Hey everybody
I'm new to posting to the forum but have been using it to troubleshoot a bunch on my P5 - thanks for all your help! This one's a call to arms, i'm completely stumped and haven't been able to find much information about my symptoms anywhere. Some back info (and please let me know if i need to put up more information): 2002 P5 160,000 miles, auto/tiptronic trans, cold air intake is the only upgrade to the engine, bought the car at 140k has been good to me up until now..
Symptoms: Surging at highway speeds, surging seemingly only after engine has heated up. Does surge intermittently at low speeds as well but much more rarely. Has gotten to the point where i can get past 45mph without the engine racing/darting. NO PROBLEMS WITH SURGING WHILE USING TIPTRONIC. Car idles great.
After some research i figured i was having issues with the intake as i did very recent to this issue have the CAI pop off at the boot on the intake manifold from it rubbing up against the master cylinder a few times. With it surging at high torque i came to the infamous P0660 VTCS manifold problem - code was "confirmed" by the first auto shop i took it to - said the actuators that control the butterflies within the manifold werent opening enough.
The estimate from the shop was $800+.
Did more research. Actuators are controlled by vacuum. I made sure i was getting supply to the VTCS and VICS solenoids, checked the resistance, even went to the junkyard and swapped them out. No issue. I was getting vacuum. The one was engaging during the cold start/closing at temp. The other was opening and closing as well. i bought a scan tool, havent gotten the P0060 code again yet. Still surging.
About to take the car to a trans shop just bc the surging isnt happening in tiptronic. This would be the 3rd shop and im already 300$ in (not including the tools i bought for myself) on a college budget and desperate.. anything suggestions??
I'm new to posting to the forum but have been using it to troubleshoot a bunch on my P5 - thanks for all your help! This one's a call to arms, i'm completely stumped and haven't been able to find much information about my symptoms anywhere. Some back info (and please let me know if i need to put up more information): 2002 P5 160,000 miles, auto/tiptronic trans, cold air intake is the only upgrade to the engine, bought the car at 140k has been good to me up until now..
Symptoms: Surging at highway speeds, surging seemingly only after engine has heated up. Does surge intermittently at low speeds as well but much more rarely. Has gotten to the point where i can get past 45mph without the engine racing/darting. NO PROBLEMS WITH SURGING WHILE USING TIPTRONIC. Car idles great.
After some research i figured i was having issues with the intake as i did very recent to this issue have the CAI pop off at the boot on the intake manifold from it rubbing up against the master cylinder a few times. With it surging at high torque i came to the infamous P0660 VTCS manifold problem - code was "confirmed" by the first auto shop i took it to - said the actuators that control the butterflies within the manifold werent opening enough.
The estimate from the shop was $800+.
Did more research. Actuators are controlled by vacuum. I made sure i was getting supply to the VTCS and VICS solenoids, checked the resistance, even went to the junkyard and swapped them out. No issue. I was getting vacuum. The one was engaging during the cold start/closing at temp. The other was opening and closing as well. i bought a scan tool, havent gotten the P0060 code again yet. Still surging.
About to take the car to a trans shop just bc the surging isnt happening in tiptronic. This would be the 3rd shop and im already 300$ in (not including the tools i bought for myself) on a college budget and desperate.. anything suggestions??
