myyota

Im almost done with my 86 4Runner, but now it has a new problem that started about two weeks ago, i can only drive it around my cousins property right now because its not registered yet, but it started acting like it was running out of gas and loosing power for a few seconds and then it would be fine for a short time and then do it again, and the throttle response is very gerky when its doing this. About two months ago i replaced the TPS, so i know its good, it also has new plugs, plug wires, cap/rotor, and fuel filter, so im thinking the fuel pump is on the way out, its the original fuel pump with over 200,000 miles on it, so does that sound right or is there something else i should check before i order a new fuel pump ?.

Matt3203

my truck is doin the same exact thing!
i got new plugs, wire, filter, ect and its so annoying!

myyota

^bump^ am i on the right track ?.

myyota

Any ideas ?.

Jay351

Have you checked the fuel filter??

Do you run the tank low often?

yodamudstar

man i had same prob with my 86 22r can you here it turnin on?have you checked your sending unit? hows your eye glass on your carb?does it have =or half of gas in it?
is your fuel filter dirty stoping flow? ive got more ideas if none of those work

4Crawler

iTrader: (3)

Try the fuel pump test jumper (22RE engine assumed):
- http://www.4crawler.com/4x4/CheapTri...shtml#FuelPump

yodamudstar

hesitation or stumble during acceleration.
1 ignition timing incorrect
ignition system not operating properly
2dirty or clogged injectors or carb
3 low pressure check for proper operation of the fuel pump and for restricions in the fuel filter and lines
4caburetor out of adjustment

myyota

The fuel filter is only about 3 months old and has less than 5 miles on it, and no i don`t run the tank low, but considering the fuel pump is 23 yrs old with over 200,000 miles on it, thats why i was thinking its going bad.

yodamudstar

mines same age try your sending unit in the tank i took mine out cleaned it all.theres gonna be this filter on it i call it the sock once its so dirty it just stops

myyota

4Crawler, i did your jumper mod a several months ago, and i can hear the fuel pump running when i turn the key on. My 4Runner will run normally for the first five minutes or so, then then it will act like its running out of gas just for a second or two and the throttle response feels real jerky, then it will clear up and be fine for a few minutes and then do it all over again. It just started doing this two weeks ago and before that everything was fine. Is there a way to test the ignitor ?.

myyota

I had to replace the fuel tank a few months ago, and the inside of the new tank was/is spotless, so i know its not that.

yodamudstar

the only other thing i could think is maybe a bad intake leak like an engine surgewhile holding down the accelerator steady and it takes a big gulp of air

yodamudstar

is there any water in ur distributer cap,you said that ur spark plugs are new did you gap them right to your truck?hows your vacuum hoses coming of the carb

4Crawler

iTrader: (3)

Any trouble codes stored in the ECU?
- http://www.4crawler.com/4x4/CheapTri...CheckConnector

myyota

No codes and no check engine light.

myyota

Plugs are gapped corectly, and my engine is a 22RE, no carb.

yodamudstar

hmmm im trying to give you exact result ive got the book infront of me lol um not vacuum .umm here pick one of these then ill give you more results lol.
1engine lacks power
2hesitation or stumble during acceleration
3engine surges
4engine misses during driving speed
these are just dif trouble shooting spots in book whcich one sounds like ur prob

myyota

#2 would be very close to whats going on, but its not constant.

yodamudstar

1 ignition timing incorrect
ignition system not operating properly
2dirty or clogged injectors or carb
3 low pressure check for proper operation of the fuel pump and for restricions in the fuel filter and lines
4caburetor/injectors out of adjustment
5intake leak on breather or intake manifold
6egr
7mass air flow sensor
8fuel pump faulty or impuritys in fuel system
this is what it says for number 2 let me know out of these then ill check chapters for you sry for process of elimination