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95 New Yorker quit running
03-20-2018, 06:55 PM
Post: #11
RE: 95 New Yorker quit running
I got mine at a salvage yard. I check first to see if I could return it if it didn't work. I also think you can look up the voltage that should be on the wires to the coil packs. I thought that it was near battery voltage? Yours seems to low which makes me tend to agree with you that the computer is bad.

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Garner

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03-20-2018, 06:58 PM
Post: #12
RE: 95 New Yorker quit running
just found out the new coil pack I put in it at first is only working on the middle 2 plug wires got spark in #2 & #3 cylinders only, if the computer was bad would that happen?
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03-20-2018, 08:48 PM (This post was last modified: 03-20-2018 08:51 PM by Rupe.)
Post: #13
RE: 95 New Yorker quit running
I didn't look up the ECM by part # but by application, which will give you the interchange of what else fits via an aftermarket unit that covers several vehicles. They showed a couple in stock the other day.

Edited to add: Garner may be onto something there. You said it was around 8 volts and I'm figuring anything under say 11.5 volts (close to nominal battery) is suspect.
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03-21-2018, 09:31 AM
Post: #14
RE: 95 New Yorker quit running
I would suspect the computer is bad by what you are saying. If I remember correctly, there should be individual wires for each coil. You should be able to test each wire. I am guessing that you will have good voltage on the center wire and low to no voltage on the other 2 wires. Another thing you could try is hooking up the old coil pack. It is unlikely that both coil packs would have the same issue. If it is also only firing on the center coil it would still seem that the computer wasn't telling the other coils to fire.

Sorry I'm not more help. It has been over 10 years since I repaired mine. For some reason I see a green wire with a black tracer and a purple wire???

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Garner

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03-21-2018, 12:27 PM (This post was last modified: 03-21-2018 02:39 PM by Mr.Ed.)
Post: #15
RE: 95 New Yorker quit running
Hopefully find out today, sons friend is bringing his scanner over, fyi, coil pack has a 4 wire plug red, white, black and green with red tracer, green with red tracer is power wire, white, red and black are trigger wires from the ecm, thanks for your input it has helped.
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03-21-2018, 10:16 PM
Post: #16
RE: 95 New Yorker quit running
I don't think that there is a lot that the scanner can do at this point. I think that you are more in the realm of a Multi-meter and test light right now. You could check resistance on the coils to tell if they were good and continuity on the trigger wires to be sure that none are damaged. I think that the trigger wires just supply a ground to each coil. I'm not sure, but I think that you can hook a test light to power, touch it on each trigger wire, and see if it blinks on when cranking the engine. You would likely find the center one blinks and the other two don't because the computer isn't sending the signal or the wires are damaged somewhere.

Please keep filling us in on your progress. This is interesting.

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Garner

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03-21-2018, 10:22 PM
Post: #17
RE: 95 New Yorker quit running
Here's what I got, checked the coil pack it seems to be fine, used a test light on the trigger wires, #1 blinks like it should, #2 stays on constant, #3 no power at all, thinking maybe wires may be melted together, tried that with both computers I got with the same result.
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03-21-2018, 10:30 PM
Post: #18
RE: 95 New Yorker quit running
Sounds like it's time for a pin test all the way back to the ECM end. If your multi-meter doesn't have small enough probes to reach into the plugs you can rig jumper wires with an unfolded paper clip stuck into an alligator type end, or perhaps you can find smaller probe ends. Granger has several types that slip onto standard probe ends so worth the small investment if you do any amount of electrical work. The small probes keep you from damaging the connectors.
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03-23-2018, 05:40 PM
Post: #19
RE: 95 New Yorker quit running
new developments today, finally pulled the front cover off the engine just to check the timing belt, tensioner pulley bearings was completely gone so the belt was loose and skipped several teeth on the crank pulley, why I get a spark in 2 cylinders after that is beyond me, I pulled the top of the covers back awhile ago and the timing marks was lined up on the cam sprockets so I didn't think anything was wrong never would have thought that pulley would go out, will let ya know when I get it back together if it runs or not.
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03-23-2018, 07:34 PM
Post: #20
RE: 95 New Yorker quit running
You get spark because something is "close enough" (sometimes, as things skip around) and that type of ignition will fire cylinders as a pair. As for engine damage, that one does NOT bend valves when the belt goes out so good luck and keep us posted on your progress.
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