1990 F150 Intermittent issues.
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1990 F150 Intermittent issues.
I have a 1990 F-150 with a 5.0 and 5 speed 4 wheel drive. In the past I had a problem with injector pulse not coming out of the ecm. I replaced the ecm with a junk yard ecm and the truck ran fine for about 2 months. This last week the I started the truck and drove it home from work and it seemed to have a strong odor of fuel but no smoke and the truck just had no power. Later that day I got in the truck and it drove perfectly. Since then about every other time I drive it it has this issue. I have no check engine light on but pulled codes anyway and got these. KOEO 12,51,63,44,22,41,34. KOER 52,77,34,44. About ten minutes later without resetting or driving I checked codes again and they were. KOEO 21,24,34 and no KOER codes. Anyone have any ideas?
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From: Overland Park
From what I have read it sounds like something on the EGR side, at least with the newest set of codes. As far as the old ones, it goes all over the board from coolant temps to power steering. Try disconnecting the battery for a little while and then driving it. It will idle/run rough for a little bit but it will even out.
Last edited by AndrewW; Jan 16, 2013 at 11:48 PM. Reason: Wrong word used
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Ok so I unhooked the battery for a bit before work this morning. It drove great for the 15 mile trip to work and great for the 15 miles back. I got home and had to leave about 20 minutes later and it drove like crap again for about 5 miles untill I got back home so I checked the codes and they were KOEO 11 and 34. KOER 34, 44, 25 and 52. I also found that I have no vacuum to my egr valve and no vacuum to the egr vacuum solenoid. I guess my next step would be to find why I have no vacuum and go from there? Any thoughts or ideas?
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From: Overland Park
My first step would be to follow the vacuum line that goes to the solenoid. If there are no leaks in the line I would then test the voltage to the solenoid to see if it has gone bad. You might want to also check the EGR valve to see if it is clogged or has allot of carbon build-up.
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Fleet Mechanic
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From: New York
Try disconnecting (electrically) the EGR solenoid and see how it runs. That will likely set off your CEL, but don't worry about that for now - we're just trying to pinpoint whether the problem is EGR related or not right now.
Another possibility is a failing PCM due to leaking capacitors. I've yet to find one of this era that didn't have at least one leaking. See some of the recent threads on that topic for more info.
Another possibility is a failing PCM due to leaking capacitors. I've yet to find one of this era that didn't have at least one leaking. See some of the recent threads on that topic for more info.
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Thanks for the suggestions guys but unfortunantly I will not be needing further help with this issue due to the fact that this morning I either cracked my block, one of my heads or blew a head gasket and The truck is now down. Thanks for the help it was much appreciated.
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