urgent help needed, boxster wont start

[grubby66]

Hi guys. im currently trying to find a fault on 2003 boxster s. it used to drive perfectly then suddenly cut out, the relays start clicking =, fuel pump stops and so does the e=ngine, i have checked it for d.t.c`s and no trouble codes stored. the engine management light doesnt come on when it cuts out. at present the car will not even turn over, fuel pump doesnt kik in when ignition turned on. then all of a sudden it will start and run fine then suddenly ct out again. any ideas?????

[Ray Luxury-Yacht]

Battery terminal connections?

[spikeyhead]

Ray Luxury-Yacht said:

Battery terminal connections?

I'd guess if they've checked stored code then that's already been checked.

Is there an engine earth strap on these?

[Cunny DK]

Have a feel under the passenger seat and see if its damp/wet. The Control unit for the alarm system is under there, when they get damp they corrode and cause problems like this. If it is damp check the forward most roof control arm. They have a tendancy to snap and punture the membrane in the rear and allow water into the cabin. Hope this helps

[grubby66]

Hi. thanks for the replies this job really is getting to me now. ive been through all battery conections, water ingress into alarm modules (dry as a bone and no signs of any water ingress in vehicle at all) Ive been through the car and cleaned all 9 earth points. still no joy... HELP

Im now looking at or clutching at straws maybe the power feeds into vehicle. ive traced the main power lead into the car from the battery as there is only one but there must be a junction box or t off from this lead somewhere but cant find it? any ideas?

Edited by grubby66 on Monday 11th May 12:18

[grubby66]

hi again. i now have the car running after changing the dme and the starter relays. it was ticking over nicely for an hour tonight and thought i had cracked it so started putting it all back together. just as i finnished it bloody cut out again. i now feel i have a power up relay fault if it has one. or i need to find where the power comes from into the car. such as ignition feeds? i can only trace one main battery lead that comes from the battery, through the bulk head, under the centre console through to the firewall. so where does the interior cars main feed come from?????

[18speed]

See if this helps

http://www.youtube.com/watch?v=cY1YndLmbXQ

[grubby66]

lmao.
Do they do a bottle of wynn`s keep running ya b@st'rd .....lmfao.
I wil buy 3 bottles, just get me a price...lol.

But on a serious note, where the hell does the boxster get its internal positive power from?

[Cunny DK]

I think all the relays relating to the DME are in the relay carrier in the boot on the left hand side behind the carpet trim. If you remove the engine top cover there is a (+) joining point next to the power steering reservoir. If it just cuts out It might not be a relay. Fuel pumps can go faulty and intermittently play up until they fail. Not sure if this helps at all. You may have 2 problems ?

[grubby66]

Hi. i have spoken to a local porsche dealer and they tell me they have come accross the same problem with a identical vehicle and had to fit an ecu at nearly £2000. oops.
Well ive put it back together now and given up.
And guess what.
It wont even bloody turn over now unless i leave the ignition on for 15 mins first the you hear all the enging components burst into life, ya turn the key and it starts and runs perfectly.
im at a loss as to what to do with it.

[melv]

Bite the bullet and get it taken to a specialist!!

Are you far from GCR in Leicester???

[lightweight]

This may sound bizare but i had a simmilar issue with my C4S it turns out it was the ignition switch was intermitantly faulty and once the barrel was swaped out all was good.

on my car first sign of trouble was aircon faliure! go figure.

Edited by lightweight on Wednesday 13th May 09:44

[grubby66]

Well the suns out and i still cant use the bloody car.
Its been starting perfectly for the last 2 weeks showing no faults at all so i decided to venture out the drive with it and go on a 1mile, then back then a 3 mile and she ran perfectly,,,
Until i decided to venture that little further, about 8 miles then it suddenly cut out and wouldnt even crank over.
Left it for 20 minuites and it started, got me home and now am back to square one.
at the moment it is starting and running as good as gold.
I still need help.

Edited by grubby66 on Monday 1st June 22:10

[thegoose]

I'd get it plugged into a PIWIS (genuine Porsche dealer tool) tester before wating anymore time on it. It's kind of like a big laptop so you may be able to persuade a Porsche specialist with one to bring it out to you. It will report any faults with alarm modules, ignition circuits and all sorts of other stuff - be well worth seeing what comes up.

[Cazza986]

Im having same problem with my 1999 Boxster. Poor starting then when it fires up runs lovely then out the blue cuts out. Restarts then fine again. Im thinking this is deffo a fuel fault either fuel pump acting up or even the cat ? Its bloody annoying thats for sure

[996Targa]

We had a similar problem with our Boxster, car would run fine then lose power and cut out. Park, start, repeat.

After a lot of fiddling it was the fuel pump relay, about £14. I bought a spare for our 996.

[Bullet-Proof_Biscuit]

Sounds a bit like crank position sensor failure. They fail when they get hot, so manifest as a cut out after a few miles issue, and/or will not hot restart. That would I assume log a code though. Only £60 part mind.

[gordmac]

Another for crank position sensor.