tacoma no power, misfiring, hesitating

truck always ran great. one day started up and drove off as usual and the problem was immediately present. i checked the timing and cleaned the maf and it made no difference. fast forward to today and i started truck and drove off. up until i got up to speed and drove a little the truck drove as it should but it started acting up again. 5 minutes later and i had to bring truck home it ran so bad.

in this video at the start you can hear a loud backfire. i keep the gas steady up until i put my signal on but the rpms fluctuate the whole time. going up the street im at about 3/4 throttle. not shown but idling, reving at idle, and wot dont show these symptoms. got any ideas before i get my hands on a scanner?


https://youtu.be/Abfv9txTgs0

 

I'd say check the Air filter just in case it's contributing factor.The air filter by itself won't do this. Next the MAP/MAF sensor, Check resistance of Plug wires (arcing) coil pack or fuel filter plugged. Sounds like weak spark or not enough fuel. Possibly bad injectors or cracked vacuum line.

 

CEL?

 

the gas guage looks like your out of gas

 

Sounds like a coil went out.

 

cel was on previously because im not running a cat. i haven't scanned it since symptoms

 

You might have some "New" codes for your current problem.

 

low but not out.

 

hope so. the scanner i ordered isnt compatible with the truck. cant buy one in town so i have to order another. that could take some time though

 

running the gas tank that low on E(under 1/4 of a tank)can greatly effect the fuel pump causing it to over heat and fail

 

I didnt realize there was a compatibility issue?

 

needs a scanner compatible with J1850 VPW OBD protocol.

 

how old is the TPS

if original, get OEM and replace it asap

bad tps does all sorts of fuckery


however....that thing sounds like ARSE!

no cat...can't be clogged then

 

oh this is for the prior to 96 OBD?

 

anything you buy today will be VPW compatible. even 20 dollar ebay cheapies

 

would scan as misfire p030[x] right ?

 

Not true, just a wives tale.


I'm not even sure what engine we're dealing with, you never said. Sounds like a v6 though.

 

I used to run my 98 Tacoma to the low light all the time...never had a problem

 

Get a fuel pressure gauge on there asap. Sounds like a failing fuel pump to me. Also a failing MAF would account for the strange behavior, but you really need to make sure you've got appropriate fuel pressure 43.5psig. Autozone kit comes with a banjo bolt adapter and then tape the gauge to the windshield. And yes it sucks to put the banjo adapter on.

 

the fuel pump is located inside the gas tank and uses the gas in the tank to cool the pump, when you run your car/truck constantly under 1\4 tank or worse on E the pump can over heat and fail, how do I know this it happened to my truck in my Signature picture I was running it on E all the time and the pump failed it was a costly mistake had to remove the gas tank and replace the pump when it kicked out and died.Also in the OPs case having such a low level of gas can starve the engine when going around turns or uphill can cut off the gas supply to the fuel pickup tube causing such behavior as he stated, possibly