MSD causing this problem?
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Joined: Jan 2003
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From: U S of A
MSD causing this problem?
I have an 86 f150, 351c (from a 75 or 79 ford)....i'll be riding down the road, and the teach will read at a steady 4900-5100. then it'll read 6000...then it will spin around like a clock, read correctly, sit at zero, then go back to the correct reading.
i also noticed, that when i punched the gas when i was doing this, it's a total pig, no acceleration, no pickup, nothing.
also, when i shut it off during it's little tach-dance, and try to crank it back up it either a) won't crank or b) rur...rur...rur... until it cranks.
any ideas? anything would be helped, I'm not ready to pay the $55/an hour to have it looked at!
i also noticed, that when i punched the gas when i was doing this, it's a total pig, no acceleration, no pickup, nothing.
also, when i shut it off during it's little tach-dance, and try to crank it back up it either a) won't crank or b) rur...rur...rur... until it cranks.
any ideas? anything would be helped, I'm not ready to pay the $55/an hour to have it looked at!
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Senior User
Joined: Jan 2003
Posts: 172
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From: U S of A
MSD problems 351c
I have an 86 f150, 351c (from a 75 or 79 ford)....i'll be riding down the road, and the teach will read at a steady 4900-5100. then it'll read 6000...then it will spin around like a clock, read correctly, sit at zero, then go back to the correct reading.
i also noticed, that when i punched the gas when i was doing this, it's a total pig, no acceleration, no pickup, nothing.
also, when i shut it off during it's little tach-dance, and try to crank it back up it either a) won't crank or b) rur...rur...rur... until it cranks.
any ideas? anything would be helped, I'm not ready to pay the $55/an hour to have it looked at!
i also noticed, that when i punched the gas when i was doing this, it's a total pig, no acceleration, no pickup, nothing.
also, when i shut it off during it's little tach-dance, and try to crank it back up it either a) won't crank or b) rur...rur...rur... until it cranks.
any ideas? anything would be helped, I'm not ready to pay the $55/an hour to have it looked at!
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Joined: Dec 2003
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From: Honkytonkville
To me, it sounds like a problem in the timing. I can't see where the tach and engine problem are connected though. Isn't your tach connected to the coil? I honestly think you need to time the truck according to specs for the engine, and consider buying a new tach. That's what I would do anyhow, and I'm not familiar with YOUR ignition.
Scott
Scott
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Joined: Dec 2003
Posts: 18,423
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From: iowa
on the tack issue get a tack adaptor from msd some tacks don't like the msd box, but hte adapter cures it, and I would try that first it may cure your whole problem.
Also they quit making clevelands in the us in 1974 so if it's from a 75 or 79 then it would probably be a 351m/400.
Also they quit making clevelands in the us in 1974 so if it's from a 75 or 79 then it would probably be a 351m/400.
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Anthony487
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