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1979 sc backfires ALOT
and doesnt go over 3000-4000 rpm i took her around the block and she did the same thing as in the idle stance it might be a vac leak etc i just want to know the possible causes and ways to fix it thanks
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06-08-2013, 12:17 PM
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Not enough info.....
So it was running great and all of a sudden this happened? Have you done anything to it recently? CIS i assume? Got a pop off valve in the air box? Did it get dislodged?
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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06-08-2013, 12:34 PM
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Pete is most likely correct a loose pop off valve will cause the problem you're having. There could be many other things also.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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06-09-2013, 09:50 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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could be:
bad control pressures bad WUR no power to the WUR clogged WUR screen/return bad thermo time valve(TTV) making it rich air leak pop off valve as mentioned cracked air box if no pop off valve timing advance not working fuel fuel filter bad fuel igntion plugs, cap, rotor you are really asking for a lot and giving us very little to do it with.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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06-10-2013, 04:09 AM
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79 SC slant nose conversion
1979 Porsche 911SC
1974 Porsche 911 targa 2.7
