Hesitation durring acceleration
09-10-2018, 11:43 AM
#1
Hesitation durring acceleration
Hey, I have an 89 4Runner. SR5, EFI, 4cyl. It runs great except when I drive it for more than half an hour it starts to hesitate when I put on the gas. First it starts just skipping a little, and then it will start boging down for longer and longer amount of time until it just slowly slows way down. When I put the gas on it sounds like I’m going over a washboard-like a gently bumpy road. When I take the gas of it’s smooth. It’s like it ain’t getting the proper fuel/air. But intermittently and only after being in the road for a while. So when I stop and it’s been running like that and I manually rev it it isn’t smooth.
I replaced the fuel pump and filter, I’ve replaced the spark plugs and wires, and the distributor cap and rotor. Maybe it’s one of the sensors?
help?
I replaced the fuel pump and filter, I’ve replaced the spark plugs and wires, and the distributor cap and rotor. Maybe it’s one of the sensors?
help?
Last edited by Jasmyn825; 09-11-2018 at 04:45 PM.
09-10-2018, 07:21 PM
#2
Could be starved of fuel, clogged injectors? That happened to me after Utah trip when I gassed up at unknown stations (could also be the weather conditions that put condensation / rust in gas station reservoir). A few tankfulls of known good gas, with fuel injector cleaner added and problem went away.
?
?
09-10-2018, 08:56 PM
#5
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EGR getting stuck open when it heats up?.
Easy test for this is to pull the vacuum hose from the main diaphragm when cold engine, If the problem continues, Then its not EGR.
Easy test for this is to pull the vacuum hose from the main diaphragm when cold engine, If the problem continues, Then its not EGR.
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09-11-2018, 09:52 AM
#8
Could be starved of fuel, clogged injectors? That happened to me after Utah trip when I gassed up at unknown stations (could also be the weather conditions that put condensation / rust in gas station reservoir). A few tankfulls of known good gas, with fuel injector cleaner added and problem went away.
?
?
running like a dream again, and all the better for all the other work done.
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