2004 tacoma 3.4

engine trouble falls on its face during acceleration need help please

 

Check spark, fuel delivery, then air fuel metering.

Could be lots of things..... any codes?

 

change spark plugs clean mass air flow sensor and throttle body and replaced fuel filter yesterday still acting up and getting worse at first i thought my foot was hitting the floor board but it kept happening the only way to pull out of the problem is to floor it

 

no codes

 

Tps? Or idle air control valve? How did the old spark plugs look?

 

they looked fine other than worn down from spark on both sides.

 

any other info about the truck, turbo, super charger, any mods?

have you been off roading recently?

I assume you checked the air filter

 

Clean the throttle body and mass airflow sensor first.

 

No engine upgrades only icon suspension but haven't been off road lately today I cleaned the throttle body had a little bit of resin but I don't think that's my problem will drive to work tomorrow and see. My next check will be fuel pressure test. Any suggestions on wear to get tsp or aic sensors

 

I had a problem with what I called throttle lag. Sounds like what you may be seeing. The fix was simple turned out to be the TPS had a flat spot worn in the potentiometer and didnt cost anything to fix. With the engine off pump the throttle from no throttle to full throttle 100 times. It will wipe the TPS potentiometer clean. Here is a link

https://www.tacomaworld.com/threads/cant-figure-this-hick-up-out.168680/

 

I don't have an issue, but a quick question. Do you have to have the ignition on with the engine off?

 

Off

This procedure exercises the TPS pot, the concept is you normally run the engine most of the time in a narrow RPM range. So this wears a narrow spot on the poteniometer (sp) at this throttle position. The computer reads this position and does not recognize this throttle position. Moving the throttle 100 times (with engine off) smooths out the worn spot and the position can be recognized.

My truck was doing this at ~92,000 mi and I did the pumping the throttle (with the engine off ) and throttle lag stopped and I now have 133,000 with no repeat of the throttle lag