V70: - Missing, stalling - getting worse

LeeTurner · Jul 25th, 2009, 11:15

Only had my 97 V70 a few weeks. A couple of days after buying it the MIL light came on. Car generally ran fine with a slight misfire happening only once but took it down to a good local independent. Problem was diagnosed as an air leak and the pipe was replaced. Driving home and the light came on again and the car started missing quite badly and ,upon pulling up to a stop, started to stall. Got hold of an OBDII interface and software - the code was showing P0335 - Crankshaft Sensor. Now this was strange as I've had a crankshaft sensor fail on my Jag and the car stopped completely until it cooled down. I took the car back in yesterday and the MIL was reset. I was told that the diagnostics were showing the P0335 error and he was also surprised as this tend to be a terminal failure, in that the car just stops. Was told to drive the car and if the MIL light came on again to bring it straight back. Needless to say it came back on and the symptoms were way worse than before. A major missing and stalling quite regularly and I barely made it home. Plugged in the reader and it's the same code.
Has anyone else experienced a crank sensor failure in this way? I'm wondering if the difference between the Volvo and the Jag is that the latter uses individual coil packs and if the sensor fails then there's nothing getting through for spark whilst the Volvo still has a dizzy.
Car is a 97 V70, 20V.

glock19 · Jul 25th, 2009, 18:31

Faulty crank sensor can cause hard startups - do you have these ?

LeeTurner · Jul 26th, 2009, 19:43

Nope, that's what is strange. On my other car it wouldn't restart for quite a while - usually several hours. On the V70 if starts straight away even after a stall.

thealchemyst · Jul 27th, 2009, 02:34

i had a faulty crank sensor on my 850 t5 ran fine and only really showed a problem on harsh aceleration, error code showed up on the self diagnosis test, replaced it with a brand new one and it was fixed never had the problem since! so yes you can have a faulty/failing sensor and still have the engine run.

cheers martyn

LeeTurner · Jul 27th, 2009, 07:03

Thanks for the answers. I'll book it in today as it wasn't a pleasant drive into work this morning - the car is missing and stalling at idle. For the first time it struggled a little to start after stalling and after being stuck on a motorway last time I had a crank sensor failure it's not something I want to repeat.

RSF · Jul 27th, 2009, 11:27

It might need replacing or just tightning up.
Look at your gear box and it is in the centre at the top next to a pipe and behind a big fat pipe,has 2 bolts and they bolt to youe head,the bottom half of the sits inside the gear box.Might just need tightning up,if not it is easy enough to replace.
When replacing it,be patient as it has a dowl the sits in the head,you can replace it with out removing the gear box,is basicly what I'm trying to say.
Have you removed the sensor plug at all?
Reason I ask is,there is 2 plugs exactly the same and you may have them back to front.

LeeTurner · Jul 27th, 2009, 14:43

Update - the sensor was replaced but the MIL light is back on. It appears to be a wiring issue.

LeeTurner · Jul 27th, 2009, 18:29

Another update - sensor replaced but the fault is still not going away. The ECU was removed and cleaned and the MIL light reset. Within 1 mile it started missing again and the MIL light came on. Serious missing under load and it'll have to go back on Friday as I'm in London for the next 3 days.
Plugged in the laptop and it's still giving a P0335 crankshaft sensor circuit malfunction error.

Getting a bit stumped now - new vac pipe, new sensor. Is there anything else that can cause this error? I read on one forum that possible problems with the cambelt can cause an error as there is a discrepancy between the cam and crank sensors but this seems like more of a problem with the circuit itself. The mechanic that's dealing with it has been very good, only charging me for the sensor but I get the feeling that he's dreading seeing the car back in his yard. He's a very well regarded Volvo Independent.

thealchemyst · Jul 27th, 2009, 20:10

unlikely but worth a quick look whilst trying to diagnose faults check for corrosion of the connectors in the plug on the loom! if they are slightly or very corroded it might cause you to be loosing the signal, another possibility is that you have a fractured wire in the loom (in the signal circuit) this can be a real pain in the ass to diagnose and sort out so i'm hoping that it isnt that!
if your volvo independent cant find the fault it would probably be worth getting a proper vehicle electrician to fault find it!
hope you find the problem soon.

LeeTurner · Jul 28th, 2009, 07:03

It certainly appears to be heat related - I had an early start this morning and the for the first 20 minutes of the journey the car ran perfectly as it does every time from cold. As the engine gets hotter the missing starts. Does heat affect resistance? In terms of contacts I would have thought that with metal expanding due to heat that the contact would have got better. I'm on my way to London so will pick up some decent contact cleaner and give everything a blast with that.
Forgot to add - the temp gauge stays at 3 o'clock.

Jul 25th, 2009, 11:15	#1
LeeTurner New Member Last Online: May 7th, 2010 10:03 Join Date: Jul 2009 Location: Lancashire	Missing, stalling - getting worse Only had my 97 V70 a few weeks. A couple of days after buying it the MIL light came on. Car generally ran fine with a slight misfire happening only once but took it down to a good local independent. Problem was diagnosed as an air leak and the pipe was replaced. Driving home and the light came on again and the car started missing quite badly and ,upon pulling up to a stop, started to stall. Got hold of an OBDII interface and software - the code was showing P0335 - Crankshaft Sensor. Now this was strange as I've had a crankshaft sensor fail on my Jag and the car stopped completely until it cooled down. I took the car back in yesterday and the MIL was reset. I was told that the diagnostics were showing the P0335 error and he was also surprised as this tend to be a terminal failure, in that the car just stops. Was told to drive the car and if the MIL light came on again to bring it straight back. Needless to say it came back on and the symptoms were way worse than before. A major missing and stalling quite regularly and I barely made it home. Plugged in the reader and it's the same code. Has anyone else experienced a crank sensor failure in this way? I'm wondering if the difference between the Volvo and the Jag is that the latter uses individual coil packs and if the sensor fails then there's nothing getting through for spark whilst the Volvo still has a dizzy. Car is a 97 V70, 20V.

Jul 27th, 2009, 11:27	#6
RSF Master Member Last Online: May 15th, 2011 03:44 Join Date: Apr 2009 Location: WALSALL/STECHFORD/BIRMINGHAM	It might need replacing or just tightning up. Look at your gear box and it is in the centre at the top next to a pipe and behind a big fat pipe,has 2 bolts and they bolt to youe head,the bottom half of the sits inside the gear box.Might just need tightning up,if not it is easy enough to replace. When replacing it,be patient as it has a dowl the sits in the head,you can replace it with out removing the gear box,is basicly what I'm trying to say. Have you removed the sensor plug at all? Reason I ask is,there is 2 plugs exactly the same and you may have them back to front. __________________ BLACK MANUAL VOLVO 850 T5 ESTATE (CRUSHED). T5 WANTED,CHEAP PROJECT WITH MOT

Jul 27th, 2009, 18:29	#8
LeeTurner New Member Last Online: May 7th, 2010 10:03 Join Date: Jul 2009 Location: Lancashire	Another update - sensor replaced but the fault is still not going away. The ECU was removed and cleaned and the MIL light reset. Within 1 mile it started missing again and the MIL light came on. Serious missing under load and it'll have to go back on Friday as I'm in London for the next 3 days. Plugged in the laptop and it's still giving a P0335 crankshaft sensor circuit malfunction error. Getting a bit stumped now - new vac pipe, new sensor. Is there anything else that can cause this error? I read on one forum that possible problems with the cambelt can cause an error as there is a discrepancy between the cam and crank sensors but this seems like more of a problem with the circuit itself. The mechanic that's dealing with it has been very good, only charging me for the sensor but I get the feeling that he's dreading seeing the car back in his yard. He's a very well regarded Volvo Independent. Last edited by LeeTurner; Jul 27th, 2009 at 18:54.

Jul 25th, 2009, 18:31	#2
glock19 Member Last Online: Jul 10th, 2021 08:34 Join Date: Oct 2008 Location: Georgetown	Faulty crank sensor can cause hard startups - do you have these ?

Jul 26th, 2009, 19:43	#3
LeeTurner New Member Last Online: May 7th, 2010 10:03 Join Date: Jul 2009 Location: Lancashire	Nope, that's what is strange. On my other car it wouldn't restart for quite a while - usually several hours. On the V70 if starts straight away even after a stall.

Jul 27th, 2009, 02:34	#4
thealchemyst Master Member Last Online: Aug 22nd, 2018 20:57 Join Date: Apr 2009 Location: Coalville/Leicestershire	i had a faulty crank sensor on my 850 t5 ran fine and only really showed a problem on harsh aceleration, error code showed up on the self diagnosis test, replaced it with a brand new one and it was fixed never had the problem since! so yes you can have a faulty/failing sensor and still have the engine run. cheers martyn

Jul 27th, 2009, 07:03	#5
LeeTurner New Member Last Online: May 7th, 2010 10:03 Join Date: Jul 2009 Location: Lancashire	Thanks for the answers. I'll book it in today as it wasn't a pleasant drive into work this morning - the car is missing and stalling at idle. For the first time it struggled a little to start after stalling and after being stuck on a motorway last time I had a crank sensor failure it's not something I want to repeat.

Jul 27th, 2009, 14:43	#7
LeeTurner New Member Last Online: May 7th, 2010 10:03 Join Date: Jul 2009 Location: Lancashire	Update - the sensor was replaced but the MIL light is back on. It appears to be a wiring issue.

Jul 27th, 2009, 20:10	#9
thealchemyst Master Member Last Online: Aug 22nd, 2018 20:57 Join Date: Apr 2009 Location: Coalville/Leicestershire	unlikely but worth a quick look whilst trying to diagnose faults check for corrosion of the connectors in the plug on the loom! if they are slightly or very corroded it might cause you to be loosing the signal, another possibility is that you have a fractured wire in the loom (in the signal circuit) this can be a real pain in the ass to diagnose and sort out so i'm hoping that it isnt that! if your volvo independent cant find the fault it would probably be worth getting a proper vehicle electrician to fault find it! hope you find the problem soon.

Jul 28th, 2009, 07:03	#10
LeeTurner New Member Last Online: May 7th, 2010 10:03 Join Date: Jul 2009 Location: Lancashire	It certainly appears to be heat related - I had an early start this morning and the for the first 20 minutes of the journey the car ran perfectly as it does every time from cold. As the engine gets hotter the missing starts. Does heat affect resistance? In terms of contacts I would have thought that with metal expanding due to heat that the contact would have got better. I'm on my way to London so will pick up some decent contact cleaner and give everything a blast with that. Forgot to add - the temp gauge stays at 3 o'clock.

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