My 03 wagon has a strange one. I started the car yesterday, and it rev'd up for a split second like I had my foot on the accelerator pedal (I did not). When I took off, I had boost, but only 10-12 psi. The car has a Malone stage 3 and runs 18psi normally.
Boost built normal, but the car never seemed to up the fuel and take off. Very little power. After driving it with my foot to the floor and making 12psi of boost for 30 seconds or so, it went into limp mode and fully opened the turbo vanes (I can hear it easily because of straight of pipe).
A restart will allow the turbo vanes to close and the turbo to make boost (but only 10-12 psi and not power at all). It has no more power with 10psi than it does with 0 psi. It is acting like the ECU is not adding any fuel whatsoever.
I did kick out code P1556 charge pressure negative deviation. I have not had a chance to get the VAGCOM on i it. I did a quick roadside test and the vac line to the turbo holds mouth vacuum, and I can move the vanes by sucking on the line. No obvious boost leaks.
Unplugging the MAF makes zero difference.
I did notice that my generic scan gauge registers 28-30" of HG when the boost gauge reads zero, and increases as the gauge moves up. I dont know if that readout is absolute or gauge pressure.
I am a bit stumped, I've had limp mode before, but not like this. Making half boost but zero power whatsoever!
It now does the automatic throttle blip about half the times I start the car, its quite obnoxious.
Any ideas?
Boost built normal, but the car never seemed to up the fuel and take off. Very little power. After driving it with my foot to the floor and making 12psi of boost for 30 seconds or so, it went into limp mode and fully opened the turbo vanes (I can hear it easily because of straight of pipe).
A restart will allow the turbo vanes to close and the turbo to make boost (but only 10-12 psi and not power at all). It has no more power with 10psi than it does with 0 psi. It is acting like the ECU is not adding any fuel whatsoever.
I did kick out code P1556 charge pressure negative deviation. I have not had a chance to get the VAGCOM on i it. I did a quick roadside test and the vac line to the turbo holds mouth vacuum, and I can move the vanes by sucking on the line. No obvious boost leaks.
Unplugging the MAF makes zero difference.
I did notice that my generic scan gauge registers 28-30" of HG when the boost gauge reads zero, and increases as the gauge moves up. I dont know if that readout is absolute or gauge pressure.
I am a bit stumped, I've had limp mode before, but not like this. Making half boost but zero power whatsoever!
It now does the automatic throttle blip about half the times I start the car, its quite obnoxious.
Any ideas?
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