buzz test results...looking for input - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 3 Old 03-22-2009, 05:26 PM Thread Starter
Join Date: Oct 2008
Posts: 35
Thanks: 3
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
buzz test results...looking for input

I borrowed someones snap on scanner to try and figure out an intermittent miss/hesitation/breaking up at 1400-1600 RPM when warmed up. It almost sounds like a lazy injector. It will seem to make the noise or break up when letting off the foot pedal at that same RPM range.

I performed a Cylinder Contribution Test a few times now over the course of a few weeks and I still come up with a pass result. I performed a buzz test today and got the P1298 code so I searched and found that the code comes up alot when performing the buzz test and I wasn't the only one.

I waited an hour or so and went out and turned the key on and did the buzz test again. This time NO BUZZ just the tach moving 8 times and the P1298 came up again. I started the truck real quick and shut if off I performed the test a few more times and it buzzed and spit out the IDM fault again.

I then performed the KOEO test and got the P1298 IDM fault again. I think I'm going to swap out the passenger UVCHarness (I have one on hand) as I did the drivers side a few months back when I was fooled by grey CPS to change #8 injector.

So far I've swapped foot pedals, swapped over to the black CPS. Cleaned the strainers in the tank and put a solid fuel line to the pump, changed #8 injector and drivers harness, added a 5.6K resistor to the ICP. Each step has made the truck run better overall. Any input is appreciated I think I'll change the passenger UVCH and then try to find someone with an IDM to swap.

What do you think? Thanks in advance.

2001 F250 PSD - Oxford white, Swamps 175/146 Single Shots, intank mods, riff raff rfx ,magnaflow muffler

2001 Lightning - Oxford white, garage queen
DieselSVT is offline  
Sponsored Links
post #2 of 3 Old 06-11-2010, 02:08 PM
SButler83's Avatar
Join Date: Aug 2009
Posts: 78
Thanks: 6
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I have had similar issues with the P1298 on an injector buzz test. It only will show up on a buzz test. The truck seems to run OK, however gets only 16 MPG on 33" tires, My other truck not exhibiting the condition gets 20 MPG. At the time I found the code, I found that my driver's side wiring harness had a short on the #4 glow plug so I changed that UVC setup on that side, put it back together and the glow plug issue was gone but not the P1298. Did you ever swap out the other side harness and have any luck. I have been researching as well and found that on some IDM's ford had issues with them, specifically with production codes OEO5 and OEO26.

Keep me posted and I will do the same for you. My truck doing this is a 2003 (10/2002) F350 7.3L Crew cab Auto 4x4.

Differences in my scenario are that I don't think I've been getting the hesitation, and I have never not had my injectors buzz for the test. I believe on that truck I have had the #8 injector come back low on the power balance test.

Steve in Central CA

'03 F350 CCSB FX4 w/ 7.3L & 4R100, Factory Tech Valve Body, DP Tuner, AIS Intake, & Banks 4" Monster Exhaust 232K MI

'02 F350 SCSB 4x4 OFF Road w/ 7.3 & 6 speed - DP Tuner, AIS Intake, MBRP 4", F650 Dash Mod, AirLift w/ OBA, 223K MI

'97 F350 CCLB 4x4 7.3 & 5spd. 3-3.5" exh, wayne hanson bumper w/ 12k winch, Nelson rear bumper, Gooseneck, 410K
SButler83 is offline  
post #3 of 3 Old 06-15-2010, 07:47 PM Rookie
Join Date: Apr 2010
Location: Western,WI
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Did the Under Valve Cover Harness do the trick? Also check your wiring harness on top of the motor as they are prone to loosing the wiring insulation after awhile(not sure why just have seen a few) Also where the harness plugs into the valve cover is a problem area, look for melted wires or plug. If it ends up being the IDM check with Auto Computer Exchange out of Florida, I got one from them a month ago and am very happy, was $$$ less than the $750 from Ford
97Fordrunner is offline  
Sponsored Links

Quick Reply

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


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

Email Address:


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