Experiencing power loss and shifting issues

Hello, i have a 2015 tacoma 4.0 with automatic transmission and i have been experiencing power loss when accelerating especialy when driving up hill, has been shifting alittle diferent i had my mechanic check it out he doesnt think anything is wrong with transmission, and my fuel mileage is poor. If anyone has experienced this or has suggestions on fix please reply. Thank you

 

Id start by cleaning the MAF and throttle body. Make sure you use the MAF specific cleaner for the MAF

More info here
https://www.tacomaworld.com/threads/how-to-throttle-body-cleaning-2005-v6.94203/

 

Also, welcome aboard! Hopefully someone here can help you get this sorted

 

Mileage? Are you current on maintenance (spark plugs, air filter, engine oil and atf fluid changes).

 

Milkshake color substance where coolant should be? Feel any exhaust coming out of your oil filler neck when removing the cap? Some cheap ways to see if you have blown head or valve train problems. Anything more would need further diagnostics (leak down or compression test)

 

68,000 miles serviced every 5000 all fluids are good. Just put a new air filter in it and i have cleaned the throttle body and maf sensor my fuel mileage increased alittle bit but thats it, im going to test the tps and pedal sensor tomorrow with multimeter.

 

No CEL?

 

No check engine light or error codes stored?

Silly question, parking brake is fully released? Brake shoe self adjusters aren’t over tightened? If it’s been awhile since the plugs were replaced, remove one & check the gap.

 

Yeah dude. Before you start going gung ho on items at 68,000 miles you may want to check for codes first.

If nothing then you may want to start with the basics. Spark, and fuel delivery, if both of those test out more than okay then you move onto air delivery.

If you have access to a scanner that can give you proper PID data I would strongly suggest checking the short and long term fuel trims and report those back.

All of this being said, my money is on a defective POS fuel pump.

 

no check engine light, and i have never replaced plugs. Im gonna take it up to autozone i guess and see if they can find anything. I notice throttle response is very poor when driving in city i continuously have to push accelerator pedal farther and farther down for it to actually react and speed up. Thank you for responses

 

Spark plugs are recommended every 30,000 miles. Even if it's not the issue (which it very well could be) I'd replace them with a fresh set of copper plugs from the dealer or these Denso plugs

 

I noticed 5% improvement in MPG from new plugs. Another 5% after doing rear diff oil, transfer oil, front diff oil, and trans oil. Another few percent from changing my front wheel bearings.

 

AH HA! I'm in agreement with stickyTaco. I did mine awhile back. Holy crap, how did it still start and run with a gap that huge.

 

I will look into replacing spark plugs this weekend, does anybody have a link to a video on how to do this on the 4.0 tacoma. Thank you for replies

I also scan the truck for codes and it didnt have any present

 

Take the coils off. Hit each plug with a hammer and break the white part in half. Put all the new plugs in the gas tank.

Just kiddin. Don’t do that.

Search the stickies. I’m sure it’s there. I blow the area the old plug is in with an air blow gun to get any dirt that may have settled down there before removing the plug. I like to center and gap each new plug. Put them in with anti seize on the threads. The one on the drivers side rear is tricky. Search and you’ll find instructions how to do it.

Once you’ve mastered the ability to search, you’ll find debates on to torque to spec or not. Use anti seize or not.

 

Ever figure out the problem?

 

OP hasn't been seen since Oct '21.

Don't hold your breath for an answer.