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post #1 of 18 (permalink) Old 24-08-2011, 19:06 Thread Starter
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Rough running problems. Cdti

Seems to be a common question this one.
But mine seems a bit different.

Several things really.

Main problem is coughing and 'missing', although I realise a diesel doesn't literally miss like a petrol.
I've seen posts about leakback etc, and my car has done 175k.

No receipts for injectors in its history.
Was fine when I picked it up 3k miles ago. And had been fine till now.

Has synergy 2 and pierberg maf fitted by me. Was fine on that too. And running great for a while.

Went to Norwich (300 miles) an back last week.
I broke down 2 times on the way there. Car started to cough and splutter and then cut out on the 3rd lane of the m25.....
Engine warning light came on.
Car started again but I didn't dare run it with light on. Left it 5 mins and had a fiddle about under the bonnet.

Eventually tried it again and the light went out. So I carried on my journey.

Spluttering on and off persists. Sometimes cuts out at idle. Always starts though.

And always starts fine from cold too.

Have turned the power section of synergy 2 off now and no really made much difference to splutter.
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post #2 of 18 (permalink) Old 24-08-2011, 19:23
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Quote:
Originally Posted by blinkinink View Post
Seems to be a common question this one.
But mine seems a bit different.

Several things really.

Main problem is coughing and 'missing', although I realise a diesel doesn't literally miss like a petrol.
I've seen posts about leakback etc, and my car has done 175k.

No receipts for injectors in its history.
Was fine when I picked it up 3k miles ago. And had been fine till now.

Has synergy 2 and pierberg maf fitted by me. Was fine on that too. And running great for a while.

Went to Norwich (300 miles) an back last week.
I broke down 2 times on the way there. Car started to cough and splutter and then cut out on the 3rd lane of the m25.....
Engine warning light came on.
Car started again but I didn't dare run it with light on. Left it 5 mins and had a fiddle about under the bonnet.

Eventually tried it again and the light went out. So I carried on my journey.

Spluttering on and off persists. Sometimes cuts out at idle. Always starts though.

And always starts fine from cold too.

Have turned the power section of synergy 2 off now and no really made much difference to splutter.
Hi the first thing i would do is disconnect the synergy box completely (remove it) your car will not run properly with the pierberg maf connected but if you have an old Bosch maf fit it or just disconnect it and the ECU will run in default mode, the following are things to check,
1 Plenum drain for water ingress, ECU wet.
2 Fuel pumps are running, under bonnet and intank.
3 Fuel filter, when was it last changed.
4 Leakback test done, this will say if any of the injectors are faultily.
5 EGR, either clean or bypass.
6 PCV, either clean or replace with filterless type.

This is just a few things to check as there are others but only if the problem persists, Steve
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post #3 of 18 (permalink) Old 24-08-2011, 20:01 Thread Starter
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Ok
Well I've already done:

Pcv clean and change to filterless element.

Egr bypass and intake clean.

Has just had fill service by me with new fuel filter included.

I do have the original maf. So will fit that back and see what happens.
I currently have the power turned off. Its just the maf section Working.

Will perform leakback as soon as I have the stuff needed to do it.
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post #4 of 18 (permalink) Old 24-08-2011, 20:02 Thread Starter
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Also it's a 2004 with a single pump which had already been replaced by the last owner apparently just before I bought it.
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post #5 of 18 (permalink) Old 24-08-2011, 20:50
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Quote:
Originally Posted by blinkinink View Post
Also it's a 2004 with a single pump which had already been replaced by the last owner apparently just before I bought it.
First I have heard of a single pump set up being replaced tbh, are you certain it only has the single pump, have you got a picture of the engine bay?

Simon
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post #6 of 18 (permalink) Old 24-08-2011, 22:21 Thread Starter
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No I'm not certain it is as I am not familiar with the differences.

But I can find out.
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post #7 of 18 (permalink) Old 25-08-2011, 09:09
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Try the connections as per this on Rover Rons site http://tuning-diesels.com/75Zt/R75serv.htm#CF
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post #8 of 18 (permalink) Old 25-08-2011, 14:00 Thread Starter
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Yeah, i've been through some of them.
Its like one big trial and error mission!!! lol
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post #9 of 18 (permalink) Old 25-08-2011, 15:42
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With all this rain we've been having , I would also check your plenum chambers. Are they dry?
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post #10 of 18 (permalink) Old 26-08-2011, 15:19 Thread Starter
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Ok so got a new symptom.

Engine has cut out twice in the last week. Both times producing engine check/warning light. The one with the exclamation mark.
First time light went out pretty quick and the engine started straight away anyway.

This time cut out coming up to a roundabout. Eml came on. Started straight away.

But the light is still on....

What should I do..?
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post #11 of 18 (permalink) Old 26-08-2011, 15:52
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Have you tried running with the MAF disconnected yet?


Mike
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post #12 of 18 (permalink) Old 26-08-2011, 16:24 Thread Starter
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No, not had the chance to get the air cover off yet. been working.
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post #13 of 18 (permalink) Old 26-08-2011, 16:55 Thread Starter
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Ok. So unplugged the maf sensor via the connection on the synergy connector. Power section is turned off too. So it's now running free of the synergy and maf....

Eml went out once disconnected.
And have run it home from the gym and its been fine so far.

But, with that in mind. the original symptoms have been erratic at best. Sometimes its fine.
So I will have to run it with the maf and synergy disconnected for a little while to see if any of the symptoms appear in the meantime.

I'd be surprised if the pierberg maf is faulty....?! It was used, but only 3 months old.

I bought the synergy 2 second hand mind and its the older type with the 3 maf and power sections...not 2.

Worth sending it to Rover ron for a checkup?
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post #14 of 18 (permalink) Old 26-08-2011, 21:58
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Quote:
Originally Posted by blinkinink View Post
Ok. So unplugged the maf sensor via the connection on the synergy connector. Power section is turned off too. So it's now running free of the synergy and maf....

Eml went out once disconnected.
And have run it home from the gym and its been fine so far.

But, with that in mind. the original symptoms have been erratic at best. Sometimes its fine.
So I will have to run it with the maf and synergy disconnected for a little while to see if any of the symptoms appear in the meantime.

I'd be surprised if the pierberg maf is faulty....?! It was used, but only 3 months old.

I bought the synergy 2 second hand mind and its the older type with the 3 maf and power sections...not 2.

Worth sending it to Rover ron for a checkup?
I would say your problem is with your tuning kit, i had the same one fitted and had some problems and mine was new, removed and no problems at all.
I think that the problem with them is the wiring and plug connections gives intermittent signals which gives erratic running, you are not first to have problems with these boxes, my advice would be for you to go back to standard and if you wish for more power etc go for a remap, Steve
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post #15 of 18 (permalink) Old 27-08-2011, 14:28
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I had same sort of symptoms on my cdt and it turned out to be fuel rail pressure sensor connections were dirty . just cleaned them n all fine . well worth a look i'd say n cheap fix 0000 . hth .
Rich
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post #16 of 18 (permalink) Old 27-08-2011, 14:35
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Hi,

By no means an expert but I had similar symptoms on a previous car and it turned out to be a split HT cable. Mine was visibly sparking in the dark. Once changed, it was back to normal idle etc.

Worth a look.
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post #17 of 18 (permalink) Old 27-08-2011, 15:10 Thread Starter
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Quote:
Originally Posted by Jamturbo View Post
Hi,

By no means an expert but I had similar symptoms on a previous car and it turned out to be a split HT cable. Mine was visibly sparking in the dark. Once changed, it was back to normal idle etc.

Worth a look.
Tis a diesel. No spark plugs. But thanks for the input.

As for the fuel pressure sensor, may well be that. Will buy some proper contact cleaner and do that.

Has been good since I disconnected my maf and then plugged synergy back in with power off. Might have been a dodgy connection There.

It has also been "over revving" when I let off the throttle?
Like when I go to change gear and dip the clutch and let off the throttle, the revs hold for a second or two, and sometimes actually increase before dropping?
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post #18 of 18 (permalink) Old 27-08-2011, 17:42
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Worth a squirt. As they say ,lol. good luck !!!
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