Js'00imited4runner
Member
Hey everybody looking for some input on what my issue might be since I am completely stumped on this one.
Alright so a few weeks ago I was driving home from work and I had a 1/4 tank of fuel. I came to a stop and made a right hand turn and it sputtered out and died. Pull off the side of the road and I got it going again. Drive a couple miles to slow down and make a left turn slowly it didn't die. But after I made the turn I would get on the throttle and it would hesitate/stall/stumble like it wasn't getting enough fuel. So I get to another stop sign to make a left hand turn and I make the turn and it dies in the intersection! Bad situation to be in. So I get it off the road and get it running again barely. So I go on my way and I could barely get it up to 55mph and I had to very gently ease on the throttle to keep it moving. So I get to another stop sign in town and make a left hand turn, dies on me again! So now i'm just getting worried with whats going on mechanically. I end up limping it along to the gas station and fill it up. After I filled it up I took it around the block and MASHED on the pedal and the problem was gone (Or so I thought). I get it home and take it to work the next morning and now the throttle won't even rev past 2500 rpm's without hesitating/cutting power to the engine but I never lose ignition power. So I get it home and tear into the MAF sensor, clean that up check the vacuum lines, and all the way up to the throttle body clean it with throttle body cleaner. Then disconnect the battery incase their are any codes stored. Take it for a 10 minute drive a few hours later and its doing the same thing. So the next day I buy a new fuel filter and that friday night I took the old one out and blasted a good amount of sediment/rust/gunk out of it. Put the new one in and for about 5 minutes it was fine but I could feel it was losing power right around 4K rpm as I gave it the beans. Then that was short lived and it was back to its old limp self. A few days goes by and I removed the new fuel filter and blew back through it and reinstalled it yet again only a temperorary fix. So I recently discovered how to hook up to the fuel system a simpler way through the fuel line before the injectors (posted thread). So now at idle it has 42-44lbs of pressure which is good? So I take it for a test drive with the pressure gauge hooked up and It holds 44lbs steady up until about 3500-4Krpms and the pressure drops to 18lbs but only this time for some strange reason I was able to get the revs up but was still hesitating at wide open throttle just not completely cutting out like before. Sorry I know this is a long post but I would think if it was injectors it would be throwing a code, also if it was spark plugs same thing. I'm thinking its gonna be between the fuel filter and the fuel pump? If it was the fuel pressure regulator the pressure would be going bonkers the whole time and not hold steady..I'm at a loss because I maintain this thing like no other.
My other guess is maybe the throttle position sensor? Just odd it was running fine up until that one day and all of a sudden it takes a turn for the worst. Odd thing is it hasn't thrown a check engine code and I've gone through about a half a tank of fuel to try and diagnose what is going on. I've pretty much covered the intake/vacuum line side of things.
Anyway any input is appreciated. If I end up resolving it I will let everyone know.
Cheers and have a good weekend!
Alright so a few weeks ago I was driving home from work and I had a 1/4 tank of fuel. I came to a stop and made a right hand turn and it sputtered out and died. Pull off the side of the road and I got it going again. Drive a couple miles to slow down and make a left turn slowly it didn't die. But after I made the turn I would get on the throttle and it would hesitate/stall/stumble like it wasn't getting enough fuel. So I get to another stop sign to make a left hand turn and I make the turn and it dies in the intersection! Bad situation to be in. So I get it off the road and get it running again barely. So I go on my way and I could barely get it up to 55mph and I had to very gently ease on the throttle to keep it moving. So I get to another stop sign in town and make a left hand turn, dies on me again! So now i'm just getting worried with whats going on mechanically. I end up limping it along to the gas station and fill it up. After I filled it up I took it around the block and MASHED on the pedal and the problem was gone (Or so I thought). I get it home and take it to work the next morning and now the throttle won't even rev past 2500 rpm's without hesitating/cutting power to the engine but I never lose ignition power. So I get it home and tear into the MAF sensor, clean that up check the vacuum lines, and all the way up to the throttle body clean it with throttle body cleaner. Then disconnect the battery incase their are any codes stored. Take it for a 10 minute drive a few hours later and its doing the same thing. So the next day I buy a new fuel filter and that friday night I took the old one out and blasted a good amount of sediment/rust/gunk out of it. Put the new one in and for about 5 minutes it was fine but I could feel it was losing power right around 4K rpm as I gave it the beans. Then that was short lived and it was back to its old limp self. A few days goes by and I removed the new fuel filter and blew back through it and reinstalled it yet again only a temperorary fix. So I recently discovered how to hook up to the fuel system a simpler way through the fuel line before the injectors (posted thread). So now at idle it has 42-44lbs of pressure which is good? So I take it for a test drive with the pressure gauge hooked up and It holds 44lbs steady up until about 3500-4Krpms and the pressure drops to 18lbs but only this time for some strange reason I was able to get the revs up but was still hesitating at wide open throttle just not completely cutting out like before. Sorry I know this is a long post but I would think if it was injectors it would be throwing a code, also if it was spark plugs same thing. I'm thinking its gonna be between the fuel filter and the fuel pump? If it was the fuel pressure regulator the pressure would be going bonkers the whole time and not hold steady..I'm at a loss because I maintain this thing like no other.
My other guess is maybe the throttle position sensor? Just odd it was running fine up until that one day and all of a sudden it takes a turn for the worst. Odd thing is it hasn't thrown a check engine code and I've gone through about a half a tank of fuel to try and diagnose what is going on. I've pretty much covered the intake/vacuum line side of things.
Anyway any input is appreciated. If I end up resolving it I will let everyone know.
Cheers and have a good weekend!
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