240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

Won`t start :(

Old 01-26-2008, 01:33 PM
  #1  
Mr. Fancy Connectors
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Won`t start :(

I was going to work on my 74 260z today and it wont start, It turns over and over and over but will not fire. I got spark and I got fuel. So I start investigating and I find that it is flooded bad... For those who don't remeber I got the dual weber setup, and I am running an after market 4psi inline fuel pump. I had it running pretty good but was missing on two cylinders, I decided this is due to the spark plug wires having big holes in em and running auto lite plugs. So today was new plugs new wires cap rotor and a royal purple oil change, But it wont start to get into the shop, Any ideas? Mostly why is it flooding so bad?

If I can find it I got a video from the last time it was running you can hear it missing.

<embed width="448" height="361" type="application/x-shockwave-flash" wmode="transparent" src="http://i221.photobucket.com/player.swf?file=http://vid221.photobucket.com/albums/dd64/Matthew_H_Boise/MVI_1525.flv">

Last edited by Mhinrichs; 01-26-2008 at 02:07 PM.
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Old 01-26-2008, 01:58 PM
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are you quite sure that you are getting spark? and i'm guessing that your webers are side draft right? flooding could be from too much choke or from turning over so long without spark. if it was missing before that could have been from running too rich, unless you are sure that it was a spark problem.

if these carbs havn't been tuned well yet, i suggest tapping out the main jet holes so that you can put holley jets in there. they are cheaper and more plentiful. i think you can buy the drill bit and tap together in a kit to make them fit. i did it on my down draft and it saved me a bunch
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Old 01-26-2008, 02:09 PM
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In the video you can clearly see that they carbs are downdrafts, not sidedrafts.

From my understanding and experience with these carbs, they are a royal pain in the ****. Good luck

From watching your video it soulds like you have one or more of your spark plug wires on incorrectly.

Last edited by Sweets; 01-26-2008 at 02:14 PM.
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Old 01-26-2008, 02:12 PM
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they arn't that bad! once you learn to look at all of the 20 variables that they use....
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Old 01-26-2008, 03:45 PM
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Originally Posted by justin260z
In the video you can clearly see that they carbs are downdrafts, not sidedrafts.

From my understanding and experience with these carbs, they are a royal pain in the ****. Good luck

From watching your video it soulds like you have one or more of your spark plug wires on incorrectly.

Spark plug wires are correct one has a hole in the side I think its throwing an arc. I am more stumped as to why its flooding out, I may start looking for a mid 80`s 300zxt to do an engine swap and get rid of carbs forever!
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Old 01-26-2008, 03:46 PM
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Are you positive its flooding??? Id look into the arcing plug wire before you go any further.
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Old 01-26-2008, 03:53 PM
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just in case...



make sure all of your plugs are ok.
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Old 01-26-2008, 03:58 PM
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[QUOTE=justin260z]In the video you can clearly see that they carbs are downdrafts, not sidedrafts.

i can't watch vid's. dial up.
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Old 01-26-2008, 04:13 PM
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1-5-3-6-2-4

15 to young 36 to old 24 just right
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Old 01-26-2008, 04:28 PM
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I know I know. 153624 they are correct its flooding. I can look into my carbs and see pools of gas, also spark plugs are wet. I`ll work on it more tomorrow.
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Old 01-26-2008, 04:32 PM
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you need smaller jets. and several good books on tuning webers. because main jets are only the first thing. then you need emulsion tubes and a whole bunch more to get it tuned right
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Old 01-26-2008, 04:33 PM
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ive heard nothing but bad stuff about those carb's. look into something like stock hitachi (the round top 3 screw are the best and i got a set for sale ) or a 4 barrel (good performance AND are VERY VERY easy simple and reliable. or a go extreme and go triple's. you might need a carb rebuild and then tune. and definatly get that new cap rotor etc. on.
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Old 01-26-2008, 04:36 PM
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how will getting triples help!? that makes it harder. they are only bad if you don't know how to work on them. it took me a while, but i finally figured mine out on my last car. they are good.
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Old 01-26-2008, 04:47 PM
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i said or go extreme. not recomended. they are hard to keep in tune also. but still better than those DGV's imho
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Old 01-26-2008, 04:53 PM
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yea i would always pick a side draft over a DGV. i see what you are saying now
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Old 01-26-2008, 06:12 PM
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Originally Posted by snwbrderphat540
ive heard nothing but bad stuff about those carb's. look into something like stock hitachi (the round top 3 screw are the best and i got a set for sale ) or a 4 barrel (good performance AND are VERY VERY easy simple and reliable. or a go extreme and go triple's. you might need a carb rebuild and then tune. and definatly get that new cap rotor etc. on.


How much do you want for your hitachi and do you have a manifold with em? or If i went four barrel where would I find a manifold for that?
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Old 01-26-2008, 06:26 PM
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don't give up! the webers are beast! very throaty sound
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Old 01-26-2008, 09:25 PM
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i have the manifolds and carbs yes. the 4 barrel manifold for a good one and cheapest price go here: arizonazcar.com
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Old 01-27-2008, 08:40 AM
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I made a homemade 4 barrel intakemanifold with custom linkage. You can prolly make your own if you're creative enough.
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Old 01-27-2008, 12:19 PM
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So I woke this morning to work on my Z and when I went outside it was raining, snowing, hailing all at the same time, with 30mph wind gusts. No z work for me today, no way am I opening my hood with 30mph wind gusts. I may get the tractor and pull it to the shop after the wifey gets home.
I will keep you updated.
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Old 01-27-2008, 12:47 PM
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oh yeah and these carb's typically go for 150. but since mine i only heard were running the car 4 years ago before the engine was pulled (they do seem to be in great shape though clean and move freely) for a V8 swap by the PO id prolly do 100. but if you feel thats to much PM me im open to offers/haggles.
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Old 01-27-2008, 02:56 PM
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Originally Posted by justin260z
I made a homemade 4 barrel intakemanifold with custom linkage. You can prolly make your own if you're creative enough.

Can I see a picture of your homemade manifold? I think I am going to build my own and run an edelbrock.
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Old 01-27-2008, 03:12 PM
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What a day, now my water heater is flooding,.... I`ll be offline for a few hours to replace it.
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Old 01-28-2008, 06:06 PM
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260zt coming soon.

And so the fun begins, I just purchased a l28et out of a 280zx Has the wiring harness and ecu, plus a bunch of other little parts I need for my 260z. This is gonna be awesome. I`ll keep you up to date and try to have pictures as I go.
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Old 01-28-2008, 06:10 PM
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nope, you cant do it, i did it to my 260Z and so did 260zturbo. to many turbo 260's on this site already. stop now or GTFO!
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