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99' Alero - 3500/4T45-E swap. DTCS/ECT
4t45-e from a 05' Grand AM GT (3.29.) The car has been sitting for about a
year and half so maybe some damage happened over that time. Mileage -
12,798 currently. It does have diff inserts so not sure if that makes a
difference.
The only code I get.
[PCM] P1810 - TFP Valve Position Switch Circuit (SES) (Old) (History) (Current) (Immature)
The IAT is NIL (bad sensor/wiring not sure yet.) Not sure if that could cause
a issue with the pressure. It really feels like it's not getting enough when it's
acting up.
This happens every other time I drive it. It doesn't seem to have a pattern.
It will happen when it's hot or cold.
It feel like a really hard shift/slightly jams into gear making a clunking like noise. Either way it's very aggressive. There is a complete lose of power above 4000 RPM and from 2500-4000RPM (under moderate acceleration --- maybe 30-50% TP) it'll jump like the clutch is engaging and disengaging. If you run it 100% it will have little to no power above 4000 RPM and hit the rev limiter and not shift until you back off the gas.
I updated the FDR to 3.29 in the VCM editor. I grabbed a stock Grand AM GT
tune and copy/pasted all the transmission specs. Disabled Abuse mode/torque
reduction.
I don't know if the original sensor was moved from the old transmission or if
it's the one that came with it. I need to check tomorrow if they are the same
sensor. If they aren't, I may pickup both and just move them in and out
and see if it helps.
Any advice would be welcomed. Thanks!
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