liloldbie
Veteran Member
I recently picked up a 2001 Jetta with the dreaded O1M with 212,800 and counting. As with every failing transmission it does have a slight surging issue at speed and the torque converter slip between gears. It is manageable in my short commutes to where it is a non-issue. On my commute home from Maine I achieved almost 500 miles on my tank before the fuel light came home netting around 41 mpg traveling at an average speed of 73 mph.
Fast forward a tank or two to now. I am likely to see less than 400 miles on this tank. Temperatures are in the low single digits and my commute is roughly 8-15 miles one way so the car barely has time to warm up. I'm sure it also doesn't help that I am constantly going up or down hills and all back roads with stop signs.
Known issues:
Slipping O1M
Low Temps (single digits)
Does not reach 190* (faulty sensor? tstat?)
16" Blizzaks @ 37 psi
Faulty Wastegate Actuator
I do occasionally see an over boost code when traveling up hills. I just have to cycle the ignition and all power is back. I don't believe I am down on power other than when I hit limp mode.
Plans:
5-speed swap coming (thanks jbleu)
New coolant temp sensor
New thermostat
New wastegate actuator
Wondering if what I have planned here can regain my lost mileage? Am I stuck with sub par mileage due to weather and commute? I was thinking that swapping in a set of Bosio 520's and a tune could help my mileage after I fix my overboost problem up hills. If an actuator doesn't fix my issue I was thinking VNT-17 and a tune to compliment. Let me know what you guys think.
I do have vag com so I am able to check various things such as IQ, Injection timing, etc etc. Not really sure where to start I guess.
Fast forward a tank or two to now. I am likely to see less than 400 miles on this tank. Temperatures are in the low single digits and my commute is roughly 8-15 miles one way so the car barely has time to warm up. I'm sure it also doesn't help that I am constantly going up or down hills and all back roads with stop signs.
Known issues:
Slipping O1M
Low Temps (single digits)
Does not reach 190* (faulty sensor? tstat?)
16" Blizzaks @ 37 psi
Faulty Wastegate Actuator
I do occasionally see an over boost code when traveling up hills. I just have to cycle the ignition and all power is back. I don't believe I am down on power other than when I hit limp mode.
Plans:
5-speed swap coming (thanks jbleu)
New coolant temp sensor
New thermostat
New wastegate actuator
Wondering if what I have planned here can regain my lost mileage? Am I stuck with sub par mileage due to weather and commute? I was thinking that swapping in a set of Bosio 520's and a tune could help my mileage after I fix my overboost problem up hills. If an actuator doesn't fix my issue I was thinking VNT-17 and a tune to compliment. Let me know what you guys think.
I do have vag com so I am able to check various things such as IQ, Injection timing, etc etc. Not really sure where to start I guess.
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