And take a deep breath and slowly release....

[Black Beauty]

So, after her mis-firing episode in March (see post in Mid March) I thought I'd let her know who's boss and haven't driven her since. []

Having had what I thought was an epiphany as to what the mis-fire problem was I thought I'd take her for a spin, but she thought different. []

She turned over, started instantaneously, that'll be the new plugs etc and was ticking over nicely - then she died. So, I restarted her and she fired first time and then after 5 seconds or so she died again. Strange, I thought. So again re-started and she died again after 5 seconds or so. Repeat to fade. And yes she has a half a tank [8D].

If I let her lie long enough, she would re-start and last for approx 10-20 seconds, but as soon as I pressed the accelerator she died!

So I'm now more than a little bemused, is it fuel or is it something else? If its the fuel pump, surely it uses up the fuel and it wouldn't re-start.

I spoke to GT 1 in Chertsey last week to find the cost of them doing the belts and fixing a few minor things and now I can't get her there!! BTW, I was very impressed with them, especially their honesty.

Its so ironic really, she has only done 60k, and passed the MOT with no referrals in Feb, so I decided to change plugs, air filter and HT leads and she does this to me.

As Nick said a week or so back, these come to try us!!!!

Thoughts anyone

Spence

 

[mik_ok]

Sounds like fuel starvation.

Do you have an in-line fuel filter?

 

[sawood12]

Join the RAC or AA and get the chap out to your car. That's what I did when I couldn't track down an intermittent starting issue. The chap from the RAC diagnosed it in a matter of minutes.

 

[homesea]

ORIGINAL: Black Beauty

so I decided to change plugs, air filter and HT leads and she does this to me.

Plug leads on the right way? Could you have knocked a hose off so un-metered air getting in to the manifold? or the AFM/throttle plug?

Air filter in wrong so blocking air flow some how?

Start with the basics.

 

[Black Beauty]

Mik_ok - its the standard fuel filter. A new one installed 4 years or approx 9k ago.

Scott - I have RAC cover but its not homestart as I didn't think I'd need it w/ 3 cars![]

Tom - I have checked most things, at least twice, but it could be air starvation I suppose! I'll check the AFM again.

 

[zcacogp]

ORIGINAL: homesea

Start with the basics.

Can't agree more. Is it getting air in?

Is it getting fuel in?

Is it continuing to spark?

CHECK everything - assume nothing. So check for pressure on the fuel rail. Check there is a spark by pulling a plug out. Check the air flow by removing everything up to the AFM.

If you do all this and can't find the problem then ... well, do something else!


Oli.

 

[944 man]

Dist.cap, rotor arm, fuel filter and DME relay for starters. I had exactly the same problem with my 944 last year.

 

[germanmetal]

I had the same issues,i found out that the throttle position sensor had failed(just under the throttle body).Disconnect it and see if that helps.if it does then test/clean and setup or renew then setup.

 

[944 man]

Does it die cleanly or is it woolly for a short while first?

 

[Black Beauty]

944 man - It starts perfectly, not lumpy, or mis-firing , just gently dies. However since its only running for 10 secs or so, or longer if I leave 10 mins between each restart, is it really fuel stavation? If it is why would there be more fuel available to allow it to restart?

Unfortunately, I didn't have a chance to check if the fuel pump is working properly this weekend, but have a day off on Friday so will check it then, along with the pressure in the rail. Just a quick question, if I have a fault with the DME, AFM etc will it inhibit my ability to check the operation of the fuel pump.

(DME is a new one, but swapped it with another the previous one which I thought was the cause of the previous mis-firing and still the same issue)

I took the AFM apart the other week and checked the voltages etc as per the Clarks guidelines and that seemed perfect, and I suppose because of the low mileage the tracks were virtually non-existant. The one thing which is nagging me now though, is did I put it together properly afterwards, however all I did was take the black cover off and then reseal it.

 

[944 man]

I cant help any further, mine died after running poorly. Now my 924S has started to play up in exactly the same manner, so I'll be taking my own advice.

 

[Black Beauty]

Thanks anyway. I'm just going to have to be methodical, and not rule out anything.

Germanmetal - thanks this was something else I am going to check on Friday.

S