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Old 03-08-2012, 04:25 PM
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Help diagnosing white smoke, rough idle, loss of power

2001 F350 7.3 dually automatic 4X4
I coud use some help diagnosing my truck. It blows white smoke out the tailpipe upon start up. Once it warms us it seems to go away. It burns oil, about a quart every 1,000 miles or so. It idles rough and I have noticed a loss of power and drop in mileage.

I've had two shops look at it and have gotten conflicting diagnoses from both. One said the #2 cylinder was bad - failed compression test (it was around 200 lbs. while all others were in the >300 lbs. range). I had another tell me the #2 injector was bad and the ICP sensor was bad.

They want $1K to replace the injector, $2200 to replace all four on that side. I don't want to (can't) put that kind of money into the truck if the rings and/or valves are bad. I've asked them if they could help diagnose it further, i.e. check to see if the rings and/or valves are bad. They don't want to. Just want to replace the injector(s) and the ICP and "go from there". If the rings are bad I will probably just park it for a better financial day and then put in a short or long block.

I think I'm going to have to take over diagnosing myself from here. I don't have the Enginuity software so it was probably worth it for them to diagnose the injector/ICP.

How would you recommend I proceed? My thoughts were to do a compression test. However, if it turns out to be bad how do I know if it's the rings or the valves? I realize a leak down test is used to diagnose the valves (I believe) but I have no idea how to do one and don't know if I have the tools/equipment to do it. Any advise would be greatly appreciated. Thanks.
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Old 03-10-2012, 05:25 AM
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Quote:
Originally Posted by rlpatte View Post
2001 F350 7.3 dually automatic 4X4
I coud use some help diagnosing my truck. It blows white smoke out the tailpipe upon start up. Once it warms us it seems to go away. It burns oil, about a quart every 1,000 miles or so. It idles rough and I have noticed a loss of power and drop in mileage.

I've had two shops look at it and have gotten conflicting diagnoses from both. One said the #2 cylinder was bad - failed compression test (it was around 200 lbs. while all others were in the >300 lbs. range). I had another tell me the #2 injector was bad and the ICP sensor was bad.

They want $1K to replace the injector, $2200 to replace all four on that side. I don't want to (can't) put that kind of money into the truck if the rings and/or valves are bad. I've asked them if they could help diagnose it further, i.e. check to see if the rings and/or valves are bad. They don't want to. Just want to replace the injector(s) and the ICP and "go from there". If the rings are bad I will probably just park it for a better financial day and then put in a short or long block.

I think I'm going to have to take over diagnosing myself from here. I don't have the Enginuity software so it was probably worth it for them to diagnose the injector/ICP.

How would you recommend I proceed? My thoughts were to do a compression test. However, if it turns out to be bad how do I know if it's the rings or the valves? I realize a leak down test is used to diagnose the valves (I believe) but I have no idea how to do one and don't know if I have the tools/equipment to do it. Any advise would be greatly appreciated. Thanks.
i would stay away from the shop that just wants to throw parts at it..... doesn't sound like they know how to diagnose things or wants to take your money .Good Luck!
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Old 03-10-2012, 06:20 AM
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If it were me I would order a set of orings for the injectors and see if that solved the problem. Without apparent leaks to use that much oil in 1000 miles, and low compression, leads me to think that your injectors aren't sealing properly.

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