I have a '99 CR-V EX w/ real time 4WD that has - beginning a little over
a year ago - begin getting fairly poor mileage compared to where the
care was newer. I change the oil and filter regularly, have recently
replaced the air filter, have installed (and properly gapped) new spark
plugs, and recently had the wheels aligned. Still, I'm only getting
about 19 - 20 MPG. Never mind that I drive on the freeway 90% of the
time. I used to get about 23 - 25 MPG and for some reason, my mileage
sucks now. :(
Can anyone suggest what might be causing me to get such poor mileage?
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Stop and go driving obviously uses more gas. The best thing to do is to make sure you do not have a leak. Then the next time you fill up, record the gallons and current mileage on the car. Then compare the next time you fill up by the total mileage on the car divided by the gallons just inputted. That will determine if your gas mileage is high or average.
no not normal. check center of firewall the is a switch with 3 vacuum line CHECK THEM ALL this is your 4wd selector. if thats okay you might need the switch on the front trasfer case about $20 just unscrews easy fix.
It is possible that the transfer case encoder motor is going bad. The encoder motor is what is used to shift the transfer case. his part is prone to be bad , especially if the vehicle is high mileage. I would recommend to take it to a reputable repair facility and have it diagnosed before just replacing it based on what you have told me and the fact that I have not actually diagnosed it.
Don't think I've ever seen "too much" battery....The higher the cold crank amp rating (cca) the better off you are. The important thing is to use a battery that will not interfere with anything near it and will not touch the hood when it's closed. Also important is to begin with a fully charged battery. It takes very little work for an alternator to keep a good battery charged, regardless of size... A discharged battery will continually overwork the alternator, robbing horsepower from the engine and quickly burning the alternator out. Another battery tip is to keep it clean and put it on a two amp external charger every month or so. That prevents bleed off of voltage from conductive dirt and compensates for the time spent listening to the radio and keeping the "sleep mode"(from clock, and computer memory) losses to a minimum. One item most people don't know is that an alternator (unlike early cars with generators) are designed to maintain the state of charge in the battery. Begin with a half charge and it will never get much better than that. If you do this, you can get up to two extra years of service from all but the most poorly constructed batteries.
It could be water has gotten to something it shouldn't have, I would check the front u-joints to your front axles. There may be grease fittings on them but most of the time they are sealed or should be at least, u-joints can make a squeaky sound if there is no grease.
After market spark plugs could be the problem.
Reinstall the old plugs and see if that fixes it.
This vehicle has an ion sensing ignition system and is real sensitive to the proper spark plugs. I would get the proper plugs from the dealer if the old ones work.
The codes P1311 and P1312 are ion sensing codes.