My engine light gauge does not turn on when I start the truck.
I took my 1997 ford ranger to be smog tested. It did not pass because the engine light gauge did not come on. I am wondering if it needs a fuse and I am not sure which number on the fuse panel is to be used for the Gauge light.
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No any codes will let you fail..Rangers are bad about the valve sticking..But first look on th driverside very back on the intake..Youll see a valve with two vacuum lines The one that goes on the bottom of the valve makes a 90 bend and is bad about breaking..If the lines are good then work the valve by hand and see if it will move
I had the same issue with mine. Unscrew your instrument panel and pull it out as far as it will go. The lights are held in place from behind so you will need to slip your hand in and rotate the pastic clip that is fixed to the light to take it off. I never saw behind the panel but I heard it's fragile so be carefull. I replaced it with the ABS light (I already know my ABS doesn't work :P).
No the water pump will not affect the smog test. You probably failed the idle? Usually with this age of vehicle you can replace the o2 (oxygen) sensor and it will pass. Cleaning the MAF if it has one cant hurt either if you do it right.
YOU CANT TURN OFF PCM WHEN IT SPOT A PROBLEM.YOU HAVE TO FIX PROBLEM.BECAUSE THE CHECK ENGINE WILL STAY ON UNTIL PROBLEM FIX. ITS AGAINST THE LAW TO TAMPER WITH EMISSIONS SYSTEM.BECAUSE OF SMOG AND POLLUTION LAWS..HAVE TRUCK SCAN TO SEE WHAT YOUR PCM CODE IS.COULD BE SOMETHING MINOR.
You can check the hoses and look for an obvious leak but you'll likely need to have a shop do a smoke test to find the leak. In most cases you can reset the computer, drive about 50 miles, and pass the test. The check engine light will come back on at some point after that.