Menu toggle

Idle Issue

robwright

robwright

New member
Stuart I am presuming that Al still has not installed the correct chip after rebuild for your set up after it failed after engine rebuild? If this is the case then there is no point diagnosing anything until you have the correct chip installed for your setup. You can however adjust your idle AFR if you want to. It should be 14.7 on idle which is perfect stoich. I would advise waiting until you have your chip setup correct first before doing this.
 
Hi All

Got another small issue reared it's head since my engine rebuild. Once the car has heated up the revs are sometimes dipping down to about 200/300 rpm when I dip the clutch, mostly it catches again and idles ok but the odd time it has cut out. On throttle it's as sweet as a nut with AFR's good throughout, incidentally on idle I am seeing about 15.5/16 AFR which is way higher than the 13 odds I got pre rebuild. Rings have been done though so maybe that has caused that change.

Anyway, what is most likely culprit for the idle issue? ISV, TPS or even MAF? All replies appreciated.

Stuart
 
Cheers Rob. We have the correct chip installed now and it's behaving the same on idle as it was with the standard chip. I had hoped that would help but it didn't. However fuelling on throttle is now bang on, just have this idle glitch. I don't think I can adjust my idle AFR as I'm running a MAF which has done away with the adjustment screw? Answers on a postcard! Cheers Stuart
 
Yes, there is no adjustment possible with the SciVision MAF. As I said on the other board, maybe it's a vaccum leak.
 
My idle problems were caused by a split hose to the ISV. New hose was cheap...fitting it wasnt! (well once the manifold etc was off seemed like a good time to change the head gasket and do the valve seals!!)
 
Full marks to TTM, vac hose had come loose. Fixed it and all is well, idle AFR's back to mid 13's and no idle issues! Stuart
 
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
Back
Top