Question about 1988 Honda Accord 4 Door

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Honda Accord LX 1988

Vacumn leak or intake valve leak, not sure. One mechanic says vacumn leak, and another says intake valve leak. Also, I need to know about changing out the valve cover gasket, if it needs grommetts.

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  • Anonymous Jul 30, 2008

    When I come to a stop at red light or stop sign or whatever, I have to keep one foot on accelerator and one foot on the brake or it will go dead.

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Hello if this is carburated look inside the carburator front inside at the wall look for crack or cracks on the inner walls check all hoses for cracks dried rubber you can usually find exterior vacuum leaks with a can of carb cleaner lightly spraying around base of carb but extreme caution has to be taken when doing if your not that experienced i wouldnt advise this if your car is equiped with tps sensor check for possible out of range sensor goodluck

Posted on Sep 18, 2008

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That sounds like a possible vacumn leak

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There may be a couple of items to look at here.... but the most common problem is a source of vacumn to the pneumatic operation of the heat/a/c vent doors....if vacumn is not distributed properly to the vents you command it is assumed that there is either no vacumn to the selector swith panel(broken vac. line,kinked vac. line, defective in dash a/c control panel) or under the hood a defective vac./heater control valve that is stuck,frozen, not allowing the vacumn to pass through it to supply the indash pneumatic controls and/or panel.
Most vacumn systems that i have ever came in contact with incorporate a vacumn supply tank(nothing more then a round plastic vac. resevoir) which is used in sequence with the a/c heater controls, its purpose is to keep an even vacumn supply to all command points continously while the vehicle is being driven, without this supply one will experience the a/c coming from various different non selected dash vents upon acceleration, this is a direct relation to the tank either being defective(leaking vacumn) or its supply hose(usually vey tiny rubber/plastic tubes) being pinched or broken not allowing the vacumn to the supply tank.
listen for vacumn leaks(hissing sound), look for the obvious...broken vacumn lines or hoses, also check for a defective one way vacumn valve on some pneumatic controlled door vent systems(these valves are inserted in a vacumn line one side being the ""in" port and the other side of it being the "out" flow port,typically if these dont work the vents will also devert your a/c or heat all different ways through your dash.
to check these valves, simply remove from the vacumn hose, and apply vacumn to one side,if vacumn flows through the valve, apply the same vacumn to the opposite side of the plastic valve, if vacumn flows through on the opposite side the valve is bad, it should only allow flow from one side not the other. These valves are small and are usually white or black plastic and look like the old vacumn dash pots used on the old carbureated engines only smaller with one small hose in and one small hose out.

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mcdevito75 here, Could be a dirty fuel fliter, remove fuel inlet toarb, crank engine but don"t start, container of 1 pint of gas should pump out from detached carb. fuel inlet, if not replace fuel pump. Very high idle and very low idle could also be a major vacumn leak, check all vacumn hoses, also check intake manifold, spray soapy water around intake manifold try to start, if you see water sucked in or engine now starts, there"s your problem, a vacumn leak.

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One will control the heater core valve, one will control the deflector door and one is problem vacumn in from intake manifold. If the vacumn motor that controls the valve or the door is leaking you would have this problem. Also if vehicle is low on anti-freeze you could have this problem, Hope this helps! The vacumn motors are easily checked by take a small piece of vacumn hose and intstall it on each one and applying suction by mouth, if they leak you will not be able to make them retract or they will leak down after you pull them in.

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