New owner with MG ZT cdti problem - Page 3

smudge · 4th April 2015, 08:44

Quote:

Originally Posted by lightningmark

Your problem is the egr is sticking. Take it off and clean it or better still get a bypass

I've already cleaned the EGR, it's spotless and the valve is working smoothly and correctly. :-)

smudge · 4th April 2015, 17:39

Disconnected the vacuum pipe from the EGR....no change..still losing boost after a couple of miles.....still kicking back in at 4k revs and running ok for a little while before doing it all over again.

smudge · 4th April 2015, 18:00

One more piece of information that might help.....the previous owner has fitted a non return valve between the under bonnet fuel pump and the fuel filter.....he said he fitted the non return valve to stop fuel draining back to the tank over night as it was making it difficult to start in the morning?

Maybe it is fuel starvation after all?

spyder · 4th April 2015, 18:16

Some non- return valves have built in restrict its. No reason for it to drain, unless there is an air leak. Check the pipes to the FBH (fuel)

smudge · 4th April 2015, 18:35

However...I've just tried it with the non return valve removed......no change!

I don't have a FBH (fuel burning heater?)....

FROGGY · 4th April 2015, 19:01

Have you done a leak-back test on the injectors?
All kinds of strange things can happen if you have one or two leaky injectors.

smudge · 4th April 2015, 19:12

No, I haven't done that yet.
The fault codes that I had return after clearing
P1e30- boost control
P0500- speed sensor
P1470- boost control
......would suggest a boost problem?
Then there's the speed sensor.....dodgy signals to the ECU?

FROGGY · 4th April 2015, 19:27

Quote:

Originally Posted by smudge

No, I haven't done that yet.
The fault codes that I had return after clearing
P1e30- boost control
P0500- speed sensor
P1470- boost control
......would suggest a boost problem?
Then there's the speed sensor.....dodgy signals to the ECU?

Too technical for me..............
Wait for some of the T4 guys to respond.

smudge · 5th April 2015, 21:07

Just found this;
P1470 Variable intake manifold actuator 1 - valve always open Variable intake manifold actuator 1 function - valve always opened

What is a 'Variable intake manifold actuator' ?

Has the diesel even got them? Also apparently the Mil light should be showing with that code.......it isn't?

Mike Noc · 5th April 2015, 21:27

Quote:

Originally Posted by smudge

Has the diesel even got them?

In a word no.

4th April 2015, 18:16	#24
spyder This is my second home 75 CDT Auto Tourer , Rover 45 , Astra, Zaffira, Chev Captiva Join Date: Mar 2011 Location: Wilts Posts: 3,342 Thanks: 203 Thanked 436 Times in 360 Posts	Some non- return valves have built in restrict its. No reason for it to drain, unless there is an air leak. Check the pipes to the FBH (fuel) __________________ Chrome skull caps, EGR cleaned (original housing), Mondeo lower mounting, 12V outlets in the armrest and tourer boot, cat fixed, working FBH, Lidl plenum covers, DD with reverse camera.New speakesr/Tweeters with MDF rings. wood dash, Memory leather seats, wooden finished steering and handbrake, Xenon headlights.

4th April 2015, 19:01	#26
FROGGY I really should get out more....... MG ZT CDTI Join Date: Sep 2007 Location: 17500 REAUX, CHARENTE-MARITIME Posts: 2,749 Thanks: 2 Thanked 133 Times in 90 Posts	Have you done a leak-back test on the injectors? All kinds of strange things can happen if you have one or two leaky injectors. __________________ http://i200.photobucket.com/albums/a...ps628d4119.jpg IN THE BLACK NOW

5th April 2015, 21:07	#29
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	Just found this; P1470 Variable intake manifold actuator 1 - valve always open Variable intake manifold actuator 1 function - valve always opened What is a 'Variable intake manifold actuator' ? Has the diesel even got them? Also apparently the Mil light should be showing with that code.......it isn't? __________________ [SIGPIC][/SIGPIC] Last edited by smudge; 5th April 2015 at 21:24..

4th April 2015, 17:39	#22
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	Disconnected the vacuum pipe from the EGR....no change..still losing boost after a couple of miles.....still kicking back in at 4k revs and running ok for a little while before doing it all over again.

4th April 2015, 18:00	#23
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	One more piece of information that might help.....the previous owner has fitted a non return valve between the under bonnet fuel pump and the fuel filter.....he said he fitted the non return valve to stop fuel draining back to the tank over night as it was making it difficult to start in the morning? Maybe it is fuel starvation after all?

4th April 2015, 18:35	#25
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	However...I've just tried it with the non return valve removed......no change! I don't have a FBH (fuel burning heater?)....

4th April 2015, 19:12	#27
smudge Regular poster MG ZT Join Date: Mar 2015 Location: Roscommon Posts: 67 Thanks: 9 Thanked 1 Time in 1 Post	No, I haven't done that yet. The fault codes that I had return after clearing P1e30- boost control P0500- speed sensor P1470- boost control ......would suggest a boost problem? Then there's the speed sensor.....dodgy signals to the ECU?