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Old 12-22-2020, 05:28 PM   #1
KivPanther
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Default Passenger side cylinders not firing

Well I'm confused as heck. I replaced all the injectors on that side the other day, fired it up, and it ran fine. Try to start this morning and it's sputtering and idling rough. Smells like it's running rich. After a bit of inspection I discover that cylinders 1, 3, and 6 (the ones I just replaced) aren't firing. I'm getting spark from the wires, the injectors I just put in aren't leaking and they ohm out perfectly. Fiddling around in the harness and the connectors are getting continuity where they should. Just finished checking for vacuum leaks and am finding nothing.


I'm scratching my damn head here. Any ideas?
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Old 12-22-2020, 08:06 PM   #2
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Quote:
Originally Posted by KivPanther View Post
I'm scratching my damn head here. Any ideas?
2 things...

- bad wiring? (you were in there, touched something wrong and lost connection) unplug/re-plug connectors, carefully. Only 30+yo!

- leads from the dist? check your plugs for fire? (again?) correct order?


Only on one side, right? ...and it ran before? Hmmmmmmmmm......
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Old 12-22-2020, 08:10 PM   #3
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Only the one side, correct. I've checked and cleaned the connectors for the injectors. You can hear them clicking when the engine idles. I've checked the plug wires and they're definitely getting spark at the plug. I pulled the plugs themselves and, except for being wet with fuel and a bit gunked up because of it, seemed okay. I regapped them and cleaned them just in case. Still won't fire. I pulled apart the entire injector harness, tested the coil and transistor, all within spec. I might just go get a new set of plugs just in case but it seems odd that only that side of the engine would suddenly stop firing.
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Old 12-22-2020, 10:06 PM   #4
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I think I'm in bigger trouble than I thought. Checked and rechecked everything harness-related and still getting good. I did notice that I'm getting puffs of white smoke out of the tailpipe. I checked my oil and it isn't milkshakey, nor am I losing coolant. I guess I should get a compression tester and see if something else is going on. Oy vey.
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Old 12-23-2020, 12:06 AM   #5
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a head gasket wont cause it to not fire.



if you can, when its cold pull the rad cap and start it. if you get some violent bubbles out the radiator like a hot tub, blown HG for sure. if it doesnt smell a TON like raw gasoline at cold idle, the engine is firing. otherwise it will smell like a muscle car when cold. The cat nor any of the sensors are hot enough to do their job and keep the smell down.




EDIT: if you get the violent bubbles its blown betwen the combustion chamber and water jacket. it CAN be blown between cylinders or oil passageway and this radiator cap test will not reveal that.
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Old 12-23-2020, 12:18 AM   #6
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I'm going to do a compression test and see if I can at least rule that out. Also going to see if I can get a noid light and just confirm that I'm hearing the injectors click and not the spark.
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Old 12-23-2020, 04:05 AM   #7
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I'm not familiar with that engine, so just pondering out loud ... is it possible for the intake to be clogged on that side only? E.g., dead squirrel, etc.
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Old 12-23-2020, 03:42 PM   #8
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It’s possible I guess, but since it’s MPI it’s have to plug one intake port, skip one, plug another, skip one, etc. the plenum is in the middle. That and i just had it off to replace injectors so it’s definitely not clogged.
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Old 12-23-2020, 06:25 PM   #9
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On my KA24E, when I replaced its injectors, the new washers/gaskets that seat the injectors' outlets against the engine were too short. So the injectors were not centered on the holes, and thus I had misfires/vacuum leaks. Taller gaskets solved it.
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Old 12-23-2020, 08:20 PM   #10
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Get a NOID light testor at Autozone. Tis in their Loan.a.tool program. Plug it in to ur injector's plug and it will flash if it gets an impulse. If no impulse...no signal to injector. If impulse...bad injectors
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