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Car Forum / Porsche / Porshe 944 / August 2008fuel injector leak- 86 944T
I've got fuel dribbling out of the place where no. 1 and 3 injectors go into the intake manifold. It's definitely from the O-rings because thr injectors can be easily rotated. No. 2 is very dificult to rotate and no. 4 won't rotate at all. I had such a leak before and replaced all of the O-rings, even though the originals looked OK, so the haven't deteriorated. I haven't had any trouble until this week, I tightened the fuel rail which lessened the problem, but didn't eliminate it. Before I take the whole thing apart and go out and buy new O-rings I have two questions. Would it make sense to use silicon sealant or something similar to help seal these these things? I understand that there is a Volvo model that uses the same kit as the 944T. Does anyone know which one? It would make my life easier if I could just walk the 15 blocks to autozone, rather than to send off to Pelican. Thanks in advance. I went to Autozone and asked. They gave me Ford F-150 rings which have worked fine. Every few months you need to spray some silicon oil around the injectors to lubricate the rings and prevent them from drying out. no opinion on whether F-150 rings are right, but I never had to spray anything on rings to protect them - this is after owning/driving/maintianing 944s for over 20 years - in fact I never had a fuel injector o-ring fail - so something odd is going on - RENBAY sells a kit with the rings at a reasonable price - now none of my cars were turbos, so maybe there is something special there, but I kinda doubt it. I think you either got incorrect rings, or the loose fuel rail caused vibration that made them loosen up and go bad. > I went to Autozone and asked. They gave me Ford F-150 rings which > have worked fine. Every few months you need to spray some silicon oil > around the injectors to lubricate the rings and prevent them from > drying out. ** Posted from http://www.teranews.com ** > no opinion on whether F-150 rings are right, but I never had to > spray anything on rings to protect them - this is after [quoted text clipped - 13 lines] >> some silicon oil around the injectors to lubricate the rings >> and prevent them from drying out. ...and introducing a silicon based product into the fuel system seems like a good way to destroy our $$$ Oxygen Sensors, I would think.  SignatureJack I also NEVER had a problem with the fuel injectors - and never sprayed silicone in there either.That's 800K miles with 2 944's. One car alone had 550,000 miles and I never replaced one injector or seal. Never used dry gas either - or any gas tank cleaner. Cheapest gas, cheapest Wal Mart oil that meets Porsche specs - and away we go... However, if I were to replace the seals, I would give them a shot of silicone lubrication to get them to seat properly. Matter of fact - I just checked the manual... and it says P. 24-12: Installing Fuel Injectors - COAT BOTTOM SEAL WITH A SILICONE GREASE... joliett ______________ ______________ >> no opinion on whether F-150 rings are right, but I never had to >> spray anything on rings to protect them - this is after [quoted text clipped - 16 lines] > ...and introducing a silicon based product into the fuel system seems > like a good way to destroy our $$$ Oxygen Sensors, I would think. > I also NEVER had a problem with the fuel injectors - and never > sprayed silicone in there either.That's 800K miles with 2 944's. [quoted text clipped - 10 lines] > > joliett ______________ Watch for line wraps, but do read the articles before reaching for that silicone based grease. I'll only post a couple URLs but there are thousands available warning of the harm that can occur to the oxygen sensor when silicone based products, other than those marked "Oxygen Sensor Safe" are used. <http://www.pelicanparts.com/BMW/techarticles/JF- Tech/about_oxygen_sensor.htm> <http://www.autozone.com/az/cds/en_us/0900823d/80/11/4b/65/0900823d80 114b65/repairInfoPages.htm> So do as you see fit. I'll continue to err on the side of caution where silicone and O2 sensors are concerned. SignatureJack |
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