Twistedtruck

So I've had this swap done for a while. Now just getting around to try and trouble shoot this issue. So basically at about 2800 on a scanner the truck literally acts like a rev limiter or dropping cylinders. I've swapped out coil packs. Crank sensors. Had it on a scanner and tested about anything on the motor you can think of. All of it looks good. I've recently re downloaded the ewd's off of tis and in the process of double checking the wiring. Off the obd2 port via a real time scanner the computer is stuck in open loop. Also I have about .02V off o2. When you gas it and it starts doing what it does o2 drop to 0 and fuel trim is at 0%. So far nothing looks wrong or not hooked up in wiring. In the very beginning of the swap my buddy was helping and we couldn't understand the pinouts and there was some substantial wire twisting. I'm almost wondering if the ecu could have been fried? Anyhow any help would be appreciated. The motor is a 2000 3.4 out of a runner. Still running the automatic Trans and there aren't any cel that trigger when this happens.

wickedlester

Are you getting a reading from your mass air flow sensor?

Twistedtruck

Yea it was raising with rpm. At this point I haven't received much feedback. I double checked the wiring. Looks correct. I ordered an ecu and should have it in a couple days. Hoping that fixes my issues. I've run out of ideas at this point.

wickedlester

Ok, I had a problem that sounds slightly similar to this one is why I asked. Ended up being the MAF.

Are there any codes being thrown by the ECU?

Might also look into fuel pressure (if ECU isnt problem).

Good luck.

Twistedtruck

Yea I was lucky enough to have an extra 3.4 swap. I swapped maf. Coil packs. Igniter. You name it. The ecu isn't throwing any codes. One thing though. This is a trailered only rig so I don't have the opportunity to really drive cycle it to throw a possible code. I did check fuel pressure. I have great pressure but my volume seems a bit on the low side maybe? Once you evacuate the line (this was all done at my buddy's work with an actual fuel pressure test machine) the pressure drops off very quickly. This issue has been very puzzling to say the least. That's why I ordered an ecu. Least it will be checked off list if it doesn't work.

vital22re

iTrader: (2)

tps could be bad. I've seen this happen a few times when water gets into it.

Twistedtruck

The donor did sit outside my shop in the weather without a hood for most of a winter?? Wouldn't that trigger a cel though?

Twistedtruck

Just called my buddy. On the scan tool it was dead on when we were testing stuff at the shop. Ecu should be here tomorrow. Fingers crossed

89934runr

Are you seeing the O2 sensor switching? is it stuck at .02v?

In open loop your trims are just a display or a calculation (depending on scan tool capability). Your ECM will use a set value for fueling when in open loop regardless of ST or FT trims.

Are you able to see the ignition waveform at those rpms? is the ECM dropping out the cylinders, or are you losing fuel (more of a popping)?

vital22re

iTrader: (2)

Not all the time. I triggered in my buddies truck recently and came back after a few drive cycles. Problem is you're not getting those drive cycles.

Twistedtruck

The o2 didn't seem to switch? They were basically reading .02v at idle and as you accelerate or give it has they drop to 0 when it starts hiccuping hitting a rev limiter. It honestly sounds more like a popping I suppose. Struggling. But it deff stops short of 3k. Yea the whole not getting a drive cycle isn't helping. I'm not sure of the ignition wave form. Other than previously stated nothing even looks out of norm before and during what's happening. It does seem it's running lean though. I've wheeled it like this and occasionally fighting an obstacle shifting gears dealing with my "governor" it's gotten warm/hot a few times.

vital22re

iTrader: (2)

Start with the tps. That should get it running right. Then you can deal with o2

89934runr

By your descriptions, it sounds as if you are going lean.

Twistedtruck

Yea I'm certain it's going lean. Just not sure why. I know I have good fuel pressure. I'll look into the tps some more. Out of all my parts swapping that's only thing I didn't try swapping. According to scanner it's functioning or reading correctly.

89934runr

Any updates?

I'd throw a timing light on there & see if you are losing spark at that RPM (my guess is that you aren't, as your O2s would jump up).

Twistedtruck

So I still haven't resolved my issue. However I've figured a few things out:
So I tried my new ecu. Same deal.
I finally was able to make it throw a code. P1300
Upon investigation it seems that that code more or less means ecu doesn't think truck is running and therefor the injectors aren't adding fuel. So tomorrow I'm going to check the igniter curcuit and see what's up with that. I have swapped igniters before with no change.

Twistedtruck

So far everything checks out with the wiring to igniter. I keep looking at an ecu ground. According to my schematic e14 pin 12 from ecu goes to a connector and grounds to pillar on the runner. (Donor). I have never de pinned any of the plugs and that pin is empty?!? I'm super jesitant to add a pin there and ground it but I just don't know. Any more ideas?? I don't recall running any wires off the ecu plugs to ground. Seems some of the jumpers I've seen have like one wire that you just tag ground for?

wickedlester

There's got to be a wire switched up somewhere..

Your donor was a 2000 4runner correct? I've got some excel spreadsheets I made up for guidance on my swap. Would be glad to share.

What did your ECU come out of? 2000 auto 4runner?

Twistedtruck

Yes. I had a complete sr5 2000 4runner. I have the motor and auto Trans in my 91 22re 5spd truck. The ecu I purchased which does the same thing is exact p/n of my previous ecu. I just swapped igniters with my Tacoma same p/n and truck acts same. However so far it hasn't thrown the p1300 code since the igniter swap. When I originally did the swap I used the vin from runner for tis. This time just used 2000 4runner. They all appear the same. Ecu p/n is 89666-35141. I'm completely lost.

wickedlester

My donor was also a 2000 4runner auto. Here's a spreadsheet I created with 2000 4runner ECU pin outs for you to cross reference with yours. I hope this helps.

https://drive.google.com/file/d/0B1s...it?usp=sharing