KV6 struggling to start.....

Steve Powell · 20th November 2011, 19:27

Evening all
My KV6 struggles to start when cold.......10-20 seconds until she fires up....

Ive been on the T4 but no real answers.............Ive had a few people say it may be the Crankshaft Sensor....

Would anyone have one I could buy for a reasonable price

That way I could eliminate or cure this sensor

Cheers

MangoMan · 20th November 2011, 19:58

I very much doubt it's your Crank Sensor. I would say it's something to do with your Cold Start Enrichment Switch, or whatever it is called now, but basically the Auto-Choke. And also check you battery terminals for good/clean/tight connection.

Steve Powell · 20th November 2011, 20:05

Wonder what that's called on these fine machines !! :-)

The battery is relatively new, in good order and terminals all good....

MisterTomez · 20th November 2011, 20:22

It sounds to me more like a cam sensor issue rather than the crank. When they fail the engine is difficult to start when cold as you describe because the ECU has to effectively guess when to give the spark by trying to determine what position the engine is in.

Steve Powell · 20th November 2011, 20:26

Ive recently replaced the cam shaft sensor as she was struggling to start when warm.......

I ws sat here just thinking Ill replace the camshaft sensor with my old one tomorrow and see if cold starting is any better !

MangoMan · 20th November 2011, 20:31

It won't be the Cam Sensor either. If it was that it wouldn't start hot or cold. It's more than likely the Choke Thermostat making the ECU think the engine is warm thereby not activating the 'Auto-Choke'.

Steve Powell · 20th November 2011, 20:37

Where would I find the Choke thermostat ? Sorry if im sounding thick

Can you test it ?

chrissyboy · 20th November 2011, 20:54

i would say its the crank sensor .

MangoMan · 20th November 2011, 22:31

Quote:

Originally Posted by GadgetBoy

There is no such thing. In cold temperatures the ECU simply fires more fuel through the injectors.

My KV6 was like yours for 3 yrs. Wouldn't start for a few seconds and then off it went. I considered it normal.

Yeah, well, how else would the ECU know it's cold unless there is a thermostat, or something simular telling it it's cold? Which usually taken from the water temperature, air intake temperature or the OTD?

So don't say there is "no such thing".....

Canonite · 21st November 2011, 07:32

My recent starting problems has been down to a cam sensor. But as has been said, it only failed to start when warm. When cold, fired up straight away every time.
I thought if it was a faulty crank sensor it wouldn't start at all.

20th November 2011, 19:27	#1
Steve Powell Avid contributor Rover 75 saloon Join Date: Aug 2009 Location: Tamworth Posts: 205 Thanks: 2 Thanked 0 Times in 0 Posts	KV6 struggling to start..... Evening all My KV6 struggles to start when cold.......10-20 seconds until she fires up.... Ive been on the T4 but no real answers.............Ive had a few people say it may be the Crankshaft Sensor.... Would anyone have one I could buy for a reasonable price That way I could eliminate or cure this sensor Cheers

20th November 2011, 19:58	#2
MangoMan This is my second home Looking.... Join Date: Oct 2010 Location: England Posts: 10,911 Thanks: 862 Thanked 1,111 Times in 868 Posts	I very much doubt it's your Crank Sensor. I would say it's something to do with your Cold Start Enrichment Switch, or whatever it is called now, but basically the Auto-Choke. And also check you battery terminals for good/clean/tight connection. __________________ *Regards, Bill - (MangoMan).* (Member 00854) http://i1110.photobucket.com/albums/...d.jpg~original

20th November 2011, 20:22	#4
MisterTomez Gets stuck in '00 BMW 535i Auto M-Sport, '99 Rover 75 2.5 V6 Connoisseur SE Auto Join Date: Jan 2010 Location: Midlands Posts: 733 Thanks: 0 Thanked 7 Times in 2 Posts	It sounds to me more like a cam sensor issue rather than the crank. When they fail the engine is difficult to start when cold as you describe because the ECU has to effectively guess when to give the spark by trying to determine what position the engine is in. __________________ ` [SIGPIC][/SIGPIC] "Trimmed like a first class cabin on the Titanic...before it sank." ---------- "The LPG'd, civilized psychopath."

20th November 2011, 20:31	#6
MangoMan This is my second home Looking.... Join Date: Oct 2010 Location: England Posts: 10,911 Thanks: 862 Thanked 1,111 Times in 868 Posts	It won't be the Cam Sensor either. If it was that it wouldn't start hot or cold. It's more than likely the Choke Thermostat making the ECU think the engine is warm thereby not activating the 'Auto-Choke'. __________________ *Regards, Bill - (MangoMan).* (Member 00854) http://i1110.photobucket.com/albums/...d.jpg~original

20th November 2011, 20:54	#8
chrissyboy This is my second home lovely little ford focus. Join Date: Jul 2009 Location: East Dulwich Posts: 7,877 Thanks: 2 Thanked 82 Times in 68 Posts	i would say its the crank sensor . __________________ [ I'm really confused. -I keep dreaming I'm an insomniac

20th November 2011, 20:05	#3
Steve Powell Avid contributor Rover 75 saloon Join Date: Aug 2009 Location: Tamworth Posts: 205 Thanks: 2 Thanked 0 Times in 0 Posts	Wonder what that's called on these fine machines !! :-) The battery is relatively new, in good order and terminals all good....

20th November 2011, 20:26	#5
Steve Powell Avid contributor Rover 75 saloon Join Date: Aug 2009 Location: Tamworth Posts: 205 Thanks: 2 Thanked 0 Times in 0 Posts	Ive recently replaced the cam shaft sensor as she was struggling to start when warm....... I ws sat here just thinking Ill replace the camshaft sensor with my old one tomorrow and see if cold starting is any better !

20th November 2011, 20:37	#7
Steve Powell Avid contributor Rover 75 saloon Join Date: Aug 2009 Location: Tamworth Posts: 205 Thanks: 2 Thanked 0 Times in 0 Posts	Where would I find the Choke thermostat ? Sorry if im sounding thick Can you test it ?

21st November 2011, 07:32	#10
Canonite This is my second home BMW 330d Tourer, MG ZT 180 SE XPG, VW Polo 6R 1.2 TDI Bluemotion Join Date: Jul 2011 Location: York Posts: 6,030 Thanks: 363 Thanked 574 Times in 319 Posts	My recent starting problems has been down to a cam sensor. But as has been said, it only failed to start when warm. When cold, fired up straight away every time. I thought if it was a faulty crank sensor it wouldn't start at all.