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911 not firing on 1 cylinder
Need some advice...again! Last year, had trouble with my 1989 911 not starting and draining the battery overnight. Followed the advice I got here, replaced the DME relay. It then cranked up, but rough-running...appears that one cylinder is not firing (it had been sitting with no use for over 6 months). Been under the weather for months, so I let it sit...for almost a year this time, and finally got back to it. Tested this out by removing a plug wire, cranking it up, and seeing if it ran worse or the same. Isolated the problem to the cylinder closest to the rear of the car on the passenger side...car runs the same whether that plug wire is on or not. Pulled that plug wire off, plugged it a spare plug, cranked it up...lots of fire. So, I assume that I may have a blocked injector...?
Is there any way to clean the injectors without pulling the rails out and sending the injectors out? Complicating factor is that there is a air cond. compressor blocking access to the rail. Anybody want to buy the cleanest 911 you've ever seen? Thanks for any suggestions... Steve 
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05-04-2013, 10:16 AM
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Member 911 Anonymous
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You can try some BG44K, but if you know for certain it is clogged the best thing to do is remove and service, to test swap to the next cylinder to see if that one miss fires too.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-26-2013, 11:46 PM
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76 911S Targa
Join Date: Oct 2010
Location: Idaho
Posts: 1,150
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You have shown that you have fire to the spark plug but you have not shown that the plug itself is firing. Pull that plug and examine it. If it is wet, you are getting fuel and the plug is not firing. If it is dry, you are not getting fuel and then you can work back from there. Could be a stuck valve for example and you have no compression on that cylinder. Be methodical. Check the plug.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods. |
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05-27-2013, 07:44 AM
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Registered
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I'll take your offer........
Quote:
mcedata, I'll take your car as is!!!! You don't have to make it run as long as the car is clean and sparkling. I've been looking for cabriolet in immaculate condition (interior & exterior) and engine condition not critical. You car is just exactly what I need. A car that needs some TLC. That's a beautiful car you have there. I wish I could afford your asking price. Tony |
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05-27-2013, 09:59 AM
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Registered
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Well, this one has a happy ending. Took Targalid's advice, pulled the plug from the offending cylinder; not firing. Replaced the plug, cranked her up, now running smooth as silk, once again. Been awhile since I've been able to mess around with those twisty roads back in the woods. I'm reminded, again, of why I love a Porsche!
Thanks all for the support... Steve |
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07-05-2013, 01:28 PM
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1989 Porsche 911 Cabriolet 3.2
Marble Grey
