poorly porsche

[cjhaz69]

just wondered if enyone could shed anylight on this problem.just started the car(2003/996) and it sounds rough but i noticed it was low on fuel and thought it might have got some crap in it so i tip toed 300 yrds to the garage put £20 of fuel in and its still the same but i noticed the fuel guage and miles left to go had remained exactly the same!! if you know what it is do you also know where i should send it to be fixed?(manchester area
many thanks in anticipation
chris

[Ballcock]

Wrt the fuel , i think that it won't register unless you fill it more than half full. Normally what happens is that the sensor only works to half empty and then the computer kicks in to estimate range..

Can't help on the other issue I'm afraid ...

[cjhaz69]

what do you mean by "wrt the fuel"?? sorry for my ignorance

[flatfour]

wrt = with regards to....

[cjhaz69]

im no good with this text speak, or diagnosing car problems!!

[aardvark]

Have heard Hartech in Bolton are top notch.

[Ballcock]

aardvark said:

Have heard Hartech in Bolton are top notch.

They're the ones to look up!

The lumpy idle could be any of a number of fairly small glitches , no.1 among them , the mass air sensor which costs around £100 and is an easy fit.
So don't despair just yet.
If you could go into more detail on the problem maybe some of our resident experts could advise better ...

[cjhaz69]

to be a little more precise,it actually idles ok ish but when i press the accelerator it sort of misfires and sounds a bit like a diesel and has no power what so ever, hope this sheds a little more light on it ,thanks for the help

[richardb.jones]

ignition coils ... ?

Known to crack / fail - you'll need to replace all 6 as they are all likely on the way out ...

[Dreammeister]

Check your oil - mine was exactly like this after a long run... I filled up the oil and it was fine..

Check it using the dipstick rather than relying on the computer sensor...

[LeeME3]

The bit about having to full up a certain amount before it registers is true - it's an intentional design feature although I can't for the life of me think what purpose it serves.

As for the rough running, another vote for Hartech.

[etlprws]

I thought I had read somewhere that it was only RHD cars that had the crazy fuel gauge. Something to do with the tank position.

I can't believe it is beyond the wit of man (or Porsche) to find a way of getting the level sensor to work to the bottom of the tank!

[Erik997]

Sounds exactly the same as my 997 a few weeks ago.

No fluid leak, all temps/pressures ok, car starts but sounds rough and misfiring - bad vibration as well. Sound about right?

If so, I'd say your coil pack has cracked as someone has already said. Mine was covered under warranty as is a known fault.

All the best.

[fieldl]

Mike at Sports and Classic are well recommended if you are looking for someone in South Manchester.
www.sportsandclassic.com based in Mobberley.

[cjhaz69]

thanks for all the advice, i climbed under the back of the car tonight and i think i have found a crack/split in the right hand side exhaust,does this sound like it could be causing this as there are no lights on on the dash to indicate anything else
cheers

[richardb.jones]

cjhaz69 said:

thanks for all the advice, i climbed under the back of the car tonight and i think i have found a crack/split in the right hand side exhaust,does this sound like it could be causing this as there are no lights on on the dash to indicate anything else
cheers

.. depends where the split is - if it's pre cat or inbetween the cat and backbox, then this will cause the sensors to run the car rich, if after the last sensor, then it will have no impact at all ...

If you have no CEL light on the dash - then either the coil or above split is unlikely as the engine management will report it.