Menu toggle

Hunting idle / Throttle to start

MarkGolf

MarkGolf

PCGB Member
Member
Hi Guys,

Hoping someone can help me out, I may just need to take it for a hard blast but before I do, if anyone has any pointers here, that would be great.

I recently fitted new coils, rotor arms, caps, plugs and performed a distributor rebuild. I did all of this as it had developed a misfire which has now been resolved.

However, I used to be able to turn the key and it would fire instantly, however now, when cold, I have to apply some throttle.

Once started, the revs seems to be going up and down as you can hear in the video below.

https://youtu.be/spbFu9f2XXc

if I unplug the ISV, the car dies. I can hear a mild hissing up at the top of the engine, seems to be around the black cylinderical thing but I think it is just the air passing through it internally and not an external leak, I did mist some water around the area and didn't spot it being blown around.

I haven’t done anything as yet in terms of cleaning the ISV, MAF, etc but does anyone have any ideas on why the idle isn’t perfect and I need to apply throttle to start?

Thanks
Mark
 
Mark,

If you think the ISV is not stuck and everything else is connected and not leaking, perhaps try a 964 System Adaption as it does seem to fix a lot of odd behaviours and all the ignition has been replaced ?

I did one recently after replacing the O2 sensor and its quite different after the Adaption as I ran it pre with just the new sensor.
 
Thank you!

I had just seen another post on another forum mentioning this, especially on my ca which always has it's battery disconnected.

However, I do not have the scan tool to do it with. What do you use?

I actually need someone with PIWIS for my Cayenne! My basic code reader doesn't quite cut it with these Porsches.
 
I use the Porsche Bosch Hammer to do this ...Tore has then for sale but I brought mine decades ago . sorry I dont have the PIWIS .

I think it will fix your issue

Im in Guildford if you can get the car over ?
 
Hi Ian!

I think I will have to take you up on that, I'm just down in Sutton, nice A3 sprint.

Just to add, I have changed a few things, inc the o2 sensor and not done any adaptations.

When the weathers better, I wouldn't mind popping up to see what you can do and talk 964!

I have a 2 hour+ drive with the family in the car planned for July, so want to make sure it's good for that.

Thank you!
 
Mark , if you have changed O2 you need to do a adaptation to get the best from any new H/W , drop me (PM) line so we can sort it for you .
 
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