Question about 1995 Volkswagen Jetta
Your problem is not having the correct air:gas ratio of 14.6:1 to begin with. When you accelerated, throttle valve open but gas is not delivered to mix with air in a correct ratio that why you felt underpowered. The main problem is that you don't have correct control of fuel delivered to Fuel Injectors. 1- Your Idle is OK since at this stage it doesn't need O2 sensor to interfere. 2- Above this idle speed, the O2 sensor will give the feed back from the CO exhaust measurement to ECM to control the gas delivered to injectors to mix the right ratio.If it is bad, ECM receives wrong signal, then gives wrong command to deliver gas causing this problem. 3- Since the ECM didn't do its job giving command to inject correct amount of gas as it supposed to be. That is why your gas consumption is getting worst. Have the O2 sensor replace will take care of your problem.
Posted on Sep 08, 2009
Here is whats wrong: your car has EGS(ethanol gas syndrome). This probably is what was wrong all along. First; buy a new fuel filter. And buy a can of SEAFOAM. Change out filter, and add SF to tank of at least 1/2 tank of gas. Then let car idle for at least 5 min(even if you must regulate idle with your foot on pedal).<p>
Then take car out for 5-10 mile hard run.<p>
You may have to change fuel filter one more time. What has happened, your car sat all that time, and the corn(yes the corn) created a by product that turns to a syrupy goop and excessive water. It gets in all fuel lines, emission parts, and your tank was full of this when you started it for the 1st time in 3 months. It just pulled it all through the system.<p> After you do this, be sure to add a can of SF every 5000 miles to prevent this problem again. And if you must leave car un-started for a long period, put Premium gas, and a can of SF in it to prevent this. The Gas companies and the EPA sure screwed up on this one. Good luck. (by the way. the light is probably lean mixture. wouldn't hurt to replace oxy sens. or take it out and have it cleaned)
Posted on Sep 08, 2009
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Posted on Jan 02, 2017
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