I think my problem has gone beyond "stupid questions" so I'm making this thread to try to figure out this problem.
I'll take it from the beginning...
Last Saturday I had the car flash tuned by Merlin. Car had no issues I'm aware of prior to this day, apart from poor fuel consumption. Car ran fine that day during the tuning until I headed home later that night, I go to accelerate hard from 80-120 in 3rd gear and the car starts jolting, as though its hitting fuel cut, although not as violent as people describe fuel cut. At first I thought it was boost cut but after putting boost down to 12psi it still happens, when previously I was running 14+ psi without issue.
Once this problem starts occurring it will do it over and over no matter what the gear, just gotta give it some boost and revs. Testing it on short trips it does not seem to happen.
earlier In the week I posted my error codes
Engine
1A No.1 cylinder accidental fire detection
ABS
21 FR wheel speed sensor system
AYC
41 TPS system (short or break)
After resetting the codes and driving until the problem showed itself I have checked the codes again
ABS
- 21 FR wheel speed sensor system
Which I think is unrelated to my current problem? surely...
I think my accident cylinder fire might of happened because I kept my foot on the gas to long while my engine was jolting, forcing a miss fire. So the jolting isn't actually a miss fire itself.
I was really surprised that I did not get the TPS error again, as over the last week my car has idle has been hunting and usually settling at about 2k rpm, and it also feels like its still on throttle slightly when my foot is off the pedal. I was sure this was my throttle position sensor, but no error!?
So to sum it up, car is jolting under load at highish revs causing a miss fire in the worst cases, idle is all over the shop and I'm not getting any error code to tell me whats wrong. help
Let me know if I have left out any important information
I'm not doubting Merlin's skill as a tuner as I have witnessed for myself how well he knows our cars, but I have to ask the question, Is it possible a mistake has been made that causes this problem? A miss click or wrong key perhaps? If you read this Dave, let me know as I would like to rule this out as a possibility.
A little info about my car
99 facelift auto legnum type s
Stock apart from boost T running 12-13 psi
I'll take it from the beginning...
Last Saturday I had the car flash tuned by Merlin. Car had no issues I'm aware of prior to this day, apart from poor fuel consumption. Car ran fine that day during the tuning until I headed home later that night, I go to accelerate hard from 80-120 in 3rd gear and the car starts jolting, as though its hitting fuel cut, although not as violent as people describe fuel cut. At first I thought it was boost cut but after putting boost down to 12psi it still happens, when previously I was running 14+ psi without issue.
Once this problem starts occurring it will do it over and over no matter what the gear, just gotta give it some boost and revs. Testing it on short trips it does not seem to happen.
earlier In the week I posted my error codes
Engine
1A No.1 cylinder accidental fire detection
ABS
21 FR wheel speed sensor system
AYC
41 TPS system (short or break)
After resetting the codes and driving until the problem showed itself I have checked the codes again
ABS
- 21 FR wheel speed sensor system
Which I think is unrelated to my current problem? surely...
I think my accident cylinder fire might of happened because I kept my foot on the gas to long while my engine was jolting, forcing a miss fire. So the jolting isn't actually a miss fire itself.
I was really surprised that I did not get the TPS error again, as over the last week my car has idle has been hunting and usually settling at about 2k rpm, and it also feels like its still on throttle slightly when my foot is off the pedal. I was sure this was my throttle position sensor, but no error!?
So to sum it up, car is jolting under load at highish revs causing a miss fire in the worst cases, idle is all over the shop and I'm not getting any error code to tell me whats wrong. help
Let me know if I have left out any important information
I'm not doubting Merlin's skill as a tuner as I have witnessed for myself how well he knows our cars, but I have to ask the question, Is it possible a mistake has been made that causes this problem? A miss click or wrong key perhaps? If you read this Dave, let me know as I would like to rule this out as a possibility.
A little info about my car
99 facelift auto legnum type s
Stock apart from boost T running 12-13 psi