Over Revving when cold V6

janker · 6th September 2021, 18:05

Hi everybody
I have a Mg zt 190 V6 petrol 2001 , I have asked this question a few time so sorry for that but have tried different solutions.
Only when its cold does this happen it starts up fine idling about 1200rpm which i believe is about right but after travelling 100yds and stop at junction it is idling at nearly 1800rpm soon as it begins to get warm perfect and idles at 750rpm.
I brought a brand new Throttle body and fitted it with new rubber seal, Also fitted the Kaiser setup so instead of keyhole method removed manifolds etc so thought i would replace all new seals and gaskets.
Thought i might of cured my problem but still remains and yes no cable or linkage issues with throttle body.
My question is i have recently put Toaf on my laptop but only checked to make sure it connects to my car and it works but i havent got a clue how to use it and wondered if anybody could advise what i could maybe look at to help me see this problem i have if its possible.
many thanks for reading

xsport · 6th September 2021, 19:27

while you were in there did you replace the temperature sensor ? you could run the temp diagnostics to see if its giving the correct readings. it may be eratic at low temp. nothing lost here ...

janker · 6th September 2021, 20:29

Quote:

Originally Posted by xsport

while you were in there did you replace the temperature sensor ? you could run the temp diagnostics to see if its giving the correct readings. it may be eratic at low temp. nothing lost here ...

Hi yes replaced temp sensor thanks.

xsport · 7th September 2021, 20:29

wont do you any harm to still run the I.P.K diagnostic whilst shes warming up. there are numerous threads on here how to"s if you dont know.

xsport · 7th September 2021, 20:35

the map sensor on the throttle body is easy to remove and clean if you have not tried this. i spayed mine with carb cleaner very gingerly !! be carefull.

6th September 2021, 18:05	#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	Over Revving when cold V6 Hi everybody I have a Mg zt 190 V6 petrol 2001 , I have asked this question a few time so sorry for that but have tried different solutions. Only when its cold does this happen it starts up fine idling about 1200rpm which i believe is about right but after travelling 100yds and stop at junction it is idling at nearly 1800rpm soon as it begins to get warm perfect and idles at 750rpm. I brought a brand new Throttle body and fitted it with new rubber seal, Also fitted the Kaiser setup so instead of keyhole method removed manifolds etc so thought i would replace all new seals and gaskets. Thought i might of cured my problem but still remains and yes no cable or linkage issues with throttle body. My question is i have recently put Toaf on my laptop but only checked to make sure it connects to my car and it works but i havent got a clue how to use it and wondered if anybody could advise what i could maybe look at to help me see this problem i have if its possible. many thanks for reading __________________ 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.

6th September 2021, 19:27	#2
xsport Posted a thing or two rover 75 club se Join Date: Apr 2011 Location: Leicester Posts: 1,659 Thanks: 358 Thanked 419 Times in 310 Posts	while you were in there did you replace the temperature sensor ? you could run the temp diagnostics to see if its giving the correct readings. it may be eratic at low temp. nothing lost here ...

7th September 2021, 20:29	#4
xsport Posted a thing or two rover 75 club se Join Date: Apr 2011 Location: Leicester Posts: 1,659 Thanks: 358 Thanked 419 Times in 310 Posts	wont do you any harm to still run the I.P.K diagnostic whilst shes warming up. there are numerous threads on here how to"s if you dont know.

7th September 2021, 20:35	#5
xsport Posted a thing or two rover 75 club se Join Date: Apr 2011 Location: Leicester Posts: 1,659 Thanks: 358 Thanked 419 Times in 310 Posts	the map sensor on the throttle body is easy to remove and clean if you have not tried this. i spayed mine with carb cleaner very gingerly !! be carefull.