My 87 Coupe died in my shop. Car is bone stock. Ran fine, parked it, moved it around a few times and now a no start There is no spark. Had a spare brand new Autozoo module so I put it in hoping to have an easy fix. No difference. Not a fuel problem. Pressure at the rails, pump runs in tank. Did some probing. No fusable links blown. Voltage to red coil wire is about 1.5 and green wire is about 1.9. Neither will light the Snap-On test light with KOEO or flash when cranking. Everything else in the car works. I am thinking at this point ignition switch? EEC power relay? Defective Chinese garbage module?
Thanks B. I will check the fusible link under the dash first. If it's good, I'll try the jumper wire to + side of coil and see if there is spark. Do you have a wiring diagram of the ignition circuits?
I may have one and I can look tonight, but it would be for '86 and may differ from your '87. I know at least one or two other people on here have some diagrams for '87 or '88 so hopefully someone will chime in...
Well I spent most of my Sunday under the dash. After probing and testing upside down I found an open circuit in the R/LG wire from the ignition switch through the firewall. I soldered up a new 6 inches of #12 wire and now it starts and runs fine. Every thing works now except the secondary cooling fan. (Not related, it never worked before). Primary fan operates fine. Anybody ever jumped the two fans together? Too much draw on one circuit? I live in south Florida so if both fans run all the time, that's fine.
Running both fans in parallel off the same relay in the IRCM = burned up relay = new big $$ IRCM. If you have the original 75 amp alternator, running both fans constantly will seriously load the stock altonatorand likely pull down system voltage.
Are you sure there is a problem with the aux fan? It only runs when the coolant temp as measured by the PCM goes over about 220 deg or AC high side press exceeds 310 psi. I dont live in the heat of south FL, but I only saw my aux fan run once.... with the original clapped out radiator on a 100 deg day stuck in traffic. Since I upgraded the radiator years ago, it has never run.
Jeff:
What Radiator did you upgrade to ?
I do not have any cooling issues since we brought he TC out of storage last summer - First day it was 97 and it hit 99 two day later - -Both fans perform under these conditions on our TC.
I used a Summit branded Aluminum rad for FOX Mustangs. Only a few minor mods needed to the brackets to mount it up. The core is about twice as think as the stock core. Its a very heavy duty design.