fuel or... spark? problem help!!!!!

[mark458]

ok i just got an 83 280zx turbo it sat up for a year befor i bought it. on my way home from buying it it ran good then all of a sudden the tach stated jumping and it started sputtering and the sensor light came on then it died i thought i was out of gas so i put gas in it and cranked it up and finished driving it home. the next morning i cranked it up let it warm up and now it wont rev above 3000 rpms. as i slowly push the gas it revs up and it hits 3000 (not floored) and the more gas i give it the more it boggs down. now if i clamp off the fuel return line i can rev it up to 5000 rpms before it boggs down someone help i put new plugs,wires, fuel pressure regulator, fuel filter, and ignition coil still no good

Someone please HELP!!!!!!!!!!!!!!!!

[Zs-ondabrain]

i'd start by tossing the regulater and blowing the fuel back into the tank

you've got something blocking your fuel somewhere.

And double check your coil

get back to me

[mark458]

i already replaced the coil and regulator and still nothing nothing it drives ok for around toen but i cant floor it i am going to put a new msd fuel pump on it on the 9th

[ZmeFly]

make sure the car is in time, check all hoses for vacumn leaks, ALL OF THEM, and once you have done them all do it again, trust me. if you dont have a FSM at least get a haynes and do some diagnostics which are easily performed with a multi meter. this tool is one of your best friends.

[Zs-ondabrain]

Hey, he's right.

I lay praise to the multi-meter gods every night before waking to an electrical nightmare

[mark458]

ureka!!! i replaced the injectors with '75 mercedes 450sel injectors they havea flow rate of 420cc's as compared to the stock 259cc's but now i have vavle clatter when i and pushing possitive boost someone told me to adjust the valve lash there is a new timing chain (3 years old) any suggestions?