Hey guys, lately whenever I get above 4500 rpms in 3rd gear, 4000 in 4th and 3000 in 5th my engine stops giving me power. I drive an 1983 FB GSL. Is this a common issue? How can I fix it?
I talked to the guy that had sold me the car and he said that this was from either condensation building up inside the fuel tank or just my fuel filter needs to be replaced. It seems like it would be transmission related so I was considering replacing the fluid but I just don't know where to start.

 

Could be a problem with the output side of the transmission or the rear end, however if this was the case I would imagine you would be getting some godawful noise when the car bogs down. My gut tells me its a fuel issue, but I think you'd want to start here to diagnose it:

http://foxed.ca/foxed/index.php?page=rx7manual#firstgen

 

Change your fuel filter, this is a very common problem. The stock filter barely flows enough fuel when brand new. Even a slightly dirty filter will start choking your engine.

They cost about $4.00 and you can make the swap in under 20 minutes...



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I dont know too much about the 12a but it might be a stuck float in the carb.

 

id deff. go w/ changing the fuel filter first dout its the tranny if not making any noise and shifts fine..

but if you just bought it recently not knowning when all the maintance work last been done to the car.. i do it all at once and get it over with... first thing i did w/ mine. tranny , rear end , radiator, tune up, air and fuel filter, and oil change, seadfoamed it clean all the carbon out .. and shed pured and been running strong as my dd for 5 years

 

Change the fuel filter first and then replace the fuel pump if the problem persists. You're running out of fuel on the top end is how a drag racer would describe it.

 

Just to update I payed $6 for the fuel filter, swapped it in no problem and she is running better then ever. Thanks for the feedback.

 

Thanks for the update, Ben! A happy ending to these "mystery-doesn't-want-to-run" threads is always good to read, especially if it's on the cheap!