engine missing bad
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New User
Joined: Dec 2001
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From: mechanicsville
engine missing bad
I have a 1986 Aerostar with a 3.0l, automatic tranny. I worked on my exhaust and repaired my rusted rocker panels for the state inspection here in PA and when I went to drive it I had a mess on my hands. the engine seems to miss a little at idle but not more than normal for it. it is when I get to 45 and up at a steedy speed is when it fells like the whole van is about to come apart, the engine runs so rough. if I accelerate it gets smoother. let off the gas and its ok so I don't think it is in the drive train or tires. hooked up a code scanner and it doesn't give any errors. a friend suggested that it could be the oxygen sensor that when bad, I did hammer the exhaust to straighten the flange after the cat and before the muffler so that could make sense. I have 338k on the engine with having only to had replace the head bolts about 60k ago.
thanks for the help
thanks for the help
Elder User
Joined: Aug 2000
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From: home
engine missing bad
[updated:LAST EDITED ON 09-Dec-01 AT 08:03 PM (EST)]Bad ujoints will cause the vehicle to shake a lot like a bad miss when you hit around aprox 45 miles an hour. A bad plug or bad wires would also be a suspect, especially a bad plug when under load going up a hill. Even new plugs or wires are sometime bad.
Junior User
Joined: Oct 2000
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engine missing bad
I agree with Avanti... Having chased a miss in mine for a couple of weeks before finding that a brand new plug was bad. Quite frustrating!
These will run on 5 pretty well until under load. It should be easy to eliminate U joints. Just put it in gear, hold the brake and put a load on it. If it's a bad plug or wire it will break down. If it doesn't, look at the U joints.
Bruce
These will run on 5 pretty well until under load. It should be easy to eliminate U joints. Just put it in gear, hold the brake and put a load on it. If it's a bad plug or wire it will break down. If it doesn't, look at the U joints.
Bruce
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Joined: Dec 2001
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From: mechanicsville
engine missing bad
Got it to run now. went and replaced the oxygen sensor with a good one I got at a junk yard, seeing it was still the original one, and then found that the #1 wire had gotten on the exhaust and burned through. funny that it gave the symptoms that it did, least to me anyway. under load it was ok, just when you eased up on the gas to cruise did it shake on me, load and accelerate it wasn't bad. had my hands on the wire when I checked the timing too, got lucky I didn't find the bad spot, then again it would have been fixed a lot sooner!
thanks for the help
thanks for the help
