My 2007 Toyota Tundra w/ over 239k miles doesn’t get up and go like it used to. It starts up and idles quietly and it’s regularly maintained (all fluids and oil changes done timely). Spark plugs, air filters, MAF sensor cleaning, fuel injection service is done.
I have no CEL and it’s hard for me to figure out the problem. I can still get up to speed but it’s slower/sluggish, less responsive overall, passing power not like it used to be. Some days the power is actually pretty decent. Seems like the problem is interment. So far I narrowed it down to these possibilities: clogged catalytic converter, unknown exhaust leak (I don’t hear anything strange), sticking caliper/brakes, a bad sensor.
I narrowed it down to these possibilities: clogged catalytic converter, unknown exhaust leak (I don’t hear anything strange), sticking caliper/brakes, a bad sensor.
good thinking. Scotty has videos about how to test these.
You can measure exhaust backpressure to see if cats are clogged (or just try removing an O2 sensor)
use a thermometer gun to measure rotors to see if brakes are sticking.
at 239k miles the engine could just be showing it's age. A compression test will give you information about that.
I’ll definitely get a compression and back pressure test done. I’m hoping that I don’t have low compression in any cylinder. Despite this weird acceleration issue, it still starts up and idles great.
If you think a caliper is sticking, just feel your rims after driving for a while. They should be about the same temperature, if one is much hotter than the other, that one is likely sticking.
You didn't mention engine air filter.
Have you scanned it and checked the fuel trims?
Yes, I also get the engine air filter replaced as well. Also, what is fuel trims?
It is how much fuel the system is adding or subtracting to make it run right. It can indicate clogged injectors. If the fuel injection service was done, I would think it should be in good shape.
Today I really felt my truck struggling to accelerate. Still no check engine light or codes popping up when I hook it up to a code reader. I hear a hissing/air leak type of noise when I accelerate. I have to drive it hard just to make up the difference for the performance loss.
Today I really felt my truck struggling to accelerate. Still no check engine light or codes popping up when I hook it up to a code reader. I hear a hissing/air leak type of noise when I accelerate. I have to drive it hard just to make up the difference for the performance loss.
I might have a vacuum leak or exhaust manifold leak. Some sort of leak with no CEL. Just performance issues and small hit to fuel economy.
Still no check engine light or codes popping up when I hook it up to a code reader.
Have you checked live data for problems?
I need to get one of those that shows the live data. I used a cheap one but I need to get the other type
Even the cheap scan tools these days can usually display live data. My $50 scanner can even record and graph it.
Looking for codes is just the beginning of the diagnostic process.