Hey all,
I have an A4 B8 2.0 tdi (CJCB) which has been experiencing many issues recently. Initially, the car went in to limp mode because of the EGR becoming blocked. After failing to attempt to clean it due to the EGR valve for this particular engine being combined with the cooler, I resorted to getting it remapped out.
So on Saturday, I went to a mapper who performed the EGR delete and mapped the vehicle to stage 1. The car was running like a dream and the power increase was just what I was looking for. However, the issues began the next morning when I left for work. I started the car, and it idled fine. I started to drive for less than a mile, and then suddenly there was a loss of power. I noticed that any slight incline would make the power loss worse. The glow plug light would flash during this. Note that I was not over revving but just holding revs around 1,000-2,000. The car stuttered and hesitated, and there was a distinctive sound similar to when an engine is cold started in extreme cold temperatures.
This issue is only present in cold start. Once the engine is warm, everything is fine. I used an OBDII adapter to find out any fault codes, and the only code that appeared was "P0299 Turbocharger/Supercharger "A" Underboost Condition". I went back to the guy who mapped my vehicle, who checked it over and suggested to reduce the power to rectify the issue. He also advised that he believes the wastegate is not opening/closing properly which is causing the issue.
I searched the realms of Google and forums to find out any resolution to the fault code. Unfortunately, I couldn't find anyone with a similar experience. Does anyone have any advice on how to diagnose what is causing the issue? Any help would be much appreciated. Thanks.
tl;dr
A4 B8 2.0 tdi (CJCB). Had blocked EGR valve. Performed EGR delete and remap. Car now runs fine when warm. When cold however, engine stutter and hesitation. Fault code P0299 turbo underboost.
I have an A4 B8 2.0 tdi (CJCB) which has been experiencing many issues recently. Initially, the car went in to limp mode because of the EGR becoming blocked. After failing to attempt to clean it due to the EGR valve for this particular engine being combined with the cooler, I resorted to getting it remapped out.
So on Saturday, I went to a mapper who performed the EGR delete and mapped the vehicle to stage 1. The car was running like a dream and the power increase was just what I was looking for. However, the issues began the next morning when I left for work. I started the car, and it idled fine. I started to drive for less than a mile, and then suddenly there was a loss of power. I noticed that any slight incline would make the power loss worse. The glow plug light would flash during this. Note that I was not over revving but just holding revs around 1,000-2,000. The car stuttered and hesitated, and there was a distinctive sound similar to when an engine is cold started in extreme cold temperatures.
This issue is only present in cold start. Once the engine is warm, everything is fine. I used an OBDII adapter to find out any fault codes, and the only code that appeared was "P0299 Turbocharger/Supercharger "A" Underboost Condition". I went back to the guy who mapped my vehicle, who checked it over and suggested to reduce the power to rectify the issue. He also advised that he believes the wastegate is not opening/closing properly which is causing the issue.
I searched the realms of Google and forums to find out any resolution to the fault code. Unfortunately, I couldn't find anyone with a similar experience. Does anyone have any advice on how to diagnose what is causing the issue? Any help would be much appreciated. Thanks.
tl;dr
A4 B8 2.0 tdi (CJCB). Had blocked EGR valve. Performed EGR delete and remap. Car now runs fine when warm. When cold however, engine stutter and hesitation. Fault code P0299 turbo underboost.