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

A friend bought a first gen Tundra right after I bought my SR5. He mentioned that he was getting 17-19mpg and I remember him remarking that it was what the Tacoma 4's were getting. Pissed me clean off. He showed me his fuel sheets at work and it was getting that,,as per company fueling station printout and his mileage stats.

I was after a Tundra initially,,until I heard the Sequoia suv was getting the V8 first, then the Tundras, which is how it played out in this area. About a year later the Tundras made it to the dealerships around here.

Every once in awhile I will see a forest green first gen Tundra,,and slowly watch it pass by with a tear forming,,(sniffle).

 

Me, too. That's what color mine was.

 

I used my Toyota pickups to haul gravel and building materials without a problem...however, I think that you had some combined failure mechanisms going on, and putting a heavy load on the engine didn't help.

 

I agree, that's what I meant to say. I think the heavy load hauling just tipped the scales too far on some underlying issue.

You ever get your 4Runner back?

 

The 4Runner is still stitting semiabandoned up against the RR tracks. I should go down and chat with them tomorrow...

As for hauling heavt stuff, I often use the 68 Dodge. It took me months to get all the bugs out after I rebult that motor...

Howard

 

Any updates?

Later

KO

 

Possibly, but I don't see that. And I live in the mountains, never any freeway driving, hardly any flat ground driving. I have a 2014, 5.7, 4x4, double cab, SR5.

In the coldest part of the winter the mileage did go down, mainly do to the winter mix ethanol "shit" gas.

Now I am back to about 16.6-17.2 mpg. With the still winter mix, of gas. This gas around here won't even run in a chainsaw. I work on them every week.

Oh sure I could probably get 13-14 no problem; if I kept my foot in the accelerator. The 5.7 doesn't need to be driven like my Tacoma; the 5.7 really, really pulls at low rpm. I just leave the transmission in Drive.

If I am getting that mpg in the mountains; others have to be getting better, in flatter places.

 

I got to disagree with you there. I live in one of the flatware states. On the other hand, my best recorded mpg was driving the mountains of North Carolina. Other Tundra owners have recorded the anomoly. The only thing I v
Can think is the Tundra gets much, much better economy going down hill, but doesn't struggle going up the hills. I dunno?

 

Certainly driving habits have a lot to do with mpg.

 

The rest need to toss those chicken bones out from behind the jump seat,,then the mileage goes up. Savvy?. I have a few I could toss out.

NIB, off of the showroom floor weight,,no mods, no gears, no tires, no canopy's, no trailers, ect and ect.

WTF?,,my mileage is great now and a big return of power!!!.

Funny how that works, for some.

Jen has the right idea with the Civic, A little mommy missile that gets old Subaru mileage.

 

Nothing. I'm bummed, I was really hoping to hear something. I wonder if he tried the MAF? Or ECU or igniter? Really kind of dying to find out. And I took new O2s down there a couple weeks ago, and I'm now trying to decide whether to ask him to install them no matter what or return them to RA. If I knew for sure we'd be keeping the truck FOR SURE 100%, I'd do them regardless of whether they helped the starting prob or not. But why dump another $100 in parts if no one can ever diagnose/repair the problem, meaning I wouldn't keep the truck?

That's the scariest part of all - was reading a different TW thread the other day, about quite a few people who have 2.4 or 2.7 engines or something and they had the same hot start issue. Some of them sounded like they'd been trying to solve it for YEARS. I won't do it. That was the first time it occurred to me that maybe NO ONE will ever be able to diagnose and repair this. EVER. That would suck.

I won't keep that truck unless that problem is diagnosed correctly and repaired correctly. Partly because unless we know it's cause, then we really can't say for sure what potential damage it might be doing or how safe it is to continue using it without the issue fixed. But mostly because I know if we kept it without the issue solved and just kept driving it like that, I'd never ever be able to think of anything else besides trying to solve the mystery - and that would be pure torture!!

 

Bummer. Was hoping for good news.
KO

 

must be the thin air or something but that's very strange that you are saying your getting better mileage then Toyota claims as the best mileage the truck can get.

how can you be getting better then the best mpg they claim it gets when manufacturers always claim to have better mileage then you actually get?

I don't think Toyota would be plastering best possible gas mileages of 13 mpg if it could do more then that so something about your conditions must be making this happen.

there is something very strange about your situation and if you get 17 mpg from a 2014 tundra then you should easily be getting 30+ mpg from your first gen taco

 

If you buy a new full sized go Ford. That Coyote V8 gets great mileage and is proving to be extremely reliable. Ford is light years ahead of the competition when it comes to what they are putting in their trucks. I help run a small fleet at work, and Ford has been by far the best truck for us over the last 7 years.

My company got rid of the Tundra's due to their high operating costs. The things seem to demand new gas every few hundred km's no matter who drove them and honestly nothing about the power they put out was special. If you want power a Ford Ecoboost will stomp all over a 5.7L Tundra. It simply gets the power better to the pavement in a more capable truck as far as towing, hauling, and running around town is concerned.

 

How are you coming up with ypur numbers? Just curious if your dividing miles by gallons on fill ups or using a factory computer for it.

 

I devide miles by gallons. Surprisingly enough, the dash computer is within a 1/2 mpg of what I calculate. I fill up at the same station and pump to get my numbers.

 

We had one on our sienna and it lied like a step child...
It always said 19+ mpg and in the 20's on the interstate. By calculating at the pump I was seeing 15-16 around town and 17-18 on the interstate. I got rid of it after only 6 months.

 

jen, have you heard anything from the mechanic recently?

 

Stopped by the mechanic's this morning, to pick up O2s we'd ordered Rock Auto. We'd bought them back when we were thinking maybe they played a part, but now the deadline to return them is here and since it doesn't seem like they play a part, we're gonna return them.

Our mechanic tried swapping the igniter, but no change. Has not done ECU yet, still doesn't think that's it but may try it eventually for lack of better idea. Was going to swap MAF today. Fingers crossed. Not holding breath anymore though. Too many disappointments.

I was wrong in a recent post, when I said he noted the fuel pump not getting enough voltage during hard starts. What he ACTUALLY said was that the starter signal circuit was only getting 9ish volts, whereas everything else was getting 11 volts at that same moment, so that seemed a little off to him. Although since the problem only occurs when the hood is down, it seemed strange to him that it could be an issue with the COR, since it's inside the cab. He has another Toyota truck there now that he's working on, and was going to see if the circuit opening relay was the same one to try it out. But that truck has a different engine and is older, so I'm thinking it won't be the same.

So I told him I'd check on my end too, to see if anyone on TW *might* happen to have an identical truck that just happens to have a circuit opening relay that is not currently in use to try the ol' known good part angle on the COR stuff.

 

Bama - what would we be trying to find out if we were to do that last paragraph of what you said about energizing the pump manually? Would that prove something one way or the other in terms of the circuit opening relay's function?