Question about deceleration system on our cars
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Question about deceleration system on our cars
I was reading about the deceleration system which is PART of the ACV. Now the job of deceleration system is to prevent bucking/fuel cut when you let off the gas at higher rpms...now my CAR does exactly that, bucks, fuel cuts at high rpms when I LET off the gas! Now I got my AIRPUMP out right now and was wondering I put it back and got the ACV running back to normal again, whether this might SOLVE my problem?
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There are a number of pieces to the deceleration system.The piece described in the manual is basically the anti afterburn valve in the ACV which lets air in to stop popping and banging in the exhaust.
In addition the ecu reduces the amount of fuel injected on deceleration--depending on engine speed(rpm) and throttle valve opening(TPS signal)there is fuel cut to the front rotor only or fuel cut to both rotors.The bucking you refer to is usual the result of TPS performance-poor adjustment or a malfuntion.
Replacing the air pump and ACV will not help you.
In addition the ecu reduces the amount of fuel injected on deceleration--depending on engine speed(rpm) and throttle valve opening(TPS signal)there is fuel cut to the front rotor only or fuel cut to both rotors.The bucking you refer to is usual the result of TPS performance-poor adjustment or a malfuntion.
Replacing the air pump and ACV will not help you.
#3
knowledge junkie
OOOOHHHHHHH!!!!
I'm VERY INTERESTED in this. I've gotten use to slowly letting off the gas @ 4500rpms - full boost - 4th gear. Otherwise the engine seriously jerks.
The worst is coasting in traffic in 1st or 2nd. I hate how the car bucks a bit when letting off or slighly acceleration.
Any LINKS or URLs??
I'm VERY INTERESTED in this. I've gotten use to slowly letting off the gas @ 4500rpms - full boost - 4th gear. Otherwise the engine seriously jerks.
The worst is coasting in traffic in 1st or 2nd. I hate how the car bucks a bit when letting off or slighly acceleration.
Any LINKS or URLs??
Last edited by vaughnc; 10-17-01 at 05:20 PM.
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Originally posted by Six Rotors
There are a number of pieces to the deceleration system.The piece described in the manual is basically the anti afterburn valve in the ACV which lets air in to stop popping and banging in the exhaust.
In addition the ecu reduces the amount of fuel injected on deceleration--depending on engine speed(rpm) and throttle valve opening(TPS signal)there is fuel cut to the front rotor only or fuel cut to both rotors.The bucking you refer to is usual the result of TPS performance-poor adjustment or a malfuntion.
Replacing the air pump and ACV will not help you.
There are a number of pieces to the deceleration system.The piece described in the manual is basically the anti afterburn valve in the ACV which lets air in to stop popping and banging in the exhaust.
In addition the ecu reduces the amount of fuel injected on deceleration--depending on engine speed(rpm) and throttle valve opening(TPS signal)there is fuel cut to the front rotor only or fuel cut to both rotors.The bucking you refer to is usual the result of TPS performance-poor adjustment or a malfuntion.
Replacing the air pump and ACV will not help you.
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I am confused about which problem you are trying to solve.In your first post it was "bucking/fuel
cut".I tried to answer that.
Now you want to solve that--easy: reinstall your air pump and ACV,adjust the dashpot to the spec described in the manual were reading and make sure you have no leaks in your exhaust system.If you have a really open exhaust you may have to "over" adjust the dashpot,ie 4.0 kohms.
cut".I tried to answer that.
Now you want to solve that--easy: reinstall your air pump and ACV,adjust the dashpot to the spec described in the manual were reading and make sure you have no leaks in your exhaust system.If you have a really open exhaust you may have to "over" adjust the dashpot,ie 4.0 kohms.
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Originally posted by Six Rotors
Sorry I don't have any.I have a Mazda technician trainng manual which describes how the ecu controls fuel injection amounts.Unfortunately it does not have a whole lot of detail.
Sorry I don't have any.I have a Mazda technician trainng manual which describes how the ecu controls fuel injection amounts.Unfortunately it does not have a whole lot of detail.
Henrik
87TII
#9
Originally posted by vaughnc
OOOOHHHHHHH!!!!
I'm VERY INTERESTED in this. I've gotten use to slowly letting off the gas @ 4500rpms - full boost - 4th gear. Otherwise the engine seriously jerks.
The worst is coasting in traffic in 1st or 2nd. I hate how the car bucks a bit when letting off or slighly acceleration.
Any LINKS or URLs??
OOOOHHHHHHH!!!!
I'm VERY INTERESTED in this. I've gotten use to slowly letting off the gas @ 4500rpms - full boost - 4th gear. Otherwise the engine seriously jerks.
The worst is coasting in traffic in 1st or 2nd. I hate how the car bucks a bit when letting off or slighly acceleration.
Any LINKS or URLs??
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Originally posted by Six Rotors
I am confused about which problem you are trying to solve.In your first post it was "bucking/fuel
cut".I tried to answer that.
Now you want to solve that--easy: reinstall your air pump and ACV,adjust the dashpot to the spec described in the manual were reading and make sure you have no leaks in your exhaust system.If you have a really open exhaust you may have to "over" adjust the dashpot,ie 4.0 kohms.
I am confused about which problem you are trying to solve.In your first post it was "bucking/fuel
cut".I tried to answer that.
Now you want to solve that--easy: reinstall your air pump and ACV,adjust the dashpot to the spec described in the manual were reading and make sure you have no leaks in your exhaust system.If you have a really open exhaust you may have to "over" adjust the dashpot,ie 4.0 kohms.
Last edited by ROSHX7; 10-18-01 at 11:01 PM.
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