First things first.
Do you smell gasoline around the car when it's idling?
Is there any black smoke coming from the exhaust, especially under
acceleration?
Does the engine oil dipstick smell of gasoline at all?
How many miles does it have?
What is your measured MPG? (Should be calculated for several tanks, and
then averaged.)
----------- ----------- -----------
High fuel consumption can be caused by several things. One is that there is
something affecting the car's ability to roll down the road smoothly, like a
dragging brake, low tire pressure, or POOR FRONT END ALIGNMENT. Damaged
body work can also create an aerodynamic drag.
Another would be a mechanical problem in the driveline, like a slipping
transmission, for example.
Yet another would be an overly rich fuel mixture. This could be caused by:
1. Bad O2 sensor
2. Failure of the car to go into closed loop operation -- possibly
because of a bad thermostat not allowing the engine to warm up fully
Another possibility would be a poor fuel spray pattern due to a dirty or
clogged fuel injector.
Yet another would be a weak ignition system, but you should have that taken
care of.
Another still would be excessive blow-by caused by a worn engine (bad
cylinder ring sealing).
I would venture to guess that you should see well over 20MPG if it gets
driven at moderate highway speeds. The extended warmup period is NOT
helping; it has a fairly dramatic effect on the observed MPG of my own
vehicles when I use their remote starters. You might want to forgo the
long warmup periods until you get this sorted out.
Let us know what you figure out.
--
--Geoff
Cell: (313)506-7295
Sterling Heights CERT
'04 Grand Cherokee | '05 Town & Country
http://www.moparmailinglist.com
[Non-text portions of this message have been removed]
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