2018 TRD Off-road won’t start. My experience

So I’m making this thread for anyone that is having the same problem or problems.
2018 off-road LB with 36000 miles. 4x4

truck was running fine when I got home had about 20 miles to empty ( I do run my truck to about 20 miles till empty before I fill up and I do this quite often).

I go to start it up and the next day and real rough idle and I thought it was due to having low gas and as soon as I go to back up and put it into gear it stutters and dies. I had a gas tank so I put about 2 gallons in, but still nothing. I looked up ways to see how to prime fuel pump on a 3rd gen and couldn’t find much if anything.

My next plan was to maybe put gas in the throttle body to atleast run it long enough to purge out air in the gas line. After multiple attempts to get it to run on its own I finally got it to run and think it’s fixed until I get a rough idle again ( let it idle for about 10 mins) I rev the motor and it wouldn’t go past 2k rpms it was like it was a rev limiter. And would cut out at WOT

I soon get a rough motor and assume I’m having a misfire, I pull the codes and it’s giving P0087 P0300 P0171 and P0174. I look up the codes and see that it could be a CPS sensor. I have a 2018 so it should be the updated part but it was giving all the other symptoms for me to point it to that. I replace the part and still nothing so now I’m at a loss and had to tow it to my local dealership.

Yes I’ve had the fuel pump recall done and any recalls that are available.

It won’t get looked at till Monday but I will update this thread just in case anyone has had a similar problem or currently going through the same thing.

 

Good luck, please keep us posted. Hopefully nothing too detrimental.

 

Sounds like you damaged the fuel pump .running close to empty can potentially damage the fuel pump . Never go under 1/4 tank is your safest route .

 

Maybe a little water was in your tank?

 

There’s a recall on the fuel pump. I’d start there.

 

Sounds maybe like some bad gas? Throw in some gas treatment and see how she runs.

 

I agree sounds like bad gas. I guess you will find out when you go to the Dealer. Let us know.

 

Is the high pressure fuel delivery used on start up and idle? If so, it’s probably like trying to prime a diesel. Which can be a PIA.

 

The pump has fuel going right thru it, motor everything that is what keeps it cool not from fuel surrounding it. When it runs out of gas it and the truck come to stop.

 

OP said he's already had that done

 

I'm sure running it at 20 miles until empty didn't help, but at that point there should still be roughly 3 gallons in the tank which should be plenty for the fuel pickup to get some fuel. However it's still not a good idea to regularly run it that low.

For those who don't want to Google it, p0087 is fuel rail pressure is too low. P0171 and p0174 are both indicating it is running too lean (one code for each bank). P0300 is random/multiple cylinder misfire. Given that there are no other p030X codes it means we can conclude that it is likely a random misfire on multiple cylinders and not just a multiple cylinder misfire on 2 or more of the same cylinders.

In conclusion the obvious thing is that there is a fuel delivery issue. The fact that simply adding more gas didn't fix the issue tells me that it probably has something to do with a fuel pump and the fact that you could idle it for a while and never clear up the issue tells me it is likely not simply air being trapped in the lines. I believe these engines have two, a high and a low pressure fuel pump. But before we simply replace those, have you checked fuses? When you cycle the engine can you (or someone else) hear the fuel pump(s) working?

 

missed where he said that.

 

From what I've seen using techstream, hot idle is port injection unless the DI cleaning cycle is active. Then you'll obviously see a switch to direct injection for the duration of that cycle.
IIRC, cold startup involves a combo of both injection methods for a few seconds, something about stratification of the fuel (it's either in the new features document for the 2GR-FKS or the SM, not sure which).
This assumes a stock calibration, or a tune in which idle has not been altered!

 

RedWings44 is right on. P0087 is the key, a fuel delivery issue. The other codes are due to the fuel loss. As a lifetime Ford drivability technician I always offer this simple diagnostic advice to narrow down fuel or ignition running issues : If you can duplicate the running issue spray some Berryman B-12 into the intake. If issues improve or go away its not ignition related. If it does not improve it's not fuel related. Here's a perfect example. My Son's EFI Bronco would not start after a couple of years in storage. I verified spark and could here the fuel pump spin on. I suspected stuck injectors. I sprayed some throttle body cleaner down the intake (I was out of B-12). It fired and died. I blocked the throttle open a bit and continuously sprayed 6 cans through the intake. It ran like normal and finally started running to rich as the injectors slowly unstuck. Your issue may be covered under a vehicles 5/50 emission warranty. Let us know.

 

From what I read the fuel pump won’t prime until it reads some sort of idle or rpms, I checked all the fuses I could and all looked fine I’ll update everyone when I get an answer back. And yes I know I run my truck on e too much so it could have burned up a fuel pump since the fuel keeps it cool. I know it’s a fuel delivery problem because it has spark and can run on its own.

I can’t hear a fuel pump running at all the only thing I can hear is the brakes priming like master cylinder and can feel it in the brake pedal

 

It would probably be easier to listen for the pumps with two people. But as they mentioned in another comment, the high pressure fuel pump is responsible for idle and I believe it is also responsible for high power applications due to the direct injection kicking in. My opinion is that this the more likely culprit, but that's just a guess.

 

That’s foolishness. He said 20 miles to empty, which is actually plenty left in the tank. The pump was not in jeopardy. I have guesses from Honda experiences, but I’m not sure if those items exist on my taco. Interested to hear what really happened.

 

I just got a call back from Toyota and thought I would let you all know what happened. They said they were running everything they could until finally they decided to replace the fuel pump with an old pump that was removed from a Tacoma due to the recall and they said it ran just fine and had zero problems so they’re assumption as of right now is the fuel pump and they are going to replace it under warranty with a new part that would be under the recall.

although it does seem odd to me that a maybe 2 month old “new fuel pump” due to recall has gone bad already so I hope no one else comes across this problem after getting the new fuel pump. I know it could have been a “once in a blue moon” type of thing. But I will not go under a 1/4 tank from here on out if that was the case.

They also want to run a few more tests to see if that was actually the problem but I am curious if that’s honest from the dealer or if they want some money….

 

Don’t panic. I too had the recall done and have several times run into the warning, including down to the “please refuel”. Here is an entire thread where the myth is debunked. Toyota built in a cushion on purpose. https://www.tacomaworld.com/threads/how-far-below-e-can-you-go.724657/

 

More than likely some shit the techs fucked up while meddling in there. Running your tank bone dry a few times WILL NOT damage a fuel pump. Stop repeating this urban myth people. It's not a thing