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Join Date: Jun 2011
Location: Sacramento, CA
Posts: 7
76 930 smooth at idle. hesitation when accelerating

Hello everyone this looks like a great forum and I am hoping someone here can help me with my issue.

I have a 1976 Porsche 930 Turbo, 65K miles. The car is generally kept in storage and started and driven once every month or so. We recently had to get it out for smog check here in CA (which luckily it did pass today) and before hand we changed the oil and fuel filter and ran a few tanks of gas through it.

The issue is severe hesitation upon initial acceleration. At idle the car runs great and once it gets past the stumbling the car runs smooth. It is most noticeable in the lower gears. At some point years ago something may have been adjusted to help pass smog but we are not sure what that was. Car does not have a catalytic converter.

Thanks very much for any input.
Jerome

Old 06-14-2011, 11:05 AM
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First do a good inspection of the motor compartment and see that everything is inplace including the vaccunm lines to the WUR and distribuitor.

Put a timming light on it and see if your timing is advancing when you blip the throttle.

If that is not it then check the CO level which should tell you if your Air Fuel Ratio's are ok.
Old 06-14-2011, 11:36 AM
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A wideband air fuel meter would help to see if it runs lean which it sounds like.

You can always try to turn the idle CO adjustment a bit CW to see if that helps. If not set it back to where it was.
Old 06-14-2011, 11:36 AM
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Does anyone know where the CO mixture adjustment screw is specifically on a 1976 Turbo? I remember hearing about an adjustment screw that can be adjusted to help pass smog on this car and I think it was sometime back but never readjusted so the car can run smooth again.

911st: Everything in the motor compartment seems to be in place and I checked all the vacuum lines etc.. I still need to check the timing like you mention but I have not had enough time recently and i need to borrow a timing light from a friend.

smurfbus: I am having difficulty locating that screw! Can you give me a detailed description for a 1976?

Thanks everyone!
Old 06-22-2011, 07:28 PM
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Join Date: Jun 2011
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I finally located the adjustment screw and it only took about 1/8 of a turn of the tiny screw to correct the running lean issue I was having. You can see the T shape wrench at the top of the photo which is where the adjustment screw is hidden.
Thanks!
Old 06-23-2011, 09:53 AM
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Any pics of the car?
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Previous cars:
2007 GT3, 2006 Cayenne TTS, 1991 928 S4, 1987 930, 1975 914 2.0, 1989 944 Turbo S, 1991 964 Targa, 1991 964 Convert, 2004 996TT Convertible, 550-6 Spyder with a 2.4 liter twin plug "S-spec'd motor"
Current cars: 2012 Cayenne TT, 1997 993TT, 1984 Jeep Grand Wagoneer, 94' 928 GTS, VW GTI
Old 06-23-2011, 09:05 PM
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Quote:
Originally Posted by x98boardwell View Post
Any pics of the car?
+1. We need to get back in the habit of requiring a pic of the car before any questions are answered. There seems to be a lot of new blood around, would be nice to see their cars...
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Infraredcalvin - AKA Pat
'76 Turbo Carrera #311 - Factory LSD, Sport Seats
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Old 06-23-2011, 10:16 PM
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amen Pat - should make 'that' a STICKY on the homepage 8-)

no Q's answered sans PICS

EVER!!!

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Paul... CT | '87 930 | '08 M3 6gang vert |
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| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 S8 | '95 S6 6gang | '88 M5 | '87 190E 2.3-16 |
Old 06-24-2011, 06:17 AM
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