- Oct 26, 2017
- 29
- 4
- 13
1999 Mustang GT with 2001 Romeo motor and TR3650 transmission
I am going to try my best to explain what im talking about here and hope someone has some ideas.
When i first start up my car it shifts smooth as butter into first and then into second. Dont have any issues. Its as if the idle is just perfect and things slip right where it needs to go. As the motor heats up though, and i drive it a lot, it starts to get more jerky when shifting into 1st and second. Eventually i find at a light, when its been driven a bit and its good and hot, that getting the car going in 1st is more of a challenge. As i let out of the clutch i notice i have to rev it up higher in hopes of taking off without it stuttering. A few days ago I let out of the clutch and tried to just ease into 1st and the car was jerking and bucking...i pressed in the clutch again for it to gather itself and it knocked it off when i tried again but i was rolling already from the previous attempt. i could have swore it was wheel hop but i dont have that kind of a beast. I was simply trying to ease into 1st gear from a light. Taking off from 2nd seems to help a bit more when this is going on. Im not sure if its a heat thing or some kind of sensor though. I noticed the other day, after it was bucking and I pulled in to get gas, the car was fine for a bit after i started it back up. Im not sure if its the gas, some sensor that the computer is reading, or just random luck that it worked fine.
Things I have done or noticed:
I have changed out the transmission fluid already trying to fix this and used Motorcraft Mercon V in it.
Replaced the spark plugs with Motorcraft Platinum plugs
I was thinking bad gas or perhaps theres some kind of water in the tank that was getting picked up by the fuel pump. So yesterday i filled up the tank and put some royal purple max octane in there in hopes of drying up anything and cleaning out the injectors. The jury is still out on that. Perhaps im on the right path and would need more treatments with a few fill ups.
When this was bucking and jerking like it was at the light i had less than a quarter tank of fuel left. The time before that it happened like that i believe it was that low as well but I cant swear to it.
The car is lightly modded. Nothing major really at all.
75mm intake
CAI
No EGR
New O2 sensors with rear MIL eliminators (although the codes are still showing for the rears but i didnt change them out or add the MIL eliminators until the codes showed up)
A 93 Octane Bama tune (was doing this though with my predator tuner as well)
Long tubes
3:73 gear
Underdrive pulley kit (for the love of God if any of you have the stock crank/water pump/alternator pulleys and dont want them send them my way. I want to replace them with the stock ones)
Nothing really major done to the car other than above.
Known issues with the car though:
Suspected valve stem seal leak on passenger head. If i let it idle for long periods of time blue smoke will eventually come out the back when i rev it up until it clears out. Doesnt do it when driving or sitting at lights (unless the light is like 10 mins long and i have been driving it for a while).
Battery light comes on almost all the time. Its 100% due to that under drive pulley kit that I didnt put on that I really want to replace with stock.
Any ideas what it could be? Was thinking i will check the MAF to make sure its clean and check that filter to make sure its clean too.
I am going to try my best to explain what im talking about here and hope someone has some ideas.
When i first start up my car it shifts smooth as butter into first and then into second. Dont have any issues. Its as if the idle is just perfect and things slip right where it needs to go. As the motor heats up though, and i drive it a lot, it starts to get more jerky when shifting into 1st and second. Eventually i find at a light, when its been driven a bit and its good and hot, that getting the car going in 1st is more of a challenge. As i let out of the clutch i notice i have to rev it up higher in hopes of taking off without it stuttering. A few days ago I let out of the clutch and tried to just ease into 1st and the car was jerking and bucking...i pressed in the clutch again for it to gather itself and it knocked it off when i tried again but i was rolling already from the previous attempt. i could have swore it was wheel hop but i dont have that kind of a beast. I was simply trying to ease into 1st gear from a light. Taking off from 2nd seems to help a bit more when this is going on. Im not sure if its a heat thing or some kind of sensor though. I noticed the other day, after it was bucking and I pulled in to get gas, the car was fine for a bit after i started it back up. Im not sure if its the gas, some sensor that the computer is reading, or just random luck that it worked fine.
Things I have done or noticed:
I have changed out the transmission fluid already trying to fix this and used Motorcraft Mercon V in it.
Replaced the spark plugs with Motorcraft Platinum plugs
I was thinking bad gas or perhaps theres some kind of water in the tank that was getting picked up by the fuel pump. So yesterday i filled up the tank and put some royal purple max octane in there in hopes of drying up anything and cleaning out the injectors. The jury is still out on that. Perhaps im on the right path and would need more treatments with a few fill ups.
When this was bucking and jerking like it was at the light i had less than a quarter tank of fuel left. The time before that it happened like that i believe it was that low as well but I cant swear to it.
The car is lightly modded. Nothing major really at all.
75mm intake
CAI
No EGR
New O2 sensors with rear MIL eliminators (although the codes are still showing for the rears but i didnt change them out or add the MIL eliminators until the codes showed up)
A 93 Octane Bama tune (was doing this though with my predator tuner as well)
Long tubes
3:73 gear
Underdrive pulley kit (for the love of God if any of you have the stock crank/water pump/alternator pulleys and dont want them send them my way. I want to replace them with the stock ones)
Nothing really major done to the car other than above.
Known issues with the car though:
Suspected valve stem seal leak on passenger head. If i let it idle for long periods of time blue smoke will eventually come out the back when i rev it up until it clears out. Doesnt do it when driving or sitting at lights (unless the light is like 10 mins long and i have been driving it for a while).
Battery light comes on almost all the time. Its 100% due to that under drive pulley kit that I didnt put on that I really want to replace with stock.
Any ideas what it could be? Was thinking i will check the MAF to make sure its clean and check that filter to make sure its clean too.
Last edited: