Kv6 cold start splutter

genpk · 26th April 2018, 06:22

Have an issue with one of my 75s.
On cold startup the engine fires up but after a second of running at choke level revs it drops to a splutter , almost stalling then suddenly pulls back to normal higher choke revs.
The car is a little slugish for the first few minutes of driving then come good.
The car will tgen startup and run perfectly the rest of the day.
Been doing this for a while now but i think it getting slightly worse.
Sonthing to do with cold starts !

Lord of Hog · 26th April 2018, 07:23

If you've got an auto box it might be the stepper motor. I had something similar where it would start fine, rev fine in reverse as I turned it round and then as I shifted from reverse to drive the revs would briefly drop away for the time it was in neutral. Changed the stepper and it was fine again.

genpk · 26th April 2018, 10:48

Its kind of strange, only happens when stone cold.
Kicks over perfectly and the revs for the first second are right where they should be when cold then the revs just drop and and rough unless i touch the accelorator would possibly cut out.
Give it a quick stab of the pedal and revs returns to the correct choke revs!!
Im wondering if this started after i removed the intake manifold a while back.

genpk · 26th April 2018, 23:49

Did a bit of a search, seems alot of kv6 owners suffer with similar issues.
One landrover owner reckons may be either o2 sensors or knock sensors causing the startup splutter.

stocktake · 27th April 2018, 15:21

there is a cold start service kit you can get from rimmers for the KV6, not a fortune. back on a mo with a part number, I think its in my my shed.....

stocktake · 27th April 2018, 15:23

Mkg 100260L

No idea why it is called fuel injector O ring kit. it is the service kit for the assy on top the of throttle body allows extra air into the inlet manifold to enable fast idle when cold.

genpk · 28th April 2018, 02:24

Got out to the car today,whilst stone cold took the map sensor out, cleaned that,took airbox off and fired some maf sensor cleaner up the throttle body, also into the idle control sensor housing.
Was a bit of oil in there and the rubber airbox pipe.
Fired the car up and no splutter on startup.
Ill wait and see how it goes next few startups but looks positive thus far.
May need to put the oil catch tank back in but it never seemed to collect anything but a bit of oily water in it !!!

genpk · 29th April 2018, 08:28

Seems the cleaning of the map sensor and throttle body has done the trick.
Again, start up today perfectly, no choke hesitation or revs drop off, straight to choke revs and pulled away smoothly with power.

beavis · 15th February 2021, 04:33

Quote:

Originally Posted by genpk

Seems the cleaning of the map sensor and throttle body has done the trick.
Again, start up today perfectly, no choke hesitation or revs drop off, straight to choke revs and pulled away smoothly with power.

My throttle body is clean and I’m getting exactly the same problem at temps -10 Celsius. So it must be the map sensor the only option left. What should I do exactly? Where is located? Thanks!

SD1too · 15th February 2021, 07:58

Quote:

Originally Posted by beavis

Where is located? Thanks!

It's item 9 here.
It's called the IAT/MAP sensor (intake air temperature/manifold absolute pressure).

Simon

26th April 2018, 06:22	#1
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,662 Thanks: 3 Thanked 461 Times in 299 Posts	Kv6 cold start splutter Have an issue with one of my 75s. On cold startup the engine fires up but after a second of running at choke level revs it drops to a splutter , almost stalling then suddenly pulls back to normal higher choke revs. The car is a little slugish for the first few minutes of driving then come good. The car will tgen startup and run perfectly the rest of the day. Been doing this for a while now but i think it getting slightly worse. Sonthing to do with cold starts !

26th April 2018, 07:23	#2
Lord of Hog Gets stuck in Rover 75 2.5 V6 in Wedgwood Blue Join Date: Dec 2015 Location: Felbridge, East Grinstead Posts: 982 Thanks: 250 Thanked 294 Times in 206 Posts	If you've got an auto box it might be the stepper motor. I had something similar where it would start fine, rev fine in reverse as I turned it round and then as I shifted from reverse to drive the revs would briefly drop away for the time it was in neutral. Changed the stepper and it was fine again. __________________ Conformity is not morality. Consensus is not truth.

27th April 2018, 15:21	#5
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,586 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	there is a cold start service kit you can get from rimmers for the KV6, not a fortune. back on a mo with a part number, I think its in my my shed..... __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

27th April 2018, 15:23	#6
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,586 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	Mkg 100260L No idea why it is called fuel injector O ring kit. it is the service kit for the assy on top the of throttle body allows extra air into the inlet manifold to enable fast idle when cold. __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident Last edited by stocktake; 29th April 2018 at 08:30..

26th April 2018, 10:48	#3
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,662 Thanks: 3 Thanked 461 Times in 299 Posts	Its kind of strange, only happens when stone cold. Kicks over perfectly and the revs for the first second are right where they should be when cold then the revs just drop and and rough unless i touch the accelorator would possibly cut out. Give it a quick stab of the pedal and revs returns to the correct choke revs!! Im wondering if this started after i removed the intake manifold a while back.

26th April 2018, 23:49	#4
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,662 Thanks: 3 Thanked 461 Times in 299 Posts	Did a bit of a search, seems alot of kv6 owners suffer with similar issues. One landrover owner reckons may be either o2 sensors or knock sensors causing the startup splutter.

28th April 2018, 02:24	#7
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,662 Thanks: 3 Thanked 461 Times in 299 Posts	Got out to the car today,whilst stone cold took the map sensor out, cleaned that,took airbox off and fired some maf sensor cleaner up the throttle body, also into the idle control sensor housing. Was a bit of oil in there and the rubber airbox pipe. Fired the car up and no splutter on startup. Ill wait and see how it goes next few startups but looks positive thus far. May need to put the oil catch tank back in but it never seemed to collect anything but a bit of oily water in it !!!

29th April 2018, 08:28	#8
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,662 Thanks: 3 Thanked 461 Times in 299 Posts	Seems the cleaning of the map sensor and throttle body has done the trick. Again, start up today perfectly, no choke hesitation or revs drop off, straight to choke revs and pulled away smoothly with power.