mpfi ea82, wired by me, ran for several thousand miles. not it will idle crappy, and when i step on the gas, it pops, and craps out, for a while, then takes off almost like normal.

i was thinkin tps, so i swapped it with a junkyard one, and it didnt help.

next i pinched off the fuel return line, after the fpr, and it ran fine, reved her up, and worked great still. so i replace my fpr with a junkyard one, and it does the same thing. so i vice gripped my return line, and drove it around the block, worked great, cept i found out where my weak links are in my fuel supply line =]

im wonderin, if this sounds like two bad fuel pressure regulators, in a row, or a wearing out napa fuel pump? it had enough pressure to leak at the hose clamps under the car.

any thoughts please

Sounds like a vacume leak at the intake boot. you are artifically adjusting your fuel rato by crimping the return line.

also check the maf for failure or dirt.

and lastly a shorted temp sensor circit will also tell it to run lean.

by the way that is a big no no in diagnosis to leave the return line crimped. well it sounds like you found that out already. pressures can spike to over 100psi. then the highly pressurized fuel tries to find another way out.

 

using a brief squeeze is ok (with a gauge attached)

ya, its a high pressure one, and it maxes at 90, and if its not going bad, thats what i was runing. hrm... guess i'lll go swap out the temp sensor. check back in 20 minutes, and i'll tell you if your right =]

 

just remembered... the car seems to idle fine, with the maf unplugged(when im not having problems i mean)

score!_!

after i replaced a 4 inch piece of carbureter hose, with high pressure efi hose :-\

i checked all kinds of hoses, and vac sealin areas. nothin

started it up, unplugged water temp sensor, nothin, blipped the throttle, perfect idle. plugged back in, blipped throttle, crappy as hell. =] unplugged it

and drove it around the block, and it runs like it used to.

gonna wait till she cools down to install this junkyard one. thanks alot!

i suspected it, but never thought it would make such a huge difference.

mpfi ea82, wired by me, ran for several thousand miles. not it will idle crappy, and when i step on the gas, it pops, and craps out, for a while, then takes off almost like normal.

i was thinkin tps, so i swapped it with a junkyard one, and it didnt help.

next i pinched off the fuel return line, after the fpr, and it ran fine, reved her up, and worked great still. so i replace my fpr with a junkyard one, and it does the same thing. so i vice gripped my return line, and drove it around the block, worked great, cept i found out where my weak links are in my fuel supply line =]

im wonderin, if this sounds like two bad fuel pressure regulators, in a row, or a wearing out napa fuel pump? it had enough pressure to leak at the hose clamps under the car.

any thoughts please

yeap that sounds i put on mine a a hand regulate fuel presure regulator and a bosh 125 psi fuel pump and then regulated at 50 psi fuel presure good octano fuel may help at least 90 octane also if you have a airflow meter the mass one hot wire one that also acts weird on your car

ok, pluged in the different sensor, and it does the same thing again =/

drove it to work today, with the sensor unplugged, and it runs ok... full throttle is ok, but 3/4 just starts bucking.

what the heck is goin on?

how do i zero a tps?