maxitoman007
Member
- Joined
- Feb 15, 2017
- Location
- Calgary, Alberta, Canada
So I just recently completed a head gasket job as well as a wire tuck on my 740 turbo. Now the car is extremely sluggish off the line and jerks during acceleration. This only happens until around 4k rpm where the power finally comes back on. My first thought was that I skipped a tooth on the timing belt and that my timing was now extremely retarded resulting in the powerband being shifted way up, but I checked the timing marks and all seems well. I do also have a wideband and nothing abnormal seemed to be happening with the AFRs
It is a very odd sensation. Pedal to the floor in second and you can hear the turbo spooling, see it build to 15 psi (out of 23) on the gauge but feel nothing going to the ground, that is until 4k. Not feeling the power makes me think boost leak but then it wouldn't have shown boost building on the gauge either.
To me it still seems like timing although this wouldn't explain the rough acceleration. Other things I've thought could be causing it is the knock sensor (which can pull timing).
Any input is appreciated. the car ran great before aside from the coolant spraying out from the head gasket. It ran much better than it does now.
It is a very odd sensation. Pedal to the floor in second and you can hear the turbo spooling, see it build to 15 psi (out of 23) on the gauge but feel nothing going to the ground, that is until 4k. Not feeling the power makes me think boost leak but then it wouldn't have shown boost building on the gauge either.
To me it still seems like timing although this wouldn't explain the rough acceleration. Other things I've thought could be causing it is the knock sensor (which can pull timing).
Any input is appreciated. the car ran great before aside from the coolant spraying out from the head gasket. It ran much better than it does now.
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