throttle High revving

janker · 9th March 2020, 16:34

Hi Everybody
My MG 190 petrol 2002 has a problem with high revving when cold ,Ive removed the throttle body and cleaned and replaced the gasket set, but sometimes when its cold pulling up to a junction its upto 2000 rpm then drops slowly,i cant find any air leaks,ive read something about a pedal sensor ,would my car have this ?? or any other ideas please.Its perfect when the engine is warmed up though ??
thanks julian

Lord of Hog · 10th March 2020, 10:39

Sounds like either a split breather or a knackered idle valve. But if you've already looked at those then I'm out of ideas.

planenut · 10th March 2020, 12:24

Have you examined the idle valve, not the throttle?

stocktake · 10th March 2020, 15:18

Have you replaced this kit on the throttle body?
https://rimmerbros.com/Item--i-MKG100260L
This controls the air drawn in when cold on the KV6 and when worn is known to cause the problem you describe

janker · 10th March 2020, 20:56

Quote:

Originally Posted by stocktake

Have you replaced this kit on the throttle body?
https://rimmerbros.com/Item--i-MKG100260L
This controls the air drawn in when cold on the KV6 and when worn is known to cause the problem you describe

Hi Yes that is the kit ive used and cleaned everything up too.

janker · 10th March 2020, 20:58

Quote:

Originally Posted by planenut

Have you examined the idle valve, not the throttle?

Yes i removed it cleaned it but didnt look anything obvious wrong but maybe i need try a replacement.

trikey · 10th March 2020, 21:07

Have a look at the rubber hose that connects the air filter to the throttle body, if this has any leaks or not sealing properly then your revs will rise.

janker · 10th March 2020, 21:16

Quote:

Originally Posted by trikey

Have a look at the rubber hose that connects the air filter to the throttle body, if this has any leaks or not sealing properly then your revs will rise.

Hi Trikey my car has an after market air filter fitted so would it still have that hose somewhere ?

trikey · 10th March 2020, 21:18

Quote:

Originally Posted by janker

Hi Trikey my car has an after market air filter fitted so would it still have that hose somewhere ?

Yes, its the smaller hose that pushes onto the throttle body.

janker · 10th March 2020, 21:26

Quote:

Originally Posted by trikey

Yes, its the smaller hose that pushes onto the throttle body.

Is it the more solid plastic hose that inserts into the throttle body as it seems to have a collar to hold it in and it aint very good if its that one.

9th March 2020, 16:34	#1
janker Loves to post Rover 75 Saloon & MGZT 190 Join Date: Jun 2012 Location: Leek Posts: 390 Thanks: 333 Thanked 57 Times in 39 Posts	throttle High revving Hi Everybody My MG 190 petrol 2002 has a problem with high revving when cold ,Ive removed the throttle body and cleaned and replaced the gasket set, but sometimes when its cold pulling up to a junction its upto 2000 rpm then drops slowly,i cant find any air leaks,ive read something about a pedal sensor ,would my car have this ?? or any other ideas please.Its perfect when the engine is warmed up though ?? thanks julian __________________ This vehicle was the 53,401st 75 to run off the production line, out of 112,381 This vehicle was the 2,551st 75 CDT Club to be made out of 3,403 This vehicle was the 5,192nd 75 in White Gold Metallic (code: GMN) to be made out of 12,251 White Gold Metallic 75s My New Addition MGZT 190 Trophy Blue 2001 Petrol.

10th March 2020, 10:39	#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	Sounds like either a split breather or a knackered idle valve. But if you've already looked at those then I'm out of ideas. __________________ Conformity is not morality. Consensus is not truth.

10th March 2020, 15:18	#4
stocktake Vis Whiz Rover 75 2.5 auto Saloon Join Date: Jun 2007 Location: LEEDS Posts: 20,590 Thanks: 2,057 Thanked 3,056 Times in 1,621 Posts	Have you replaced this kit on the throttle body? https://rimmerbros.com/Item--i-MKG100260L This controls the air drawn in when cold on the KV6 and when worn is known to cause the problem you describe __________________ Dave... Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident

10th March 2020, 21:07	#7
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,769 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Have a look at the rubber hose that connects the air filter to the throttle body, if this has any leaks or not sealing properly then your revs will rise. __________________ Lest we forget..

10th March 2020, 12:24	#3
planenut Regional Secretary Rover 1.8T Tourer Join Date: May 2007 Location: Heathrow Posts: 6,955 Thanks: 1,551 Thanked 2,036 Times in 1,264 Posts	Have you examined the idle valve, not the throttle?