99 7.3 smoking at idle but go's away under load... - Ford Powerstroke Diesel Forum
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Old 01-05-2010, 10:07 PM
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Unhappy 99 7.3 smoking at idle but go's away under load...

I am a general manager of an automotive shop, and I have a customer that has brought a 99 F-250 SD with a 7.3 Powerstroke. He stated that he took it in to the ford place for white smoke at idle. They sold him 2 remanufactured injectors and told him it was fixed.. He picked it up and it was worse it smoked all the time including acceleration and deceleration and at idle. He brought it to us to fix.. so we used the EVO and ran all the test possible on the truck it came back with codes on the same injectors they had replaced. We put 2 new injectors in it and put on a new turbo and it still smoked so we ran diagnostics again. it said #8 injector was malfucntioning so we changed it out now the smoke is better just at idle and none on acceleration.. We run the KOER and KOEO test and it come up with P1298 so we ordered a new IDM put on no change. We have a 7.3 in our wrecker so we changed out PCM and IDM and our truck never smoked. so we put these components back like they were. The performance of the truck is great has fast pick up speed and overall great performance. but puts out alot of white smoke with raw diesel smell while idling.. Tonight we unplugged driver's side valve cover gasket and it did not change so we plugged it back in and unplugged the passenger side and it almost completely cleared up.. so I assume it is something in the passenger side bank.. which is where the new injectors were installed. Done buzz test and contribution test and everything passed .. Any help would be greatly appreciated.. Stuck in Mississippi.
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Old 01-06-2010, 03:58 AM
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Have you run a compression test? You may have low compression on 1 or 2 cylinders.
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Old 01-06-2010, 04:42 AM
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Sounds like you need to replace the passenger side under valve cover harness.
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Old 01-06-2010, 06:06 AM
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99 7.3

I have run compression test on cylinders 2,4,6,8 have not run the others yet i am tearing it down now to run the other cylinders..
Compression test results:
2: 248
4: 210
6: 213.5
8: 410
I will let ya'll know what the other numbers show when I get it checked..
I am using ALLDATA and it states that ford says from 200- 500 compression is operating range... Thanks for all the help in advance..
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Old 01-06-2010, 07:35 AM
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Even in range don't you think a 200 psi difference is a bit much?
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Old 01-06-2010, 08:44 AM
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yes and I am going to retest it because that was the cylinder that had the faulty injector in it so the cylinder could have had full of fuel and gave a false reading ...
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Old 01-06-2010, 05:21 PM
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we have performed another comp test and #1:264.5,#2:330,#245,#4:283.5,#5:318.5,#6;213.5,#7 :398.5,#8;410.also replaced the right side uvch and performed a leakdown test with no more than 3% leakage.still smoking at idle but not under a load and the only codes are p1298 idm failure and p0284 cyl. #8 contribution or balance malfunction.
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Old 02-17-2010, 06:40 PM
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Did you find a fix yet?
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Old 02-19-2010, 08:34 AM
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No

Not Yet hoping that we can come up with something ...
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Old 02-22-2010, 01:53 PM
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I'm working on a 99 7.3 and I was reading about your problem. I did a compression test on mine and all were 390 to 405lbs. I think your problem is low compression in all the other cylinders that are less than 390lbs. They should be within 5% of each other.
I hope this helps. Rich
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