Tune up causes stumbles upon acceleration!?!?!
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Freshman User
Joined: Nov 2013
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Tune up causes stumbles upon acceleration!?!?!
I just acquired a 1991 Ford F150 with a 300 6 cylinder and 5speed trans. Ran pretty good but since I knew nothing about its history I did a full tune up. Cap, rotor, plugs, wires, o2 sensor, serp belt, oil, filter, air filter, pcv valve, breather filter. When I crank it up it purrs like a lil titty tat. Going down the road now under acceleration it stumbles. Back off and it is smooth. Idle is smooth. Acceleration stumbles. I bought the fuel filter but didn't get to it last night. I will be putting it on tonight but I doubt that has anything to do with it.
Any ideas?
Any ideas?
Fleet Mechanic
Joined: Jan 2013
Posts: 1,305
Likes: 8
since it ran fine before, it would be a good idea to go back and check your work ... is the rotor seated properly ? cap screwed down properly ? plugs tightened ? plug wires all seated properly ? firing order correct ? also, make sure you didn't knock off a vacuum line or break one of the plastic nipples that they connect to (speaking from experience here) .
also, with such crappy parts being made these days, if checking all these things doesn't make any difference, you could try swapping in the old rotor, and then cap, one at a time, and see if anything changes.
also, with such crappy parts being made these days, if checking all these things doesn't make any difference, you could try swapping in the old rotor, and then cap, one at a time, and see if anything changes.
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
since it ran fine before, it would be a good idea to go back and check your work ... is the rotor seated properly ? cap screwed down properly ? plugs tightened ? plug wires all seated properly ? firing order correct ? also, make sure you didn't knock off a vacuum line or break one of the plastic nipples that they connect to (speaking from experience here) .
also, with such crappy parts being made these days, if checking all these things doesn't make any difference, you could try swapping in the old rotor, and then cap, one at a time, and see if anything changes.
also, with such crappy parts being made these days, if checking all these things doesn't make any difference, you could try swapping in the old rotor, and then cap, one at a time, and see if anything changes.
Postmaster
Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
"since it ran fine before, it would be a good idea to go back and check your work"
X2 on what joey2fords said.
X2 on what joey2fords said.
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Senior User
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From: Marlborough, CT
The grease goes outside, under the wire boots. If you got it on the contacts inside the perimeter of the cap, that would be your problem. ~Bill
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Freshman User
Joined: Nov 2013
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thanks for all the replies I found the problem... I wish I could upload a picture easily from my phone. the rotor is destroyed not sure how or why.
I love this truck / this engine cause this s.o.b is a champ to even run with this rotor button looking like this!
I love this truck / this engine cause this s.o.b is a champ to even run with this rotor button looking like this!
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