ZT 190 - Random tremor at idle

TBennet · 22nd March 2018, 11:31

Hi there,

Just wondering if anyone has come accross a similar issue to this before.

When idling, every few seconds you can feel a small tremor pass through the car. It's not violent or especially intrusive, but certainly noticeable.

The tremors are not consistent. One every 5 seconds, or sometimes nothing for maybe 10 or 15 seconds. Sometimes one may immediately follow another.

Also, the rev counter needle moves very slightly, a milimeter or two upward and back down.

The car is ZT 190, 65,000 miles. Recently serviced, including new spark plugs and VIS motors recently changed. The issue was present before all of this, so I'm certain I haven't caused it by anything I've done.

The car is certainly not down on performance when being worked hard, but I do find it bogs down very easily when pulling away if you don't quite apply enough throttle, and when changing from 1st to 2nd, but maybe this is just a normal characteristic of these cars...

My mechanic witnessed the issue, but couldn't find anything wrong and suggested I try injector cleaner. Haven't done that yet.

Any suggestions from the collective wisdom of the forum?

Many thanks.

trikey · 22nd March 2018, 11:47

Buy a throttle body rebuild kit from rimmers, a ten min job to fit, pretty sure this will cure the issue.

TBennet · 22nd March 2018, 12:00

Ah right, ok. Thanks. What are you thinking is wrong with the old one to cause this problem?

Ravinder · 22nd March 2018, 12:51

If the revs drop quite low, this will cause a little shudder which you willl feel like it’s about to stall. So, that could be the problem. Is there not a nipple on the throttle body that can be adjusted? Or, does the V6 have a throttle reset procedure ?

BigBen · 22nd March 2018, 13:11

Quote:

Originally Posted by trikey

Buy a throttle body rebuild kit from rimmers, a ten min job to fit, pretty sure this will cure the issue.

Maurice did this, one rebuild kit later and he hasn't done it in 5 years.

Also make sure the throttle cable is properly adjusted, they can easily become too loose as they stretch over time - leading to you not getting a proper full throttle response.

TBennet · 22nd March 2018, 13:26

Apologies for being dense, but I can't seem to find anything called a "throttle body rebuild kit". What does the kit comprise of?

KLM · 22nd March 2018, 13:38

This terminology was known as "hunting" in the old days.

https://www.quora.com/What-is-engine-hunting

Kev.

BigBen · 22nd March 2018, 14:35

Quote:

Originally Posted by TBennet

Apologies for being dense, but I can't seem to find anything called a "throttle body rebuild kit". What does the kit comprise of?

It's called the "Fast Idle Assemby Overhaul Kit" Land Rover part number MKG100260L

It's basically a gasket, o-ring, plastic valve contol piece and 4 new bolts; cost is normally around a tenner.

TBennet · 23rd March 2018, 07:58

Many thanks, I will give this a try.

trikey · 23rd March 2018, 09:19

The little plastic ‘T’ piece distorts with age....

22nd March 2018, 11:31	#1
TBennet Regular poster MG ZT-T 190 Join Date: Dec 2017 Location: Manchester Posts: 60 Thanks: 3 Thanked 9 Times in 7 Posts	ZT 190 - Random tremor at idle Hi there, Just wondering if anyone has come accross a similar issue to this before. When idling, every few seconds you can feel a small tremor pass through the car. It's not violent or especially intrusive, but certainly noticeable. The tremors are not consistent. One every 5 seconds, or sometimes nothing for maybe 10 or 15 seconds. Sometimes one may immediately follow another. Also, the rev counter needle moves very slightly, a milimeter or two upward and back down. The car is ZT 190, 65,000 miles. Recently serviced, including new spark plugs and VIS motors recently changed. The issue was present before all of this, so I'm certain I haven't caused it by anything I've done. The car is certainly not down on performance when being worked hard, but I do find it bogs down very easily when pulling away if you don't quite apply enough throttle, and when changing from 1st to 2nd, but maybe this is just a normal characteristic of these cars... My mechanic witnessed the issue, but couldn't find anything wrong and suggested I try injector cleaner. Haven't done that yet. Any suggestions from the collective wisdom of the forum? Many thanks.

22nd March 2018, 11:47	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Buy a throttle body rebuild kit from rimmers, a ten min job to fit, pretty sure this will cure the issue. __________________ Lest we forget..

22nd March 2018, 12:51	#4
Ravinder This is my second home Rover 75 saloon x2, Rover 75 Tourer x2, Rover 220 Coupe Turbo Join Date: Aug 2010 Location: Kirkcaldy, Fife Posts: 9,036 Thanks: 2,278 Thanked 2,852 Times in 1,718 Posts	If the revs drop quite low, this will cause a little shudder which you willl feel like it’s about to stall. So, that could be the problem. Is there not a nipple on the throttle body that can be adjusted? Or, does the V6 have a throttle reset procedure ? __________________ Wanted - Indian bride. Cash waiting. (All sorted - bargain) First name and forum name: Ravinder Rover 75 2.0 CDT Connoisseur SE 116 (160 remap) Royal Blue (JFM) This vehicle was the 50,481st 75 to run off the production line, out of 112,381 This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775 This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s

23rd March 2018, 09:19	#10
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,765 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	The little plastic ‘T’ piece distorts with age.... __________________ Lest we forget..

22nd March 2018, 12:00	#3
TBennet Regular poster MG ZT-T 190 Join Date: Dec 2017 Location: Manchester Posts: 60 Thanks: 3 Thanked 9 Times in 7 Posts	Ah right, ok. Thanks. What are you thinking is wrong with the old one to cause this problem?

22nd March 2018, 13:26	#6
TBennet Regular poster MG ZT-T 190 Join Date: Dec 2017 Location: Manchester Posts: 60 Thanks: 3 Thanked 9 Times in 7 Posts	Apologies for being dense, but I can't seem to find anything called a "throttle body rebuild kit". What does the kit comprise of?

22nd March 2018, 13:38	#7
KLM Posted a thing or two Rover 75 Club CDT Join Date: Oct 2008 Location: North West Posts: 1,289 Thanks: 691 Thanked 394 Times in 240 Posts	This terminology was known as "hunting" in the old days. https://www.quora.com/What-is-engine-hunting Kev.

23rd March 2018, 07:58	#9
TBennet Regular poster MG ZT-T 190 Join Date: Dec 2017 Location: Manchester Posts: 60 Thanks: 3 Thanked 9 Times in 7 Posts	Many thanks, I will give this a try.