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Re: 1998 Toyota Corolla poor gas milage
First i would change the fuel filter. this is the number one reason for poor gas milage. the engine tries to compansate for the lack of fuel and in the long run this weakens your fuel pump and it will fail sooner rather than later. i als would check the air filter. if the engine can't breath properly it will lose power. if you have not had a tune up I would suggest getting one. this most certainly help boost the performance of your vehicle. i would try and use an additive in your fuel to clean the injectors clogged injectors will make the engine run rough and cause hard starting and rough idle.. the last thing i would have you check is the throttle positon sensor and the O2 sensor. take it to a shop and have them hook a diagnostic scan tool to it this will show if either of these sensors are bad or if they threw a code and the computer is trying to overcompensate for the lack of fuel. hope these options help you. please rate this solution thanks
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i crank car.
it starts, engine idles at 1000 to 1500 rpm cold. good
it don't misfire or shake (tuneups work)
i shift in to gear. Drive. or reverse.. car dont move
i step on gas, and RPM goes way high and car will not move.
there is my guess. correct my errors.
or post yours.
The "check engine light" or MIL (malfunction indicator lamp) is telling you that the power train computer is holding a diagnostic trouble code (DTC) in memory. These codes set when a problem with one of the many engine sensors is detected or engine parameters exceed expected programmed limits. A code reader tool is needed to read out these codes and explain the definitions. Most major auto parts stores will read out your codes for free.
Even if your car is running fine, do not ignore this light. In many states, your car will not pass an emissions test with the light on. Many faults that will set codes are related to proper emissions control. But many faults that cause emissions problems also cause poor gas mileage. So if you ignore the light you may very well be wasting precious gas dollars.
One way to check is when you are in neutral or in park, see if the tach is responsive when pressing the accelerator pedal or if the engine reacts immediately. If the engine is not as responsive, then you may have to check for loose vacuum hoses or loose wires or bad fuel filter. It may also be sensors such as the MAF that may have gone bad. Otherwise you may have issues with your transmission. The valves inside the transmission may be clogged with debris or you may have a bad velocity sensor or a bad solenoid which causes you to run sluggish or prevents you from changing gears. Check the condition of your transmission fluid. It may need replacing.
take it to another dealer, in most cases its just a poor connection, poor contact in one of the pin connectors, air bag wiring is very sensative,one poor pin connection does not allways mean that the harness needs to be replaced, it sounds like they dont want to take the time to pinpoint the problem.
Gas milage will vary, depending on the manner in which you drive, also poor gas milage could be due to poor maintenance. Replace the PCV valve, the oxygen sensors, the fuel filter, plugs and wires, and have the injectors cleaned, switch to synthetic oil should improve the milage. .
You are correct. One fan comes on with engine temperature, and both come on (or are supposed to) with A/C operation. Not enough airflow through the condensor at low vehicle speeds will result in poor A/C performance. Check for voltage at the fan with the A/C operating (warning: the fans can cut your fingers severly if they start up, so keep your fingers clear!). If there is voltage, the fan motor is probably bad.