Engine bog, then stalling at stop signs, now engine won't start

Smiley52

New member
This is going to be way longer than I thought it could be. I'm sorry, please don't kill me. There's a TL;DR at the bottom.

Alright guys, I searched a few threads, but nothing seemed to fit with what was happening. I'm on TacomaWorld with the same username, but just recently (a year ago) got into 4runners, not much experience with the 3.4 as this is the first time I've had it.
I bought a 96, 3.4 auto, 4wd about a month ago. It seemed to be running pretty good, bought it in Orlando and drove it home which was about an hour. No overheating issues or anything, cv axes still intact, the only thing was there was a whine coming from the engine. My initial thought was alternator-had it tested, and it passed with flying colors. Didn't sound like a power steering pump. (And I wish it was a supercharger, but no). So I searched, and found it *could* be the torque converter, but I didn't really believe that was it. I checked all the pulleys, nothing seemed out of whack.
Fast forward, a couple weeks ago my ac fan belt started squeaking, and I thought the pulley may have been the cause of the whine from before. So I figured I could deal with the squeak for a couple weeks (stupid me) while I work on other things and then I'll change it when I get some time.
Fast Forward again to last Thursday- I have the day off, and I'm going camping in Gainesville Florida with some friends for the weekend so I want to go get the RTT I've been planning on getting for a while, from Miami, which is about 3 hours away. I start the drive down there, about 20 minutes in, my fan belt breaks. Fine, no worries, I can ride without ac. Some time later, traveling about 70, I try to pass somebody so I hit the gas, engine bogs down after a downshift. Strange... so I let it slowly accelerate, no bog. I get to Miami, make my purchase, leave from Geo Overland Gear(great stuff, Ander is a good dude), start my trek back to my hometown so I can set up the tent. In traffic, engine stalls at a stop sign. Hmph, that's weird. Stalls again. uhhh.... okay. Keep my foot on the gas so the engine can't stall from low rpms. Research a bit and I see torque converter may be an issue again. So I think okay, that's fine, I'll buy one and put it in when I get home. Stop and go traffic on the Florida Turnpike, I keep stalling and restarting in traffic. then one time it doesn't fire up, I sit on the side of the road for a few hours trying to get it to start, but nothings working. Check codes while not running, I see a code for cam position sensor, talk to a buddy, he says that might be whats messed up. So I fiddle with it, unplug, replug, get no difference. Somehow after a couple hours, got it to start, still bogging, rpms all over the place, get a mile down the road, stall out. Try to restart, nothing. Tow to autozone, replace Cam position sensor, still nothing. Tow home-$550.

TL;DR-
truck bogging down, stalls at stop signs, now won't start.


So what am I lookin at? I'm thinking torque converter. I don't think it's a fuel issue, but it could be. Not throwing any codes/can't get it started to figure out what codes it might throw.
 
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The torque converter won't cause a no start. Sounds like a fuel filter or bad gas issue to me.

I thought the same thing, but i read it on the Internet so it has to be true, right? Lol
I'm just trying to think of all possible reasons. Thanks for the response.
 
I have not checked spark yet, i will when i get home.



These are the steps:

Prove you have spark.

If you do fuel is next. On a Toy the fuel pressure is harder to prove. Because there is no test port. Spraying starter fluid in the throttle body will help troubleshoot the fuel part.


Sent from my iPhone using Tapatalk
 
These are the steps:

Prove you have spark.

If you do fuel is next. On a Toy the fuel pressure is harder to prove. Because there is no test port. Spraying starter fluid in the throttle body will help troubleshoot the fuel part.


Sent from my iPhone using Tapatalk
I did spray starting fluid, and it didn't start, but i don't want to rule that out because of that test.
 
These are the steps:

Prove you have spark.

If you do fuel is next. On a Toy the fuel pressure is harder to prove. Because there is no test port. Spraying starter fluid in the throttle body will help troubleshoot the fuel part.


Sent from my iPhone using Tapatalk

Just checked, looks like I'm not getting any spark.
 
Anyone know what would cause me to loose spark whole driving? Or to stall at stop signs, then make your vehicle not run?
 
The crank sensor or ICM may be.

Someone can chime in if they know which sensor controls spark. (Crank or Cam)


Sent from my iPhone using Tapatalk
 
[MENTION=10169]TheDurk[/MENTION]

One of the members here that seems to have any electrical diagram you'll ever need. Useful guy to have around. I'm sure he'll chime in here shortly.
 
[MENTION=10169]TheDurk[/MENTION]

One of the members here that seems to have any electrical diagram you'll ever need. Useful guy to have around. I'm sure he'll chime in here shortly.
I hope so! [MENTION=10169]TheDurk[/MENTION] can you help me?

Sent from my SAMSUNG-SM-G890A using Tapatalk
 
I hope so! [MENTION=10169]TheDurk[/MENTION] can you help me?

Sent from my SAMSUNG-SM-G890A using Tapatalk

Maybe. Cam Position Sensor can definitely cause spark issues. Even with new part, circuit can have issues. Crankshaft Position Sensor can, too. Look at this stuff:

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/di/eg5vzfe/cip0340.pdf

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/ig5vzfe/ignsy/ovi.pdf

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/di/eg5vzfe/cip0335.pdf

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/ig5vzfe/crps/insp.pdf

You really need to tell us what year you have before you get a circuit diagram. Things change along the way. Where did you get your new sensor?

Since your rig is new to you, you may want to rule out any possibility of a loose crank bolt. This can lead to intermittent spark issues. Unlikely, but it can be disastrous if left to go too far. Check for any sign of wobbling on the main crank pulley.
 
Last edited:
Maybe. Cam Position Sensor can definitely cause spark issues. Even with new part, circuit can have issues. Crankshaft Position Sensor can, too. Look at this stuff:

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/di/eg5vzfe/cip0340.pdf

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/ig5vzfe/ignsy/ovi.pdf

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/di/eg5vzfe/cip0335.pdf

http://tacoma.site40.net/4Runner_96-02_Repair&Wiring/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/024runne/ig5vzfe/crps/insp.pdf

You really need to tell us what year you have before you get a circuit diagram. Things change along the way. Where did you get your new sensor?

Since your rig is new to you, you may want to rule out any possibility of a loose crank bolt. This can lead to intermittent spark issues. Unlikely, but it can be disastrous if left to go too far. Check for any sign of wobbling on the main crank pulley.

Woohoo! He came through! Thank you for the links sir!
I mentioned it in the first post, I have a 96. I got the new cam sensor from autozone. Not particularly sure what the brand was, my brother picked it up for me as I was stuck on the side of the road.
Thanks a bunch, I will check it out in the morning!
 
[MENTION=10169]TheDurk[/MENTION]

One of the members here that seems to have any electrical diagram you'll ever need. Useful guy to have around. I'm sure he'll chime in here shortly.

And he swapped his frame!!!! And says he wouldn't recommend anyone go through that again! Unless I'm misquoting him!!! A legend!!!
 

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