Head gasket not sealing between the two? Sounds plausible.

 

ehatch - aren't all the plugs removed during a compression test? Since they should be removed, seems like the only cylinder that will develop any pressure is the one cylinder you are testing, which means that if there is a leak between 2 cylinders, wouldn't you read lower pressure rather than higher?

I'm no expert, ehatch sounds like he has some experience but that explanation confuses me.

space-junk - don't lose hope. You've done a tremendous amount of work in a short time here, I think the end is in sight, you will get there.

 

i have always just pulled one plug at a time. Good point though, i don't know how he originally tested it.

 

all plugs were out when testing. also, plugs were swapped between cylinders, so if there was a contact issue, wouldnt it have followed the plug?

 

Sorry to hear it's keeping you head scratching.

 

Ok all plugs were out so that eliminates that. Did you happen to have the throttle wide open?

i only ask repetitively because the more info we have the better.

 

negative, but does that really make a big difference? i mean, 130 is where they are supposed to be. 119 and 121 are a little low. but that aside, wont the motor pull air around the butterfly?

 

Btw, here's the pics from last night.

 

Did you check the egr valve is not stuck in an (slightly) open position?

 

That would cause a misfire in just cylinder 2?

 

No, it will cause a big vac leak and make it run like crap if it runs at all. I experienced it on a celica once after i just reinstalled the engine and didnt know the status of the egr valve i used.

 

Is your mechanical timing one tooth off? For some reason i thought it was supposed to be slightly left of the very center, yours looks slightly right. Pictures can be deceiving though.

i looked at 4 crawlers page, his appears slightly left, i remember mine was as well. Although i had .010 mild from the head and block so. 020 in total

 

I went through everything again. Injector 2 is not firing again. Spark plug is wet. Only thing I can assume is that the CSI is pouring fuel into the cylinder. I don't get it. We tested the injector before and it was pulsing. I've heard it ticking myself with the stethoscope. So, what, check the wiring harness to see if the factory splice is broken and intermittently touching?

 

If is electrical, simply unplugging the csi would fix it.

If the csi is leaking and not sealing, you can remove it from the intake, reattach it outside the intake to the fuel line, and jumper the fuel pump to see if it starts pouring fuel.

 

Potentially useless memory: Some years ago there was an issue with a 3rd gen 3.4 injector. Would work fine, then it wouldn't. Guy sent all his injectors to Witch Doctor iirc, tested out fine, reinstalled and got the same results. I can't remember if it went into a new position, but I believe that was what happened. Turned out to get an intermittent problem with the injector itself.

 

That was my thought as well.

 

I dont think the CSI is the issue. what i was trying to say in my sleep deprived state was that while thee injector isnt firing, the plug is still wet, so the CSI is probably causing that by shooting fuel into the cylinder. at least thats what i assume.

that is a fantastic idea, however, ive rotated these injectors and spark plugs several times. misfire is ALWAYS on 2. except that 1 time it was on 3 as well, but that cleared up somehow.

in the pictures, they were taken at 0* TDC. these trucks are timed at 5* BTDC. thats probably why youre seeing it off a bit.

 

im almost 100% certain that the issue is in the wiring harness. what else would explain the fact that i got 2 god tests out of the harness but misfire when its connected. ive been researching wiring diagrams all night. because the ECU on these trucks batch fires the injectors, i think i need to cut the loom down looking for a bad splice. Ive got the wiring diagrams and pictures, so i think ill be ok. kinda frustrated i have to strip the intake off again, but at least i can do it in about 15 minutes now.

also, side update, since i didnt know where to go with the misfire last night, i switched gears to pulling out the COR since its not working. the PO had moved it so the only way i could get to it was to remove the passenger side speaker(it was junk anyways) and reach my big paws through that little opening. Every tab is bisted off the COR except 1 and the bolt that secures it to the cab was only 2 threads in. so, ill be ordering a new one today. luckily, even though toyota no longer carries it, Denso still makes that part and its only about $40. the other thing we got to was removing the door panels off of the doors from the parts truck. got new door switches that we need to install from it into the runner since the runners are busted and wont control the passenger window correctly. Doomy came up with an ingenious plan to use stained glass paint to refurb the courtesy light on the door panel. we will get to that eventually. the main thing is that it got the door off of the tailgate of the truck where its been living for the past month and i closed the tailgate giving me more room to walk around the truck.

 

My injector harness was really corroded where it split to go to 2 and 3, might be worth a look

 

Second that. That splice is under/near the intake -extreme conditions - so it could get corroded/brittle.