jrank001
Active member
Hi All:
This won’t be short but please read and maybe you can help me.
I have a 05 Jetta Wagon, MK4 style with BEW 1.9 TDI motor and a triptonic automatic transmission. For the past year my car has acted, from what I'm told, likes it's going into limp mode.
I start the car, it runs great and then after awhile, rather quickly actually, it will not have any power. I'll floor the accelerator from a dead stop or entering a highway entrance ramp and the car just goes nowhere. Does not down shift into first like normally and I don’t feel that boost of the turbo nothing.
I was going downhill yesterday with the accelerator floored and the car would not shift till I hit 4,500 rpms and then it didn’t seem right. On a flat surface it will not shift at all and going uphill I’ll lose speed.
I can get the car to shift manually and it goes through the gears but once I shift it back to “D” it goes right back to the lower gear it was in when it wouldn’t shift. Make sense?
I went to my local trusted mechanic and we did a trace to the N75 actuator and everything seemed fine. I think it might be this.
We really ran into a dead end after that because it still did the same problem so I took the car to a shop I know of a (reputable garage. I trust them) two days ago to replace a faulty T-Stat and flush the heater core and check the limp issue. I did that yesterday. There was no check engine warning light or engine code when they put it on the scanner but it did read low turbo boost. We think its MAFS related.
Now here is the wrench in the mix. I unplug my Mass Air Flow Sensor (MAFS) and the car runs perfect. I replaced two MAFS now and each one when plugged in the symptoms are back.
However these are not BOSCH OEM MAFS parts. These are aftermarket parts. This one here
The garage I took the car to were scratching their heads. I understand that there are tons of post on this same issue. But when my area trusted mechanic cant figure this out I decided to write here on the forum. I've read a lot of post on this but what confused me is why does this car run great when the MAFS is unplugged? I cant seem to get an answer.
With the MAFS plugged in the car has no power, the turbo will not boost or shift correctly.
When it’s unplugged the car runs fine. The only error codes I did have in the past were 19559-Intake flap manifold & 16683-boost pressure regulation.
Any ideas?
This won’t be short but please read and maybe you can help me.
I have a 05 Jetta Wagon, MK4 style with BEW 1.9 TDI motor and a triptonic automatic transmission. For the past year my car has acted, from what I'm told, likes it's going into limp mode.
I start the car, it runs great and then after awhile, rather quickly actually, it will not have any power. I'll floor the accelerator from a dead stop or entering a highway entrance ramp and the car just goes nowhere. Does not down shift into first like normally and I don’t feel that boost of the turbo nothing.
I was going downhill yesterday with the accelerator floored and the car would not shift till I hit 4,500 rpms and then it didn’t seem right. On a flat surface it will not shift at all and going uphill I’ll lose speed.
I can get the car to shift manually and it goes through the gears but once I shift it back to “D” it goes right back to the lower gear it was in when it wouldn’t shift. Make sense?
I went to my local trusted mechanic and we did a trace to the N75 actuator and everything seemed fine. I think it might be this.
We really ran into a dead end after that because it still did the same problem so I took the car to a shop I know of a (reputable garage. I trust them) two days ago to replace a faulty T-Stat and flush the heater core and check the limp issue. I did that yesterday. There was no check engine warning light or engine code when they put it on the scanner but it did read low turbo boost. We think its MAFS related.
Now here is the wrench in the mix. I unplug my Mass Air Flow Sensor (MAFS) and the car runs perfect. I replaced two MAFS now and each one when plugged in the symptoms are back.
However these are not BOSCH OEM MAFS parts. These are aftermarket parts. This one here
The garage I took the car to were scratching their heads. I understand that there are tons of post on this same issue. But when my area trusted mechanic cant figure this out I decided to write here on the forum. I've read a lot of post on this but what confused me is why does this car run great when the MAFS is unplugged? I cant seem to get an answer.
With the MAFS plugged in the car has no power, the turbo will not boost or shift correctly.
When it’s unplugged the car runs fine. The only error codes I did have in the past were 19559-Intake flap manifold & 16683-boost pressure regulation.
Any ideas?
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