General: 70: - Misfiring c70

comedywizard · Oct 14th, 2008, 20:17

Hi there,

Hope someone can help me. I have a '99 C70 2.4 GT, Auto, 109k regularly serviced. My car has started to give me intermitant problems, whereby it will run fine but all of a sudden will start misfiring / stuttering. If driving at constant speed its not that noticeable but has slight hesitation and the the revs will be slightly erratic. When coming to a stop the car feels as if its trying to stall and sounds lumpy / misfiring at tickover.

However if i switch the engine off and then restart it, it will runs fine again for a week or so. My initial thought is maybe coil pack or injector playing up but since it resets itself and runs fine again maybe an electrical gremlin??

I would be grateful for any advice, or solutions.

Kind regards
Dave

warthog · Oct 14th, 2008, 20:58

Hi,

may be way off here, but do a search on ETM or Electronic Throttle Module on this forum. I think you may be experiencing the symptoms of a failing ETM.

outnumbered · Oct 14th, 2008, 20:58

hi
its not the etm issue on your car is it, if so you can get a free clean and down load from your dealer,this is a short term fix then you will need a new one .
hope that helps.
mike

capt jack · Oct 14th, 2008, 21:00

Coil pack, lead, plug - could be. Add to the 'easy' list fuel filter, fuel pump relay, or fuel pump itself.

On the 'not so easy' list, it could be an engine sensor, vacuum leak, or even an ECU problem.

Worst of all it could be the dreaded ETM problem.

First question really ought to be do you have any fault codes or warning lights? Is the Check Engine light coming on at all?

Jack

comedywizard · Oct 15th, 2008, 17:25

Hi, thanks for the suggestions. I will keep an eye out for any warning lights and check everything is clean.
I hope its not the ETM problem as I had it cleaned a year ago when I replaced the ABS module with a brand new one from Volvo (cost a small fortune!).

Nunchukhamster · Oct 16th, 2008, 05:14

May also be a fubar'd MAF.

Oct 14th, 2008, 20:17	#1
comedywizard comedywizard Last Online: Nov 12th, 2011 11:51 Join Date: Jul 2006 Location: Cardiff	Misfiring c70 Hi there, Hope someone can help me. I have a '99 C70 2.4 GT, Auto, 109k regularly serviced. My car has started to give me intermitant problems, whereby it will run fine but all of a sudden will start misfiring / stuttering. If driving at constant speed its not that noticeable but has slight hesitation and the the revs will be slightly erratic. When coming to a stop the car feels as if its trying to stall and sounds lumpy / misfiring at tickover. However if i switch the engine off and then restart it, it will runs fine again for a week or so. My initial thought is maybe coil pack or injector playing up but since it resets itself and runs fine again maybe an electrical gremlin?? I would be grateful for any advice, or solutions. Kind regards Dave

Oct 14th, 2008, 20:58	#2
warthog VOC Member Last Online: Oct 30th, 2021 14:51 Join Date: Dec 2001 Location: Bristol	Hi, may be way off here, but do a search on ETM or Electronic Throttle Module on this forum. I think you may be experiencing the symptoms of a failing ETM. __________________ Brian '96 T5 Estate Auto

Oct 14th, 2008, 20:58	#3
outnumbered Lunatic from Wakefield Last Online: Apr 16th, 2023 06:33 Join Date: Dec 2004 Location: wakefield	hi its not the etm issue on your car is it, if so you can get a free clean and down load from your dealer,this is a short term fix then you will need a new one . hope that helps. mike __________________ 2012 volvo xc90 Executive Buccaneer Bermuda 2021

Oct 16th, 2008, 05:14	#6
Nunchukhamster Gone. Last Online: Aug 4th, 2009 09:14 Join Date: Jul 2007 Location: Zarg	May also be a fubar'd MAF. __________________ Bored of the idiots, the "victims" and the spammers who have taken over this forum.

Oct 14th, 2008, 21:00	#4
capt jack VOC Member Last Online: Yesterday 19:15 Join Date: Jun 2006 Location: Selby, North Yorkshire	Coil pack, lead, plug - could be. Add to the 'easy' list fuel filter, fuel pump relay, or fuel pump itself. On the 'not so easy' list, it could be an engine sensor, vacuum leak, or even an ECU problem. Worst of all it could be the dreaded ETM problem. First question really ought to be do you have any fault codes or warning lights? Is the Check Engine light coming on at all? Jack

Oct 15th, 2008, 17:25	#5
comedywizard comedywizard Last Online: Nov 12th, 2011 11:51 Join Date: Jul 2006 Location: Cardiff	Hi, thanks for the suggestions. I will keep an eye out for any warning lights and check everything is clean. I hope its not the ETM problem as I had it cleaned a year ago when I replaced the ABS module with a brand new one from Volvo (cost a small fortune!).

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