Help. Crap idle from cold

MAZI · Dec 3rd, 2017, 00:05

Hi

Recently purchased a lovely mint low mileage V70 XC 5cyl Petrol Manual.
It seems to hunt at idle especially so from cold.

So far tried:
Turbo actuator sensor thingy (sorry)
Maf
Checked for air leaks
Coolant temp sensor

Still the same. And now engine management light is on
Checked codes using my Delphi laptop based diagnostics and have the following apparantly useless info,
1B941 UNKNOWN FAULT CODE
00681 UNKNOWN FAULT CODE
00901 UNKNOWN FAULT CODE

Any ideas??

INS60T · Dec 3rd, 2017, 09:00

How did you check the MAF etc?

Have you tried running the car with the MAF disconnected from a cold start and if you have, what happened?

Brendan W · Dec 3rd, 2017, 11:04

Have you tried cleaning the throttle body ?

oragex · Dec 3rd, 2017, 11:35

Let us know which year it is and how many miles on it

MAZI · Dec 4th, 2017, 13:15

2001 Y Reg
2.4T 5CYL Turbo

Tried a new MAF

Georgeandkira · Dec 4th, 2017, 16:55

Codes retrieved with a VIDA are likely to be more specific and useful.

Hunting at idle can point to a bad/worn ETM.

If there's a label on yours please provide its color (yellow or white). One indicates the ETM has been replaced.

MAZI · Dec 8th, 2017, 18:38

OK tried a different diagnostic machine and got this.

904c Throttle position (TP) sensor 1 and 2
9400 Brake pedal Sensor

Dec 3rd, 2017, 00:05	#1
MAZI New Member Last Online: Aug 25th, 2023 14:49 Join Date: Feb 2011 Location: Edinburgh	Help. Crap idle from cold Hi Recently purchased a lovely mint low mileage V70 XC 5cyl Petrol Manual. It seems to hunt at idle especially so from cold. So far tried: Turbo actuator sensor thingy (sorry) Maf Checked for air leaks Coolant temp sensor Still the same. And now engine management light is on Checked codes using my Delphi laptop based diagnostics and have the following apparantly useless info, 1B941 UNKNOWN FAULT CODE 00681 UNKNOWN FAULT CODE 00901 UNKNOWN FAULT CODE Any ideas??

Dec 3rd, 2017, 11:35	#4
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	Let us know which year it is and how many miles on it __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c

Dec 3rd, 2017, 09:00	#2
INS60T Junior Member Last Online: Dec 29th, 2023 20:33 Join Date: May 2015 Location: Beauly-ish	How did you check the MAF etc? Have you tried running the car with the MAF disconnected from a cold start and if you have, what happened?

Dec 3rd, 2017, 11:04	#3
Brendan W Premier Member Last Online: Apr 2nd, 2024 19:50 Join Date: Dec 2007 Location: Wexford	Have you tried cleaning the throttle body ?

Dec 4th, 2017, 13:15	#5
MAZI New Member Last Online: Aug 25th, 2023 14:49 Join Date: Feb 2011 Location: Edinburgh	2001 Y Reg 2.4T 5CYL Turbo Tried a new MAF

Dec 4th, 2017, 16:55	#6
Georgeandkira Premier Member Last Online: Apr 17th, 2024 16:59 Join Date: Feb 2009 Location: Hackensack	Codes retrieved with a VIDA are likely to be more specific and useful. Hunting at idle can point to a bad/worn ETM. If there's a label on yours please provide its color (yellow or white). One indicates the ETM has been replaced.

Dec 8th, 2017, 18:38	#7
MAZI New Member Last Online: Aug 25th, 2023 14:49 Join Date: Feb 2011 Location: Edinburgh	OK tried a different diagnostic machine and got this. 904c Throttle position (TP) sensor 1 and 2 9400 Brake pedal Sensor

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