1990 F150 acceleration issues
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Yes, this is possible.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Try clockwise just a hair (to the right), and check the timing with the Spout unplugged. If that brings the timing closer to 10deg, then turn it a little more and re-check until you get to 10deg.
You might want to put a mark on the distributor lined up with a fixed spot on the engine so you don't lose your place.
Keep an eye on your timing light cables so they don't fall into the fan.....
You might want to put a mark on the distributor lined up with a fixed spot on the engine so you don't lose your place.
Keep an eye on your timing light cables so they don't fall into the fan.....
Hotshot
Joined: Jun 2015
Posts: 12,839
Likes: 2,437
Unfortunately some call it that.
Correct. Only loosen the hold down bolt enough to turn the distributor. If it is too loose the distributor will be hard to set while you look at the light and snug down the bolt. Unless you have a third hand.
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Freshman User
Joined: Nov 2012
Posts: 41
Likes: 0
ok, set base timing at 10 and did a KOER test, codes displayed 11r, truck is running about 98%, still has a slight miss in 2nd gear. hopefully the computer can correct. but it is doing great thanks to you guys help. Thank You Brothers!!!
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Check your KOEO again when you get the chance, make note of any CM/Memory codes.
Set up your signature line next time around....
Also, I always recommend you dump in a few tins of HEET gas-line antifreeze in a 1/8 tank of fuel every now and then to soak up the water, then add another 1/4 tank of fuel shortly after. But really, if you use the truck rarely, keep little to no fuel in it, dump a tin of heet in it when you use it an only put in enough fuel to complete the task.
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Freshman User
Joined: Nov 2012
Posts: 41
Likes: 0
Thanks a lot old timer, did a KOEO test code 11 was only code. truck still stumbles in 2nd gear, but improves. I also added some of the heet additive. haven't driven the truck any this week. I bought a 2000 mustang. been driving it.
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Freshman User
Joined: Nov 2012
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hey ya'll, im still having trouble with my 1990 f150 4.9L. idle is really bad. KOER codes 12,22,42. replaced idle air control valve with no change. missing really bad. running very lean. dont know what to do next. if anyone can help it would be very appreciated, thanks
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Freshman User
Joined: Nov 2012
Posts: 41
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Update....Replaced the amazon MAP sensor. Added "Heet" and some SeaFoam. All so added fresh gas. Kept running the old dog and slowly started to notice improvement. The code checker is a tremendous help. Thanks Again
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howman
1987 - 1996 F150 & Larger F-Series Trucks
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Aug 18, 1999 06:46 AM