Recently I went through an 80K servicing from a reputed Store on my 2001 Jetta 1.8T. During which they changed the Engine Gasket and the MAP sensor. They said that oil was leaking through the engine gasket.
I have been driving it reasonably well for about 4 weeks. Although all this while I noted a small drop in thrust while accelerating and a mild hissing noise as if air was leaking from somewhere.
Day before yesterday things started going really bad. Intially the RPM would keep fluctuating while idling and even stalled few times on red lights. Yesterday morning when I started the engine the EPC and ASR lights came up. After turning on and off a couple of times both went out but the MIL came up blinking from time to time. After that the engine would rev up to 2k when I start and then fall to 1k RPM. This was accompanied by frequent misfires. I took it to the dealer and they extracted all the fault codes(13 of them) and suggested that I change the Throttle Body at first and then only they can proceed further saying that the Throttle Body was not able to adapt. Following are the fault codes that I got
1570 Contr.Module Locked
1297 Connection turbocharger - throttle valve pressure hose
1564 Idle Speed Contr.Throttle Pos. Low Voltage During Adaptation
1171 Throttle Actuation Potentiometer Sign.2 Range/Performance
1542 Throttle Actuation Potentiometer Range/Performance
0300 Random/Multiple Cylinder Misfire Detected
0303 Cyl.3 Misfire Detected
0304 Cyl.4 Misfire Detected
0507 Idle Control System Higher than Expected
0301 Cyl.1 Misfire Detected
0302 Cyl.2 Misfire Detected
1136 Long Term Fuel Trim Add.Fuel,Bank1 System too Lean
1128 Long Term Fuel Trim mult.,Bank1 System too Lean
I am going nuts with all of them around and I am not able to decide whether to go ahead and change the TB from the dealer as it would cost about 800 bucks or whether to go after the Service Centre guys.
What I want to know is can the TB malfunction be connected to the Engine Gasket and MAP sensor replacement? And do the above symptoms mean that my TB is damaged beyond repair ?
I would really appreciate if someone can be my guiding star. I am heavily dependent on my car as I need to drive it close to 500 miles every week.
Thanking you in anticipation ....