MPG and running rich

cooper.mg190 · 23rd July 2016, 09:21

Hi all,

My MG ZT V6, passed the mot on wednesday, well happy,

Only problem i have now though, is the car is running rich, and my mpg is low,
after a 75 mile round trip yesterday the car is running at 23 mpg at 65 mph,

I know the car has been sat a while, but thought it would sort the computer issues out on a run,

Anyone got some insight on anything that could cause rich running on the V6.

Thanks in advance

MG ZTT V6 190+ 2001

Lancpudn · 23rd July 2016, 09:35

Quote:

Originally Posted by cooper.mg190

Hi all,

My MG ZT V6, passed the mot on wednesday, well happy,

Only problem i have now though, is the car is running rich, and my mpg is low,
after a 75 mile round trip yesterday the car is running at 23 mpg at 65 mph,

I know the car has been sat a while, but thought it would sort the computer issues out on a run,

Anyone got some insight on anything that could cause rich running on the V6.

Thanks in advance

MG ZTT V6 190+ 2001

Would it not have failed on the emissions on the MOT if it was running rich!

I had the battery off mine for a week or so whilst I tackled the welding jobs.
prior to that the MPG was showing a constant 28 MPG regardless of driving conditions. Since completing the jobs & installing a new battery the MPG has never gone above 19.3mpg and she runs as sweet as a nut.

cooper.mg190 · 23rd July 2016, 09:40

A work colleague was following me home last night, he msgd me when he got home and said the car smelt rich,
The emissions test was fine,

murphyv310 · 23rd July 2016, 10:02

Hi.
The emission test would normally show up over fuelling.
A couple of things though come to mind, is the air filter partially choked and could the shannon tube be clogging the intake?
If the mixture was so rich the Lambda sensors should be adjusting the mixture and if not surely the management light would be on.

cooper.mg190 · 23rd July 2016, 11:43

Took the car down to jiu jitsu today,
My fan was running with the engine off, thought it a bit strange,
Started her up and she ran very rough, hunting between the revs,
The EML came on with two codes,

P0112, Engine coolant temperature sensor 1 Circuit High

P0172 System Too Rich, Bank 1 and Bank 2.

murphyv310 · 23rd July 2016, 13:14

Coolant sensor has chucked it! It lives in the V and may be damaged by a leaking thermostat. The sensor when open circuit or disconnected will give all the symptoms you are getting including the running fan.

cooper.mg190 · 23rd July 2016, 21:56

Looks like i'll be spending more money,

Oh well, i love the car why not

I'm hoping i can remove it without taking everything apart,

Any ideas on the P0172 code?

cooper.mg190 · 23rd July 2016, 21:57

Am I right in saying there is only one coolant sensor?

23rd July 2016, 09:21	#1
cooper.mg190 Avid contributor MG ZT-T+ 190 Join Date: May 2015 Location: Birmingham Posts: 224 Thanks: 5 Thanked 24 Times in 24 Posts	MPG and running rich Hi all, My MG ZT V6, passed the mot on wednesday, well happy, Only problem i have now though, is the car is running rich, and my mpg is low, after a 75 mile round trip yesterday the car is running at 23 mpg at 65 mph, I know the car has been sat a while, but thought it would sort the computer issues out on a run, Anyone got some insight on anything that could cause rich running on the V6. Thanks in advance MG ZTT V6 190+ 2001 __________________ MG ZT-T 190+ Color Code LQW, Currently Being Rebuilt, Slowly but Surely,

23rd July 2016, 09:40	#3
cooper.mg190 Avid contributor MG ZT-T+ 190 Join Date: May 2015 Location: Birmingham Posts: 224 Thanks: 5 Thanked 24 Times in 24 Posts	A work colleague was following me home last night, he msgd me when he got home and said the car smelt rich, The emissions test was fine, __________________ MG ZT-T 190+ Color Code LQW, Currently Being Rebuilt, Slowly but Surely,

23rd July 2016, 10:02	#4
murphyv310 This is my second home Hyundai i10 998cc Join Date: Mar 2012 Location: Kilmarnock Posts: 6,602 Thanks: 2,088 Thanked 2,298 Times in 1,349 Posts	Hi. The emission test would normally show up over fuelling. A couple of things though come to mind, is the air filter partially choked and could the shannon tube be clogging the intake? If the mixture was so rich the Lambda sensors should be adjusting the mixture and if not surely the management light would be on. __________________ Cheers from Trevor MM0KJJ

23rd July 2016, 11:43	#5
cooper.mg190 Avid contributor MG ZT-T+ 190 Join Date: May 2015 Location: Birmingham Posts: 224 Thanks: 5 Thanked 24 Times in 24 Posts	Took the car down to jiu jitsu today, My fan was running with the engine off, thought it a bit strange, Started her up and she ran very rough, hunting between the revs, The EML came on with two codes, P0112, Engine coolant temperature sensor 1 Circuit High P0172 System Too Rich, Bank 1 and Bank 2. __________________ MG ZT-T 190+ Color Code LQW, Currently Being Rebuilt, Slowly but Surely,

23rd July 2016, 13:14	#6
murphyv310 This is my second home Hyundai i10 998cc Join Date: Mar 2012 Location: Kilmarnock Posts: 6,602 Thanks: 2,088 Thanked 2,298 Times in 1,349 Posts	Coolant sensor has chucked it! It lives in the V and may be damaged by a leaking thermostat. The sensor when open circuit or disconnected will give all the symptoms you are getting including the running fan. __________________ Cheers from Trevor MM0KJJ

23rd July 2016, 21:56	#7
cooper.mg190 Avid contributor MG ZT-T+ 190 Join Date: May 2015 Location: Birmingham Posts: 224 Thanks: 5 Thanked 24 Times in 24 Posts	Looks like i'll be spending more money, Oh well, i love the car why not I'm hoping i can remove it without taking everything apart, Any ideas on the P0172 code? __________________ MG ZT-T 190+ Color Code LQW, Currently Being Rebuilt, Slowly but Surely,

23rd July 2016, 21:57	#8
cooper.mg190 Avid contributor MG ZT-T+ 190 Join Date: May 2015 Location: Birmingham Posts: 224 Thanks: 5 Thanked 24 Times in 24 Posts	Am I right in saying there is only one coolant sensor? __________________ MG ZT-T 190+ Color Code LQW, Currently Being Rebuilt, Slowly but Surely,