Knocking under car gear stick area/high idle

cjdonny · 3rd December 2013, 06:53

Just looking for a heads up started monday
Not had chance to look yet

Knocking from gearstick area over bumps

Also separate issue car seems to be idling high just over 1 on rev counter

cjdonny · 3rd December 2013, 06:59

Engine/gearbox mount?
If so poly or std replacement

Mike Noc · 3rd December 2013, 08:06

Best to include your engine type in the panel on the left if you want help with the fast idle.

The diesels are drive by wire and the petrols aren't.

chipsceola · 3rd December 2013, 08:32

Can be a lot of movement at front exhaust, if rear box strap or rubbers have failed, easy first check and well worthwhile, you'll be surprised how much noise & vibration it will cause.

cjdonny · 3rd December 2013, 09:11

Cheers
2.5 160 engine

stevestrat · 3rd December 2013, 09:33

Quote:

Originally Posted by chipsceola

Can be a lot of movement at front exhaust, if rear box strap or rubbers have failed, easy first check and well worthwhile, you'll be surprised how much noise & vibration it will cause.

If one of the rear rubbers fails you get a lot more than a knocking going over humps, believe me, I've just had one go and the rattling is truly horrendous, even with the engine idling!

On the other hand, when the rubbers start getting tired they allow more exhaust movement which brings the cross plates that run under the system into range, what you are probably hearing is the system hitting the cross plates, had that as well and the knocking does travel along the system and appear to be coming from the gearbox area. New rubbers should cure the problem and as an added safeguard some have stuck a couple of washers between the cross plates and floor.

Regarding the idle, the revcounters aren't desperately accurate, my idle speed is set correctly but according to the revcounter it's about 150 rpm low. Idle speed can only be adjusted by a T4 computer, does it sound high?

t5tart · 3rd December 2013, 10:34

if the idle is stuck high I would suspect a IACV sticking or vacuum leak

cjdonny · 3rd December 2013, 11:46

Cheer yes it does sound high
More so since I got it few month ago

Just had some work done plugs and alt belt possible its disturbed a pipe

Might have to get mr clutch Andy back out

I'll check the rubbers

cjdonny · 3rd December 2013, 16:20

ok so quick look a rubber off the back box had come off Knocking has gone

high ideal haha:xmas-smiley-002: well went on a little trip out of town noticed the revs had dropped down under 1000

so im sure the only reason for this was auto choke? in a morning reving the car more

only other issue i have is a jerk when changing gear or taking foot of the acelerate pedal? could this be the engine/gearbox mount

as its a common fail

chipsceola · 3rd December 2013, 16:24

that's the second one this week, knocking from front, problem at rear and both were the rubber hanger!

3rd December 2013, 06:53	#1
cjdonny Avid contributor MG ZT V6 177 Join Date: Sep 2013 Location: Doncaster Posts: 226 Thanks: 90 Thanked 15 Times in 14 Posts	Knocking under car gear stick area/high idle Just looking for a heads up started monday Not had chance to look yet Knocking from gearstick area over bumps Also separate issue car seems to be idling high just over 1 on rev counter __________________ 51st ZT in Zircon Silver Metallic (code: MUM) to be made out of 864 Zircon Silver Metallic ZTs Remapped

3rd December 2013, 06:59	#2
cjdonny Avid contributor MG ZT V6 177 Join Date: Sep 2013 Location: Doncaster Posts: 226 Thanks: 90 Thanked 15 Times in 14 Posts	Engine/gearbox mount? If so poly or std replacement __________________ 51st ZT in Zircon Silver Metallic (code: MUM) to be made out of 864 Zircon Silver Metallic ZTs Remapped

3rd December 2013, 08:32	#4
chipsceola This is my second home Jaguar XF 3.0D Join Date: Nov 2010 Location: Southampton Posts: 4,364 Thanks: 119 Thanked 509 Times in 426 Posts	Can be a lot of movement at front exhaust, if rear box strap or rubbers have failed, easy first check and well worthwhile, you'll be surprised how much noise & vibration it will cause. __________________ Chips

3rd December 2013, 09:11	#5
cjdonny Avid contributor MG ZT V6 177 Join Date: Sep 2013 Location: Doncaster Posts: 226 Thanks: 90 Thanked 15 Times in 14 Posts	Cheers 2.5 160 engine __________________ 51st ZT in Zircon Silver Metallic (code: MUM) to be made out of 864 Zircon Silver Metallic ZTs Remapped

3rd December 2013, 10:34	#7
t5tart Posted a thing or two MG ZT cdti Join Date: Jun 2010 Location: Northants / Bucks border Posts: 1,815 Thanks: 260 Thanked 204 Times in 182 Posts	if the idle is stuck high I would suspect a IACV sticking or vacuum leak __________________ now with ZT Diesel power after killing the connie and the zt180 combusting see my scrapbook thread check your sunroof drains and plenum drains http://www.buddy-icons.info/img/smile/1609.gif members who do t4 diagnostics map

3rd December 2013, 08:06	#3
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,560 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Best to include your engine type in the panel on the left if you want help with the fast idle. The diesels are drive by wire and the petrols aren't.

3rd December 2013, 11:46	#8
cjdonny Avid contributor MG ZT V6 177 Join Date: Sep 2013 Location: Doncaster Posts: 226 Thanks: 90 Thanked 15 Times in 14 Posts	Cheer yes it does sound high More so since I got it few month ago Just had some work done plugs and alt belt possible its disturbed a pipe Might have to get mr clutch Andy back out I'll check the rubbers __________________ 51st ZT in Zircon Silver Metallic (code: MUM) to be made out of 864 Zircon Silver Metallic ZTs Remapped

3rd December 2013, 16:20	#9
cjdonny Avid contributor MG ZT V6 177 Join Date: Sep 2013 Location: Doncaster Posts: 226 Thanks: 90 Thanked 15 Times in 14 Posts	ok so quick look a rubber off the back box had come off Knocking has gone high ideal haha:xmas-smiley-002: well went on a little trip out of town noticed the revs had dropped down under 1000 so im sure the only reason for this was auto choke? in a morning reving the car more only other issue i have is a jerk when changing gear or taking foot of the acelerate pedal? could this be the engine/gearbox mount as its a common fail __________________ 51st ZT in Zircon Silver Metallic (code: MUM) to be made out of 864 Zircon Silver Metallic ZTs Remapped

3rd December 2013, 16:24	#10
chipsceola This is my second home Jaguar XF 3.0D Join Date: Nov 2010 Location: Southampton Posts: 4,364 Thanks: 119 Thanked 509 Times in 426 Posts	that's the second one this week, knocking from front, problem at rear and both were the rubber hanger! __________________ Chips