xxxpatsabxxx Posted January 5, 2010 Share Posted January 5, 2010 hey everyone, im not a new 260z owner but the problems my car are having are new to me. im not 100% sure about the problem which is why ive turned to asking those who know the l series engines better than i do. i recently put in a new exhaust system and replaced old gaskets so i had to take everything off of the motor (dual webber carbs, intake manifold, exhaust manifolds) i put everything back on and the car ran great for a few days. but then a rough idle developed, constant smoke even after warming, and flames out of the exhaust pipe when sitting in the drive way. the car will have high rpms when in park but as soon as i put it into drive or reverse the rpms drop severely and sometimes the car even dies. i replaced the plugs and within 2 days the plug in cylinder 3 was blackened which leads me to the conclusion that i have bad valve seals (or valve problems) .... but this is where im not sure completely... if i could get another persons opinion on the problem it would be much appreciated. - PatSab Quote Link to comment Share on other sites More sharing options...
xxxpatsabxxx Posted January 6, 2010 Author Share Posted January 6, 2010 i was looking around at causes of backfires and the explanations that kept coming up were poor fuel to air ratios. this led me to research rebuild kits for the weber dgv's and it got me wondering whether or not i should just find a set of Su's instead. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted January 10, 2010 Share Posted January 10, 2010 Well start by getting the service manual so you're not firing into the dark. http://xenons30.com/ Unless you plan on doing the rebuild yourself I think a set of SU's with intake etc. wil run you about $150-$200 depending on the condition, and that's the high end. Quote Link to comment Share on other sites More sharing options...
xxxpatsabxxx Posted January 13, 2010 Author Share Posted January 13, 2010 wow, great link. im going to pull my carbs off soon and put em on the classifieds to see if anyone would want to trade or if i can get a few bucks out of em. i might be able to rebuild them myself, but my brother is the carb expert (usually v8 4 barrels) but if i get an SU video i think i can manage. Quote Link to comment Share on other sites More sharing options...
FricFrac Posted January 13, 2010 Share Posted January 13, 2010 If you are going to go the SU route I've only heard rave reviews about the Z Therapy stuff so you might want to check it out (http://www.ztherapy.com/). I personally haven't used them but when I keep hearing nothing but good things its worth mentioning. I am far from an expert (closer to moron status actually) on the L6 but is a pretty robust engine - I'd think you were running rich rather than valve problems. Getting a set of SU's might be a good idea and keep the Webbers to go back to once you've got a working car as a baseline... Quote Link to comment Share on other sites More sharing options...
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