jharriet

i just bought a 91 4runner 2.2re that wasnt running at the time.
i figured it was the fuel pump but after changing that its the same issue, the truck will start and idle for like 10 seconds but when gas is applied it dies, there is no fuel leaks, fuel pump works and i changed fuel filter. The fuel pump goes up to 10.5 volts when the truck is idles but its idleing at like 500rpm..

the truck would run while spraying gas into the intake, which i did in order to drive it onto the trailer but then it backfired and now it will not try to turn over, im assuming that i blew a relay.

any suggestions or input is greatly appriciated. its my first yota!

jharriet

i also changed the mass airflow sensor, dizzy cap and rotor button. & it has newer plugs and wires

combatcarl

Well..if your fuel pump has 10.5 volts at idle, what's your battery putting out with no loads, key off? If its under 12, charge it and try again. At idle you should have at least 12.5 to 13 volts in the whole system. Even at that point, it still isn't enough power to really work right. Probably a battery/charging system issue...

myyota

Just so you know, your truck has a 22RE, not a 2.2re.
Your truck does not have a mass air flow sensor, it has an AFM. They are two totally different parts.

Otherwise welcome to the board, and good luck with your truck.

jharriet

sorry my yota buddy called it a mass airflow sensor, but hes a hillbilly haha i mean the sensor on the intake. it had a dead battery but i just put another one in today it reads 12.0, still same problem.

jharriet

so ill try and find an alternator for it, i had it boosted off my chev for most tries. the fuel pump gets 0 volts untill i turn over the motor and then it gradually gets up to 10-11v before the truck dies. isnt the fuel pump supposed to have power when on acc?

jharriet

also does anybody know what might have blown from spraying gas in the intake. it was one large backfire and now it wont tryto start.

myyota

The fuel pump wont get any power until the engine starts cranking, the door inside the AFM has to open to send power to the fuel pump.

You shouldn`t have blown anything by spraying gas into the intake. Try checking the ignition fuse and EFI fuse in the fuse box in the cab. check the fuses with a meter, because sometimes they can look good but be bad.

combatcarl

Spraying gas into the intake may have caused a flooded condition, wetting your spark plugs, and slowing ignition. Pull em, gap em, and let it sit overnight, see if it helps. Might chase the wires back to the pump, ensure they aren't grounded or corroded anywhere.
When you say backfired, did it come out the intake, or the exhaust? An afterfire is raw fuel being ignited in the exhaust, a backfire is raw fuel burning off in the intake. Backfiring could be caused by bad valve timing, leaving one open on a compression/ignition cycle.

jharriet

It blew off the hose to the intake box. Ill check the plugs this morning and make sure all the fuses are good and get back

jharriet

narrowed it to the igniton fuse which keeps blowing, even when useing a 25a. so there is obviously a short somewere but it goes right into a harness.

jharriet

So ive decided to rewire the ignition to a push button start since i cant figure out were the short is, and was thinking about wireing the fuel pump to a switch since the existing wires are corroded i believe. Does anybody see a poblem in doing this? If so please speak up and let me know!

jharriet

For the ignition first of all. The push buttom gets a direct 12v from the battery , a ground, and a connection to the starter. Correct me if im wrong but it sounds simple enough.

combatcarl

Don't know about the pushbutton start, never set one up. One more set of wires to get messed up. Just follow the fuel pump wires from tank forward, replace it all if needed, and wrap in some loom cover.

jharriet

Werre exactly do the fuel pump wires go to? I can most likely figure out the pushbutton

jharriet

Isnt it wired into the ignition someweres?

Discombobulated

Before you start hacking things are you sure you don't want to figure your ignition out?? I have seen what a push button start can turn into and it isn't pretty.

jharriet

Well i cant really figure out the ignitiion unless i run new wires to that. And im not even sure were those wires come from. I just want the thing to start i dont care about haveing a key or that crap.

jharriet

Well most people are stareing me away from the pushbutton, so i guess i have to figure out the ignition. The starter gets 12v but the small wire wich i assume is the signal doesnt send any power.

jharriet

well i broke ground lol, the ignition works and i had it idleing with a battery hooked up to the fuel pump. the truck idles at about 3-400 rpms but everytime i touch the gas it will die. any input on what may be causeing this?