Surging/Thrusting Problem Under Acceleration

You asked that already, though I did reply with pvc instead of pcv.
But yes....tested per fsm.

 

Yeah that's true. Getting schedules to align is a little difficult though. I'm at quarter end this month so my work schedule is more hectic than normal.

I will say though, this has been the first time I've really REALLY missed the bay area. I could have called in favors from like 4 different guys and started swapping parts and probably would have had this fucking problem nipped in the ass already and it would have only cost me beer and bad jokes.

 

Truck has to be under load for the symptoms to occur, so yes.
Intake is all the same. Factory airbox, tube, and filter. Hell I even pulled the filter out all together for a test drive to see if it made a difference...it didn't.

 

Why didn't anyone tell me to pop the hood on my tundra? I just checked and the FPR has an identical bolt pattern, diameter, and according to the Tundra FSM, the same fuel pressure regulating requirements as the 5vz. Just the angle of the fuel and vacuum lines are slightly different, but i think it'll work as a test.

As for blowing my brains out, while I don't claim to be a mechanic, but both my parents were. And I just hate the idea of having to take it somewhere else. It's a mental hurdle. My dad was a mechanic my entire life and my parents used to own a mom and pop auto shop. I was doing tune ups and helping out around the shop when I was 10 thru junior high.
My dad is probably rolling over in his grave right now. I actually had a lengthy conversation with my mom about the truck last night going over everything. She interrogated me left and right about what I've done so far and my findings. She did mention the engine coolant temperature (ECT) sensor also plays into engine management and something I haven't touched as far as measuring resistance. Hell I still have an extra one on the shelf from the old engine.

I didn't! I skipped it when I chased the red herring A/F sensor.
I'll do it today sometime.

 

I GIVE UP!

I pulled the FPR from the Tundra. Was a perfect fit except the fuel nipple for the return line was on top of the head so I flipped the whole FPR upside down for a quick test and it worked. Put everything back together and same fucking surge. If anything more noticeable. Seriously, I give up.

Power brake under same scenario (rpm/gear/etc) also causes surging.

 

Temp gauge is normal. Cold when cold, warm when warm, nothing funny.

I have an OBDII tool that I run on my computer that I can monitor basic crap and can see open/closed loop. It's bluetooth so it doesn't update the fastest, but it doesn't show it switching between open/closed loop. Just shows closed loop during the surge.

 

It's definitely surging. I've been through my share of of clutches on different vehicles.

 

And whatever other effing sensors affect engine/fuel management.....
And I don't believe the filter is the issue at all. Perhaps if I was still forced induction, maybe. But the fact I'm back to NA...who cares if the filter is slightly more restrictive than the Denso filter. That and...this is a new problem that has happened with two filters, and I had the old filter for quite some time without issue.

 

So I did a little yelping for a mechanic. Found a guy that had good reviews, and all the bad reviews was because the customer said the guy was cocky, arrogant, and generally a prick...sounds a bit like me so what the hell...figure I would drop in unannounced.

Drove over to where the shop was supposed to be at...but no shop. Called the number and spoke to the owner, Karl. Cheeky British bastard on the phone. Ask where they were located and he responded back with "Why do you want to know that...do you have an appointment?" Told him no, but wanted to talk to him about a problem with my Tacoma. His response was (use best British accent) "Toyota Tacoma? Bloody fantastic truck. Come on over," and gives me the new address.

So I drive over, explain the situation. He goes over everything in his head. Runs inside and grabs some fancy ass OBDII scan tool and starts my truck. Runs thru some checks or something revs the throttle slowly a few times and then tells me it feels like it's missing a little bit and I must be getting absolute shit gas mileage (which I am...more than normal) and he bets the front coil is weak. Hops out and says, and I quote, "I love your truck, you're insufferable, but I love your truck. Call me tomorrow at lunch time and I'll think about it some more and let you know if I have any other ideas." No charge.

Soooooooooo that's where we're at. I really want to borrow someone's coils before I spend $75/coil.