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996 starting problems! Help!!

liam996

liam996

New member
I have had my 2002, 996 Carrera 4 for about a year now, not had any problems with the car at all, on Friday evening i travelled home from work as normal and parked the car in the drive. When going to use the car on Saturday morning it wouldn't start! The ignition key turns and it tries to fire up but once you let the key go it cuts out, even when applying the gas.

Anyone got any ideas that may help me sort this problem out. Many thanks.
 
I noted Richard saying the ignition barrels can break up inside in another thread. I'm sure he'll be along in a minute but do you have a bunch of heavy keyrings on your keyfob? That is the normal cause for a failing ignition barel as they swing about as you drive.
 
Thanks, i do have fairly heavy keys on the fob! Something so small can cause that? I guess its a case of changing the barrel and see if that solves it! Otherwise could it be anything else? Many thanks
 
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Liam!

Is it cranking at normal speed? If so, it might not be the ignition switch.

In the four years (or so) I owned my C2 I had a similar issue on two occasions, years apart, when it was like the engine had flooded. I had to crank it for ages before it would catch enough to continue running (or rather spluttering), and then it slowly cleared after about 15-20 seconds and burst into normal life. It didn't throw up any fault codes, nor did I ever find what was wrong. I recall just cranking it with a half-open throttle until it caught.

Not much help, is it?
 
Thank you Richard.

I basically turn the key, it fires, splutters like it is going to fire up and then dies! And will not go past that stage. [:mad:]

It does not show any faults when run through the test.
 
Check the fuel pump is pumping the correct pressure. Had similar problem with my C2 a year ago and it proved to be a clogged fuel pump. New one fitted at OPC under warranty. Problem sorted.
 
Replaced the ignition switch, wasn't that! [:mad:] Fuel pump checked and seems fine, so probably not that [:mad:] No faults being shown on diagnosic test [:mad:]

Had all new coils fitted 2 mths ago, as the previous ones had cracked.

This all started when i had driven the car fairly hard on the way home and parked up. Then the next morning started having this problem.
 
Where can i find the fuel relay on the 996 C4? I can't find any data to show me which one of the relays it is! Can anyone point me in the right direction please?
 
The fuel pump relay is in position 13 on the relay board in the driver's footwell, above the fuse box.

When you say 'checked fuel pump', can you hear it running constantly? When you turn the ignition on, you should hear it for a couple of seconds, and then it should go silent, as it is up to pressure.

Was there any work done on the car in the preceeding 200 miles, which might have involved disconnecting the battery? If so, it might be that you have simply run out of fuel. Being a C4, if the battery is disconnected when it has less than 19 litres of fuel in the tank, when it is reconnected it will read higher than the actual fuel level. That being the case, try adding 5 litres of fuel.

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Thanks Richard.

The fuel pump does make a noise for a couple of seconds then goes silent, so not going constantly.

The vehicle was filled with fuel a couple of days before it packed in and is registering over half a tank now. Also you can hear the fuel splashing about, was the first thing i ckecked so as not to make myself look a complete loon [:)]
 
Made a decision today, replaced fuel pump, ignition switch, fuel pump relay, still the same, won't start. So my love affair with Porsche is over and the car will be traded in for as much as they will give me. Had enough.
 
It hasnt taken much to put you off has it? Have you tried disconnecting the battery for a couple of mins with the key on the ignition setting (1st click before its turns over) it might reset any settings that are wrong.
 
It can be very annoying when a problem can't be solved but you need it working before you sell it unless you want to waste money, take it to a good specialist and I am sure the problem will be solved it could very simple.

Good luck either way PJ
 
Chris, 2 weeks without a car has put me off!! I have tried everything people suggested and still nothing, battery has been disconnected today as was dead, new battery fitted and still nothing!

Philippe i agree but seems like i am throwing good money after bad. The vehicle has been looked at by a good independant and he has given up as tried all he can, only option would be main dealer and can see that costing a small fortune that i dont have at the moment.

Other suggestions are it could be the alarm/imb but have a feeling Porsche would have a field day with my bank account.
 
Find another indy. If it was the immobiliser, it wouldn't crank, the fuel pump wouldn't run, and there would be no spark at all.
 
Thats what i thought Richard, clutching at straws at the moment. Its pushing fuel through i can smell it after cranking for a while, but just doesnt want to give it that extra to start, its so frustrating!
 
If i take the fuel pump relay out it still does exactly the same as it does with it in position! Replaced it with a new one and makes no difference, does that sound right?
 
Telling me it's odd [:(]

Just got it checked for faults again as i wasn't totally convinced by the first lot i was given, none!!!

Codes showing are:

P0103+ Mass air A circuit high input
P0223+ Throttle position sensor B high
P1120 ?? Cant read his writing
P1138+ " " " " " " " " "
P1190+ (could be P1140+, can't read his writing!)
P2135+ Throttle position sensor switch A/B

Anyone have any idea what my next step is? Or where the throttle position switch is located?
 
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