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David Hunter
Guest
After installing 265's on my D II my service engine light came on. Is there a simple permanent fix?
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David Hunter
Guest
I replaced my tires and drove about 3 mi. then the light came on. I assumed it was from the difference between the spedo and tach with the new tires. Now, the next day, I jump in the car to go read the codes and the light is off. I don't know what the code was. I guess it can't be read now that the light is no longer on.
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roverX
Guest
Even though the light is now off, wouldn't the code still stay in the computer until it is cleared? Then couldn't he still go to AutoZone and read the code?
Also...thanx for the DVD's Will, my boys loved them! I owe you a bottle of Kettle One next trip.
Also...thanx for the DVD's Will, my boys loved them! I owe you a bottle of Kettle One next trip.
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David Hunter
Guest
Pugsly, These figures are not right, but you will get the idea anyway. Lets say when you are going 70 mph with the factory tires it is 2800 rpm. Then you put on larger tires, that same 70 mph is now 2500 rpm.
the truck is blind to the true road speed.
where the problem stems from on some vehichles (GM mostly) is the throttle position to engine vacume to selected gear ratio changes because the engine is under a heavier load
the code comes up as "drive ratio incorrect"...there is a inline value device from a number of performance chip companies that corrects this...but I havent seen one for rovers, and I havent seen anyone need one either.
where the problem stems from on some vehichles (GM mostly) is the throttle position to engine vacume to selected gear ratio changes because the engine is under a heavier load
the code comes up as "drive ratio incorrect"...there is a inline value device from a number of performance chip companies that corrects this...but I havent seen one for rovers, and I havent seen anyone need one either.
David Hunter said:
Yes, it's a 3rd or 4th gear transmission problem. Not sure what the resolution is, had it myself off and on for a while. Now I have 285/55's on and it doesn't happen. I remember having the codes cleared a few times. Sorry. There might even have been a recall? Maybe Alyssa remembers?
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Yes, but the truck does not know that it is traveling at a higher speed, unless you have changed the gearing in the speedometer pickup somehow. The speedometer just shows the speed at which the driveshaft is turning, not the true road speed.David Hunter said:
Interestingly, when I put larger tires (33") on my Defender, the speedometer became more accurate... and it is still a little off. If I go up another size maybe the speedo will finally be correct!
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David Hunter
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David Hunter
Guest
I thought this would be a common problem. I can tell the transmission shift points have changed since the tire change. I know on a GM you can just change the tire size in the computer and all is good. That is, if you are running a size that is pre programed to select from.
I don't think you can do that on a Land Rover. I know people have switched in programmable/adjustable speedometers, and there is also an adapter box that people fit to correct the speedo for different tire sizes. I just use my GPS for speed and don't worry about it.David Hunter said:
The shift points have changed probably because the ECU is basing it on the engine load - on old tran-nys it used to just be a vacuum sense, probably different on these newfangled ones!