Question on the air flow measuring unit on my Elantra..
It is a 1992 Elantra, early production. I have been fighting low
power at low RPMs and a pulsing/bouncing idle, also, the idle speed seems to vary alot after it has been driven awhile. I checked the output from the air-flow sensor, and found it REALLY jumpy at idle, how smooth is it supposed to be? The computer was replaced (the old MITS one crapped out) The car just drives weird with low power... Are there any mods to make on this car to improve it to the later 1992 ones? Thanks for any info as always, AJH |
Re: Question on the air flow measuring unit on my Elantra..
There are no siginificant differences between the early 92 and later 92
vehicles. In fact, I don't recall any, but I'm sure there are probably a couple. The bouncing idle is caused by too much air entering the engine. The computer begins shutting off the injectors in an effort to slow the engine down. As the injector pulse starts/stops, the engine revs up and down, causing the bouncing. I've seen improper repairs where the throttle was pulled open by adjusting the throttle cable on cars which were stalling. This will cause the bouncing condition you describe. Check your throttle cable to be sure it isn't holding the throttle plate open. Check the air bypass screw to be sure it isn't allowing too much air into the engine. Check your idle actuator. It screws into the bottom of the throttle body and has a six pin connector with two rows of three pins. If I recall correctly, the resistance in each row between the center pin and each of the outer pins should be about 30-35 Ohms. If the actuator doesn't work properly, it could cause the bouncing idle. If it's shorted, it WILL blow up the computer. An open circuit just won't work, but won't kill the computer. The air flow readings are jumpy at idle because your car isn't idling steady. The air flow readings should be steady, but so should your rpm's. Address the rpm's first and the air flow readings should follow. Low power typically has nothing to do with idle settings. Can you tell if the car's misfiring? Low rpm lack of power issues tend to be caused by ignition misfires. If you're misfiring, I'd check the plugs, wires, and coil. Does it matter whether the car is cold or hot in terms of the lack of power? Does it matter how fast you're going? |
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