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Old 06-09-2012, 11:12 AM
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got a problem, can i get some help please?

I got an early 99 7.3, the truck has a rough, lopeing, surging kinda idle and it hiccups one time on accel. I have put, and injector, cam sensor, valve cover harnesses and checked the driver side engine harness for chaffing against the valve cover. this truck still does it. I am at a loss. can i get some ideas?

I work for ford but i fix trucks on the side, but this one has gotten me stumped. I do not have the knowledge of the 7.3s like i should i grew up working on the 6.0s and newer engines. I am always willing to learn somthing so throw some ideas out there. I dont care how weird they sound i will try it.

thanks
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Old 06-09-2012, 11:17 AM
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Check your IPR and the wiring to the IPR. My truck was just doing this. I found the IPR wiring was damaged at the connector to the IPR. I went to the Local International Dealer and got a new pig tail. I repaired the wire going to the IPR and the problem is solved.
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Old 06-09-2012, 12:06 PM
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checked and no damage found. do you think the ipr it self could be causing this?
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Old 06-09-2012, 01:24 PM
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Quote:
Originally Posted by a.simpson View Post
checked and no damage found. do you think the ipr it self could be causing this?
I would not swap out the IPR with out being able to check the pressure of the current one. If you have Auto Enginuity, or know someone with it or a scan tool. Then you can start the truck and check the pressure readings.

I only say that because the IPR is not a cheap item to replace. But you could try it and see.

I do strongly believe it is something with the IPR, ICP, or even IDM

Only other thing would be to do a cylinder contribution test and see if you have a bad injector.
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