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Re: wont pass emissions
Tps is throtle position sensor check inside the throttle body the could be abuild up of gum clean with carby cleaner to improve air flow and has anyone moved the adjusting screw on the throttle these are factory and dont work well when moved reset codes road test and check codes again if the code come back replace tps switch
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Unfortunately it is not a certain amount of time or miles that the car needs to be driven.
There are several 'readiness monitors' that basically cover each emissions related system. For instance there is an EVAP monitor that checks the EVAP system and all of it's components under certain specific conditions (No VSS, TPS, O2 sensor, IAT, MAP, Fuel trim, Injector ciruit, EGR pintle position, ECT, or MAF sensor DTC codes set; Start up engine temp 40F-86F; gas tank between 15% and 85% full, Barometer above 75 kPa, system voltage 8V-16V).
So more information is needed as to what failed you the first time. What DTC code was triggered?
If the problem has been fixed right, the history codes will go away after 40 CONSECUTIVE drive cycles WITHOUT the problem re-occurring.
Strange that it failed the emission test. The codes given relate to the transmission computer not outputting the correct signals to the engine (power) control module ECU. Have you noticed any abrupt gear shifts lately?
I wonder if the emission test failure is related. Sometimes the gear selection failure can be as result of the ECU getting the incorrect information from a faulty throttle position sensor TPS. The ECU relays the information to the transmission controller and this snatches at the gear shift at slightly the wrong time. A faulty TPS might also be responsible for the ECU setting the wrong fuel air mixture and this would result in inappropriate exhaust gas emission.
The TPS is on the throttle plate shaft and is located on the outside of the throttle body. The two outer pins on the TPS plug have 0 volts and 5 volts. The middle pin sends the voltage to the ECU according to the throttle shaft position between 0 to 5 volts.
Check out the TPS thoroughly before looking for something more complicated. Then next I would pull the sockets from the respective control units and make sure all the contact pins are clean and bright to ensure good inter connection
It is an actual warning.The 4wd is not like an emission warning where it has to be checked to make sure it still passes emissions.You need to get the codes checked to see what could be causing the light to come on.Hope this helps.Good luck.
if evap is the only monitor that hasn't set yet, the car should still pass, a car is allowed to have 1 monitor that isn't set and still pass as long as the check engine light isn't on. take it in for the emissions, it should pass.
well if its poping an o2 code try a couple things before you start spending money. when it starts up listen for a rattle from the cattilitic convertor. if you have a bad rattle replace the cat that might solve both codes if no rattle replace the o2 sensor, it might just be that. hope this helps
When you rest your codes there is a series of tests your ECU has to go through before you can pass emissions. this is done some people can reset the code and go before its sets the code again. on the 96 you can have 2 tests not complete for it to pass. basicly you have to drive the car a couple days for the tests to pass.
check the readiness tests wait until only 2 have not passed. then you should be good.so drive and check.