2000 VW 1.8T - Rough Idle, Stalling and Limp Mode

[The Critic]

Vehicle: 2000 Beetle 1.8T Complaints: 1) Hard Start when cold, stalling 2) Vehicle won’t accelerate past 2500rpm when cold (sounds like it’s in limp mode), EPC and ASR lights are on 3) Vehicle operates normally when warm, but with a slight rough idle. Notes: 1) After clearing faults, only the P1116 is active. However, I have not re-scanned the vehicle after a cold start. 2) Past service history indicates prior issue with throttle body after cleaning and multiple adaptations. I think I need to re-scan the vehicle (after a cold start), replace the upstream oxygen sensor and check for bad grounds. What do you guys think? See scan from VAG-COM:

Quote:

VCDS Version: Release 14.10.2 (x64) Data version: 20150311 www.Ross-Tech.com Monday,20,April,2015,19:42:27:58785 Chassis Type: 9C - VW New Beetle (1999 > 2010) Scan: 01 02 03 08 15 17 19 22 25 26 29 35 37 39 46 54 56 65 75 Mileage: 206600km-128375miles ------------------------------------------------------------------------------- Address 01: Engine Labels: 06A-906-032-AVC.lbl Part No: 06A 906 032 C Component: 1.8l 5VT NB HS G 3077 Coding: 00001 Shop #: WSC 00066 VCID: 1E339F4B9A5274D17C3-5140 16 Faults Found: 17967 - Throttle Body (J338) P1559 - 35-10 - Fault in basic settings - Intermittent 16486 - Mass Air Flow Sensor (G70) P0102 - 35-10 - Signal too Low - Intermittent 17524 - Oxygen (Lambda) Sensor Heating; B1 S1 P1116 - 35-00 - Open Circuit 16684 - Random/Multiple Cylinder Misfire Detected P0300 - 35-10 - - Intermittent 16688 - Cylinder 4 P0304 - 35-10 - Misfire Detected - Intermittent 17633 - Fuel Injector for Cylinder 1 (N30) P1225 - 35-10 - Short to Ground - Intermittent 17635 - Fuel Injector for Cylinder 3 (N32) P1227 - 35-10 - Short to Ground - Intermittent 17636 - Fuel Injector for Cylinder 4 (N33) P1228 - 35-10 - Short to Ground - Intermittent 17634 - Fuel Injector for Cylinder 2 (N31) P1226 - 35-10 - Short to Ground - Intermittent 17833 - EVAP Purge Valve (N80) P1425 - 35-10 - Short to Ground - Intermittent 17955 - Boost Pressure Regulation Valve (N75) P1547 - 35-10 - Short to Ground - Intermittent 17525 - Oxygen (Lambda) Sensor Heating Circuit: B1 S2 P1117 - 35-10 - Short to Ground - Intermittent 17843 - Secondary Air Pump Relay (J299) P1435 - 35-10 - Short to Ground - Intermittent 17829 - Secondary Air Injection Solenoid Valve (N112) P1421 - 35-10 - Short to Ground - Intermittent 17697 - Boost Pressure Control Valve (N249) P1289 - 35-10 - Short to Ground - Intermittent 17953 - Throttle Valve Controller P1545 - 35-10 - Malfunction - Intermittent Readiness: 0000 1000 ------------------------------------------------------------------------------- Address 03: ABS Brakes Labels: 1J0-907-37x-ABS.lbl Part No: 1J0 907 379 AF Component: ASR 20 IE CAN 0001 Coding: 13204 Shop #: WSC 00066 VCID: 75E1A0E74F2497894D9-4B00 No fault code found. ------------------------------------------------------------------------------- Address 15: Airbags Labels: 6Q0-909-605-VW5.lbl Part No: 6Q0 909 605 A Component: 06 AIRBAG VW5 0004 Coding: 12342 Shop #: WSC 00066 VCID: 356160E70FA4D7898D9-4B00 No fault code found. ------------------------------------------------------------------------------- Address 17: Instruments Labels: 1C0-920-xx0.lbl Part No: 1C0 920 901 F Component: KOMBI+WEGFAHRS. M73 V07 Coding: 07202 Shop #: WSC 00000 VCID: 1F4DA24F9D587DD9775-4B00 Subsystem 1 - Part No: Ident Component: Nr. Wegfahrs.:VWZ5Z0Y1181414 Ident.-Nr. Wegfahrs.:VWZ5Z0Y1181414 No fault code found. ------------------------------------------------------------------------------- Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl Part No: 6N0 909 901 Component: Gateway K<->CAN V072 Coding: 00006 Shop #: WSC 00066 VCID: 70EF91F33046B2A19EF-4B00 No fault code found. ------------------------------------------------------------------------------- Address 46: Central Conv. Labels: 1J0-959-799.lbl Part No: 1J0 959 799 AJ Component: 5X Zentral-SG Komf. 0001 Coding: 00256 Shop #: WSC 00066 VCID: 0603D72B22C28C11543-4B00 Subsystem 1 - Part No: 1J2959802C Component: 5X Tõrsteuerger. FS0002r Subsystem 2 - Part No: 1J2959801D Component: 5X Tõrsteuerger. BF0002r 2 Faults Found: 00943 - Heated Exterior Mirror; Driver Side (Z4) 35-00 - - 00944 - Heated Exterior Mirror; Passenger Side (Z5) 35-00 - - ------------------------------------------------------------------------------- Address 54: Rear Spoiler Labels: 1C0-959-733.lbl Part No: 1C0 959 733 B Component: Heckspoiler 0002 VCID: 2A5B439BD61A887110B-51B6 No fault code found. End-------------------------(Elapsed Time: 04:11)--------------------------

 

[Quattro Pete]

Does this help at all? http://wiki.ross-tech.com/wiki/index.php/17524/P1116/004374

 

[Kamele0N]

Check well known problem with these engines first....clogged breather (hose) for oil vapors in engine head...

 

[BRZED]

Check the coolant temperature sensor. If it is defective, on many cars the engine will run in limp mode.

 

[Trav]

O2 sensor heater. Check it for power and good ground when cold if its good change the front o2.

 

[Gtiguy34]

Most of those faults are probably erroneous, if I remember correctly a bad fuel pump relay or main relay will cause all of the open circuit faults. I would start there and see what comes back.

 

[threeputtpar]

What value are you seeing in Engine Group 001 in place 2? That will be the CTS reading from the coolant, and what you describe sounds like it should be reading a real weird number when the engine is cold and it doesn't know what A/F ratio to run until it actually warms up. Common VAG issue from 1998 - 2006. The updated CTS should be bright green instead of black or blue. Here's the link to the table of Group numbers: http://www.ross-tech.com/vag-com/m_blocks/

 

[Trav]

Originally Posted By: Trav

O2 sensor heater. Check it for power and good ground when cold if its good change the front o2.

This is probably wrong. I didn't see all the codes you had from the scan tool. Even if it had a bad heater circuit it wouldn't cause all that.

 

[CBR.worm]

Bad ECU? Bad ground?