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Help, you wouldn't believe it.......

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Paul190H

Member
Having just spent a bit of time this morning putting up photos and extolling the virtues of my S2, she rewards me by not starting!

Got it out this morning to check water, topped it up ran it for 5 minutes and then turned it off. Went out to get to a site meeting and will not start.

Seem to have fuel when I crack the fuel line connection to the rail but a very weak spark.

Advice would sure be appreciated.
TIA
Paul.
 
You could do worse than t follow the 'no start checklist' located here:

http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/484996-let-start-no-start-checklist.html

Cheers
Mick
 
Thanks, have tried the ones I can, power to the coil, pump runs if I jumper the DME relay, plugs seem quite wet when I took them out and I have a good spark at the plugs. I do have a intermittent clicking from a rely that is in position 6 marked spare, does anyone now what this relay is?
 
Rear defrost relay?

http://www.944online.com/cgi-bin/ASI_Store.cgi?Product+diakey_10002+9441+EngineElectrical-9441

I'd be lost without Google [:D]

Cheers
Mick
 
Thanks again Mick, a fruitless afternoon though. A very helpful chap at JMG suggested it may be the ecu, not unusual to burn out a resistor. They will pop mine in one of their cars and see if it is faulty.

Will pop down there tomorrow, fingers crossed.
Cheers
Paul.
 
Sorry to hear of your misfortune Paul,

From what you say I'm thinking immobiliser / alarm system. My car takes the head staggers where the alarm relay operates for about 30 seconds after attempting to start. I have the alarm horn removed. I have a spare alarm unit which I install and hey presto. Germans are rubbish at electrical.

you have fuel, you have a spark, very strange.

good luck, keep us posted.
George
944t
 
Does it sound like it has compression when it is turning over? I am wondering whether it could be flooded.

How did you check the spark at the plug? At the HT leads where the plugs would go in or the king lead? If the plugs are soaked in fuel I would attempt to clean them up or chuck in some new ones.
 
Not wanting to look for a complicated answer if there might be a simple one, when was the DME relay last changed?

It' a rare failure now, as most have been replaced, but still worth a thought. Assuming you've not done the bypass detailed in Clarks, and eliminated it already.
 
My turbo had similar issues, and i went far too deep checking crank sensors, ECU's and more, turned out to be the centre pin on the distributor cap with some slight corrosion but obviously enough to give high resistance.
New cap, rotor arm, and plugs and it starts on the button [;)]
 
Thanks chaps, JMG think it could be ECU. Compression should be fine as it had cylinder head rebuild a year ago along with belts and timing chain Etc. DME was changed two months ago following another power failure which turned out to be earth strap. To be honest, disi cap and rotor arm could probably do with replacing but I don't think it's at fault here. Plug gaps are good and seem to spark well.

Off to JMG tomorrow with ECU so will keep you posted.
Cheers
Paul.
 
Before it goes to JMG I would see whether it starts with an injector lead disconnected. If so it could be a fuel pressure regulator issue.
 
Thanks fella, took the ECU to JMG and it's fine. Then took all the plugs out which were pretty wet, let the fuel evaporate and then pulled the fuel pump fuse. Put the clean dry plugs back in and the car fired very briefly, looks like it could be overfueling. New regulating valve now on order, hopefully will sort it out on Saturday.

Will keep you posted
 
Fingers crossed,btw,the pics of your car really made me want an S2!Had a brief look on PH and wow they are creeping up in value like turbos(which I have been watching more closely up to now)...
That's good news .Hope it's the FPR.[:)]
 
Absolutely love my S2, it's my everyday driver now. John at JMG was really helpful and can really reccomend them, will get it in there for a service later in November and will get the cam timing checked as well.

There's been a lot of talk about which ones to buy, I paid £1500 for mine 2 1/2 years ago and probably spent £3.5 on it and it's now a great car and I know what work has been done and the standard it has been done to.

FPR comes in tomorrow so hopefully be running again then
Cheers
Paul.

ORIGINAL: MarkK

Fingers crossed,btw,the pics of your car really made me want an S2!Had a brief look on PH and wow they are creeping up in value like turbos(which I have been watching more closely up to now)...
That's good news .Hope it's the FPR.[:)]
Click to expand...
 
You are absolutely sure the fuel pump is running when you're cranking it?

Worth checking the timing marks are still aligned if you have fuel and spark.
 
I had a similar problem and it was the king lead occasionally earthing on the head light mechanism. The king lead looked perfect
 
Thanks for the advice guys, fitted a new pressure regulator valve, dried the plugs and away she went. Mental note to refresh electrical items for the winter, especially plug leads as they look a bit tired.
John from JMG was really helpful on the phone and testing the ECU so will be using them in the future.

Cheers
Paul.
 
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