No spark New (to me) '87 FC
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Joined: Jan 2012
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From: Prairie Village Kansas
Last statement doesn't compute. If you're getting 2.5 volts on the Vref wire, which connects to most of the engine sensors, then the car will run very poorly. Something is lowering the voltage from what should be 5 volts. The AFM is the likely culprit. If not then it is one of the other engine sensors; TPS, Variable Resistor, ATP or Pressure sensor and even just the Brown/White wire itself grounding out.
Pull the two wire plug off of the back of the alternator and ground the White/Black wire. Other wire in plug is Black/White so do not confuse the two. W/the W/B wire grounded and key to on the idiot/warning lights should come on. Check for this and see what happens. W/key to on the alternator is supposed to place a ground on the White/Black wire. If it doesn't then the alternator needs replacement.
Pull the two wire plug off of the back of the alternator and ground the White/Black wire. Other wire in plug is Black/White so do not confuse the two. W/the W/B wire grounded and key to on the idiot/warning lights should come on. Check for this and see what happens. W/key to on the alternator is supposed to place a ground on the White/Black wire. If it doesn't then the alternator needs replacement.
Thread Starter
Junior Member
Joined: Jan 2012
Posts: 37
Likes: 0
From: Prairie Village Kansas
Well thank you for all the help. Unfortunately I just had a chance to "cheat" a compression test and it sounds like have blown apex in rear rotor. So the spark situation has become irrelevant basically.
I had a similar problem had no spark re wired it and now it has spark only 1 spark for every 3 spins of the CAS I have changed it twice and changed Tue coils twice and tried 3 different ecu's wiring is good I have continuity to the ecu and CAS and coils and grounds are good anyone got any ideas?
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2nd Generation Specific (1986-1992)
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Nov 18, 2015 08:41 AM
