here's one for ya.
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Posting Guru
Joined: Jan 2009
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here's one for ya.
my bro innlaw has a 1989 f-250 with the 7.3 in it.when he starts it up it runs great for about 15min, then when it warms up a little bit it turns into a fog machine. it blows blue smoke terribly and you can smell raw fuel so bad that it burns your eyes and it doesnt clear up no matter how hard he runs it.i thought i read awhile back that somehow the return lines get plugged up causing this but i'm not sure.can anyone help?.
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
Does the smoke come on at the same time as the high idle/ cold advance shutting off? ( the engine will have a dendancy to start running badly instantly, not gradually.
In some cases really badly worn out injector pumps can develop poor running when the engine is warmed up.
In some cases really badly worn out injector pumps can develop poor running when the engine is warmed up.
Senior User
Joined: May 2007
Posts: 320
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From: Troy MT
or the engine could be junk. my buddies 6.5L torched a cyl and ran like that until it warmed up. but it cleared up after that. i would say because it runs decent at start up check the compression on each cylinder. its cheaper than testing an IP and if the redings are decent. i would then send the injectors off for testing. then the IP. i would use the available options in the order thats cheapest but thats just me. a compression test should run about 50 bucks or he can do it him self for about the same by buying a compression tester.
