if you unplug the afm it shouldn't run better. the afm is what tells the ecu how much fuel to inject for the amount of air coming in the intake. Are you sure that is what you unplugged? Download the fsm at xenon website (google it). Get a reading on the fuel pressure (see pic) at the ring Also the fuel injection bible is a good document to help with troubleshooting and understanding the z FI system. not specific to the s130 but still a good guide. broken exhaust manifold studs are common to the L28 engine and could be your exhaust problem. Vacuum leaks are a bugaboo on the L28. CHTS can be another problem. Read the fsm and do some searching on this site and use google. clean contacts on afm, ecu and tps.
another newbie here...
Guys, I have rebuilt Ford V8's and I work on old motorcycles, but I don't know anything about these 280zx FI systems and such. I have an 81 zx that was my dad's car. I've had it garaged for at least 5 years now. I used to drive it occasionally and it ran great but developed an exhaust leak at the manifold (sounds like it's at the front cylinder). Anyway, that's why I quit driving it.
So currently, the car will start but doesn't want to rev. It will spit, sputter and want to die when I give it gas unless I pump the pedal quickly, then I can get the revs up and sometimes it cleans up nice at about 3-4K.
Anyway, it seems to be getting spark to all 6 and all 6 injectors are ticking. So I was thinking AFM. I unplugged the AFM (electrical connection) and it revs great. So, I thought it was the AFM. I ordered a used one and installed it yesterday but it runs the same. Not sure if it's something else or another bad AFM. Any ideas? And the exhaust leak is real bad now...I can feel exhaust when I stick my hand up under there but can't come close to seeing anything. Could the leak cause severe intake issue?
Thanks.
So currently, the car will start but doesn't want to rev. It will spit, sputter and want to die when I give it gas unless I pump the pedal quickly, then I can get the revs up and sometimes it cleans up nice at about 3-4K.
Anyway, it seems to be getting spark to all 6 and all 6 injectors are ticking. So I was thinking AFM. I unplugged the AFM (electrical connection) and it revs great. So, I thought it was the AFM. I ordered a used one and installed it yesterday but it runs the same. Not sure if it's something else or another bad AFM. Any ideas? And the exhaust leak is real bad now...I can feel exhaust when I stick my hand up under there but can't come close to seeing anything. Could the leak cause severe intake issue?
Thanks.
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If you have an exhaust leak...deal with that before you start jumping to conclusions. This car was bad about popping the #1 or #6 exhaust stud...hence the leak. If it is the #1 it also heats up the waterneck and screws up those sensors. Plan on replacing the bolts with studs and nuts.
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