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1999 Powerstroke will crank but not start
This truck has me stumped. I bought the truck a few weeks ago knowing that it did not run (got a great deal). Towed the truck to my shop and looked it over. Everything seemed to be in order. It had been sitting for a while. Put one new battery in it and hit the key. It turned over real slow and the starter was intermitent. Put the truck on charge for an hour and replaced the starter the truck was cranking good at that point. After a couple minuets of off and on cranking I got the thing to start (I hit the jackpot). Smoked heavy and idled rough for a few minuets then cleared out and idled smooth. Took it for a test drive ran great, good power and throttle response. Pulled it back in my shop and shut it off and thats the last time it has ran. I have read many threads on here and checked everything I can think of (fuses, harneses, hpop level, battery voltage, fuel filter). I pulled the valve covers checked every connection.
When the batteries are up good it acts like it wants to start but just wont do it. I did bump it with a shot of either once and it did actually fire up but I had to hold the pedal at full throttle to keep it running and it would not get over 1000 rpm sounded terrible.
This truck is a 2001 F350 with 74,000miles. It does has a history with the engine though. The guy I bought it from had the heads off and had them redone. Not sure why? or if it even needed that. Also the exhaust back pressure valve has the harness connector broken off. I took the turbo exhaust tube off and verified that the valve was in the open position and then tied the control arm so that it can not close just to be safe.
I have a cheap scanner and the only codes are the exhaust backpresure valve, Keep alive memory, and P1316 IDM codes detected.
Any ideas or help would be greatly appreciated.
Thanks in advance.