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Backfire, then no start
Hi all,
It's been a while since I've been driving my 911 or been around these forums. Thought I'd ask you all a question as I get back into enjoying these 911's we like so much. So, I got mine running again and had been driving it for about a week. One morning last week, I went to start it and it backfired pretty good and then would not start. If I let it sit for a couple of minutes, and tried again it would try to start but then just crank. All these attemps to start were with my foot off the gas pedal. So I took my non-fun car to work and when I got home again, all it does is crank and not even a hint of wanting to fire. My question is, where do you guys think I should start the troubleshooting? The airbox has a pop-off valve installed. I can't see any cracks in the airbox, but I'm sure there is a lot I can't see with just the airfilter cover removed. Thanks.
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Phil 1978 911 SC |
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ROW '78 911 Targa
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Is the pop off valve seated on its o-ring properly?
Basic tune up of ignition and check fuel pressures would be next, spark plugs fouled? |
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Registered
Join Date: May 2005
Location: Austin, TX
Posts: 909
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Check to make sure that you are getting spark. If so then .... check for vacuum leaks etc.
I had a similar occurrence, and after the backfile got no spark, turned out the "coil" inside the distributor had failed. That is "green" wire related. Just a thought. Jay
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2002 Boxster Speed Yellow |
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Checked out
Join Date: Jun 2009
Location: On a beach
Posts: 10,127
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Something has cracked/broken off, and now you have a big vacuum leak that is preventing the car from starting.
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Registered
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Pop off valve or broken air box.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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Banned but not out, yet..
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If you pop off valve popped completely off like mine did remove the air filter and you will see it unsecured. Clean out old glue or adhesive and mix a 2 part epoxy and reseat the valve and you should be good to go
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Thanks for the thoughts guys. I will go hunting for the culprit tonight.
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So, I checked spark, that was good. Plugs were not fouled. Couldn't find any hoses that got blown off or any cracks that might cause a vacuum leak. Then realized I couldn't hear the fuel pump. Turned out the fuse was blown. Weird! Replaced that and it started right up.
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ROW '78 911 Targa
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Good find, and thanks for updating with your results.
Now go drive it like you stole it! ![]() |
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arry911
Join Date: Nov 2011
Location: norfolk uk
Posts: 66
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Quote:
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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
Posts: 29,522
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Coil failure.
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Jim R. |
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Hi Jim...sorry, not quite sure what you mean.
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Phil 1978 911 SC |
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