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No power to ignition coil; No power to ignition coil
Topic Started: Feb 1 2012, 06:22 PM (4,612 Views)
Vaultgirl
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Yesterday the Snail loss power while driving :O, 3cyl auto, checked fuel pump, ok checked fuel line gas coming out, checked ignition coil, no power constantly to it or with with ignition turned on. :hmm Any suggestions?
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crankcase


Check for a bad fuse (IG fuse, 20Amp). This fuse protects many other things, so you should see other symptoms as well. For no voltage going to the low voltage side of the coil (BLK/WHT wire), the fuse would be the first thing to check.
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Bad Bent
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Facetious Educated Donkey

If it's inconsistent then I'd also suspect a loss of ground or a bad wire connection with possible bad wires. Have the battery tested. If you haven't changed the battery post wire clamps to real ones I'd recommend it.

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Vaultgirl
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Thanks for the replies. Checked ALL fuses and connections especially the throttle body(clean it),battery connections good and clean(changed clamps when I got it), still no power to the ignition coil. Error code was giving me a 32 pressure sensor. I cleaned it with seafoam spray cleaner, no more 32 code- I get the 12 code now even after cranking. Car cranks but will not start. Any ideas will be very appreciated! I'm driving Behemoth (Suburban) and its making my wallet cry!
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crankcase


I wonder if you could have lost your timing belt? If the snail died quick and quiet that could be what happened. That will make you loose fire. Undo the oil cap, and look in while someone cranks, and look for movement=good. Another way, if you have no helper, is to pull the dist. cap, note where the rotor is, and see if it move when you crank.

I don't think the timing belt would cause no power on the low side of the coil, but I just thought I would mention it.
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Vaultgirl
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Timing belt still on:/
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crankcase


Assuming testing is as described. With no voltage to low side of coil and IG fuse is good, then something is loading down the line, the line could be open, or corrosion is causing a voltage drop or providing a path to ground. One of these scenarios is almost certainly what is happening

The IG fuse is hot all the time and also in the start position. This line powers the coil. There are several other systems powered from this line power also. If it were me, I would pull the fuse and do a continuity check from the non-powered side of the fuse socket to the coil. An open=trace and repair, good continuity=find offending system sucking up all the voltage.

I am looking at the FSM for a 92. It shows the IG line also goes to:
S105 (seat belt controller, duel pressure switch, ac amp)
S106 (FI relay, fuel pump relay)
S107 (generator, fan thermostat switch, auto transaxle control module, auto transaxle diag. connector)
S108 (coil, noise suppressor condenser)

S205 (daytime running lights {Canadian}, instrument cluster {LSI & XFI models}


You could look to see if any of these systems are affected, or it is just the coil.
Edited by crankcase, Feb 4 2012, 10:01 AM.
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Vaultgirl
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Thank you CC for the info. I found the connector to the coil was bad replaced it but when the ignition is turned on I get zero voltage at the coil. But when the wiring is disconnected from the coil it only gets 5 volts. So I do have a power draw from somewhere else, I will check what you have listed.
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Kaydon
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I can only offer an my opinion but I had the same thing happen and it was my ECM. Chased it for a couple of days and grabbed another ECM out of a parts car...Viola!!!
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Vaultgirl
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Update: Replaced ECM with the same results :banghead ....so here is a short clip of trying to start The Snail...the crankshaft will not turn while the starter is working....any ideas?





http://imageshack.us/clip/my-videos/848/f29.mp4/
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poorman1


Your crankshaft IS turning !
If the crankshaft "pulley" is not turning you have a broken key or crank
If the crankshaft pulley is turning remove oil cap and see if cam is turning
If cam is not turning you have a broken belt
Edited by poorman1, Feb 25 2012, 01:37 PM.
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Jittney
Anchorage 92 XFi

Edit: Ahhh...my bad!
Not thinking.
Edited by Jittney, Feb 25 2012, 01:43 PM.
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Vaultgirl
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poorman1
Feb 25 2012, 01:35 PM
Your crankshaft IS turning !
If the crankshaft "pulley" is not turning you have a broken key or crank
If the crankshaft pulley is turning remove oil cap and see if cam is turning
If cam is not turning you have a broken belt
I've the Snail back running!! :banana It WAS the crankshaft key! Pulled gear off and noting but rust.
Hoping to get her on the road next month!
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Memphis metro


GeoMetroDuo
Feb 25 2012, 01:17 PM
Update: Replaced ECM with the same results :banghead ....so here is a short clip of trying to start The Snail...the crankshaft will not turn while the starter is working....any ideas?





http://imageshack.us/clip/my-videos/848/f29.mp4/
Another situation of replacing a computer that does not need to be. It amazes me how often this is done even from supposedly reputable repair shops!
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