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Will not Start

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Keith D

New member
Hi, Help please as to what to look for, 944 S2 running fine, but after filling upwith fuel (to beat the duty rise) car drove well but the following morning will not start. Good spark at the plug, and all fuses are good, she turns over well but refuses to start.

What should I look at next ? Fuel filter ? and if any one could point to how to check if fuel is getting to the right place ..
Keith.
 
Hi Keith,

I've moved this to the main 944 forum. At the risk of stating the obvious, have you tried the DME relay?
 
Thanks for the move.

Humm DME relay, I guess thats in the fuse box area ? any help as how to check it would be great, I do have a test meter.

Kind regards
Keith
 
If there is good spark at the plugs then surely the DME must be grounding the coil and hence the relay must be OK. One would also the presume that the flywheel speed sensor is OK. What is anyone's view on the flywheel reference sensor?
 
Having had a flywheel sensor fail in the past its the first thing I check along with the DME.

Have to say though that normally a reference sensor will slowly give up, normally noticed by the starting when cold then refusing to once warm, but they can fail instantly on occasion.
Look at the Clarks garage pages they have the resistance test on there to check if its the sonsors are OK
 
Thinking again now though back to my original post. Surely if spark is there and is good everything is there to make it start??? I am starting to lean towards fuel. I would first check for fuel pump running. If you bypass the DME with a jumper you should be able to hear the fuel pump running at the fuel rail (without the engine started of course). DME jumper is as follows. The following is a direct copy and paste from Clark's website:

If you suspect the DME relay is bad and you need to move the car, you may install do so by installing an "emergency" jumper across terminals 30, 87, and 87b on the relay / fuse panel. Some folks will tell you to jumper terminals 86, 87, and 87b instead. This allows you to only run the fuel pump, DME, and injectors when the ignition switch is turned on. Seems like a great idea on the surface. However, realize that the wire supplying power from the ignition switch to terminal 86 on the DME relay is a 1.0 mm wire and is only intended to carry enough current to pickup the primary coil on the relay. The wire connected to terminal 30 is a 4.0 mm wire which is designed to carry full current demanded by the fuel pump, DME, and fuel injectors. I strongly recommend using terminal 30 instead of terminal 86 to supply power via the jumper.
 
Good point Rob, if there is a spark then its not the ref. sensor, suspect you could be right with the pump not kicking in
 
Don't want to point out the obvious, but given that it was just after you filled up, you didn't put diesel in by accident did you?
 
Hey you guy's Thanks for all your advice.
Got home from work arround 5.30 to try and get the little gem started, but nothing other than a lively engine turn over, and good spark at the plug. So With the DME thought to be the culprit I checked the fuse No. 7 tested ok, but as I had a spare I replaced it, then removed the DME relay gave it a little tap and a shake.

Got back into the drivers seat turned her over and she sprang into life.
So thanks again for pointing me in the correct direction, but do you advise the changing of the DME relay ? or could it just have been a bad connection?

Kind regards

Keith.

PS It was my wife that went to fill her up, and like you the question was did you put DIESAL in, (don't think she slept last night thinking about it )
 
The DME relay is actually two relays in one mate. Internally the smaller of the two relays does two things. It provides 12v feed to the DME (computer) and it also energises a larger relay to run the fuel pump. What has/is happening is that the smaller DME relay is fine and is energising the DME, which in turn is allowing spark to the plugs. The larger of the two relays has been failing to energise and therefore the fuel pump was not running. I recommend that you purchase a new relay soonest mate. You can get of the interweb for £20+. In the meantime I would make up a three way jumper as described in www.clarks-garage.com garage shop manual fuel 05 emergency repairs. If you ever use it though please heed the warning on the site and remove after you have finished using the car as it will permanently run the fuel pump and energise the DME even when the car is not running. Anyway glad to hear you are sorted [:)]
 
It's been a while since this has come up, hence my slightly reluctant hint toward the relay. For those of us who've been around the cars for some years it's a given that you carry a spare DME relay in the glovebox. One day you might need it, or you could well come across a 944 at the side of the road needing one.

A timely reminder to all that it's worth getting a spare and keeping it with you. Hope it's the solution for you, Keith.
 
Again thank's for all your help.
Will get a DME on order (This will be like a Delia Smith recipe when she suggestst caroway seeds in a dish. hehe) high demand.

Kind regards
Keith.
 
hi everyone this is keiths wife Trish. Oh yes i bet you all are rolling in the isle at the prospect of me putting deisel into my beloved 944 s2. My i point out that SHE IS MY PRIDE AND JOY. NO way can you accidentally put deisel into a petrol engine (COZ THE NOZLE DONT FIT) .
Keith only gets to drive her on MY say so SO NER!
 
hi everyone this is keiths wife Trish. Oh yes i bet you all are rolling in the isle at the prospect of me putting deisel into my beloved 944 s2. My i point out that SHE IS MY PRIDE AND JOY. NO way can you accidentally put deisel into a petrol engine (COZ THE NOZLE DONT FIT) .
Keith only gets to drive her on MY say so SO NER!
Click to expand...

[:D][:D][:D][:D]

Welcome to the forum, Trish! We never doubted you, it was all Keith's idea. Honestly. [;)]
 
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