MG ZT 160 1.8 Turbo Cam sensor / revving problem above 4000 rpm

dggp · 26th June 2009, 19:54

Hi everyone, anyhelp would really be appreciated as im having all sorts of problems with my Mg zt. its the petrol 1.8 turbo.

i've recently had the head gasket done but to be fair i had this problem before i got that done. my problem is that the car drives lovely until around 4000 / 5000 revs where it is like hitting a rev limiter and the car lurches violently.

i have a P 0340 error code which is the camshaft sensor and i have just changed this for a brand new item but i still get the same error which to me says that maybe the cam timing is out. would this affect the working of the sensor?

also i cant hear the turbo working, it doesnt seem to boost at all, would this be affected by the ecu because the cam sensor isn't working? i'd really apreciate any help or any ideas anyone has. thanks

Simon · 26th June 2009, 21:30

Welcome along to the Club

No expert on the subject but sometimes leaky pipes to and from the turbo can cause problems with performance so worth checking.

I also seem to recall that the crank sensor (or is the cam sensor, I forget now

) can sometimes take a little persuasion to seat properly in it's home. Whether this is the case this time round I do not know.

Hopefully others of a more knowledgeable disposition will be along shortly to assist.

sworks · 27th June 2009, 05:56

I have never seen a 1.8 cam sensor give problems (although there is always a first time) Some times if you use a scantool instead of T4 you can get spurious fault codes. It sounds as though the car may be over boosting, does it feel quicker than it used to be? if so, like simon says check the vacuum pipes on the boost solenoid and follow them down to the turbo checking there are no splits or have become disconnected. there are 3 on the turbo if i remember corectly

dggp · 27th June 2009, 09:10

i'll have a look at the pipes today and get back to you, i had someone look at it and they said they couldnt do anything until i changed the cam sensor, which i've done, but like i said because the fault code still appears after i wiped it off which was the confusing bit, thanks for getting back to me and ill let you know how i get on

Gman2 · 27th June 2009, 12:01

If you do some searches there are a number of posts on this subject and is not uncommon. I had a quite a violent jolt when flooring the car and it was sorted through new coil packs and leads. Others have sourced the problem with detached hoses from the turbo.

Greeners · 27th June 2009, 15:18

Bit of a long shot, but you could try disconnecting the battery for 30 mins. (radio code / sat nav shut down procedure)

This in effect will reset the ecu.

jaydeeuu · 27th June 2009, 18:29

Had this problem myself recently - diagnosed as a turbo wastegate issue, put this is on "search" and you will find plenty of advice.

26th June 2009, 19:54	#1
dggp Newbie zt cdti Join Date: Jun 2009 Location: tipton Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	MG ZT 160 1.8 Turbo Cam sensor / revving problem above 4000 rpm Hi everyone, anyhelp would really be appreciated as im having all sorts of problems with my Mg zt. its the petrol 1.8 turbo. i've recently had the head gasket done but to be fair i had this problem before i got that done. my problem is that the car drives lovely until around 4000 / 5000 revs where it is like hitting a rev limiter and the car lurches violently. i have a P 0340 error code which is the camshaft sensor and i have just changed this for a brand new item but i still get the same error which to me says that maybe the cam timing is out. would this affect the working of the sensor? also i cant hear the turbo working, it doesnt seem to boost at all, would this be affected by the ecu because the cam sensor isn't working? i'd really apreciate any help or any ideas anyone has. thanks

27th June 2009, 05:56	#3
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,069 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	I have never seen a 1.8 cam sensor give problems (although there is always a first time) Some times if you use a scantool instead of T4 you can get spurious fault codes. It sounds as though the car may be over boosting, does it feel quicker than it used to be? if so, like simon says check the vacuum pipes on the boost solenoid and follow them down to the turbo checking there are no splits or have become disconnected. there are 3 on the turbo if i remember corectly __________________ ................................................. 'Marmite' Possibly one of the most famous 75 tourers produced! left the production line as the last of only Three Rover 75 tourers produced in Trophy Yellow. 48 hours later Longbridge closed. The last sold ordered 75 Tourer. Paid for by the Phoenix Four and handed over by John Towers to the Warwickshire Northampton Air ambulance service as a Rapid Response vehicle

27th June 2009, 15:18	#6
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	Bit of a long shot, but you could try disconnecting the battery for 30 mins. (radio code / sat nav shut down procedure) This in effect will reset the ecu. __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

26th June 2009, 21:30	#2
Simon Banned - Join Date: Nov 2006 Location: - Posts: 10,318 Thanks: 0 Thanked 4 Times in 3 Posts	Welcome along to the Club No expert on the subject but sometimes leaky pipes to and from the turbo can cause problems with performance so worth checking. I also seem to recall that the crank sensor (or is the cam sensor, I forget now ) can sometimes take a little persuasion to seat properly in it's home. Whether this is the case this time round I do not know. Hopefully others of a more knowledgeable disposition will be along shortly to assist.

27th June 2009, 09:10	#4
dggp Newbie zt cdti Join Date: Jun 2009 Location: tipton Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	i'll have a look at the pipes today and get back to you, i had someone look at it and they said they couldnt do anything until i changed the cam sensor, which i've done, but like i said because the fault code still appears after i wiped it off which was the confusing bit, thanks for getting back to me and ill let you know how i get on

27th June 2009, 12:01	#5
Gman2 Posted a thing or two ZTT+ 1.8T, mgf 1.8 Join Date: Sep 2007 Location: Warrington Posts: 1,550 Thanks: 28 Thanked 65 Times in 42 Posts	If you do some searches there are a number of posts on this subject and is not uncommon. I had a quite a violent jolt when flooring the car and it was sorted through new coil packs and leads. Others have sourced the problem with detached hoses from the turbo.

27th June 2009, 18:29	#7
jaydeeuu Regular poster 2003 MG ZT 1.8T Join Date: Mar 2009 Location: Barnsley Posts: 56 Thanks: 10 Thanked 0 Times in 0 Posts	Had this problem myself recently - diagnosed as a turbo wastegate issue, put this is on "search" and you will find plenty of advice.