89 302 EFI Missing Problem
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just now noticed that this thread had been resurrected...
The symptoms in my original post just seemed to clear themselves up. I really didn't do anything, the miss just sorta went away on it's own...
Sorry I couldn't offer more help.. If it makes you feel any better, I have a new - even more strange problem... https://www.ford-trucks.com/forums/s...d.php?t=224649
The symptoms in my original post just seemed to clear themselves up. I really didn't do anything, the miss just sorta went away on it's own...
Sorry I couldn't offer more help.. If it makes you feel any better, I have a new - even more strange problem... https://www.ford-trucks.com/forums/s...d.php?t=224649
Post Fiend
Joined: Mar 2003
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From: Sarnia, Ontario, CANADA!
Originally Posted by Lagerlot
I have a 90 302 efi that is acting similar. it idles fine when its in gear it shakes,, enough to take notice and wonder what the heck is wrong now ,, but under full acceleration no miss. it shimmies at when i'm not hard on the gas. I'm guessing new wires roter and cap and quite possible a new coil. seems like it gets enough spark when the rpms are higher. I did put new plugs in it . 1500 miles ago
I have the EXACT same problem......hmmmm...hopefully we can figure it out!
-Matt
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From: Williamsport,Pennsylvania
well i put a new cap and rotor in and it didn't help. I heard the synthetic combined with the risoline might have really loosened things up as far as rings . i'm going to go with a little heavier oil , clean the plugs and see what that does i'll keep you posted .
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From: Williamsport,Pennsylvania
ok here is an update. new wires installed drained and changed the oil. still doing the same thing. I pulled the plugs and looked at them and they are lighter colored than new but not all oily and nasty looking. This thing still runs like crap unless its wide open. only thing not new electrical is the coil. but would that be the problem. I have done minor changes with little money involved. Would a fuel filter cause this or maybe a fuel regulator? I just don't know. is it possible I lost compression with the synthetic and risoline and need a rebuild. It did burn 3 qt.s of oil in 3 weeks. I will try to check codes but i have been working weird hrs and I don't have a garage to check them in.
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A couple of notes on plug wires...
Use separators on your plug wires - it's not likely since they're new, but you could have a crossfire. Also, the plug wires that go to the cylinders on the passenger side run very close to the tube that takes exhaust gas to the EGR valve. That tube should be insulated, but if it's not and you have a plug wire too close to it the insulation on that wire could be burned enough to make it arc...
Use separators on your plug wires - it's not likely since they're new, but you could have a crossfire. Also, the plug wires that go to the cylinders on the passenger side run very close to the tube that takes exhaust gas to the EGR valve. That tube should be insulated, but if it's not and you have a plug wire too close to it the insulation on that wire could be burned enough to make it arc...
Post Fiend
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From: Sarnia, Ontario, CANADA!
Originally Posted by 95 F150
I just had the same exact problem on my truck. It turned out to be the oxygen sensor.
-Matt
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I had a problem that would come and go on my 89 Ford 302. Misses at low end, it turned out to be a leak in the fuel regulator. Gas was being pulled directly into the manifold thru the vaccume line . This progressively became worst with time. When I pulled the vaccume line gas blew out of the line.
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From: Williamsport,Pennsylvania
well I have spoke with my garage guy and he thinks the oil i lost is in my cat. he says what i'm telling him sounds like it could be clogged. I'm in the process of pulling off the exhast to see if that helps it . Them manifold bolts are a bugger and I havn't had a lot of time to do it . "driveway mechanic" I go on vacation soon so I'm working ot to get ready. I got one nut off tonight i'll have to wait till tommorow night if it doesn't rain on me. an o2 sensor makes sence since I did loose 3 qts of oil in 3 weeks .
Laughing Gas
Joined: Mar 2003
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From: Colorado, U.S.A!
Lots of posts about the PCV routing. Some reroute the PCV line to the vacuum tree at the top of the upper intake to distribute the flow more evenly and stop dumping everything into #8. That cylinder has more than it's share of problems because of that. I hear that the later model Ford production setup is also revised accordingly.
