4.2 help
Thread Starter
Junior Member
Joined: Jun 2013
Posts: 10
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4.2 help
i got a 97 f-150 with a 4.2 i just changed the head because it had a burnt valve and it smoked for about 3 min then it would stop, but now i changed the head it smokes worse than it did before but it still stops after about 3 min and its kinda hard to start.. i put new seals on the head before i put it on.. is my engine shot or whats happening it runs worse now than it did before
Senior Member
Joined: Jul 2010
Posts: 8,544
Likes: 2,552
From: Alaska
We need more information to give you an honest opinion. How many miles?
It could be the cats heating up and burning off whatever you put into them from the head before repairs, or you could have too much compression now, causing the rings to have oil come up by them, thus burning oil. It's hard to diagnosis anything without hearing all the problems. Hard start could be injectors, other fuel related problems, weak crank or cam sensors, faulty ground, and the list goes on. Have you run a scan on the OBD port to see what codes are set? I'll bet you have a code or two stored in memory and will help to pinpoint your problem. Good luck.
It could be the cats heating up and burning off whatever you put into them from the head before repairs, or you could have too much compression now, causing the rings to have oil come up by them, thus burning oil. It's hard to diagnosis anything without hearing all the problems. Hard start could be injectors, other fuel related problems, weak crank or cam sensors, faulty ground, and the list goes on. Have you run a scan on the OBD port to see what codes are set? I'll bet you have a code or two stored in memory and will help to pinpoint your problem. Good luck.
Thread Starter
Junior Member
Joined: Jun 2013
Posts: 10
Likes: 0
We need more information to give you an honest opinion. How many miles?
It could be the cats heating up and burning off whatever you put into them from the head before repairs, or you could have too much compression now, causing the rings to have oil come up by them, thus burning oil. It's hard to diagnosis anything without hearing all the problems. Hard start could be injectors, other fuel related problems, weak crank or cam sensors, faulty ground, and the list goes on. Have you run a scan on the OBD port to see what codes are set? I'll bet you have a code or two stored in memory and will help to pinpoint your problem. Good luck.
It could be the cats heating up and burning off whatever you put into them from the head before repairs, or you could have too much compression now, causing the rings to have oil come up by them, thus burning oil. It's hard to diagnosis anything without hearing all the problems. Hard start could be injectors, other fuel related problems, weak crank or cam sensors, faulty ground, and the list goes on. Have you run a scan on the OBD port to see what codes are set? I'll bet you have a code or two stored in memory and will help to pinpoint your problem. Good luck.
got my own snap-on diognostic scanner the only code it throws is for the iac.. is there a way to get the rings free up like putting tranny fluid in the cyl