Menu toggle

help please

Guest

Guest

New member
hello everyone. i have just bought a new car, a s2 cab 1990 42K miles (new pic to come) and i just done about 400 miles in the past 4 days, i love it. such a better car than my lux. But i have a problem, when i started the car up this morning it is missing on its 1st cylinder, so i took out the plug and there is nothing wrong with the plug or the leads, so i checked them all and they all work, could it be an injector or some thing else?? can your cylinders get blocked?? all the help please. thanks Oli
 
yes its the same and i have event tryed to swap it around with one of the other spark plugs. strange isnt it??
 
Have you tried turning the engine over with that plug unscrewed?

If the injector is working at all you should get petrol in the cylinder.
 
yes there is definatly something in there because when i took at the spark plug it smoked out of the cylinder so i guess there is something in there????? i dont know
 
is there any way of testing if this is the case, as i know my porsche garage will charge me about 100 quid just for looking at it???
 
Not sure how the 3 litre engine differs from the 2.5 in this area but on the 2.5 the rotor arm can work loose and rotate - but that should afect all cylinders - How did you identify the number 1?

The rotor arm can also crack near the tip allowing the metal end to flop about.

The cap could be damp or cracked inside a crack will isially show as a white trace where the spack is tracking.

If the ignition leads are original they will probably 'leak' easiest way to spot the leaks is open the bonnet at night I couldn't believe how badly mine were leaking and the car still ran - repositioning them may help (switch of the ignition first) until you replace them. Very pretty though like a fireworks display [;)]

Injectors can have problems but it is unusuall, though in the US they have reported broken wires.

If you have a multi meter check the resistance of the plug cap - they unscrew from the lead (so substitution would also work), on my lux one went bad giving me a misfire IIRC £8 from an OPC.

If it was a spark issue I would expect a wet plug though so could be injectors / fuel pump (assuming plug was removed just after running).

A good specialist should be able to identify the problem relatively quickly so £50 of labour is probably nearer the mark.

Google search for 'Clarks garage' for more advice

Good Luck,
Tony
 
hello i have just started up the car and when cold it runs fine its only when the car gets hot that it starts to miss also there is alot of steam coming out the exhaust when cold i dont know if thats related or its because of the CAT??
 
The exhausts can generate a lot of steam when cold - IIRC there is an issue with a temp sensor (near the front of the head?) causing a misfire on the S2 engines - hopeully that will jog the memory o one o the 16V owners cos I can't remember the exact details,
Tony
 
Aha - Now that Tony mentions it I have had this problem on my S2 [8|]. My engine temperature sensor failed fooling the ECU into thinking the car was always cold and consequently pumped loads of fuel through the injectors. Car ran fine when cold but once warm would hesitate on acceleration and pump clouds of black smoke out the exhaust because it was running so rich.

The workshop manual has a section for testing this sensor to see if it is within tolerance, unfortunately I can't get to my copy until the weekend. I also have the part number at home and from memory it was around £30
 
does anyone think it could be the cylinder head leaking a small amount of water into the cylinder?? i cant see any oil in the water or water in the oil but could it be possable, i hope its just a falty sensor???
 
Head gasket failure can cause a misfire when cold then it goes away when hot if the leak is minor.
 
I do think the best thing is to get an independant Porsche Specialist to look at it (NOT PORSCHE for gawds sake). Most charge around £35-£45 an hour and its much safer than driving around with the 'possibility' you could do more damage. For example, say it is the head gasket and it does let go catastrophically, causing the head to warp ££££££

Twice I have been bitten by delaying getting a known problem fixed and both times got stung. One was a misfiring Metro that cost me £600 for a new ECU, the second was this year when my known slightly rusty exhaust fell off in Germany costing me ££££ for a second hand replacement in a hurry
 
oliver

I note that your car has done quite low mileage and sticking injectors were a problem on my 968 when I got it as it had been used very little for a few weeks before I got it.

Are you using s'unleaded? if not run some Optimax through it to see what happens after 100 miles or so. If there is some improvement you could also try some injector cleaner in the fuel as well -- the STP product ended up doing the job for me.

I may be way off track with this as the temp sensor theory sounds far more plausible -- at least my check will not damage your wallet too much and may help to eliminate possibilities.


paul f
 
Try removing the electrical plug from one injector, if the engine runs ok on 3 cylinders it points to a faulty FPR.
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top