I just picked up my rx7 from the guy who rebuild my motor and it does not want to rev over 2 to 3000 rpm feels like there is a bad spark plug wire or bad fuel filter it sputter's , the guy told me it was my fuel pump I ran out of money so i had to bring my car home could not afford to leave it there any info would help. thanks.

 

If your mechanic says it's a bad fuel pump i'd take his word for it, but the catalytic converters could also be clogged up if you still have them on.

 

cats are off i got a racing beat full exhaust.

 

Ok. My car did them same thing when my cats where clogged. I can't really think of anything else, but it might help others if you mentioned what year, model, and mods where done to the car.

 

1988 10th ae t2 stock motor

 

Will the car idle normally?

 

yes it even runs when i take off slow but when i try to go faster it sputters.

 

Does it take off real slow? Could be the timing is off.

 

it doesn't take of that slow it seems to sputter when the boost gauge starts goin up.

 

Could be the throttle position sensor... It may have corroded connections.

 

how many miles are on the rebuild?

 

You know, the last car I've seen do this had a clogged fuel filter. Start there first. At the very least if that ain't it you have some proper routine maintenance performed.

 

Cars car "backfire" due to rich AND lean conditions. If your not getting enough fuel, that could very well be it.

 

If your mechanic said it was the fuel pump, I would start from there. I have a Walbro 255 fuel pump I could sell you. $50 shipped with the sock.

Before you go buying things, pull your fuel pump and look at the sock at the bottom of the pump, if its all dirty and clogged try replacing the sock. If the pump itself is failing, then buy a new one. A new fuel filter wouldn't hurt either, they're about $10.

 

Also, if you just had your motor rebuilt, you really shouldn't be bringing it over 3k rpm. I think the limit is 4k rpm for the break in period but to be safe, I wouldn't drive it over 3000rpm.

http://www.rotaryresurrection.com/2n...p_breakin.html

 

Unplug the TPS and go for a drive.

 

thanks for all the info i adjusted the timing and its running bettter im goin to try the basic stuff first like plugs and wire ,fuel filter and see what happens ill keep you guys inform on my progress.