CX GTI Turbo. Thinking caps on!

Our most popular forum is for Citroën problems, discussions and chat.
Specialising in AX, BX, ZX, Xantia,C5, Xsara, Saxo and XM. CX, 2cv & Berlingo, all are welcome.NOT for selling cars/parts!

Moderator: RichardW

Bilkob
Posts: 71
Joined: 23 Feb 2017, 20:16
Location: Teddington
My Cars: Citroen CX
Citroen C15
x 6

CX GTI Turbo. Thinking caps on!

Post by Bilkob » 17 Nov 2017, 08:14

I am the lucky owner of a series 2, Turbo 1 (non intercooled) GTI Turbo. The car had been stored for several years before I got it and over the last 10 or so months I've been slowly-or sometimes very quickly! :-D bringing it back to life
Lots of jobs done and it's now going rather well.
However, it has one rather annoying problem. When hot, ie fully up to operating temp, if left idling it will start to splutter and then cut out. This takes about 5 minutes to manifest itself.
If you catch it JUST before it dies and blip the throttle, it's ok........
It is NOT any of the following
Crank sensors-replaced with Ford items
Either of the 'ECUs'
Overheating
Fuel pump
Idle control valve SEEMS fine, as in it's clean and the little disc inside moves freely
SO, I think I'm down to Fuel pressure regulator. Throttle position sensor. Knock sensor(?). Overheating wiring somewhere. Or a Ghost!
I'd WELCOME any thoughts/wisdom
0x

Peter.N.
Moderating Team
Posts: 8749
Joined: 02 Apr 2005, 16:11
Location: Charmouth,Dorset
My Cars: Currently:
Peugeot 406 LX Hdi estate, 01, blue
Peugeot 406 GLX Hdi estate, 01, blue

In the past: 3, CX td Safaris and about 7, XM td estates. Lovely cars.
x 102

Re: CX GTI Turbo. Thinking caps on!

Post by Peter.N. » 17 Nov 2017, 11:06

Mmm, Lovely cars I had a diesel one for some years, can't help you with yours I'm afraid. The last petrol vehicle I had used a carburetor and distributor. :?

Peter
0x

RichardW
Forum Treasurer
Posts: 8153
Joined: 07 Aug 2002, 17:12
Location: United Kingdom
My Cars: C4 Grand Picassos:
MK1 '08 1.6 HDi 110
MK2 '17 1.6 BlueHDi 120
x 199

Re: CX GTI Turbo. Thinking caps on!

Post by RichardW » 17 Nov 2017, 11:13

David Hallworth had similar trouble with his... in his blog, starting on this page: https://www.frenchcarforum.co.uk/forum/ ... start=1455
0x
Richard W
His and Hers C4 Grand Picassos!

User avatar
Zelandeth
Donor 2016
Posts: 2563
Joined: 17 Nov 2014, 00:36
Location: Milton Keynes
My Cars: 1989 Saab 900i Auto
1996 Citroen Xantia Activa
1975 AC Model-70
1985 Sinclair C5
1993 Lada Riva 1.5E Estate
x 170

Re: CX GTI Turbo. Thinking caps on!

Post by Zelandeth » 17 Nov 2017, 14:34

Ignition coil breaking down as it warms up?
0x
Current fleet:
89 Saab 900i Auto. 1996 Citroen Xantia 2.0T Activa. 85 Sinclair C5. 93 Lada Riva 1.5EFi Estate, 75 AC Model 70.

Bilkob
Posts: 71
Joined: 23 Feb 2017, 20:16
Location: Teddington
My Cars: Citroen CX
Citroen C15
x 6

Re: CX GTI Turbo. Thinking caps on!

Post by Bilkob » 17 Nov 2017, 17:16

It COULD be.......but they are good replacement coils (Stan)
My gut feeling is either airflow meter, or fuel pressure regulator or cylinder head temp sender
Interestingly, when I swapped the ignition AEI unit for another one, it ran like s*€t and had less grunt......odd!
The car will happily cruise at legal, and perhaps other speeds for several hours, it's only when hot and idling it's an issue
It'll idle from cold start all the way up to when fans kick in with no issues at all
0x

Online
User avatar
white exec
Moderating Team
Posts: 2365
Joined: 21 Dec 2015, 13:46
Location: Sayalonga, Malaga, Spain
My Cars: 1996 XM 2.5TD hatch, 2003 RAV4.2 D4D
previously 1989 BX19RD, ZX 1.9D auto, Xantia 1.8i auto
x 273

Re: CX GTI Turbo. Thinking caps on!

Post by white exec » 17 Nov 2017, 17:51

It's not idling badly only when the fans are running is it?
Thinking big (twin fans?) extra load on the alternator at idle speed, and maybe a voltage taking a dive somewhere.

On another tack - fuel vapour lock in the hot engine compartment? Pouring cold water over exposed fuel lines/pump etc can sometimes tell you something.
1x
Chris

Bilkob
Posts: 71
Joined: 23 Feb 2017, 20:16
Location: Teddington
My Cars: Citroen CX
Citroen C15
x 6

Re: CX GTI Turbo. Thinking caps on!

Post by Bilkob » 17 Nov 2017, 19:36

Thanks for replies..
No, it idles absolutely fine, hot or cold until it dies and it runs, pulls and drives really nicely, at all times, under load, etc, until left idling when warm
I think my next elimination will be fuel pressure regulator
Anyone know the part number?
0x

User avatar
xantia_v6
Forum Admin Team
Posts: 5088
Joined: 09 Nov 2005, 23:03
Location: Christchurch, New Zealand
My Cars: -
1997 Citroen Xantia V6 (France)
1999 Citroen XM V6 ES9 (France)
2011 Peugeot 308 CC THP 155 (NZ)
1975 Jaguar XJ-S pre-HE (NZ)
x 162

Re: CX GTI Turbo. Thinking caps on!

Post by xantia_v6 » 17 Nov 2017, 19:45

If it has a separate ignition amplifier driving the coils(s), I would suspect that. Also think about the condition of the spark plug leads.
Does the idle RPM drop before it stumbles?
You might leave it to stop and then pull a spark plug to see if the colour looks normal.
0x

Bilkob
Posts: 71
Joined: 23 Feb 2017, 20:16
Location: Teddington
My Cars: Citroen CX
Citroen C15
x 6

Re: CX GTI Turbo. Thinking caps on!

Post by Bilkob » 17 Nov 2017, 21:42

I'm pretty sure there's no amplifier, and no, no rpm drop, just a splutter and legs in the air!
I think my next obvious course of action is to get it to cut out, then pull a plug lead and check for spark
0x

aerodynamica
Posts: 757
Joined: 26 Dec 2007, 19:10
Location: Glasgow
My Cars: 1993 Xantia 1.9 TD VSX Mk1 Sinker A.K.A Slugmobile 13'
'Old Katy'
1968 ID19B Confort
x 13

Re: CX GTI Turbo. Thinking caps on!

Post by aerodynamica » 20 Nov 2017, 01:08

Hi, sorry to hear of your woes! It might be worth checking the fuel pump double relay in case it is having a little fit and cutting the fuel supply as that's the only thing that I can think of that would cause a sudden stop. If the ignition coils were faulting out I think it would run on two cylinders, rough as a bag of spanners, before cutting out because one coil supplies spark plug 1 and 3 and the other does 2 and 4.
Could also be power to something major is cutting (like fuel relay) but I also recall a CX 25i (similar) story where the engine cut out mysteriously and it was caused by the steering column grazing the big bunch of keys the chap had on the ignition and tugging it when he turned left.... So I'd give the ignition key a prod or two to see it that upsets it because you never know!
0x
Graeme M
1993 Xantia 1.9 TD VSX Mk1 Sinker. 'Old Katy'
1968 ID 19B

Bilkob
Posts: 71
Joined: 23 Feb 2017, 20:16
Location: Teddington
My Cars: Citroen CX
Citroen C15
x 6

Re: CX GTI Turbo. Thinking caps on!

Post by Bilkob » 20 Nov 2017, 09:21

My woes aren't too bad, but thanks for concern!
It's not dangling keys
I've checked big blue and the other fuel relay, but could still be them I guess, they now live out of harms way, covered in grease and WD.....
I will try a spark plug test in next few days
Also, I did check fuel pressure regulator by gently poking a small Allen key down hole on top. It was rock hard, I'm guessing that's not correct??!!
0x

User avatar
Timmo
Posts: 1106
Joined: 11 Jul 2011, 15:41
Location: Bottom Left!
My Cars: '89 309gti - long time gone
'90 Bx 16v - sad slowly loosing the battle with mother nature and the sea air
'99 Clio 1.4 etoile, thankfully passed on,
'98 Xantia 1.9td estate, 170k, Such a great car
'04 modus 1.4, good ladies drive
x 31

Re: CX GTI Turbo. Thinking caps on!

Post by Timmo » 20 Nov 2017, 10:34

I am utterly unable to help as know nothing of cx's, and little of engine electricals, But does it start back up fine after its splutter?
The only reason I ask is back when I redid my head on the bx 16v i fitted a new cap, plugs, arm etc. Ran Beautifully up until it got hot, then spluttered and died, only way it would start was to let it cool, then repeat the process, after much head scratching, retiming, checking, i put the old cap on and it ran perfectly for the next 5 years till i laid it up, i was adamant it wasn't the cap as it was New, said cap went to another mi engine and ran faultlessly, that brand and mine didn't get on!
0x
After All, I am the Cornish one!

'90 G P2 Bx 16v. 115k
'98 S P2 Xantia 1.9td SX estate.170k+ish
'04 modus 1.4

wurlycorner
Posts: 1371
Joined: 30 Oct 2012, 23:37
Location: Chelmsford, Essex
My Cars: Lots of CXs...
A couple of Xantia...
Lots of Prelude's...
And a Sunny.
x 44

Re: CX GTI Turbo. Thinking caps on!

Post by wurlycorner » 20 Nov 2017, 14:47

:eh: Argh, I feel your pain - things like this are a nightmare to diagnose on a CX :roll:
And then you get one like my T2, where you open the bonnet, see that all the vacuum lines are shot (split/hanging off) and yet the engine runs absolutely spot on :idea1:

For yours, I definitely think this is a heat soak problem.
Question - does this only happen when the car is being driven, or also when warmed up at idle?
If the latter, does it make any difference if it is warmed up with the bonnet open? (does the problem not manifest itself if bonnet left open?)
0x
--
Iain.

2x '85 CX GTi Turbo s1 (metallic blue and green)
2x '85 CX GTi Turbo s2 t1 (metallic silver and grey)
'88 CX GTi Turbo s2 T2 (metallic light blue)
CX DTR T2 Safari (silver)
2x '96 Xantia Activa (Black and Metallic Green)
'01 C5 2.0 HDi LX Estate (Blue)

Bilkob
Posts: 71
Joined: 23 Feb 2017, 20:16
Location: Teddington
My Cars: Citroen CX
Citroen C15
x 6

Re: CX GTI Turbo. Thinking caps on!

Post by Bilkob » 20 Nov 2017, 19:20

OK. I've made some discoveries! It SEEMS THAT with the bonnet open, the car will idle for ever, and with it shut, it cuts out!
All the same symptoms as before, so it MUST BE heat soak/ build up.....
I did try and whip a plug out and crank it after it died, but it started straight up again, on 3!
Fuel starvation?
Still perhaps coils overheating?
After it cuts out, it's still got loads of turning power for starter so it can't be battery/voltage can it??
Am I missing something obvious??
Keep the answers coming please!
0x

Online
Hell Razor5543
NOT Alistair or Simon
Posts: 7955
Joined: 01 Apr 2012, 09:47
Location: Reading
My Cars: C5 Mk1 VTR estate, Icelandic Grey (I think she is called "Bluebird")
x 425

Re: CX GTI Turbo. Thinking caps on!

Post by Hell Razor5543 » 20 Nov 2017, 19:27

I wonder if the bonnet (when it is closed) is pinching a pipe, causing some form of starvation?
0x
James
ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX

C5 VTR HDi estate, 76518762
Out amongst the stars, looking for a world of my own!