2002 V70 XC 2.4 Petrol - P0172 Lumpy / unstable idle

J4ck100 · Jul 8th, 2020, 21:47

Hi everyone

In a bit of a panic as I went to start my car today and the revs started hunting and it was generally all over the place and nearly self stalling - basically running like a bag of spanners out of the blue

I’ve just plugged in and received code P0172 - bank 1 too rich

I then tried to start the car without the MAF sensor plugged in and she’s stable again

Any ideas?

Thanks
Jack

JoeNinety · Jul 8th, 2020, 22:44

MAF sensor ?

J4ck100 · Jul 8th, 2020, 23:06

Going to give cleaning a shot tomorrow!

I know they are easy to remove on 2.4 N/A

Equally so on turbo models?

Thanks!

J4ck100 · Jul 9th, 2020, 14:51

OK so cleaned the MAF sensor, absolutely no luck.

Engine turns over fine but as soon as you re-connect the MAF everything falls apart and it starts to stutter until it dies.

Going to try a replacement MAF.

J4ck100 · Jul 12th, 2020, 11:25

New MAF installed and exactly the same symptoms

Start with MAF unplugged, fires up fine and idles smooth

The second you connect the (new) MAF, the engine stumbles and dies immediately

What could this be if it’s not the MAF sensor? Racking my brains

J4ck100 · Jul 12th, 2020, 17:57

Resolved: flat battery, totally perplexed me

Thanks

Jul 8th, 2020, 21:47	#1
J4ck100 Junior Member Last Online: Aug 17th, 2020 11:57 Join Date: Aug 2013 Location: Kingston-upon-Thames	2002 V70 XC 2.4 Petrol - P0172 Lumpy / unstable idle Hi everyone In a bit of a panic as I went to start my car today and the revs started hunting and it was generally all over the place and nearly self stalling - basically running like a bag of spanners out of the blue I’ve just plugged in and received code P0172 - bank 1 too rich I then tried to start the car without the MAF sensor plugged in and she’s stable again Any ideas? Thanks Jack

Jul 8th, 2020, 22:44	#2
JoeNinety Senior Member Last Online: Today 19:59 Join Date: May 2019 Location: Winchester	MAF sensor ? __________________ V70 P2 2006 2.4 Petrol 170bhp Est SE Automatic (5 speed) MG Midget Mk1 1962 Previous: RR TDV8 3.6 '08; RR TD6 3.0 '02; RR P38A V8 '99; Audi A4 Cab 3.0 V6 2004; Volvo 740 GLE Est 1989 Have VIDA & VXDIAG NANO on W10Pro - happy to help

Jul 8th, 2020, 23:06	#3
J4ck100 Junior Member Last Online: Aug 17th, 2020 11:57 Join Date: Aug 2013 Location: Kingston-upon-Thames	Going to give cleaning a shot tomorrow! I know they are easy to remove on 2.4 N/A Equally so on turbo models? Thanks!

Jul 9th, 2020, 14:51	#4
J4ck100 Junior Member Last Online: Aug 17th, 2020 11:57 Join Date: Aug 2013 Location: Kingston-upon-Thames	OK so cleaned the MAF sensor, absolutely no luck. Engine turns over fine but as soon as you re-connect the MAF everything falls apart and it starts to stutter until it dies. Going to try a replacement MAF.

Jul 12th, 2020, 11:25	#5
J4ck100 Junior Member Last Online: Aug 17th, 2020 11:57 Join Date: Aug 2013 Location: Kingston-upon-Thames	New MAF installed and exactly the same symptoms Start with MAF unplugged, fires up fine and idles smooth The second you connect the (new) MAF, the engine stumbles and dies immediately What could this be if it’s not the MAF sensor? Racking my brains

Jul 12th, 2020, 17:57	#6
J4ck100 Junior Member Last Online: Aug 17th, 2020 11:57 Join Date: Aug 2013 Location: Kingston-upon-Thames	Resolved: flat battery, totally perplexed me Thanks

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