got a problem with me car

[RC18B 911 turbo]

pulling away from a round about the other day my car sort of stuttered very slighlty then cut out by pulling away I mean that I had already negotiated the roundabout and was coming out the other side.

Then today as I was approaching the roundabout in 2nd gear it did it again.

When it cuts out though it is quite clean like as though I've just switched the ignition off just wandering if anyone has experienced this before. Do you think it might be electronic like the DME relay or something along those lines?

 

[Fen]

It will be electrical I bet, but what I'm not so sure. Start with the DME relay as it's cheap but it could be brank sensor, a broken wire, AFM etc.

 

[Fred Hindle]

What manouevres are you doing when this happens? Is the car leaning (not that Porsches lean) to one side or the other. Centrifugal force maybe causing a loose wire or something to loose contact. Does the car start immediately afterward, is there any hesitation in starting up?
Sounds a strange fault.
Find a big empty car park and drive the car in tight circles left and right to see if you can reproduce the cutting out.
Cheers,

 

[RC18B 911 turbo]

it does take a little bit to start up afterwards but seems to start better if I switch the alarm and imobiliser on and then off, then it's fine once it has started.

 

[peanut]

sounds like its probably related to your immobiliser system. Might be worth disconnecting it and bypassing it if you can . When they play up they give exactly the same symptoms. Very unlikely to be your DME relay.
DME relay problems are extremly rare but because its the only thing most non technical people can remember they automatically suggest it, not having the remotest idea how they work.
Its like everyone suggests you `format' your hard drive if you have a computer problem like its going to magically fix everything at a stroke.

As Fred suggests you should try some turning experiments to reproduce the circumstance in which it happens. Its more than co-incidence that it has happened at the same sort of location speed and manoever

 

[Diver944]

ORIGINAL: peanut

DME relay problems are extremly rare

Actually they are very common and if you own a 944 for more than a few years then it will wear out as it's purely a mechanical device that switches on and off every time you start the car. My S2 has needed two new ones in the past 9 years and my Turbo has needed one in the past 6 years. Everyone should carry a spare DME relay in the glovebox, for the sake of 20 quid it's always worth having a spare.

However you are right in that this doesn't sound like a DME relay problem at all []

 

[Fen]

Sorry peanut, I have to agree with Paul; the DME relay is the cause of this sort of issue more often than any other single component. Or maybe after 10 years, 5 examples and 120,000+ miles I don't know anything about 944s.

I also disagree it's anything like reformatting your hard drive as that will fix the majority of issues once you have rebuilt the PC. Sledgehammer to crack a nut, broadly similar to suggesting Jon fits a new engine because of the cutting out problem.

By contrast the immobiliser is very unlikely to be the cause in my opinion, though for sure it could be. I'd start with easy/cheap stuff before trying to bypass a device that by design is intended to be difficult to bypass myself.

 

[RC18B 911 turbo]

Thanks for the help everyone,

I'm not sure it is the Immobiliser because the the starter motor and engine turn over still afterwards but just doesn't start until I let it sort itself out a bit, whereas with the immobiliser on when I turn the ignition key nothing happens except all the pretty lights come one and that's it.

I only really just switch the immobiliser on and alarm on then off to pass the time away while it to sorts itself out really but it does also seem to help so it might be the immobiliser that caused it switch off.

Anyways I'm getting a DME relay tomorrow while I'm at work seeing as I work up the road from the Exeter OPC just to rule it out and it'll be a fairly cheap option due to me staff discount.

 

[peanut]

sorry Fen, knee jerk reaction,.... mouth kicked in before brain I'm afraid. []

 

[peanut]

here's a useful link to a clear explanation of what a DME relay does. Perhaps we should concider making it a sticky as it apparently seems to figure so commonly in running problems []

http://www.clarks-garage.com/pdf-manual/fuel-05.pdf

http://www.adrianstreather.com/docs/Corrections%20Pgs%20387%20&%20388.pdf

 

[Fen]

ORIGINAL: peanut


I don't wish to be critical but I should point out that neither of you or Paul has made a single suggestion to the enquirer to help him with his problem but rather you have used his thread to criticise another member who actually does understand mechanical, electrical and computer problems and has suggested some sensible suggestions to help.

May I respectfully suggest that in future you post on topic and with some useful information that helps the enquirer and not just clog up the thread unecessarily with non constructive critism of other members. I would be very interested in hearing any structured reasoning with evidence to back your claim however it should be the subject of another thread..

Oh yeah? Who was first to post a reply then, Lord sodding Lucan?

On the other hand who was it who said it was unlikely to be the DME when everyone who really knows the 944 will tell you that's a common failure and them went on to criticise my (note, that's my as in me, the guy who supposedly didn't offer any help) suggestion that Jon start by looking at this common fault by inferring I don't know what I'm talking about and just spouting something I don't understand that I heard somewhere once before. For your information I was at the side of the road in the peeing rain in Poole in a 944 Turbo with a failed DME relay in 1996, and I've replaced a few more since then so I KNOW about this problem.

May I respectfully suggest in future you get off your high horse and open your eyes before you start trying to discredit people who have been around for years and know these cars inside out.

Might be time to get back in your box, eh?

 

[peanut]

no need to be rude Fen just because someone doesn't agree with you if you can't make a reasoned argument to make a point then I suggest you don't reply . Being offensive does you no credit at all and isn't welcome on this or any forum

 

[homesea]

While Peanut and Fen slap each other with their handbags. I suggest Jon, it is the DME relay it sounds the same as when mine was playing up. Easy to spot if it is, pull the relay out. Then remove the plastic cover and on the circuit board you will probably see a crack round one of the solder joints. I have pictures of mine I can post if any help, also you can build a jumper out of 3 bits of wire then bridge the relay, to see if that's the problem or not. Immobilisers are usually very reliable that's why insurance company give you a discount. But saying that most immobilisers are 2 circuits, one on the ignition and one on the fuel. So it could be a fault on the fuel circuit.

 

[peanut]

heres another good link to DME / 02 sensor problems
http://www.clarks-garage.com/shop-manual/fuel-18.htm

quote
"I suggest Jon, it is the DME relay"

yes I think that suggestion has already been made lol ha [] but wouldn't you expect the DME relay to give problems intermitantly all the time and not just when the car accelerates or deaccelerates at roundabouts ? Its an easy cheap quick substitution anyway so as good a place to start as anywhere I guess

 

[Guest]

Right lads
Its a long shot but .... The waste gate may be sticking and causing her to overboost........! I had thsi problem on mine where she would boost no problem and then clean cut.... I then had to switch her off and restart. Fault then cleared. If you drove her easy no problem but once the boost was up she cut .....

Watch the boost guage and note where she cuts at. There is a safey cut out on the management at about 2bar boost.....!

My wategate was not operating and I changed it out.... No use.. Discovered it was the 3way valve on top of the engine the "boost pressure control valve" had a broken port ... This was an age related failure of the plastic......! If the wastegate does not operate try putting a guage in line of the pipe which feeds the wastegate. Put the guage under the wiper so you can see it....Drive her on a good boost . If there is a reading then the waste gate is stuck if not then its the boost pressure control system. Another age related problem is the recirculation valve on the bottom left of the engine bay. Pull the pipe off and suck .. If there is resistance then its fine.

Try that for a long shot.............![]

 

[Guest]

Sorry lads
Didnt see that it was an S2 you were driving.........! Thought it was a Turbo..... Just disregard any thing I have suggested .....!

Star Numpty Prize goes to me[&:][&:][&:][8|][8|][8|][8|]

 

[RC18B 911 turbo]

Anyways thanks for the helps from everyone and the entertainment from Fen and Peanut just got a new DME relay so I'll try that, if it isn't that then we know to try something else.

 

[peanut]

entertainment is our business lol [][]


nice post about the Turbo ! [] maybe we should add to the archive though cos its sure to help somebody with a turbo someday

 

[Fen]

ORIGINAL: peanut

no need to be rude Fen just because someone doesn't agree with you if you can't make a reasoned argument to make a point then I suggest you don't reply . Being offensive does you no credit at all and isn't welcome on this or any forum

I don't give a damn whether people agree with me or not. What I really took exception to was being accused me by name of only joining a thread to criticise others when in fact I was first to respond with a suggestion to the original poster.

However I see you already posted a short apology that I missed this morning, probably as I was already typing my reply as I certainly didn't see it before submitting my last post in this thread, so as far as I am concerned we're all good - difference of opinion is what makes the forum an interesting place to be. I know I come across as an arrogant tw@t, but that's because I am an arrogant tw@t so I'm not going to apologise for that.

 

[pauljmcnulty]

I know I come across as an arrogant tw@t, but that's because I am an arrogant tw@t so I'm not going to apologise for that.

Good to see you back, Fen...[][][][][][]