Hunting/rough running on tickover - Page 2

Bernard LPG · 31st October 2010, 19:19

Quote:

Originally Posted by chrissyboy

and the idle valve

I'm out.

stocktake · 31st October 2010, 19:20

My practical experience with air leaks on the inlet manifold on the KV6 is a tickover of around 2000 revs, not lumpy. ( often forget to make sure the seal is back on the VIS motor

)

Greeners · 31st October 2010, 19:26

Quote:

Originally Posted by Bernard LPG

I'm out.

Ah Bernard, were you ever really in though ?

Platemaker · 31st October 2010, 19:33

Quote:

Originally Posted by stocktake

My practical experience with air leaks on the inlet manifold on the KV6 is a tickover of around 2000 revs, not lumpy. ( often forget to make sure the seal is back on the VIS motor

)

I'd go along with that.

I would certainly be having a look at the basics such as the quality of the plugs etc. Tracking to ground on the the front bank HT leads is not unknown.

Sounds silly but run it up with the engine cover off in the dark, if there are any suspect leads then you will most certainly see them.

The quality and security of both front and rear bank coil pack earth points should be checked. (ring connector under a 10mm nut at the front and bolt on the back). Just don't run the car with them disconnected as ECU coil pack damage can result.

Hope that helps and forgive me if you have aready checked my suggestions.

Phil · 31st October 2010, 19:34

Is it a rhythemic hunting, like a pulse up and down, if so it sounds like a sticky IAC valve to me.

jn12 · 31st October 2010, 20:55

Agree with messenger on the front or rear coils and the earthing, Had this problem once and this caused a rough tick over.

John

malcolm the piano man · 1st November 2010, 11:41

This is air related. You can put your hand over the large air intake orrifice amd there is little or no feel of sucking. You can put your thumb over the small intake above it and it is sucking hard. The wrong way round I think?

stocktake · 1st November 2010, 17:26

Quote:

Originally Posted by malcolm the piano man

This is air related. You can put your hand over the large air intake orrifice amd there is little or no feel of sucking. You can put your thumb over the small intake above it and it is sucking hard. The wrong way round I think?

Nope, thats just how mine is.

chrissyboy · 1st November 2010, 18:04

Quote:

Originally Posted by Phil

Is it a rhythemic hunting, like a pulse up and down, if so it sounds like a sticky IAC valve to me.

aint that what i said before the other guy said he was out ????????????????

chrissyboy · 1st November 2010, 18:05

Quote:

Originally Posted by Bernard LPG

I'm out.

idle air control valve- iac

31st October 2010, 19:20	#12
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,596 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	My practical experience with air leaks on the inlet manifold on the KV6 is a tickover of around 2000 revs, not lumpy. ( often forget to make sure the seal is back on the VIS motor ) __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

31st October 2010, 19:34	#15
Phil This is my second home Rover 75 CDT Connoisseur SE Join Date: Nov 2006 Location: Wales Posts: 12,227 Thanks: 469 Thanked 523 Times in 241 Posts	Is it a rhythemic hunting, like a pulse up and down, if so it sounds like a sticky IAC valve to me. __________________

1st November 2010, 11:41	#17
malcolm the piano man Avid contributor 75 Tourer 2.5 Connoisseur SE Join Date: Sep 2009 Location: Nottinghamshire Posts: 209 Thanks: 7 Thanked 2 Times in 2 Posts	This is air related. You can put your hand over the large air intake orrifice amd there is little or no feel of sucking. You can put your thumb over the small intake above it and it is sucking hard. The wrong way round I think? __________________ Malcolm

31st October 2010, 20:55	#16
jn12 Gets stuck in MG ZT SE 180 V6 Sports Auto Join Date: Dec 2006 Location: Newcastle upon Tyne Posts: 938 Thanks: 74 Thanked 37 Times in 36 Posts	Agree with messenger on the front or rear coils and the earthing, Had this problem once and this caused a rough tick over. John