Variable Resisitor Useless
09-14-05, 08:32 AM
#1
King of the Loop
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Variable Resisitor Useless
Hey guys last week i was adjusting my timign idle ect and decided it try to lean out my idle to save some gas. However upon turning the variable resistor iv come to see it doesnt do a god damn thing. ive turned it to its extreme in each direction without a change in engine sound or behavior. Is it possible its broke? From what i read the car should almost shut off when turned too lean.
09-14-05, 08:49 AM
#3
Locust of the apocalypse
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Its easy to tell if its functioning.. pull the harness plug... Set a digital milti-meter to Ohms and plug it into the VR's plug.. the resistance should change as you move the pot from one extreme to the other...
As to WHAT the resistance spec IS.... I dunno..
the OTHER way is to set the multimeter to VOLTAGE, and back probe the connection while the ignition is on and turn the pot an see if the voltage changes.. again.. i dunno the spec.. BUT, most sensor circuit voltages run fro 0-5 volts or 0-1volt... (the variable resister set the reference voltage for the computer... the computer uses this reference voltage for everything.. thats why they say not to mess with it.
As to WHAT the resistance spec IS.... I dunno..
the OTHER way is to set the multimeter to VOLTAGE, and back probe the connection while the ignition is on and turn the pot an see if the voltage changes.. again.. i dunno the spec.. BUT, most sensor circuit voltages run fro 0-5 volts or 0-1volt... (the variable resister set the reference voltage for the computer... the computer uses this reference voltage for everything.. thats why they say not to mess with it.
09-14-05, 08:54 AM
#4
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Originally Posted by Alex6969
were is the variable resistor located?
is over on the passenger side strut tower by the pressure sensor.. that little black cylinder that eveybody wonders what the hell it is..
Last edited by YearsOfDecay; 09-14-05 at 08:58 AM.
09-14-05, 09:28 AM
#6
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Originally Posted by Low Impedance
lol...i always wonder what the hell that thing did!!!! do i really need that thing anyhow seeing my idle is controlled by my idle stopper screw?
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09-14-05, 12:31 PM
#8
Originally Posted by BklynRX7
Hey guys last week i was adjusting my timign idle ect and decided it try to lean out my idle to save some gas. However upon turning the variable resistor iv come to see it doesnt do a god damn thing. ive turned it to its extreme in each direction without a change in engine sound or behavior. Is it possible its broke? From what i read the car should almost shut off when turned too lean.
09-15-05, 06:55 AM
#10
Lives on the Forum
Is your idle speed in spec?
If it's too high, the stock ECU ignores that idle mixture screw.
BTW, adjusting that screw lean will do almost nothing for your gas mileage...unless you like to idle your car for 30 minutes in the garage for some odd reason.
-Ted
If it's too high, the stock ECU ignores that idle mixture screw.
BTW, adjusting that screw lean will do almost nothing for your gas mileage...unless you like to idle your car for 30 minutes in the garage for some odd reason.
-Ted
09-15-05, 07:05 AM
#12
King of the Loop
Thread Starter
Originally Posted by RETed
Is your idle speed in spec?
If it's too high, the stock ECU ignores that idle mixture screw.
BTW, adjusting that screw lean will do almost nothing for your gas mileage...unless you like to idle your car for 30 minutes in the garage for some odd reason.
-Ted
If it's too high, the stock ECU ignores that idle mixture screw.
BTW, adjusting that screw lean will do almost nothing for your gas mileage...unless you like to idle your car for 30 minutes in the garage for some odd reason.
-Ted
09-22-05, 02:12 AM
#14
sounds more like your TPS is out of whack not the mixture.
the variable resistor when extremely rich or lean will cause a sort of misfire running condition at idle, the TPS and idle screw can cause the idle to fluctuate hundreds of RPMs.
also be sure you do not have any leaks in the intake system, ie. a ripped or torn intake hose, missing vacuum caps or lines disconnected.
the variable resistor when extremely rich or lean will cause a sort of misfire running condition at idle, the TPS and idle screw can cause the idle to fluctuate hundreds of RPMs.
also be sure you do not have any leaks in the intake system, ie. a ripped or torn intake hose, missing vacuum caps or lines disconnected.
09-22-05, 08:52 AM
#15
King of the Loop
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Originally Posted by Karack
sounds more like your TPS is out of whack not the mixture.
the variable resistor when extremely rich or lean will cause a sort of misfire running condition at idle, the TPS and idle screw can cause the idle to fluctuate hundreds of RPMs.
also be sure you do not have any leaks in the intake system, ie. a ripped or torn intake hose, missing vacuum caps or lines disconnected.
the variable resistor when extremely rich or lean will cause a sort of misfire running condition at idle, the TPS and idle screw can cause the idle to fluctuate hundreds of RPMs.
also be sure you do not have any leaks in the intake system, ie. a ripped or torn intake hose, missing vacuum caps or lines disconnected.
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