Engine misfire, and I have no hair to pull out. (1 Viewer)

[Equinsu ocha]

Agreed, it SHOULD be all cylinders, but maybe 5 and 6 are already running rich or those injectors are being problematic.

If 5 and 6 are dumping more fuel, it could be they have a bare ground wire.

Remember, Toyota switches the GROUND side of the load and not the HOT side of the load, so, if there is a failure to ground, it's on all the time.

Cool man. Thanks. I’ll jut go through all the wiring I can find to see if there’s anything. So frustrating.

 

[inkpot]

Have you run a compression test on all 6 cylinders? #6 is not too bad if you pull the 4 mounting bolts from the heater valve and wiring harness cover just above it. I am currently helping rebuild a head due to leaky valves. Have done this once before due to a leaky valve on my own engine. Head gasket was fine both times.

 

[Equinsu ocha]

Would the valve make it idle rough instantly, or would it be something that gradually got bad? My rig started running rough like a plug wire came off, or an injector was malfunctioning.

 

[Equinsu ocha]

I haven’t run a compression test. I’ll do that after I put it back together without an issue found.

 

[Equinsu ocha]

So, I may have found my issue. I hooked my power probe up to injector #6. Grounded one end and went to supply power to the other, and it would only activate the solenoid occasionally. After a hundred or so connection attempts, it activated consistently. Injectors are on their way, and my fingers are crossed.

 

[Equinsu ocha]

Injectors weren’t the problem. I guess next step is to run a compression test. Eff me, right?

 

[Jeff Elliott]

Have you verified 1) with a mechanic's stethoscope that all injectors are ticking and 2) that you have spark to the cylinder(s) in question? If so, then I'd run the compression test but better would be a leak down test if you have / can borrow the equipment.

 

[Equinsu ocha]

Cylinder 5 & 6 are dead on the compression test. Heads coming off.

 

[BILT4ME]

Cylinder 5 & 6 are dead on the compression test. Heads coming off.

I'm sorry for your loss!

 

[Biggreener]

Bummer man. Sounds like you should put an LS into it

 

[Equinsu ocha]

Bummer man. Sounds like you should put an LS into it

I’d love to, but think I’d rather keep it as close to stock as I can.

 

[Jeff Elliott]

Sorry to hear that Bro... We had all hoped for a simpler solution.

 

[Equinsu ocha]

Sorry to hear that Bro... We had all hoped for a simpler solution.

Me too man. I haven’t even gotten the title from the place I bought it from, yet. I’m pissed.

 

[NorCalFJ100]

Just throwing this out there....along with compression maybe do a leak down test as well. I think you'll get the full picture of any potential issues.

 

[Equinsu ocha]

Just throwing this out there....along with compression maybe do a leak down test as well. I think you'll get the full picture of any potential issues.

I think I’ll just pull the head and check it out. When I have the gauge in 5 or 6, I can hear the pressure coming out the other plug hole.

 

[NorCalFJ100]

I think I’ll just pull the head and check it out. When I have the gauge in 5 or 6, I can hear the pressure coming out the other plug hole.

The leak down will show you where it's leaking from without all the work to remove the head. FWIW...