SOLVED! Post 2853 Leaking Injectors, Dealer Techs Rock! Extended Cranking after Engine Swap 3.4L 5vz

well you are supposed to have a little vapor lock, that's why when you remove the cap to put gas in you hear it suck in some air. this is pollution control to keep gas fumes from escaping into the air to kill polar bears or something so this train of thought means its involving the charcoal canister as well since its connected to the tank venting system.

not having any suction triggers a CEL and this will happen if you have a bad fuel filler hose or gas tank seal or leave the gas cap loose or if its bad

so too much or too little vapor lock is bad and causes issues as well as triggers a CEL

I don't know a lot about this system but I do know I saw a few threads where after a lot of trouble shooting, the canister was the problem for the CEL codes.

 

I found this for you, there is one right there in Oregon and the prices are the same at all the stores so since Oregon store didn't show prices I got this link from a different store.

its a great salvage place to find anything you might ever need at very good prices http://www.lkqpickyourpart.com/locations/LKQ_Self_Service_-_Baton_Rouge-175/prices/

 

I know, I've read threads about quite a few Toyota truck owners with issues similar to ours finding (after a long and frustrating process) that they had a bad canister. Hmmm.......

 

Thanks Keakar. That place is like 3 hours away on the other side of Mt Hood, but it was still helpful because it reminded me of another one I heard about when this all started.......I think maybe the 2 places used to be one business, then split up or something. Anyway, this one's in Portland, so it could be an option! Thanks

http://www.fosterauto.com/about.html

 

at the link I gave you, it only costs $7.50 for a fuel canister so if you just want to swap one out just to see if that's it, all it takes is a little time to go get it.

as for the one near you I would confirm its the same prices and setup, since they don't advertise it with the other stores it may be where they go to the other place and take the parts off and charge you more. it is curious why they seam different and use different web pages and all. maybe they just bought into the franchise name?

 

"When the engine is OPERATING AT HIGH SPEEDS OR UNDER HEAVY LOADS, the ECM turns off the fuel pump control relay. The relay switches to contact A and the current to the fuel pump flows directly to the pump bypassing the resistor, causing the fuel pump to run at a high speed. The fuel pump also runs at high speed WHILE THE ENGINE IS STARTING."

Is it saying it could be as simple as a bad EFI relay under the hood? Or that our ECM is short a few brain cells? Or neither?

You guys are making me nervous as to why no one is commenting on this. Is it because you don't know either, or because you don't want to say "I think your Taco's brain is scrambled"?

Nobody? Mod? Thoughts? Please?

 

I will put this out there, it sounds as simple as that IF you have full power getting to the pump. if for some reason, like bad wires or faulty connection to the pump then it may not be getting correct voltage to the pump.

this is why your "real" mechanic is rechecking everything to be sure. he isn't a parts changer like many "so called" mechanics are so he wants to solve the problem not just throw parts at it.

yes swapping relays is an easy way to see if that's it but your guy knows this so let him do his thing. im sure the relay was one of the first thing he checked.

 

If it's the part I bolded, would that mean replace fuel sender gauge and lead wire also, or back to ECU's brain is on cocaine?

OK, I am getting nervous. Our new mechanic was going to repeat his pressure test yesterday afternoon to confirm the pump, then call me back. He does NOT seem like someone that would just get busy or blow off calling - I'm thinking he wanted to see how it fired up super cold this AM, but now it's nearly 10am and I'm thinking he's realizing it's not the pump. He knew I was gathering parts pricing to be ready to order it locally today - he would call the second he was certain it was the pump, to tell me to order. Crap.

You were right Koditten, on waiting to celebrate. I always do that - react first, think later. My husband didn't totally flip when I first told him the news yesterday, and I didn't understand why at the time. At least one of us keeps a level head.......

Good news is, I KNOW this mechanic will see us through to whatever the next step may be.....so not completely flipping out, only mildly....

EDIT: Couldn't stop myself - just left a message on mechanic's voice mail. Seriously doubting it's as simple as the pump now guys - I can tell this guy doesn't mess around and he would have called by now to tell me to order parts if it was that. At least I'm confident he'll help us through whatever comes next, and for a reasonable price.....I think I'm going to do some housework and try to stop fixating on the unknown for a bit here, and wait to hear from him.....will share updates the second I get them....

 

breathe ......

take deep breathes

im sure he is just dealing with something else at the moment, I doubt his whole world is wrapped up in working on your truck to the exclusion of everything else so take a chill pill girl and relax.

if it were me working on it I would wait until I had a definite final result of exactly whats wrong before I called you. or he may be taking apart and fixing the problem right now and isn't thinking of giving you instant play by play updates. he may have the gas tank in his hand right now instead of the telephone.

 

He does have one other Tacoma he's working on right now, but ours and that one are it. We could be way worse off though, we could be the owners of the other one -

That one was completely underwater somewhere in a hurricane! It's a 2010 Taco with only 40K, and apparently it's appearance is mint. His friend bought it, and he said he wishes his buddy would have talked to him about it first, cuz he would have told him NOT to do it! Neighbor was telling us that truck's E brake line rusted up, so he's replacing that, and all the sensors keep malfunctioning - sounds like a total nightmare. Imagine how obsessed I'd be if THAT was our truck. Good grief, I really wouldn't sleep! But the fact that this guy is taking on a project like that and even making some progress with it proves to me he's up for the challenges our Taco presents. Although it is a bit disturbing to think that we're now in the same category as that one, as far as the level of mechanic skill we need!

I'm sure he'll call today with some sort of info.....

Maybe I should do some baking! And turn on some Waylon!

 

Wow, just now saw this thread for the first time. So out the window goes my old skewl philosophy "don't worry about spark plugs as long as they are firing".

 

Just be glad your truck is making progress...We dropped off the 90 4Runner at the shop in mid December, and they got some seals and gaskets changed, now it won't start, and it has been pushed to a dirt lot behind the shop, by the old Clinchfield RR tracks.

I stopped in to chat with the guy yesterday (he just got done, again, on my buddies 87 Land Cruiser). It is time to split the main engine electrical harness with a razor blade and find the bad wire He will bring in a buddy who is a specialist on those sorts of things.

So we wait, the SIL drives our 08 Wrangler Sahara instead...

Howard

 

Oh good grief. Sorry man. That really sucks. Yep, the waiting is tough. Especially with no back up vehicle. On one hand, it's fortunate that I'm not working right now, since I'm without a vehicle til the Taco is fixed. On the other hand, I gotta start a job hunt fairly soon here to handle the Taco bills!

Happy place. Happy place. Going to my happy place now. Cookies and Waylon. WILL NOT TOUCH MY PHONE TIL IT RINGS.

 

Generic BS again, not really applicable to your rig.
The pump is on or off and has one speed. It runs continuously while the engine is running. All fuel management is done by the ECM regulating the injectors. That being said, the type of electric motor used in the fuel pump can start running erratically near the end of it's life. Faster, slower, not at all, then maybe just fine for a while. Remember that the ECM assumes a set fuel pressure and issues its commands accordingly. Of course all electrical connections, the condition/function of EFI and CO relay and associated wiring also play a part in fuel pump "quality of life".
The text in the FSM page in post 617 details part of this (starting mode) and the simplified "fuel pump control" diagram BamaToy put up shows that the pump only gets power or not, nothing variable, no other controls.
I already mentioned (with picture) how any influence on the running of the engine form the EVAP/charcoal canister system could be bypassed by removing and plugging 1 hose.

Patience is a virtue, let the man work and you might consider having him take a look at the wheel bearing issue. It shouldn't take more than 10 minutes. I have not followed all of the thread so I don't know if that has been diagnosed for sure.

 

Thank you DP.

Will review post 617 - that is sounding familiar about the pump either being on or off, period.

And yes, I remember now too about your tip to plug the hose to the canister. Now of course kind of wishing we'd done that. We did talk about it, but honestly there were plenty of things we considered checking and would chicken out, because it's all connected to something we just spent that much $ on. I think my husband will probably even be paranoid to do oil changes for a while (something he's done since he was a kid)!

I agree w/you about the wheel bearing too, we actually talked about that this morning and were planning to ask him to take a look. Would be nice to cross that off ASAP, since it could turn into a safety issue, unlike tired shocks and struts. Those can definitely wait til summer.

Thanks for the continued input! Although I'm missing your smart ass title today - where's my false hope for the day heading? Gotta keep laughing through this stuff, gimme some jokes guys!

 

Well, luckily we have backup vehicles, we even had to put the 68 Dodge Utilline pickup, headers, holley, glasspacks, and such, into daily service last summer, but that was due tendon surgery and the inability to drive stick...And having to get a job to fix a vehicle is terrible.

Best of luck on this one.

 

Here's a short diversion. Just had a check engine and 2 other system warning lights come on on our 08 4runner. You think your truck is complex.
It was solved by a new gas cap and an hour at the marriage counselor.

 

The wife got a CEL due to a loose fuel cap last week on the WRX while I was out of town. I had to explain where in the shop the code reader was and how to clear the code.

But no need for counseling, it happened last September also.

Howard

 

OK, I know you said the terminal layout is for a 99, but the other diagrams - are those definitely for my truck's make/model/year, or might they be different too? And all of this stuff is part of the computer (the ECU) right? Which is located behind the glovebox? And what's the difference between the ECU and ECM? The ECU stands for engine control unit, right? What's ECM stand for? Is ECM engine control module? How are the two related?

 

OK, got an update.....