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Old 04 Dec 2011, 10:02 pm
Join Date: Oct 2007
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Default When I put my 1993 honda accord in park, the engine begins to rev as if I'm stepping on the gas....

...Help? I've encountered a problem with my 1993 honda accord as of late. Whenever I put the vehicle in PARK, it begins to rev up slowly but continuously. This is without me stepping on the gas at all. It begins to rev up as if I were stepping on it, trying to rev up the engine. (i.e. vrooom, vroooom, vrooom). That's the best way I can describe it. A buddy told me he thinks it's the idol stabilizer? Not sure though.
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Old 04 Dec 2011, 10:46 pm
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We had a similar situation with our 2002 Dodge Durango. After several mechanics checked it (sometimes the revving wouldn't happen while they were there and I'm sure some thought we were hearing things) someone finally figured out that it was the computer. Someone before that did say it was the timing/timing belt but after changing it/fixing it the same thing kept happening and even after taking it back they still couldn't figure it out. But ultimately it was when someone much later checked the computer thoroughly that they found the problem and could fix it properly. I think we had this problem for about 5 years. We didn't even take it in for that specific problem when the mechanic found out the solution. He didn't charge us for it either.
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Old 04 Dec 2011, 11:01 pm
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Idle hunting is a favorite Honda hobby. The most common cause is a bubble in the coolant driving the Fast Idle Thermo Valve crazy. The coolant has to be bled every time it is filled - there is a nipple, like a brake bleed nipple, on the upper radiator hose housing (if I remember right) where it connects to the engine. With the engine cold, use a 12 mm socket to open that nipple half a turn and close it when a steady stream of coolant comes out. Be sure to top up the coolant in the radiator if it is low.

If that doesn't take care of it there are a lot of suspects. A bad O2 sensor can trigger idle hunting and if your O2 sensor (it only has the one behind the radiator) is original it is way past due for replacement. A bad intake manifold gasket can do it, too, but replacing the gasket is a pretty big job. You can also try cleaning the throttle body (I recommend regular carburetor cleaner rather than Seafoam, which leaves an oily film that attracts dirt). Cleaning the Idle Air Control valve (the device with two wires rather than two hoses on the front side of the throttle body) can't hurt but it is blamed a lot more often than it is at fault. In the Honda system every bit helps.
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