2016 1794 Delayed Engine Turnover

Lately I have been having this intermittent delayed turnover when I go to crank the engine. It doesn't only happen in the morning or when its cold or anything like that, it seems pretty random but happens usually every day at some point. Truck has 110k miles and never changed fuel filter, fuel pump or plugs, fyi (never had an issue until now) Also had battery tested and everything seems good. Below is the link to the sound. Anyone have any idea whats going on here? Thanks

https://youtu.be/J8gOGoQuGcQ

 

FF engine? Might need an ethanol reading reset.

 

No, not a Flex Fuel engine, standard 5.7 v8

 

When you say battery tested, just a voltage check or was it load tested? Terminals at the battery tight?

 

spark plugs are past due, get those changed. When was battery replaced? if original, replace it. If it has been replace, check the size. Ive seen people put new batteries in that are too small. Last time air filter changed, is it clean?

Im going to bet on battery/ground. Could also be starter/soleniod or fuel pump starting to go but I would check the other things first.

 

Aren't plugs technically 120k by the book?

*just checked and yes. I can agree that plugs could be a factor, but IMHO, I'd imagine it to be more consistent with other drivability concerns if it were plugs. But, they are cheap enough and he is close enough to at least do them early and see if it helps. Doesnt hurt, thats for sure.

 

Can you just 100% confirm engine code?

FE or FBE

Thanks

 

It's not throwing any check engine light codes

 

Engine code, not faults.

I know you said not FFV, I'd just like to reconfirm.

 

I may be mistaken. Looked in my Manual and it seems like it's an FFV. The code on sticker under hood is 3UR-FBE

 

And that's why I wanted to know. First step, IMO, would be reset ethanol reading.

 

How do I go about doing that. Watched a video about a TSB related to this issue regarding cold starts and the fuel pump. Could this be it?

 

After reading many threads, it appears that more than likely I have the TSB issue. My question is, does getting the ecu flashed or reset typically fix the problem? And if temporarily for how long? Im really not in a position to be paying 1k for a fuel pump replacement right now. How much have you guys out of warranty been paying for the ECU/Pump?

 

Try turning it on but wait 10 seconds then try to crank it over, See if that causes any change in its starting behavior.

 

I tried turning on for 10 seconds and then cranking at it cranked right up first thing in morning but still doing some delayed rough crank middle of day.

 

And just to clarify, the middle of the day also had a 10-second delay before trying to start the engine?

 

Yes, in morning it cranked no delay, mid morning small delay, then just mid day longer delay. I turned ignition to on for 10 secs before turning over each time

 

In case anyone is checking this thread researching the same issue with their truck, I wanted to provide an update. Took the truck to my local independent Toyota shop and he originally diagnosed it as a fuel pump that needed to be replaced, since this was the most obvious thing being that my truck has the Flex Fuel engine. We got the fuel pump replaced and the truck still had the same issues. He then pulled all the injectors and realized I had a couple leaking injectors causing the rough start. Long story short, I swapped out all 8 injectors and have not had an issue since. My mechanic was very surprised this was the problem because these trucks usually don't have issues with the injectors, and actually refunded me the labor on the fuel pump install for incorrectly diagnosing it. Since then, I've also swapped all 8 spark plugs and also ended up doing the timing chains & water pump. Truck has 166k and running strong.

 

Every other person with this issue on here has been able to get it resolved by resetting the alcohol density setting.

https://www.tundras.com/threads/res...ge-level-with-bidirectional-scan-tool.123799/

 

And your point? Obviously, I mentioned this to him. He pulled the injectors and sent me a picture of them, showing a couple of them leaking on a napkin. He even showed me what you're talking about on Tech stream. If what you're saying is true then I would still have issues after changing the injectors, which I did not. Not a fly by night shop, 20 year Toyota independent mechanic, if what you're suggesting is that I got taken advantage of, you're wrong.

 

I guess my point was if a different and much less costly remedy is out there for 99.9% of these scenarios- I’d recommend anyone looking here try that first. Hate seeing people spending money on a solution that doesn’t fix the problem like you initially experienced.

 

LOL doubtful its 99.9%. Most people with issues with their trucks don't even come to online forums to post about them. Were talking about two different issues here, same symptoms, different diagnosis.

 

When i just heard the video , i went straight to a leak down of pressure in the fuel system. It normally stays pressurized for a long time. However, there is a check valve in the pump and if this leakes or one of the injectors leak, the system losses pressure. Many other makers run the pump for a few seconds, to re pressurize the system, but toyota doesn’t do that. Therefore it takes many seconds of cracking to fill it back up. The turn the key on fo 10 sec trick only works with the makers that run the pump at key, on, but not toyota.

while the ethanol %age problem creates long cranking and rough starts, you cannot attribute ALL crank no start issues back to that. There are other causes and this is a good example of one. They replaced the correct parts and problems disappeared. Obviously not an alcohol issue. Kudos to the ops mechanic. He gets it and went to the correct sources and even picked the most likely firt.