Weird hesitation on 92 civic
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Joined: Nov 2007
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From: Rochester, NY, US
Weird hesitation on 92 civic
My car has weird hesitation i cant figure out for the life of me, and it also gets bad MPG
New: Plugs,cap,rotor,ignition coil
Replaced the coolant sensor, FPR seams fine, Ignition timing is mint as with the belt timing...
Some time while tryin the accelerate the car bogs down like it has almost no horsepower , so i tip into the throttle and when it comes alive it'll spin the tires in first gear. Traveling down the expressway it'll have a very slight hesitation, or when accelerating it sometimes does it...now the problem is only on partial throttle not WOT.
Car is bone stock with a D15B7
Car also gets approx 26mpg highway
Possible o2 or fuel pump??
New: Plugs,cap,rotor,ignition coil
Replaced the coolant sensor, FPR seams fine, Ignition timing is mint as with the belt timing...
Some time while tryin the accelerate the car bogs down like it has almost no horsepower , so i tip into the throttle and when it comes alive it'll spin the tires in first gear. Traveling down the expressway it'll have a very slight hesitation, or when accelerating it sometimes does it...now the problem is only on partial throttle not WOT.
Car is bone stock with a D15B7
Car also gets approx 26mpg highway
Possible o2 or fuel pump??
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Joined: Sep 2004
Posts: 1,232
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From: Somewhere Dark and Scary
i've had the same problem for a while without a cel until it did get a lot worse and now i get a CEL for the o2 sensor / heater. CEL also comes on after 15-20mins of driving, starts to bog and hesistate until CEL comes on and runs into limp mode.
99% its the o2 sensor.
99% its the o2 sensor.
Cool Cool Island Breezes. BOY-EE
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From: TRILLINOIS....WAY downtown, jerky.
Re: Weird hesitation on 92 civic (boostedEBP)
The primary O2 sensor is inactive under moderate to heavy acceleration. It is only "heard from" by the ECU for cruise and very light throttle, or idle when the car is at operating temp.
If you accelerate moderately or WOT, the car goes into open loop anyway. Accelerating normally in traffic, you will most likely reach the "moderate" point.
Is your TPS and MAP in good condition? Check them with a volt meter.
TPS should read close to 1V with the throttle closed...and around 4.5V with the throttle at WOT. Obviously, do this in the key "on" engine "off" position.
I forgot what the MAP voltages were exactly. But they should be around 1V at full vacuum, and 4.5V at no vacuum. Again, with the key in the ON postion but the engine OFF, the map should read high voltage. Since the car is off, there is no vacuum, so the MAP thinks you're flooring it.
You can put a vacuum pump up to a manifold line to get the MAP reading at high vacuum (idle or decel).
Good luck.
If you accelerate moderately or WOT, the car goes into open loop anyway. Accelerating normally in traffic, you will most likely reach the "moderate" point.
Is your TPS and MAP in good condition? Check them with a volt meter.
TPS should read close to 1V with the throttle closed...and around 4.5V with the throttle at WOT. Obviously, do this in the key "on" engine "off" position.
I forgot what the MAP voltages were exactly. But they should be around 1V at full vacuum, and 4.5V at no vacuum. Again, with the key in the ON postion but the engine OFF, the map should read high voltage. Since the car is off, there is no vacuum, so the MAP thinks you're flooring it.
You can put a vacuum pump up to a manifold line to get the MAP reading at high vacuum (idle or decel).
Good luck.
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5 Skware
Honda Civic / Del Sol (1992 - 2000)
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Sep 12, 2003 07:05 PM
1992, 92, acceleration, civic, d15b7, gear, hesitates, hesitation, hesitations, honda, o2, problem, sensor, throttle, wot
