Average..........MPG

[ZEUS]

Is it maybe a leak somewhere? The fuel lines are under a lot of pressure being fuel injected so things might not leak unless it's running. ????? ????? Your tires also alter your speedo and odometer so you might be getting worse than 9 mph in actuality... not that you wanted to hear that... sorry! I hope you get it figured out soon.

[Y33TREKker]

Do you have any kind of aftermarket air-filter/intake setup? Maybe the power washing got the element wet and it's creating too much restriction?

Or maybe the power washing made an O2 sensor go bad (hot exhaust - cold water).

If you're sure the power washing is what started the problem, what would other components could have been affected/altered by a high pressure stream of water?

[JHarris1385]

where is the o2 sensor?

I am throwing a multiple random cylinder misfire code.

[WILLY]

Power washing the engine compartment not a good idea,especially if the engine is hot,if you want to wash it do it when its cold or has only ran for a few minutes the do it with a gental spray not a full spray.

[Y33TREKker]

where is the o2 sensor?

I am throwing a multiple random cylinder misfire code.

I may have steered you in the wrong direction with that suggestion (O2 sensors). I was thinking of the O2 sensor locations on one of my other vehicles when that thought occured, but now that I've looked up the O2 sensor locations on a VX, I doubt that a high-pressure wash in the engine bay would have brought much water into contact with the O2 sensors. They're located more on the underside of the vehicle.

If I've interpreted the CD manual correctly, the cylinder misfire codes are based on crankshaft-position sensor (CPS - abbreviation) readings. These codes will be produced if the engine isn't running smoothly, which just causes the CPS to not be in the position it would/should normally be in when the readings are taken. In my opinion, that doesn't really narrow it down much though, because there are a few different things that can cause the engine to run rough in the first place.

I know the subject of spark plugs has been brought up. Have they been checked visually for cracks in the insulators, or possibly water in the spark plug wells? Those could cause misfires.

It may also be worthwhile to disconnect the crankshaft position sensor and apply some dielectric grease to the connector.

[JHarris1385]

So how would I get water out of the spark pulg wells.


Also where is the CP sensor?


Thanks.

[Y33TREKker]

So how would I get water out of the spark pulg wells.


Also where is the CP sensor?


Thanks.

Disconnect (-) battery cable, disconnect each ignition coil electrical connector, remove the two bolts that hold each ignition coil in place, then remove each ignition coil and spark plug boot by simultaneously pulling up and twisting back and forth the coil pack/plug boot assembly.

There may not be any water in the plug wells, but it should be plainly visible if there is any. Twisting up a paper towel and pushing it into the plug well would probably be enough to soak up any water that may be present. If there is any water present, you'd want to get it all soaked up before removing that spark plug.

The Crankshaft Position Sensor is located on the passengers' side of the engine block just to the rear of the motor mount.

Tones downloadable VX manual is located at the bottom of this page.

http://www.tonemonday.com/vxparts.html

The manual has a search feature that's very helpful too.

[Ldub]

Is it maybe a leak somewhere? Your tires also alter your speedo and odometer so you might be getting worse than 9 mph in actuality... not that you wanted to hear that... sorry! I hope you get it figured out soon.

Zeus,
Pardon me for sayin' so, but I've had a few fuel leak issues & if it was enough to decrease mileage, the olfactory sensor (nose ) would pick it up.

As for tires...larger tires rotate fewer times per mile, putting less numbers on the odo. ...for a point of reference, 33's are about 10% larger than stock.
When I figure mileage, I add 10% to whatever's on the trip & then divide by gallons...& it's still pretty dismal.

[ZEUS]

Zeus,
Pardon me for sayin' so, but I've had a few fuel leak issues & if it was enough to decrease mileage, the olfactory sensor (nose ) would pick it up.

Yeah, it could just be one of those "Jeep things you wouldn't understand"... you get so accustomed to huffing fumes on the trail with the top off; it always smells like it's leaking! Of course, maybe it always is!

[etlsport]

im pretty sure ive got a fuel leak somewhere.. my scangauge tells me i got 17mpg.. calculations tell me i got a hair under 16

[Chopper]

Regularly get 18-20 or so but this is Fla. that is Phila. and things are way different... I am from Bucks Co. a lifetime ago. 16,17 is not unreasonable in the city.

[garfull]

15 on my 2 tanks since ive gotten the vx.

[Jolly Roger VX'er]

During the summer months I was averaging from 18.5 to 19.2 mpg in PA. With the fall/winter weather moving in I got 15.3 mpg this last fill-up. My Monte Carlo dropped too from 25 mpg during summer to around 22/23 mpg.