MGZT-t Starting Problems by peterlomas



peterlomas
New to forum, hope somebody can help.
Own a 2005 CDti Ztt with 130k on the clock. Bought it in April and have done 10000 trouble free miles since. Recently it has developed a starting issue that I could do with some help with. Have read many posts about cars that dont start at all, mine does start just doesnt always start first time and when she does she needs a rev to get going smoothly. Previously she barely turned over and was running smoothly (ish, its a diesel after all!) (though has always been a little on the noisy side in my opinion) Other than that she runs fine. Since this started I have noticed a slight drop on economy from 40 to 36mpg on similar use. Dont want to just start changing parts at random, was hoping that there is somone outhere that had the same symptoms?

Posted 14 Sep 2015, 14:27 #1 

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Duncan
Is it only when the engine is warm that it won't start? If yes, probably cam sensor. If its worse when cold, its likely to be an injector 'leaking back' which would also correspond to needing a bit of a rev before it runs right. Have a search for injector leakback.
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Posted 14 Sep 2015, 16:58 #2 


peterlomas
Thanks for your quick reply Duncan. Its mostly when cold in the mornings though not exclusively, started okish this morning and would probasbly be ok if I went back out now and tried it again. but by tonight it might struggle again. Would this cause a drop in economy?

Posted 15 Sep 2015, 07:06 #3 


peterlomas
So far it has never not started but am guessing it will only get worse in time!

Posted 15 Sep 2015, 09:26 #4 

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Duncan
I would expect it to cause a drop in economy according to the trip computer, but not necessarily in real world, but I'm no expert. I believe theres a test you can do to check leakback.
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Posted 15 Sep 2015, 20:10 #5 


peterlomas
Will look at doing the leakback test this weekend as I expect it will only get worse the longer I leave it. Was looking at your Nano Meets site yesterday, might see if I can come to your next one, I live near Nuneaton in my caravan during the week for work and only go back to Suffolk (home) at the weekend, so assuming the boss hasnt already made plans for that weekend it should be possible

Posted 16 Sep 2015, 07:58 #6 


peterlomas
Typed "caravan" and it came on as fibre glass shed!! lol

Posted 16 Sep 2015, 07:59 #7 

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Duncan
It's Mick's sense of humour. You can write car avan and get away with it...... Unless he's watching.

I grew up in Nuneaton, and my folks still live there.
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Posted 16 Sep 2015, 18:54 #8 

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Mick
(Site Admin)
Sense of humour? Moi? How very dare you. ;)

Posted 16 Sep 2015, 21:05 #9 

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Bernard
Mick wrote:Sense of humour? Moi? How very dare you. ;)


Oh, I don't know. Don't forget you have been taking lessons from J├╝rgen. :gmc:

Posted 17 Sep 2015, 09:01 #10 


peterlomas
Lost on me I am afraid. Going to take car in to have leakback done, going to Diesel diagnostics in coventry tomorro afternoon

Posted 17 Sep 2015, 12:23 #11 

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Borg Warner
Whereabouts in Suffolk are you from?

Best of luck with the fix.

Gary M.

Posted 17 Sep 2015, 17:26 #12 


peterlomas
Thanks Gary - fingers crossed it doesnt end up a full set of injectors!!
Stowmarket is home but work away from home near Nuneaton during the week

Posted 18 Sep 2015, 09:37 #13 

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Borg Warner
Ha a fellow Stowmartian. :-D :-D

If you need a hand I'm quite good at supping tea, taking a deep intake of breath and saying "gonna cost ya!".

Gary M.

Posted 18 Sep 2015, 20:07 #14 


peterlomas
Might have been more use than the guy I took it too. When I took car in to have it checked out all the guy did was say it needed a full diagnostic and couldn't do it till end of next week at earliest! Waste of time!
Think I might have a go at leakback test myself at work next week

Posted 19 Sep 2015, 19:51 #15 


peterlomas
Well now for an update.... After waste of time taking car to a specialist I decided to try to diagnose it myself. So I bought a Sealey VS2048 leakback test kit for myself. Tests now completed and my question now becomes.... how much is ok. The kit has a set of bottles for the running test, not sure what the measurements are but using them as comparison results were as follows for cylinders one through to four. 5, 4.7, 6,4. 5. For the cranking test the set has a set of glass tubes to plug straight into the injectors. Again not sure what the measurements are graduated in but got results of 3.5, 3, 3.7, 2.2.
This generates the obvious question hoe much is acceptable and/or how close together should the readings be?. obviously I dont want to shell out a weeks wages on a full set of injectors if I dont need them but if I have to .....

Posted 23 Sep 2015, 17:30 #16 


PaulT
You can have injectors cleaned
Paul

That apart Mrs Lincoln, did you enjoy the play

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Posted 23 Sep 2015, 18:17 #17 

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Duncan
I've never done a leakback test myself, so I don't know what the numbers should be. In cranking the worst is significantly more than 50% higher than the best. That makes me think there might be an issue but I hope someone can advise from experience?
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Posted 23 Sep 2015, 19:52 #18 


peterlomas
After cleaning out EGR (Exhaust Gas Recirculation Valve), inlet manifold, MAP sensor, starting SEEMS to have improved. Started on all four each time since I have done this so was hoping I didn't have to do anything more, but I would like to understand the significance and importance of the differences in the leakage volumes

Posted 23 Sep 2015, 20:15 #19 

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Arctic
(Trader)
Hi Peter.
Have a quick read of this Mike and Brian know quite a bit about this, early this year I/we me & Lyndon had to change two of his injectors due to leak back, once changed the car as been fine since so I am told, Arctic
http://www.the75andztclub.co.uk/forum/s ... est&page=3

Posted 28 Sep 2015, 06:18 #20 


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