Idles rough
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Tuned
Joined: Jul 2002
Posts: 462
Likes: 5
From: Kansas City, Mo
Idles rough
2003 7.3 201K miles. Did some research and determined it was ICP sensor. Replaced sensor with a factory Ford sensor. No problems for about a week. Now when I start the truck it idles rough and the check engine light comes on. This doesn't happen all the time. When it does it usually only last a few minutes. Seems after truck warms up it goes away completely. I have a Scan GuageII that says it reads codes but says none available. Is this something I should worry about or will it eventually go away? Thanks in advance.
Hotshot
Joined: Mar 2014
Posts: 10,750
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From: Douglassville, PA
Things rarely just go away on their own but YMMV. I'd check all of your harness connections to ensure that they're not loose and the tinnerman nut on the back of the IPR and see where it goes from there.
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Joined: May 2014
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From: Lake Hartwell, GA
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Keep posting information, asking questions and answering questions. You will soon have it sorted out.
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Tuned
Joined: Jul 2002
Posts: 462
Likes: 5
From: Kansas City, Mo
Well I went ahead and took it to my local diesel mechanic due to an up coming trip this weekend. The verdict was a bad #7 injector. Should have it back tomorrow. Should I have told them to just go ahead and replace all the injectors on that side? Thanks.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,795
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From: Elk Grove, CA
I'd say no. Then half would be fresh and half old.
There are tests for the injectors that often misdiagnose #8 and #3, but #7 is not commonly misdiagnosed. So maybe they are right.
Could also be the UVCH connector is loose inside and #7 just shows the worst resistance. Once open I bet they'd see that and push it back together anyway. Fixed either way.
Be sure to give it a thorough test drive including some bumps to see if jostling the wiring makes a difference. Inspect wire harness to 42 pin connector over the driver side valve cover, it can rub and short there causing intermittent troubles.
If the issue continues bring it back to them immediately.
There are tests for the injectors that often misdiagnose #8 and #3, but #7 is not commonly misdiagnosed. So maybe they are right.
Could also be the UVCH connector is loose inside and #7 just shows the worst resistance. Once open I bet they'd see that and push it back together anyway. Fixed either way.
Be sure to give it a thorough test drive including some bumps to see if jostling the wiring makes a difference. Inspect wire harness to 42 pin connector over the driver side valve cover, it can rub and short there causing intermittent troubles.
If the issue continues bring it back to them immediately.
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patrick77598
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