limited 7.3 PSD

Themo King/Mikuni coolant heaters on both to keep things toasty without idling.
adfields is offline  
post #8 of 10 Old 12-29-2007, 09:41 AM
Premium Member
 
Join Date: Sep 2007
Posts: 108
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
There was a PCM reflash for the 95 PCM that changed the startegy for the cont test, which gave better results at pinpointing an offending cylinder. If you are passing the cont test, but it only sounds like it is making a single pass, you don't have the update installed. BTW, it runs the test from 1 through 8, not by firing order.

The other possibility is that you have a faulty dual mass flywheel mimicking an engine miss--is your truck a manual trans model?

Mike Cleary
Ford Certified Senior Master Technician and Powerstroke Specialist
Technical Trainer, Automotive Technical Support Services
P.O. Box 27522
Fresno, CA 93729
e: mcleary@atsstraining.com

Last edited by fordmt; 12-29-2007 at 09:42 AM. Reason: Mispelling
fordmt is offline  
post #9 of 10 Old 12-30-2007, 03:56 PM Thread Starter
Powerstroke.org Rookie
 
Join Date: Dec 2007
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I think that I have seen a sticker by the PCM that has something to do with an upgrade. The dual mass has been taken out, it went quickly with the persistant miss, which took out the pressure plate(loosening the rivets). The single mass works, but accentuates the miss, and it feels like you have a warped flywheel. When the truck is dead cold, the engine is as smooth as could be, this clutch problem is't there.

How can I tell if the PCM has indeed been updated to the newer specs?
cdk4219 is offline  
post #10 of 10 Old 12-30-2007, 04:51 PM
Premium Member
 
Join Date: Sep 2007
Posts: 108
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Look up the module ID number with your scan tool. Then let me know what it is and I will follow up.

Mike Cleary
Ford Certified Senior Master Technician and Powerstroke Specialist
Technical Trainer, Automotive Technical Support Services
P.O. Box 27522
Fresno, CA 93729
e: mcleary@atsstraining.com
fordmt is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome