06-25-2006, 03:24 AM
Join Date: Oct 2005
Total Cats: 0
i fried my 1990 miata with a 2001 alternator
ok heres the story...
bottom line i screwed up and overlooked the fact that when swapping a 1.8 from a 2001 into a 1990 miata using the 2001 alternator is a huge no-no.
sadly the incorrect alty overcharged my battery (later a friend told me my safcII was reading 16 volts) cooking my battery plumping it up like the incredible hulk. ever since then my car hasnt ran.
heres what ive done to try to remedy the situation...
i have bought a re-furbished autolite 1994 miata alternator.
i bought a brand new battery from batteries plus (miata specific).
i have replaced the main fuse (80 amp) that showed signs of damage from overcharging from incorrect alty
i tested the +B terminal at the diagnostics connector and i DO have +12V
i tested both the white/green and white/red wires at the main fuel inj relay both DO have +12V.
i have peered into valve cover, cams are turning.
i tried bypassing the SAFC AFM hook ups (my safcII shows 100% airflow reading even with the AFM disconnected!!!)
heres the current diagnosis...
i have no CEL with key on. (it doesnt come on like it should be when key is first turned on)
my safcII shows 100% airflow reading even with the AFM disconnected!!!
motor turns but wont fire.
when i turn the key on/start i can hear the walbro fuel pump turn on, then shut off after short time (3 seconds?)
no evidence of spark with timing light connected.
things non-engine related that works: healights, blinkers, parking lights, wipers, gauges, instrument lights
thing non-engine that dont work: my stereo (lol)
(and related to alty mishap, my "room" fuse on drivers side fuse box keeps popping even with key out of the igntion.)
im still searching/reading on this issue, i have not tested the open circuit relay yet, but i hope to do it soon. im also gonna pull my ECU and open it up and look for obvious burn marks etc. im really hoping i can remedy this problem before july 8th (battle of the imports @ pacific raceways in seattle) i want to see what my turbo set up (precision GT3076R) on the 1.8 is capable of.
Thank you very much in advance for any help you guys might be able to throw my way.