Ipr duty cycle problem part two

Reply Subscribe

Thread Tools

Search this Thread

Dec 19, 2013 | 01:57 PM

Farmboypowerstroke

Thread Starter

Elder User

Joined: Jun 2007

Posts: 570

Likes: 0

Ipr duty cycle problem part two

I'm sure you guys all saw my first thread.
After swapping IPR coils I thought we had the problem solved the ipr duty cycle and icp was normal. So I plowed snow for a day, then the next day I hauled a trailer 100 miles, then the following day had to plow snow again. Duty cycle and icp was spot on, truck ran perfect.
Today, started the truck to let it warm up, duty cycle was normal. When I came back in 10-15 mins service engine light was on, duty cycle 4.6.
I went to plow a driveway, once I was done there duty cycle was 5.6 at idle, then did another driveway, then it was up to 7.9. Drove to the carwash to get the salt off the truck since the roads are dry now, let it idle the whole time, duty cycle was up to 8.6, did another driveway duty cycle up to 10.9, now at the end of the day it is between 10.9-12.4 at idle.

What the heck is wrong with this thing?

Dec 19, 2013 | 03:10 PM

Dan V

Lead Driver

Joined: Jun 2013

Posts: 5,648

Likes: 894

From: north of Minneapolis, MN

Have you had a good hard look at the wires that lead to the IPR?...just guessing, maybe you have some chaffing or something that has compromised the integrity of the wires.

Dec 19, 2013 | 04:20 PM

Farmboypowerstroke

Thread Starter

Elder User

Joined: Jun 2007

Posts: 570

Likes: 0

Quote:

Originally Posted by Dan V

Have you had a good hard look at the wires that lead to the IPR?...just guessing, maybe you have some chaffing or something that has compromised the integrity of the wires.

I looked roughly 6-7 inches in from the plug, all wires looked new

Dec 20, 2013 | 05:00 AM

Tugly

Hotshot

Joined: Jan 2011

Posts: 18,849

Likes: 179

From: Puget Sound

I need to mull on this one. You can clean the 42-pin connector and put in fresh dielectric grease... one member had oil there.

Dec 20, 2013 | 01:34 PM

Farmboypowerstroke

Thread Starter

Elder User

Joined: Jun 2007

Posts: 570

Likes: 0

I cleaned it, turned key on, 14.6, started it and it went to 17.9, then slowly dropped to 4.6

Dec 20, 2013 | 02:19 PM

Deluxe06

4000 rounds a min

Joined: Apr 2010

Posts: 2,223

Likes: 0

From: Albemarle NC

What does your ICP look like? Any oil in the plug?

Dec 20, 2013 | 05:21 PM

Farmboypowerstroke

Thread Starter

Elder User

Joined: Jun 2007

Posts: 570

Likes: 0

Quote:

Originally Posted by Deluxe06

What does your ICP look like? Any oil in the plug?

Bone dry.
Today I put in a different ICP, didn't change a thing. KOEO IPR reads 14.8 start truck slowly drops to 4.6. Once engine is good and hot it reads 9.7-10.1 at idle, if you slowly take rpms up to 1400 the duty cycle drops to 4.6 again.
Once engine is good and hot, ICP reads right where it should.
When the engine is cold and IPR is reading 4.6 you can unplug the IPR and the truck runs the same as if it was plugged in. Once the engine is hot though, it will die if you unplug it.
If you unplug the ICP at idle the IPR jumps to 15.6