Question about 1991 Toyota Camry

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Surges while driving

Starts good pulls out good but when gaining speed power comes and goes "surges" changed -plugs, wire cap assy., rotor button, fuel additive, not a change.
odd thing is if you let out it of it give it less gas or feather the peddle it'll pick up, I also noticed with a full tank of gas it ran better. all of this came about after the car sett a couple of months before i could had the time to change the water pump.. before if i let it set a few weeks it would do the same thing but only last 2-3 days then run fine "before water pump leak" 91 camry .... i'll check the fuel lines for a pin hole and pickup tube in tank /fuel pump

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  • tractorman54 Jan 17, 2009

    replaced the tube no change?

  • tractorman54 Jan 17, 2009

    changed out the air box,coolant sensor, i did notice when it was 6-18 degrees the other day it ran good with very little hesatation?

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Hi there!
  Check the large rubber tube going from the air filter to the throttle body. I had one of these that would do the same thing, and this was the problem. The "Air horn" (dealer calls it this..) has a section on it that will crack and the crack will only open when the engine moves a bit (like under acceleration for example) when the crack opens up , it lets more air in than the Mass air flow sensor knows about, causing the engine to bog down..this is why when you "feather" the gas, it wont do it, because the engine isnt jerking and opening the crack...Remove the big rubber tube and flex it back and forth while looking for cracks. You can repair them with gasket maker,and some electrical tape -- but the best bet is to just replace the tube.

Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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