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when i was going down the freeway, my automatic 240z started to loose HP and rpms. even when i pushed the accelerator all the way, it only got to 50 mph? it only happened when i was driving fast for about 15min. what could it be? do i need a tune up or the cad removed?
 

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He is refering to a catalytic converter and I'm pretty sure the 240 does not have one,only a pre muffler. Sonic I would guess a fuel delievery problem or a spark problem not an exhaused problem.
 

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He's probably referring to his catalytic convertor (cat).

But back to his point. I've posted on this before and it may seem like I'm beating this to the ground, but my car went from a nice sporty Z to a tired beat dog dragging it's butt around, so much so that I wouldn't have raced a moped.

The mechanic who restored my baby showed me the culprit, after I had taken the car in to get fixed properly. Inside the distributor is the vacuum advance plate that moves the rotor.
This plate is plastic and holds several ball bearings. After years of heat and use it gets brittle and breaks. In my case I had ball bearings all around the distributor which probably didn't help at all. Anyhow, when this thing breaks, it usually throws your timing off, that's because the vacuum advance that has occurred now cannot return to the proper setting. When you accelerate again, you create more vacuum and once again it may / may not actuate the advance mechanism and once again it messes up your timing.

The ONLY fix is to replace it.

With a new one, apparently still available from the dealer, my car is once again fast peppy and if it weren't for the u-joints might burn rubber.

FWIW
 

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LOL

Escanlon,
I get a kick out of
"and if it weren't for the u-joints might burn rubber."

Just makes me laugh and give a sigh knowing I'm not the only one with a car that likes to keep my wallet light and schedule busy.

Josh
 

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Re: ok that narrows it down!

Dear Z owner, it's a good idea to check the catalytic Converter. Check to see if it glows in the dark after driving it some time.(2) Check your air flow meter!!!! replace it or swap it to see if this is the problem. Hit me back later if you can. Size280. of United Z Club L.A.-LB.

Peace.
 

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Re: LOL

Had the same problem for 2 years. After new carbs, intake, dizzy and alternator upgrade, found fuel was bypassing my carbs. Added fuel pressure regulator, blocked the return line, problem solved. My $.02.
Jeff
 
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