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Where to go from here?
I need help diagnosing a drive-ability problem on a 1997 F250 with 136,000 mi.
Here are the symptoms:
2. Consumes oil (1 qt every 160 mi or so)
3. slow throttle response
4. Sluggish acceleration
5. knock at high RPM's
6. smokes on first start
7. fuel bowl is cloudy and filter turns dark quickly.
Here's the problem: It doesn't do it all the time; some times it runes normal (maybe a day out of the week).
Here is what I've done so far:
1. checked compression with the highest at 388 and the lowest at 364
2. replaced turbo
3. turbo pedestal o-rings
4. gutted the EBP valve completely
5. replaced injector o-rings
6. replaced fuel filter
7. cleaned fuel screen in bowl
8. new up pipes, 3" down pipe, and 4" straight pipe
9. GP's and GPR check good
10. New VC gaskets and UVC harnesses
When I had it on a snap-on brick, I noticed the Injection oil pressure was at about 580 and the IPR was at 9%; 9 % I think is low. I'm not real familiar with how the HPOP works with regards to regulation of the pressure to the injectors via the sensors and the PDM.
For possible causes, this is where my imagination is taking me.
2. week injectors
5. And I just don't know(tune maybe).
I'm trying to avoid throwing any more money into this truck than necessary, and don't have the practical experience to diagnose these symptoms. So any advice on how to test to elimination possible causes, additional causes, and knowledge about probability of causes, is appreciated.
I'ts bone stock except for what I told you.
Thanks for your help.
Last edited by Monegrand; 10-29-2012 at 07:01 PM.