Misfires

Tiny
JC-842
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  • 181 POSTS
All the valve springs are working and the lifter's are all working.
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Thursday, August 12th, 2021 AT 12:01 PM
Tiny
ASEMASTER6371
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When you get it together, remove 1 plug. Start the engine with the compression gauge in the cylinder and tell me the running compression.

Roy
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Thursday, August 12th, 2021 AT 2:15 PM
Tiny
JC-842
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Okay, that won't be today but I think I found the problem. I'm sure it's the PCM the middle pin on the coil connector should be the ground right?
So connecting a test light to positive battery terminal and test light to middle pin of connector and spinning over the engine my test light should blink on off. But it doesn't. I tried it on every one of my coil connectors not just number four and it doesn't blink on any of them. I'm trying to figure out how to test the wire itself from the coil to the PCM pins but I'm not sure how that's done exactly. I have to put the cover back on before I can start it up.
I guess.
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Thursday, August 12th, 2021 AT 2:27 PM
Tiny
JC-842
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Roy, I started it up and number one cylinder is 150 and bounced around a little over 150.
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Thursday, August 12th, 2021 AT 2:51 PM
Tiny
ASEMASTER6371
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My wiring diagram shows 2 wires on the coils.

Roy
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Thursday, August 12th, 2021 AT 2:54 PM
Tiny
ASEMASTER6371
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Can you verify the 2 coils and the 3 wires?

Roy
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Thursday, August 12th, 2021 AT 3:07 PM
Tiny
JC-842
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  • 181 POSTS
That's correct the brown being the hot and the blue striped wire which is the middle pin on the coil connector when a test light is applied with power from positive side of battery with engine turning over is supposed to cause the test light to blink. But it shows no power at all. Was the running compression test okay?
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Thursday, August 12th, 2021 AT 3:07 PM
Tiny
ASEMASTER6371
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Put the test light on the negative side and probe the blue stripped wire.

Roy
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Thursday, August 12th, 2021 AT 3:10 PM
Tiny
JC-842
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  • 181 POSTS
Ignition on or off?
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Thursday, August 12th, 2021 AT 3:24 PM
Tiny
ASEMASTER6371
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Ignition on.

Roy
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Thursday, August 12th, 2021 AT 3:27 PM
Tiny
JC-842
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  • 181 POSTS
Thanks Roy there's nothing at all. Only the brown wire is active.
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Thursday, August 12th, 2021 AT 3:31 PM
Tiny
ASEMASTER6371
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Okay, is the connector on the coil? Make sure it is then check the blue wire for power. Then start it up and see if the light flashes.

Roy
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Thursday, August 12th, 2021 AT 3:45 PM
Tiny
JC-842
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The blue wire is connected yes I tried the test on each one of the connectors.
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Thursday, August 12th, 2021 AT 3:50 PM
Tiny
JC-842
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  • 181 POSTS
Okay Roy, with engine running testing to blue wire and positive battery terminal light comes on steady and does not blink. That's on all cylinders. Then hooked light to ground side of battery and no light at all.
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Thursday, August 12th, 2021 AT 4:02 PM
Tiny
JC-842
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  • 181 POSTS
Just found something odd. Number one coil does not light up at all so the brown wire will light up but not the blue green wire.
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Thursday, August 12th, 2021 AT 4:09 PM
Tiny
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Then the coil is bad. It is not passing current.

Roy
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Thursday, August 12th, 2021 AT 4:20 PM
Tiny
JC-842
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  • 181 POSTS
I tested unhooked in and hooked to the coil if the plug is not connected to the coil it shouldn't matter should it. No current is getting to the coil it s the way I'm looking at it. If I'm wrong I'll try another coil but why are none of the other connection blinking like they should be?
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Thursday, August 12th, 2021 AT 4:34 PM
Tiny
ASEMASTER6371
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It must be hooked up to the coil for this test. Is the brown wire hot with battery voltage?

Roy
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Thursday, August 12th, 2021 AT 4:36 PM
Tiny
JC-842
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  • 181 POSTS
Yes it was. But I pulled the plug from the cylinder left it plugged to the coil and the plug was firing. I changed the coil to a coil I know to be good and installed the plug it's firing and the brown wire is hot but nothing on the blue wire.
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Thursday, August 12th, 2021 AT 4:48 PM
Tiny
ASEMASTER6371
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That is because it is grounded by the ECM.

Roy
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Thursday, August 12th, 2021 AT 4:57 PM

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