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Car only reaches 4k rpm

Old 05-19-2012, 12:19 PM
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Car only reaches 4k rpm

My 1976 280z is only reaching 4000 rpm on every gear when i accelerate and struggles to get to 5000 & 6000 rpm on nuetral. The guy at Mike Z Shop told me it was a bad AFM and i was wondering if i should buy the afm from the z store for $169.95 with a $400 core charge or pay $250 for him to do it. Can people who had problems with their AFM please help.
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Old 05-19-2012, 02:42 PM
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Why are you going to pay someone $250 to remove four bolts, two clamps and a plug?

And I would bet all you really need is a tune up, generally when the AFM goes out of adjustment it either doesn't run at all, runs REALLY rich or really lean. if you have a multimeter there is a section in the FSM that tells you how to check it.
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Old 05-19-2012, 05:30 PM
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I know i took it off before i posted the thread it's $250 for the part basicly after i searched around.

So then what could be the cause of maxing out at 4000 rpm
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Old 05-19-2012, 09:16 PM
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Originally Posted by Bucket280z View Post
I know i took it off before i posted the thread it's $250 for the part basicly after i searched around.

So then what could be the cause of maxing out at 4000 rpm
Hoov suggested a tune up.

Got one of these? Clicky

I suggest you buy one if you don't. Easy diagnoses of multiple things.

XenonS30

You can also download the FSM there.


For starters, check your ignition timing, check/replace distributor cap, spark plugs and wires, check the fuel system. Is it stopping because it's running too lean? Could be a lot of things.
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Old 05-19-2012, 10:22 PM
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Yeah ill try the tune up cause my car had its head rebuilt and the gas tank cleaned out and it runs fine.
I bought the manuel and have read the xenon link but ima have to recheck.
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Old 05-20-2012, 08:24 AM
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Have you "rebuilt" your afm yet? it takes all of 15 minutes, a screwdriver and some silicone. could save you some money. check this out-

https://www.zdriver.com/forums/240z-...our-afm-15277/
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Old 05-20-2012, 01:40 PM
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^^^ Excellent post young chap!
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Old 05-20-2012, 10:25 PM
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Originally Posted by ZZzzz View Post
Have you "rebuilt" your afm yet? it takes all of 15 minutes, a screwdriver and some silicone. could save you some money. check this out-

https://www.zdriver.com/forums/240z-...our-afm-15277/

Thanks man for this ima try this
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