What is going on with my truck??? Almost dies when turning....?

[87_SR5]

I am really puzzled with this problem...

Last week I was driving to school, and my route only has one right turn where I don't have to stop. So, approaching the corner, downshifted to 2nd, and then took the corner, powering though it (I think I was late that day ). Right in the middle of the corner, the truck choked and sputtered, like it was about to die....but then smoothed right back out after I exited the corner.

Now I thought that was weird, so on the way home I did it again to see if it would happen (right corner) and it did do it again. One time it happened, it sounded like it back fired a little, if that has anything to do with it....

The funny thing is that I tried turning left the same way (powering through the corner) and I was not able to get it to happen. I don't know if the difference between turning left and right matters but I thought it was weird.

I thought it might have to do with the engine maybe not being at full operating temp, but I was able to do it with normal operating temps.

I thought maybe it was something with the gas sloshing around in the tank, but I had well over half a tank when it first happened.....


I just got done with replacing some parts also...timing chain set, 02 sensor, cap/rotor, plugs/wires, coil, got my TPS adjusted and working.....is there anything else that I should think about replacing? I know I haven't done the fuel filter in a while.....

Any ideas??? I am going to go out and experiment some more and see if I can determine exactly when it happens and if I can get to do it everytime..etc...

'87 SR5 4x4 22-RE 170,000 miles

Other than this problem, the engine runs great...

[jarrodH]

this is just a thought, but on what side of the gas tank is the fuel pump located? Maybe you were kinda low on gas and when you took that turn, all the gas moved to one side of the tank and the pump couldnt suck up enough of it to keep the engine running smoothly?

Also, maybe try to park your truck halfway up on a sidewalk or something, maybe it will have the same effect.

[87_SR5]

Originally Posted by jarrodH

this is just a thought, but on what side of the gas tank is the fuel pump located? Maybe you were kinda low on gas and when you took that turn, all the gas moved to one side of the tank and the pump couldnt suck up enough of it to keep the engine running smoothly?

That is what I first suspected, but I had way over a half tank...actually I think it was right around 3/4 tank. I think the pump is right in the middle of the tank, but I could be wrong.


I don't think that would be possible either. I was going to put a fuel pump kill switch in my truck (a hidden switch, incase someone tries to steal it again...yes, again). I did away with the fuel pump idea and put a kill switch on the ignition. Anyway, what I am getting at is that when I was experimenting with the fuel pump switch....I had the truck running, and then unplugged the wiring harness that goes to the pump (turning off the fuel pump)...and the truck ran for awhile with the fuel pump shut off. So, I can't see the truck being starved of fuel for the amount of time it takes to go around the corner. Kind of see where I am getting at? But I guess it may be possible. I should probably fill up my tank and see if i can get it to do it.

Thanks for the reply

Originally Posted by jarrodH

Also, maybe try to park your truck halfway up on a sidewalk or something, maybe it will have the same effect.

Good idea...

[Tmintx]

Did you change out your fuel filters? Check to make sure you didn't install backwards (check the arrows). I did it once and the same thing happened. Just an idea.

[87_SR5]

Originally Posted by Tmintx

Did you change out your fuel filters? Check to make sure you didn't install backwards (check the arrows). I did it once and the same thing happened. Just an idea.

No, I didn't change out my fuel filter recently....I did do it a long time ago, so it is installed correctly. I just didn't know if a new fuel filter would fix my problem.

I have no idea what is going on....I went out and tried to get it to happen, and it happens sporadically.

I am going to fill up my tank tomorrow and see if it still happens...try to eliminate if it caused by the gas sloshing around in the tank...

When you said 'fuel filterS', is there more than one?

[87_SR5]

I still don't know what is my problem....it is still doing it. I thought I would check for codes just to see...

Came up with Code 6 and 10

Code 6--- RPM NE signal (crank case pulse) to ECU - Missing while engine cranking or NE value over 1000 rpm in spite of missing NE signal.
I got this code before I started doing work on the engine. I was told that once put on my new ignition parts, the code should go away. I replaced cap/rotor, plug/wires, and coil....and I still get the code. So I don't know why I still have this code.


Code 10--- Starter signal to ECU - missing when vehicle stopped and engine running over 800 rpm.

Here is a new code I have never had before. I don't what it means or if it is related to my problem.



I am going to clear the codes and see if they come back up again.

[alltrac165]

Dunno about the codes, but there are vacuum lines to the power steering pump. Maybe a vacuum leak in there somewhere? Pretty small lines, not sure of their effect at various throttle openings...

[87_SR5]

Well, kind of an update here....

I cleared the codes and they haven't come back...I think they may have been there from when I had them before...

I think my problem lies within the gas tank...I have been taking it easy around corners, but every once in a while it will happen. Doesn't happen at all when I have a full tank, but once it starts to get low it happens.

Today, I was coasting around a corner (right turn, clutch in), and the engine died completely. This has never happened before. I finished the corner and started it right back up. Right now I have around a 1/4 tank, maybe less.

Does anyone think there is something wrong here? Or is this just the way it is going to be...

Any more input to add?

Thanks

[qsd-dan]

Some of your symptoms matched mine when my fuel pump finally gave out. Mine went out at 161,000, which is about 10,000 less than what you have now. Other possiblities related to the fuel tank to check are the fuel pressure, gas cap for proper pressure and operation, and charcol canister for proper operation - particularly the purge valve. Also check the fuel pressure regulator. The way I was taught to test this bugger was to pull the vacuum line off of it while the motor was running and make sure no fuel pukes out. Might be worth checking the fuel pump relay, but your symptoms don't seem to point in that direction. I'll post anything else that comes to mind. Please post your results when you find the problem.

[woundedfate]

Just a long shot, but have you checked for wires that could be grounding out during the movment of cornering?

[87_SR5]

Originally Posted by woundedfate

Just a long shot, but have you checked for wires that could be grounding out during the movment of cornering?

I don't know if that would be such a long shot. Yesterday, it happened again. This time, my tank if over half, and I was taking the corner (right) not fast at all....not as quick as when it happened before. It didn't die, but it stumbled pretty good.

I remember reading a couple post that talked about some wiring that was cut through by the sharp edges of the intake. I have been searching but cannot find it. I am still looking. I don't remember the exact problem that was being caused by these grounding wires, but it is a possibility I guess.

Thing is though I don't have any problems when going over rough roads or bumps.

If anyone can come up with that thread, that would be great. I am still searching...


------------------------
Found the post that I was looking for: http://www.toyotanation.com/forum/t14957.html

Originally Posted by sball

I found it! I will also post this as a new post for I think others may have the same problem. The wiring harness that runs under the intake between intake and injection assembly rests on the assembly. Apparently over time the vibration wore through the wrapping and insulation exposing wire. The harness was arcing to the assembly thus creating a short to the ignition. It had actually pitted the metal over time yet was hidden by the harness. I wrapped it and problem was solved. This is probably a common occurence for this is the factory routing for this harness.

I don't know if this would be my problem, but if there were wires grounding out, I would guess this would be the spot...