I've been contemplating different plugs; def on the new engine. I'm at the 400-430 rwhp range and thought that was mild enough to stay with the UR5s. I've done HGs before and I'm sure I'll do them again, someday at least if not real soon. Thanks for chiming in. Hopefully I'll get to it in the next couple of weeks. I still think it's spark though. It makes no leaking noises when running and the dead cylinder is just moving air as kidglok mentioned and causing the other 5 to go rich to keep the overall at 14.7 AFR. It sure seems like it anyway. I'll use the water test if I can't get the infrared from my dad.
Running on 5 cyls?
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I've been contemplating different plugs; def on the new engine. I'm at the 400-430 rwhp range and thought that was mild enough to stay with the UR5s. I've done HGs before and I'm sure I'll do them again, someday at least if not real soon. Thanks for chiming in. Hopefully I'll get to it in the next couple of weeks. I still think it's spark though. It makes no leaking noises when running and the dead cylinder is just moving air as kidglok mentioned and causing the other 5 to go rich to keep the overall at 14.7 AFR. It sure seems like it anyway. I'll use the water test if I can't get the infrared from my dad.
The TR6 is a heck of a unit and that gap has worked great for me for cruise and racing. Not saying the plugs didn't still deteriorate my HG. Even if I did have a HG let go, there's a good 20k miles and 50+ passes on this set so that's not all bad! I use my car pretty hard.
Do you have a powerlogger? A lot of times when spark is failing (bad coil pack or spark plug/wires) it will show as random lean spikes on the narrowband log.
No PL; I know, I know. I'm old school in that regard. I like FI but I'm not big on having a laptop in car. I've always just kept my tune away from edgy. We'll see though. If it is a HG, then I'll be thinking PL, but I'll probably wait and switch to the new SD chip Bob and Eric are working on now and do it all at once with 80's instead of my 60's I run now.
My first thought is that you have no power to one injector or you have one bad injector. Squirt some water on the exhaust tubes to find the cold exhaust pipe. Then,switch that injector with another one. If the problem moves,it's the injector . If it doesn't move, check continuity of the wires from the injector harness on the dead cylinder to their appropriate terminals on the computer. It would be a good idea to look at the dead cylinder's spark plug first and test to see if it sparks.
Have you ever replaced the injector harness?
Have you ever replaced the injector harness?
Stock injector harness. Time for Casper's maybe. I will try the swap test though if one is dead. Thank you!
The most common way for the harness to fail is caused buy excessive heat from the egr. It usually causes number one cylinder to get too much fuel. It doesn't sound like that is what is going on in your case.
Interesting. I'm going to put my EGR block off plate on while I'm in there this time too.
TurboTdr3.8
Well-Known Member
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Any update on this one yet ?
I'll be switching to this style next go around.
Update: It's number 2 that's dead. I'm pulling the plug later but the water test on the headers showed it right away. If the plug looks good, I'll check spark, and if that's good, I'll have to figure out if it's the injector and then possible the injector harness.
At least number 2 isn't that hard to get to!
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That's what I said when I saw it was still wet! I'm like, at least it wasn't #6. I HATE that plug.
If it is a plug problem I hope you're not only going to change that one plug?
If it is a plug, I'll be doing more than just replacing all the plugs.
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Still need to pull the plug, I know, I'm so far behind in my personal life right now. Question even before that though; what are the chances an injector driver went bad? I have an extra ecm but I never tested it before the car had problems. Anyone ever had this happen? Or is it more likely the injector itself, assuming it's not ignition.
I'm sure it's possible but try not to get too far ahead of yourself, these cars are stressful enough lol
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750H.P.V6
Brutal 6 Racing
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- Sep 4, 2001
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I'd say there's a slim chance it's the injector or the driver. It's more likely that it would be the injector harness if it's related to fuel delivery. I'd just pull the plug and do a compression test on the #2 cylinder to isolate whether or not you have a mechanical problem. Maybe it's not a headgasket and you broke a rocker shaft instead. That is a pretty common failure.
Neal
Bad coil. I had two dead cylinders when I thought only one. Not even a year on that GM coil. I use the 4.3l Silverado coil with the tr6 box. I should have it wrapped up tomorrow. Dual fans took a few hours to put in, so I'm told. A buddy is doing the work as I was not getting to it.
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