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Performed compression test on the culprit cylinder and my friend had me stop cranking at 155PSI and said it was still building. So compression's good. Adjusted valves, still a little clatter at certain RPM but don't think this is causing my misfire; also changed spark plugs after the valve adjustment. New set of plugs made it run "like new" for about a half of a day, really smooth purring revs and no jerking or stuttering on acceleration - then back to the same stuff, clearly a dead/barely firing cylinder. All other cylinder spark plugs appear to have normal combustion, no soot. Cylinder # 3 plug was covered in soot after a single drive to work.
Pulling the spark plug wire from this cylinder with engine running has little/no effect. Pulling the injector above this cylinder seems to change speed of the engine for a second, then it settles back down.
All other cylinders working normally and pulling their plug wires causes engine to misfire even more.
Cylinder # 3 has strong spark as evidenced by a spark tester being hooked up to the wire; additionally, when lowering wire down into cylinder head you can hear the sound of the spark arcing to the plug/walls before its fully inserted onto the plug. So spark is good.
Injectors are cheap rock auto purchases, Ultra Power brand I believe, paid $32 each. Engine has new harness and a fresh manual trans ECM was installed.
Only codes that come up are fuel supply system (comes on when I arrive at work and is generally gone by the time I get back home.) Code 16 fuel injector system, pretty obvious where this one's going, but doesn't come on/stay on unless the cylinder is literally DEAD with no combustion whatsoever for a good while. Also have code 10 IAT, intermittent.
Suspecting the injector over this cylinder I pulled it from the rail; hooked up a handheld pump to the injector's top opening and pushed ATF into the injector. While pushing ATF into the injector used electronic injector pulse tester to command the injector to pulse rapidly. It did so for about 3 seconds then slowed down and clicked quieter. No "spray pattern" or squirting from the injector during this time - only slow drips of ATF.
Is it safe to say this cheap-ass injector is done and just needs to be replaced with a quality reman?
Only other thing I can think to do is move the injector over to the next cylinder and see if this misfire travels.
Any advice or ideas appreciated, thank you!
Pulling the spark plug wire from this cylinder with engine running has little/no effect. Pulling the injector above this cylinder seems to change speed of the engine for a second, then it settles back down.
All other cylinders working normally and pulling their plug wires causes engine to misfire even more.
Cylinder # 3 has strong spark as evidenced by a spark tester being hooked up to the wire; additionally, when lowering wire down into cylinder head you can hear the sound of the spark arcing to the plug/walls before its fully inserted onto the plug. So spark is good.
Injectors are cheap rock auto purchases, Ultra Power brand I believe, paid $32 each. Engine has new harness and a fresh manual trans ECM was installed.
Only codes that come up are fuel supply system (comes on when I arrive at work and is generally gone by the time I get back home.) Code 16 fuel injector system, pretty obvious where this one's going, but doesn't come on/stay on unless the cylinder is literally DEAD with no combustion whatsoever for a good while. Also have code 10 IAT, intermittent.
Suspecting the injector over this cylinder I pulled it from the rail; hooked up a handheld pump to the injector's top opening and pushed ATF into the injector. While pushing ATF into the injector used electronic injector pulse tester to command the injector to pulse rapidly. It did so for about 3 seconds then slowed down and clicked quieter. No "spray pattern" or squirting from the injector during this time - only slow drips of ATF.
Is it safe to say this cheap-ass injector is done and just needs to be replaced with a quality reman?
Only other thing I can think to do is move the injector over to the next cylinder and see if this misfire travels.
Any advice or ideas appreciated, thank you!