Ok this isn't my car but a friends. We have been trying to fix this for a while now. The car, 89 TTA, he picked up off of ebay about a year ago. The car ran fine when he got it but shortly after it started having problems. When cruising and the motor is at 1500 to 2000 rpm the car will start to buck/surge/miss. Once it starts doing this and it will not quit until it is out of this range.
What is known about the car
TA 49 turbo (15 psi)
009 injectors
New adjustable fuel pressure regulator (set at 42psi)
ATR plug wires
New spark plugs
3" THDP
Test PiPe
ATR cat-back exhaust
ATR dial-a-boost
Reds 93 chip
Walbro fuel pump
new egr valve
62mm throttle body
throttle body coolant bypass
Tps is at .42 idle 4.56 at wot. What we have tried is swapping stuff out of my 87 T and seeing if it goes away. So far we have swapped out the following:
Computer
Chip from another buddy with 009's
Coil Pack with Module
MAF
Throttle position sensor
ESC module
Nothing made a difference.
When he replaced the throttle body these symptoms seemed to go away but are now back. The car is now starting to "hunt" for an idle. BLM's in gear about 128 in park and 140 in gear sitting still.
Fuel pressure goes up 1:1 when getting into boost and fuel pressure stays when you shut the car off.
What could be causing this? We were thinking IAC, or O2 sensor.
Thanks in advance,
What is known about the car
TA 49 turbo (15 psi)
009 injectors
New adjustable fuel pressure regulator (set at 42psi)
ATR plug wires
New spark plugs
3" THDP
Test PiPe
ATR cat-back exhaust
ATR dial-a-boost
Reds 93 chip
Walbro fuel pump
new egr valve
62mm throttle body
throttle body coolant bypass
Tps is at .42 idle 4.56 at wot. What we have tried is swapping stuff out of my 87 T and seeing if it goes away. So far we have swapped out the following:
Computer
Chip from another buddy with 009's
Coil Pack with Module
MAF
Throttle position sensor
ESC module
Nothing made a difference.
When he replaced the throttle body these symptoms seemed to go away but are now back. The car is now starting to "hunt" for an idle. BLM's in gear about 128 in park and 140 in gear sitting still.
Fuel pressure goes up 1:1 when getting into boost and fuel pressure stays when you shut the car off.
What could be causing this? We were thinking IAC, or O2 sensor.
Thanks in advance,