Hello everyone,
I am just recently getting back into the Fox mustangs. I've had a few in the past then stepped up to an 03 Cobra a few years ago. Now I am back with the Foxes because I started driving with one and can't seem to get it out of my system.
I purchased a very clean and low mileage 1990 LX 5.0, 5spd about a week ago. A couple of small things concern me. The speedometer jumps at low speeds, but I pretty much know how to fix it. My main concern right now is the odd tach movement. When you start the car, the tach will jump a bit, not much, but like it's having a mild seizure before it gets to idle range. It will idle fine, but when you give it gas quickly, the tach does not move smoothly, as it seems to lag slightly at certain points. Also, when the car is turned off, the tach will bounce as the RPM's approach 0. Also, the other day, during hard acceleration in 4th, it seemed to miss a bit. Idle is for the most part smooth, but doesn't seem as smooth as stock.
I have heard about jumping tach problems and issues with the pip sensor, but the tach doesn't bounce crazy like it's not grounded, and I don't have any heat soak problems. Car ran for 2 hours the other day and turned off and started up fine after. Just wondering if I can fix this issue some simple checks or do I have to get a completely new distributor.
Only modifications this car has (from previous owner)
Mac equal length headers (spark plugs wrapped)
Off road H
Flowmasters
Cold air intake (inside fenderwell)
MSD Distributor (stock coil)
I am just recently getting back into the Fox mustangs. I've had a few in the past then stepped up to an 03 Cobra a few years ago. Now I am back with the Foxes because I started driving with one and can't seem to get it out of my system.
I purchased a very clean and low mileage 1990 LX 5.0, 5spd about a week ago. A couple of small things concern me. The speedometer jumps at low speeds, but I pretty much know how to fix it. My main concern right now is the odd tach movement. When you start the car, the tach will jump a bit, not much, but like it's having a mild seizure before it gets to idle range. It will idle fine, but when you give it gas quickly, the tach does not move smoothly, as it seems to lag slightly at certain points. Also, when the car is turned off, the tach will bounce as the RPM's approach 0. Also, the other day, during hard acceleration in 4th, it seemed to miss a bit. Idle is for the most part smooth, but doesn't seem as smooth as stock.
I have heard about jumping tach problems and issues with the pip sensor, but the tach doesn't bounce crazy like it's not grounded, and I don't have any heat soak problems. Car ran for 2 hours the other day and turned off and started up fine after. Just wondering if I can fix this issue some simple checks or do I have to get a completely new distributor.
Only modifications this car has (from previous owner)
Mac equal length headers (spark plugs wrapped)
Off road H
Flowmasters
Cold air intake (inside fenderwell)
MSD Distributor (stock coil)