When driving on the highway and holding my speed to a steady 50 to 55 mph, the car will start lurching, on and off, on and off, etc. The tach will jump with the lurch. It is not everytime I am doing highway driving, but will happen about 8 out of 10 times on the highway. Usually will start when I am going up a hill, but continues it on the straight stretch. I have been to 3 mechanics...nobody knows what is wrong. Help, please!! (good thing I do mostly city driving. no problem there).
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Re: Highway driving problem. City driving ok.
If you have been to three shops,I'll assume that all the basics have been covered. Did anyone check computer stored codes? What did they see? If you are going to try to fix it yourself, you will need to get a manual and check each and every component, one by one. Also, outside of the realm of computer stuff, check converter to make sure its not partially plugged. At low rpm city driving it may be flowing just enough to get by on. Also check that fuel is clean and has no water in it.
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code p0320 refers to cam shaft position (CKP) sensor/engine speed (RPM) sensor--circuit malfunction=== causes --wiring--CKP/RPM sensor ---ECM
because the engine runs ok until it is on cruise control I would be investigating the RPM sensor for a fault
The cruise control takes its control from the RPM sensor and if that circuit is interminable the the cruise control doesn't know what rpms to maintain.
Driving habits are the main reason for bad mileage including: excessive idling, fast starts and stops, fast driving in general...best speeds are 50 to 60 MPH for economy, city driving uses most gas, Mechanical problems include underinflated tires, leaving windows open at highway speeds, not keeping engine tuned up, not changing lubricants at proper intervals, not greasing wheel bearings, not aligning and balancing tires..etc
A 99 sonoma 2wd 2.2L 4cyl with the 4 speed auto will get 22mpg on average, 19mpg in the city and 26mpg on highway 4.3 6cyl 4wd with 4 speed auto will get 18 combined average, city 16 and highway 21. 4.3 2wd auto will get 18 combined average, city 17 and highway 22. 4.3 5 speed manual 2wd will get 19 combined, 17 city and 23 highway. 4.3 4wd 5 speed manual will get 18 combined, 17 city and 21 highway. These estimates from an online source, my buddy has the 4.3 4 speed auto 4x4 and he averages about 16 on average. hope this helps.
It needs a "drive cycle". Start & run it, highway speeds, and then pull over & idle several times, then do city traffic "stop & go" driving, and then sustained highway speeds again. This completes the readiness thest and satisfys all of the monitors.
Compare Fuel Estimates for 2006 Mitsubishi Raider Trucks Here's a comparison of EPA fuel economy ratings among the trucks in the 2006 Mitsubishi Raider lineup. As always, your mileage will very likely differ. 2006 Mitsubishi Raider 2WD 6-cylinder Trucks * 3.7L, 6-speed manual, 16 city / 22 highway * 3.7L, 4-speed automatic, 16 city / 22 highway * 3.7L, 6-speed manual, 16 city / 20 highway