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i'm still having problemes with my 240sx

Old May 26, 2008 | 08:02 PM
  #1  
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i'm still having problemes with my 240sx

well i still have power lag. i resently pulled apart the engine and replaced the head i even had my father help(he used to rebuild vw back in the 70s). ever sence i replaced the head iv felt a lag in power exspecially above 5k rpm. im at my wits end i need some help. i didnt do much else.
Old May 26, 2008 | 08:04 PM
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i did how ever repair the 2nd set of butterfly valves and replace a bad sensor.
Old May 26, 2008 | 08:08 PM
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what do you mean you repaired the butterfly valves?
Old May 26, 2008 | 08:10 PM
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i fixed the valve internals now it is functioning like it should, it was just not working at all
Old May 26, 2008 | 08:16 PM
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and the sensor i replaced is right below the intake manifold
Old May 26, 2008 | 08:20 PM
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im not really shure what it could be it might be a vacuume line mix up i had a hard time with the three down and to the left of the the intake.
Old May 26, 2008 | 08:20 PM
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sorry down and to the right
Old May 26, 2008 | 08:43 PM
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i didnt modify the head all i did is replace the head
Old May 26, 2008 | 09:03 PM
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would that sensor be the knock sensor?
Old May 26, 2008 | 09:32 PM
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ok first things first, and at the rick of sounding like a complete jerk i must say that all your above post sound like ramblings and nothing more. partial statements or misdirected questions only lead to more questions that will only complicate things.

the best i can figure with what little information you've provided the best i advise i can give is that you should re-check all the lines and sensor connections. make sure the connections are clean and the vacuum lines aren't pinched or came off.
Old May 26, 2008 | 09:42 PM
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by the way: you can just edit your posts, you don't have to re-post every time you have something to say.
Old May 26, 2008 | 09:59 PM
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sorry i saw jramo was online i figured he would respond quicker, but it didnt quite happen that way. my bad, any way. i cant find a site to show were the vacuume lines should go, ill just go buy a chiltons and go over the vacuume line once more, does any one know what that dang sensor bolted to the intake manifold is? its right below the intake pipe, and its real hard to get back in, its got a vacumme line coming from the side and one going to the bottom i can't remimber if it had any wires to it, i think it did. i cant find what it is any where on the net. i replaced it with one from my doner car. the one i had before had a nail in the sensor and a nail in the vacuume line. so i just replaced it.
Old May 27, 2008 | 08:01 AM
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post a pic of the part in question and i'm sure i can tell you what it is and if it at all could be responsible for your engine problems.
Old May 27, 2008 | 08:05 AM
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check timing.
check your vacuum
buy a chiltons


www.bumnah.com/fsms

it should have the factory service manual for you in that folder in pdf form. download. repair.
Old May 30, 2008 | 12:10 PM
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well it may be that my maf sensor was cracked on the bottom. knows how long its ben like that. it looks like it was ran over or something

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