84 gslse fuel cut out problem
 

i have a 84 se with rb header and silencer bones intake . im haing a problem . the car came to me with a bad fuel pump , it didnt pump with the jumper wire in place and the key on. i replaced the pump with a oem replacement made by Master pumps i also replaced the filter and fuel presure reg from mazda. i have a new boch o2 sensor decent plugs and wires and decent compresion. i also replaced all intake manifold gaskets and all vacume lines everything torqed to spec .tps is set properly. the car will start after a few trys then stays at 750 to 800 rpm. it sometimes trys to rev down and die . any time i try to give any gas it goes lean on my af ratio meter and will die if i dont let off the gas. if i do let of the gas fast enough the car recovers to an idle of 750 to 900. if any one has any info all is needed . this is my second first gen only first fi gslse . this project has been in the works for a long time .i need to drive this baby!!!!!!!

i had this same exact problem...dunno what exactly fixed it...we just kept adjusting the r-l screw, changed out the sensors, switched out the cap, rotor, plugs, cables, air filter and dropped some MMO while reving around 5000...like i said...dunno what cleared it up, but one of those did...now she purrs like a kitten :)

Ok, I have 2 questions:

1st How you put a fuel pressure tester to verify fuel pressure at idle and with load?

2nd, when you changed the fuel pump, did you notice a filter that was up inside the 3/8" supply line. I notice it when I was changing pumps, as was trying to plug the 3/8" line. I was able to pull it out. I would guess it was a factory pre-filter prior to go thru the pump. Mine was hella dirty, cleaned it out and put it back in there.

When I looked it on the parts sheet they do not show the inside cone shaped filter, not to sure why not.

John

check and make sure your AFM door is not sticking.

how do you check to see if the maf door is sticking