RKTonyC
Member
- Messages
- 15
- Location
- Saugus, Ma
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Jeepwalker
Well-Known Member
- Messages
- 975
- Location
- WI
Ever check inside your tk's throttle body for carbon build-up around the butterfly valve, and behind it? Only takes a very small amt to throw things off. It's an easy routine maintenance item that is often overlooked. Happened to me. If there are build-ups, Clean with some TB cleaner and a solvent-safe brush.
I think after I bought mine, some dork who put the rubber intake boot on, had it folded under the clamp at the throttle body. So basically it wasn't sealing very well, and a small amount of un-metered air was getting sucked into the throttle body. Easy fix. Might look into that. Only takes a couple min to undo and check it out. Also, make sure you don't have any vacuum leaks. Make sure your engine grounds are real good.
I think after I bought mine, some dork who put the rubber intake boot on, had it folded under the clamp at the throttle body. So basically it wasn't sealing very well, and a small amount of un-metered air was getting sucked into the throttle body. Easy fix. Might look into that. Only takes a couple min to undo and check it out. Also, make sure you don't have any vacuum leaks. Make sure your engine grounds are real good.
RKTonyC
Member
- Messages
- 15
- Location
- Saugus, Ma
Thanks, I’ll check that. I’ve only had it a couple months, also I’m just now digging into it. I’m loving all the info and education I’m getting.
I kinda figured if the misfire was the plug, it wouldn’t clear up after a minute driving.
I kinda figured if the misfire was the plug, it wouldn’t clear up after a minute driving.
Jeepwalker
Well-Known Member
- Messages
- 975
- Location
- WI
Does your scanner allow for real-time misfire counter? Might want to see what's happening. Could be the plug/coil or even compression. You might want to check compression ...esp on the #3 or #4 cylinders (esp #3) to see where things stand. And throw an oil pressure gauge on the engine.
What happens on these engines, is the oil pressure goes low, oil doesn't squirt under the pistons like it should. Cylinder temp goes up, and exh valve gets burnt. Center cylinder often. Not saying that's your issue, hopefully not. But it happens. Mine has all that. Lower compression on #3. Oil pressure is a hearty 11 psi at lowest idle (24 going down the road). My engine's misfire counts go up. If they go up past a certain threshold ...I forget what that is right now, it'll light off the C-E light. But it doesn't put it into limp mode. Mine's usually slightly under the threshold. Probably been like that for who knows how many years??! 5-6? Again, probably something else...but worth check them out if need be.
The solution when ya have that condition is to pull engine, install new bearings and oil pump kit. Replace the affected valve/s. If it weren't for the few weaknesses these engines could go forever.
What happens on these engines, is the oil pressure goes low, oil doesn't squirt under the pistons like it should. Cylinder temp goes up, and exh valve gets burnt. Center cylinder often. Not saying that's your issue, hopefully not. But it happens. Mine has all that. Lower compression on #3. Oil pressure is a hearty 11 psi at lowest idle (24 going down the road). My engine's misfire counts go up. If they go up past a certain threshold ...I forget what that is right now, it'll light off the C-E light. But it doesn't put it into limp mode. Mine's usually slightly under the threshold. Probably been like that for who knows how many years??! 5-6? Again, probably something else...but worth check them out if need be.
The solution when ya have that condition is to pull engine, install new bearings and oil pump kit. Replace the affected valve/s. If it weren't for the few weaknesses these engines could go forever.
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