Emission System Light
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Originally Posted by Pocket
Without any symptoms, finding the offending sensor is a crap shoot.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Mechanic changed the MAP sensor. The crew took it home last night and the intermittent light came back this morning. Mechanic said P1316 was thrown and wanted to clean the injectors?
The service manual says to check for a short, searching the forum everyone says this is probably UVCH related, but the truck never ran rough.
If no one else has any thoughts I guess will be checking resistance at the plugs and see if we can find this ourself.
The service manual says to check for a short, searching the forum everyone says this is probably UVCH related, but the truck never ran rough.
If no one else has any thoughts I guess will be checking resistance at the plugs and see if we can find this ourself.
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
P1316 is most commonly related to the UVC harnesses. Since in your case the light is very intermittent, then one side or the other may just be slightly loose, enough to set make the SES light flicker, but not enough for you to notice engine wise. Too bad your mechanic stopped there and wanted to clean out your injectors. Wrong move. He should have pulled codes that were stored in the IDM to determine which bank of injectors was giving you the problems. That way you would know which valve cover to pull and inspect the UVC harness. P1316 means that there are codes stored in the IDM itself, and can be retrieved by running an injector buzz test.
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Hotshot
Joined: Feb 2007
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From: Sterling Heights,Mi
Are they standing on it, with a load? around 2300-3500 rpm's when this happens? just a thought, my truck appears to try and flash something at me when I am coming from a dead stop to WOT up to 70 mph while pulling my camper.......
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Post Fiend
Joined: Mar 2007
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From: Texas
Have you ever heard the saying "Somewhere in Texas there's a village missing its idiot"?
Well that would be because I hired him and he's driving one of my trucks. I heard later that the driver was telling other guys on the crew how strange it was that when the light came on the truck seemed to run really rough, but would smooth out when the light went off.
It was indeed a loose UVCH connector that also had a chaffed wire. So a new harness and all is well.
Thanks for the input.
Well that would be because I hired him and he's driving one of my trucks. I heard later that the driver was telling other guys on the crew how strange it was that when the light came on the truck seemed to run really rough, but would smooth out when the light went off.
It was indeed a loose UVCH connector that also had a chaffed wire. So a new harness and all is well.
Thanks for the input.
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