o2 Sensor Heater - Page 2

zxgooner · 16th January 2010, 14:30

Thanks for all the response's, I'll try them out 1 by 1 and hopefully get it sorted.

As of 3pm it still doesn't want to start and justs keeps turning over.

Can anyone point me in the direction of 'how to guides' for the cam sensor and fuel filter.

Cheers
Mark

edit: found the cam sensor one

zxgooner · 17th January 2010, 09:31

Quick update

Tried again to start and it fired into life but extremley lumpy, the temp gauage went straight to red and the fan immediatately came on full blast. All coolants are at recommended levels so has anyone have any ideas what this may mean?

Mark

Greeners · 17th January 2010, 09:35

Fan running straight away at full speed is normally coolant sensor / wiring fault. The ECU does this to protect the engine from overheating.

Departed · 17th January 2010, 09:47

If the coolant sensor or circuit is faulty, then that could cause your starting problem.

If the ECU has no idea how warm the engine is it will take a default temperature, and therefore if the engine is actually cold, not give the enrichment needed for a cold start. If it does fire it would run lumpy until it warmed up then be better.

However I would expect a fault code.

nopainnogain · 17th January 2010, 10:45

i would expect it to be lumpy for a time,all that failing to start has pumped alot of fuel into the bores and fouled the plugs,the fan running and temp guage problem needs investigation tho,as said maybe duff sensor or wiring and the fan defaulting to high speed.

zxgooner · 21st January 2010, 11:13

Another Update

Had another RAC man come today who towed the car to the garage. But before he did this he put his diagnostic compter on and it came back with 4 codes.

O2 Sensor x2
Variable Butterfly always open
Cooling Fan Resistor (High)

He cleared these out and done another check and only the cooling fan one came back, but the engine temp sensor was 132C! So me thinks that may be the problem. He also said it could be the ECU because we haven't used over the cold period and the snow may have got in there, I have cleaned the pleniums.

We will see what the garage says, hopefully not to expensive.

Mark

zxgooner · 5th February 2010, 14:39

Right

Got the car back today and it was the coolant sensor that was stopping it from starting, he managed to get the thing out and in without taking of the inlet manifold by grinding down and bending a spanner to fit :lol: so saving lots of cash:lol:

Thanks for your help identifying the problem guys as initially he said it maybe the ecu but after your words of wisdom I persuaded him to look at the sensor first, thank you all

Mark

16th January 2010, 14:30	#11
zxgooner Newbie Rover 75 V6 Club SE Join Date: Sep 2008 Location: Norfolk Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks for all the response's, I'll try them out 1 by 1 and hopefully get it sorted. As of 3pm it still doesn't want to start and justs keeps turning over. Can anyone point me in the direction of 'how to guides' for the cam sensor and fuel filter. Cheers Mark edit: found the cam sensor one Last edited by zxgooner; 16th January 2010 at 14:42..

17th January 2010, 09:35	#13
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	Fan running straight away at full speed is normally coolant sensor / wiring fault. The ECU does this to protect the engine from overheating. __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

17th January 2010, 09:31	#12
zxgooner Newbie Rover 75 V6 Club SE Join Date: Sep 2008 Location: Norfolk Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	Quick update Tried again to start and it fired into life but extremley lumpy, the temp gauage went straight to red and the fan immediatately came on full blast. All coolants are at recommended levels so has anyone have any ideas what this may mean? Mark

17th January 2010, 09:47	#14
Departed Retired -- Join Date: Jan 2007 Location: -- Posts: 3,785 Thanks: 0 Thanked 4 Times in 4 Posts	If the coolant sensor or circuit is faulty, then that could cause your starting problem. If the ECU has no idea how warm the engine is it will take a default temperature, and therefore if the engine is actually cold, not give the enrichment needed for a cold start. If it does fire it would run lumpy until it warmed up then be better. However I would expect a fault code.

17th January 2010, 10:45	#15
nopainnogain Avid contributor rover 75 2.0 v6-low 9 second pro street 100e Join Date: Jul 2009 Location: warwickshire Posts: 144 Thanks: 0 Thanked 0 Times in 0 Posts	i would expect it to be lumpy for a time,all that failing to start has pumped alot of fuel into the bores and fouled the plugs,the fan running and temp guage problem needs investigation tho,as said maybe duff sensor or wiring and the fan defaulting to high speed.

21st January 2010, 11:13	#16
zxgooner Newbie Rover 75 V6 Club SE Join Date: Sep 2008 Location: Norfolk Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	Another Update Had another RAC man come today who towed the car to the garage. But before he did this he put his diagnostic compter on and it came back with 4 codes. O2 Sensor x2 Variable Butterfly always open Cooling Fan Resistor (High) He cleared these out and done another check and only the cooling fan one came back, but the engine temp sensor was 132C! So me thinks that may be the problem. He also said it could be the ECU because we haven't used over the cold period and the snow may have got in there, I have cleaned the pleniums. We will see what the garage says, hopefully not to expensive. Mark

5th February 2010, 14:39	#17
zxgooner Newbie Rover 75 V6 Club SE Join Date: Sep 2008 Location: Norfolk Posts: 9 Thanks: 0 Thanked 0 Times in 0 Posts	Right Got the car back today and it was the coolant sensor that was stopping it from starting, he managed to get the thing out and in without taking of the inlet manifold by grinding down and bending a spanner to fit :lol: so saving lots of cash:lol: Thanks for your help identifying the problem guys as initially he said it maybe the ecu but after your words of wisdom I persuaded him to look at the sensor first, thank you all Mark