RPM's @ 60 MPH? tranny issue?
#1
12-15-2008, 06:38 PM
RPM's @ 60 MPH? tranny issue?
I have a 2000 accord with the v6. 126k miles with all the appropriate maint. done to it at 100 k.
I have noticed that on the highway, it seems to be running at higher rpm's than it used to and the gas mileage has been pretty poor.
At 60 mph on flat highway the car runs about 2200 rpm's and that seems kind of high to me.... Wondering if maybe I have a transmission issue of iot not going into OD or something?? any thoughts on this would be greatly appreciated. Thanks.
I have noticed that on the highway, it seems to be running at higher rpm's than it used to and the gas mileage has been pretty poor.
At 60 mph on flat highway the car runs about 2200 rpm's and that seems kind of high to me.... Wondering if maybe I have a transmission issue of iot not going into OD or something?? any thoughts on this would be greatly appreciated. Thanks.
#2
12-16-2008, 07:40 AM
RE: RPM's @ 60 MPH? tranny issue?
Try Seafoam in the brake booster line, Marvel Mystery Oil in the oil and Lucas in the gas ...... also new spark plugs, wires, rotor, cap and coolant.
#4
12-16-2008, 09:18 AM
RE: RPM's @ 60 MPH? tranny issue?
If the lock-up (LU) torque converter is electrically at fault (short or open), it will set a code and Check Engine Light will be on. A hydraulic fault will also set a code, P0740 (burned in my brain as I have this on a 97 Acura TL). If no codes set, the rpms should be correct regardless of engine condition. Engine misfire will also set a code.
A good way to confirm LU is occurring is to approach a slight grade w/ speed control set to 60 mph and watch rpm's. If LU is working correctly rpm's should stay almost constant. It will not be perfect since speed control will drift slightly low before correcting and overspeed on downslope. However you should see < +/- 50 rpms depending on how close your speed control works. If LU is not occurring, you will see rpm's increase (100-200 rpm) as engine power is added on upgrade, and rpm's decrease on downgrade. Won't work w/ a really steep hill.
I've noticed that many folks in northern climes complain of poorer gas mileage in cold weather. This may be a function of gas change to increase reid vapor pressure (easier starting), longer warm-up time to operating temp will increase gas consumption, warming car before driving (0 mpg), and increased wind resistance of colder air (true but probably trivial).
Looking at weather in Northern states this year makes me appreciate Houston. Yes, it's hot as Hades in summer and we have hurricanes, so pick your poison. I'll take heat and hurricanes.
good luck
A good way to confirm LU is occurring is to approach a slight grade w/ speed control set to 60 mph and watch rpm's. If LU is working correctly rpm's should stay almost constant. It will not be perfect since speed control will drift slightly low before correcting and overspeed on downslope. However you should see < +/- 50 rpms depending on how close your speed control works. If LU is not occurring, you will see rpm's increase (100-200 rpm) as engine power is added on upgrade, and rpm's decrease on downgrade. Won't work w/ a really steep hill.
I've noticed that many folks in northern climes complain of poorer gas mileage in cold weather. This may be a function of gas change to increase reid vapor pressure (easier starting), longer warm-up time to operating temp will increase gas consumption, warming car before driving (0 mpg), and increased wind resistance of colder air (true but probably trivial).
Looking at weather in Northern states this year makes me appreciate Houston. Yes, it's hot as Hades in summer and we have hurricanes, so pick your poison. I'll take heat and hurricanes.
good luck
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