Check engine light on startup rough idle
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Trailering
Joined: Oct 2021
Posts: 21
Likes: 1
Check engine light on startup rough idle
I’m very confused at this point. I have 97 7.3 with 160/30 injectors. When I start my truck I get a check engine light and it runs rough for about 30 seconds. Then smooths out and the light goes away. When I plug in a scanner to the obd2 and connect it to my app it starts just fine no light so I can’t even check what codes it’s throwing. I have replaced my IPR ICP CPS sensors trying to fix this problem. I’m very lost at this point and don’t know what to try next to fix this issue
Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
First thing that comes to my mind is get those codes and post them up.
Has it always been doing this since the injector install? Who's tunes did you get? What brand/builder of injector did you use?
Has it always been doing this since the injector install? Who's tunes did you get? What brand/builder of injector did you use?
Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
Was the ICP an OEM sensor, there's a lot of fakes on the webs, only place I would trust would be a dealership or Riffraff diesel. Check the ICP connection/wiring as well as it could also throw that code and make a rough idle.
Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
Big red flag on ICP if it's not an OEM FoMoCo or Navistar sensor. Is the IPR and the CPS a store bought sensor as well?
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Trailering
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Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
Rule of thumb with the 7.3 powerstroke is to always buy OEM sensors from a reputable source, if it were me I would buy OEM sensors then start trouble shooting from there, our engines don't play well with aftermarket sensors.