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hot start probs 944

ORIGINAL: northo

I am having similar problems with my 91 S2. Have had all connections etc checked and they seem to be fine. Car was running fine after the check, but has since once, and only once, not restarted when hot. Definately not the battery, as it is new, and the car has just been serviced, so I don't think it is the fuel filter. Very frustratiing and wierd.

Someone has suggested that I get a new DME relay. Coyuld that be the problem?
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If it turns over at normal speed then I would suspect the temp sensor on the head to have failed, or for fuel to be draining out of the fuel rail the remainder evaporating and causing a 'air' lock

If it turns over slowly when hot, starter heat shield, earth or power cable with hot oil soaking into it

Dme relay always worth a shot - a spare in the glovebox is always worthwhile.

Tony
 
ORIGINAL: pjb
Battery reading is 13, on voltmeter.
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Sounds low, but I never trust the in-dash voltmeter in mine (too much wire going to it, therefore too much opportunity to lose a volt or two.)

Usually it's a connection that gets worse when hot - less of an issue with wires themselves. Having said that, if you can see something that looks iffy then fit it pronto!

I think you need to systematically trace the problem. Don't stab in the dark. Check the connections from battery to body, block to body, battery to starter. Take them all off, clean them all up with sandpaper, bolt them all back on again. Then do the same with the connections to the coil.

I would put a pint of beer on this solving your problem, if done properly.


Oli.
 
ok for the pint them !

DAMN it. Im going round in circles...

Now something came to my mind, when i turn the put the ingnition key, and turn it a go, the big fat red relay (fernsterherber : power window `) and an other relay that said radio, that one is black make a noise like if they were ready to power the olympics: sounds like a power crunch kind of sound, hard to decribe ...

i wonder if that is mormal ...[:'(]

car was warmish this afternoon, drove 5 miles did the recycling, didn't restart ... a guy jump started me with leads, obviosuly, started first go... got home, car still hot... turned it off, back on ( after waiting for fan to go off to ensure the fan isnt draining the battery ) started fine...

as Northi says: very very ... frustrating. Just went to start iot to check: sounded like a brand new motor...[:mad:]
 
i meant.. Normal

I fixed that wire... the bare one. No changes, but at least it's done.

( do u guys have like MILLIONS of wires under the glove box ? )
the moron that owned the car previously has made a right mess ( including removing hatch switch under steering wheel etc )

pjb

 
ORIGINAL: pjb
drove 5 miles did the recycling, didn't restart ... a guy jump started me with leads, obviosuly, started first go...
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Two things.

1. Well done on the recycling. The planet will love you for it.

2. If it didn't start on it's own, but did start with some jump leads, I'd be suspecting something battery-related. So, check battery connections, battery-to-chassis and block-to-chassis.

Where did you hook the jump start leads on? Straight to the battery, or to the Porsche-Approved post under the bonnet?


Oli.
 


Hi oli

thanks for ur help again

well, we connected the jump leads directly onto my battery ( u know on the connectors )

Obviously started straight away...Drove home. parked the car, turned it off, waited for fan to finish, turned it back on, again no problem:

felt like jump starting it acted as a little recharge..

I think I asked u this b4 : Could temperature have an effect on a maybe kind of worn out battery...?
( the battery has enough watrer in it, all checked )

Im at the point where Im gonna go and buy a new battery, first i'll drive tomorrow all day with an other car's battery I have.

Ps: i went on some french forums and two solutions are most common: 1/ Cleaning the starter and eventually rebuilding it if necessary
2/ new battery
 

regarding recycling: i feel bad enough driving a 2.5 L... [8|] ( could b worse, could be a silly cayenne )

pjb [:)]
 
ORIGINAL: zcacogp

Where did you hook the jump start leads on? Straight to the battery, or to the Porsche-Approved post under the bonnet?
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Early dash cars (and all LHD) have the battery in the scuttle so don't need the post which is primarily for opening the boot with no power on the car.

This carbon footprint stuff is easy - I don't take a plastic lid with my coffee at work any more I just walk carefully back to my desk. That way I hug enough trees to drive a 4.2 V8 twin turbo estate car [:D]

On a more serious (OT) note my 80TDI has to be a lot more planet friendly than buying a new Prius...
 
ORIGINAL: pjb
we connected the jump leads directly onto my battery ( u know on the connectors )

Obviously started straight away...Drove home. parked the car, turned it off, waited for fan to finish, turned it back on, again no problem:

I think I asked u this b4 : Could temperature have an effect on a maybe kind of worn out battery...?
( the battery has enough watrer in it, all checked )

Im at the point where Im gonna go and buy a new battery, first i'll drive tomorrow all day with an other car's battery I have.

Ps: i went on some french forums and two solutions are most common: 1/ Cleaning the starter and eventually rebuilding it if necessary
2/ new battery
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PJB,

Increases in temperature has two effects on a car's electrics.

1. It increases the reistance of connections and wires. This makes electrics work less well.

2. It makes batteries work better. This is why cars start less well on cold mornings - the batteries are boxes of chemicals which react to produce an eletro-potential difference - usually called a voltage. This reaction works better when it is warmer. Cool the battery down, the reaction works less well, less voltage, hey presto your car doesn't start.

You have a problem with the car electrics working less well when it is hot. I'd be looking at those connections! A new battery may appear to cure your problem by offering more welly to overcome poor connections, but this is akin to overcoming the problems of binding brakes by fitting a larger engine. (Jump starting the car from another car may well have provided enough oomph to overcome those bad connections as well.)

By all means try fitting another battery; it may well offer a quick and easy solution, but by doing so you are treating the symptoms, not the problem.

Just my $0.02's worth.

Fen - didn't know that the post under the bonnet was for boot opening, or that LHD cars had batteries in the scuttle. Does this mean that jump starting to (or from) the post is a bad idea? (I.E. Does it have under-sized wires going to and from it?) I did once jump-start the car using it; did I do the wrong thing?

Oli.
 
Pass - I have never used it at all.

I use the one on my BMW for letting me open the boot when I forget I have the battery disconnected and close it (3 times I think I've done that) or for trickle charging if I have run the battery down by having the doors open for a long time (why doesn't it turn the lights off after a while? In fact why doesn't it use one of its multitude of light sensors to tell the lights it's daylight and not to come on at all?).

I didn't even know the 944 had one for ages and by that time I had been in the back on my belly pulling cables several times and since then I have not needed to use it and now have a manual hatch anyway. Does it look beefy enough for the jump start power or does it look weedy?
 
well today is the day I will drive all day with a different battery .... if the problem persists, well i won't be impressed...
If the problem stops I will be overwhelmed and will take the challenge of : driving all the way to Toulon, south of France in the car...

Now that will be an adventure, more than paris dakar... trust me... or I might not have the guts to do it... its a 1000 km run from Calais to Toulon so ... well batttery first, challenge next...


pjb

 
ORIGINAL: Fen
Does it look beefy enough for the jump start power or does it look weedy?
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Looks pretty beefy, to be honest. And seems to be plumbed into a fairly hefty bit of cable ... hence no reservations when I used it.

However, maybe I ought to play safe and go for the battery terminals next time.


Oli.
 

Guys

I've looked in all sort of books. What is the swicth just in front of the battery enclosure, when you are looking at the engine from the front, it's a switch that seems to operate with the bonnet closing...


thanks for your help.

still sorting that hot start prob, troubleshooting goin well.

pjb
 
Is that so? Whereabout is it located, Fen? My light did work and now it doesn't but I disturbed the plunger switch when installing my HID lights so I assumed I'd damaged it. Perhaps it was just coincidence.
 
It's all in a unit with the bulb holder. Note it only comes on if the bonnet is open and the lights are on at least to position 1.
 
Now how stupid do I feel.... [:)]

(Of course I had the lights switched on when fitting my HID kit. Just been to the car park to look and it works as you describe...)

My car does have a plunger switch though that looks OEM - perhaps part of the 'official' Porsche alarm which my car also has?
 
Yes, the alarm has a plunger. Possibly the early ones had one for the alarm with the key hole in the rear wing also and that's what pjb is seeing.
 
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