1990 5.0 F150 missing after rebuild
#1
1990 5.0 F150 missing after rebuild
My sons 90 F150 with a 5.0 had a burnt valve. It ran good other than the missing cylinder from the burnt valve. We built another 5.0, bored, new pistons, heads worked and now it is missing like crazy. It will not pull a greased string from a cats butt.
We put plug wires on it before tearing it down so we didn’t renew them. I replaced the distributor since the gear on the old one was chipped and had a lot of wear. New plugs, water pump just about everything replaced.
If it were something other than all the electronic and fuel injection I probably could fix it. It will backfire some, not all the time. It misses sitting idling and when it’s revered up it sounds much better, but when trying to drive off it doesn’t have any power regardless of rpm.
The egr valve was disconnected when we got the truck and it appears it may have had a smog pump, but it too is no longer on it.
I have checked the timing and actually set it with a light. I think I have tried it anywhere from 0 to 10 degrees BTC.
If anyone has any suggestions, I’m listening. My son really needs his truck, but I’m lost as a ball in high grass.
Any help would be greatly appreciated.
Thanks
We put plug wires on it before tearing it down so we didn’t renew them. I replaced the distributor since the gear on the old one was chipped and had a lot of wear. New plugs, water pump just about everything replaced.
If it were something other than all the electronic and fuel injection I probably could fix it. It will backfire some, not all the time. It misses sitting idling and when it’s revered up it sounds much better, but when trying to drive off it doesn’t have any power regardless of rpm.
The egr valve was disconnected when we got the truck and it appears it may have had a smog pump, but it too is no longer on it.
I have checked the timing and actually set it with a light. I think I have tried it anywhere from 0 to 10 degrees BTC.
If anyone has any suggestions, I’m listening. My son really needs his truck, but I’m lost as a ball in high grass.
Any help would be greatly appreciated.
Thanks
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That was the opportunity. I’ve been driving Rangers for 25 years now, back when I did mechanic work built a lot of engines, but this newer stuff. . . I struggle with them!
I’m down to an occasional miss if you’re getting in it. We cleaned the injectors, but I really think it’s on the firing side. Could have a wire breaking down I guess.
I really appreciate the help Big Guy.
I’m down to an occasional miss if you’re getting in it. We cleaned the injectors, but I really think it’s on the firing side. Could have a wire breaking down I guess.
I really appreciate the help Big Guy.
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I did use the 90 model distributor. It seems to sputter/miss some from about 1,700 rpm up to about 2,500.
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My son drove it to school today and to work tonight. He called me earlier to let me know the range the RPM was in when it was missing some. He also said it didn’t seem to have the accelation it did before building it.
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I’ll try that tonight when I get in from work. I have turned the distributor while listening to it and also used a timing light.
Thanks for the info guys, maybe I can get it “healed” soon. I’m about ready to pull my hair (what’s left) out. I guess I shouldn’t gotten into the computerized vehicles way back.
Thanks again.
Thanks for the info guys, maybe I can get it “healed” soon. I’m about ready to pull my hair (what’s left) out. I guess I shouldn’t gotten into the computerized vehicles way back.
Thanks again.
#15