Re: engine light and cuts out at freeways speed when...
Have you changed your fuel filter lately? I had a vehicle once whose fuel tank that had a rusty seam. Every 10,000 miles or so, the rust flakes would clog the fuel filter, and the engine would sputter and stall when the vehicle was climbing uphill. If you idled for a bit, you could drive on for a ways, until the same thing happened.
A nearly dead fuel pump could cause the same problem, I suppose.
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That is the way gears in cars work. When you go up hill, the car needs more gas, so you put your foot down, kick down comes into play and the gearbox chooses one gear lower, for more engine revs and lower speed you get more torque to climb the hill.
Get the car tuned up, you might have failing sensors or ignition problems causing a general loss of power that is needing kick down on hills.
What you are describing sounds normal. RPM's stand for revolutions per minute. Each minute your engine is running, the pistons are going up and down. When you are not going anywhere, your engine is idling and so the RPM's should NOT be very high. However, when you race up a hill, your RPM's SHOULD be high because your engine has to work hard to climb the hill or to go fast.
Idle speed= 650 Revolutions Per Minute. That means your engine cylinders each work 650 times in One minute.
At freeway speeds, your engine will revolve somewhere between 1600 and 2100 times per minute. I hope that helps.
the p38 is a bit sluggish and slow on long steep hills, really not geared for performance but more as a piece of heavy equipment. strong horsepower wise very formidable powertrain but you're not going to have that get up and go that many drivers look for. couple quick suggestions you may want to check your plugs and wires a common weak spot in the ignition system, and i might suggest also running i can of seafoam through your engine. you deposit in your gas tank runs through with the half a tank of gas. i'm not a big advocate of fuel additives or octane boosters but in the case of seafoam it's definitely a worthwhile and proven product. don't forget also your sport mode button down next to your shift lever push that button down and it keeps your transmission from overdrive so you can accelerate into freeway traffic and climb hills without your transmission shifting
Read the engine light on the OBDII then post the code if your code reader doesnt have the explanation of the code ,although i would suspect a faulty O2 sensor not giving the right fuel ratio but ? iam always wrong here when i guess things
Most modern automatic transmissions have a chip in them that will prevent the car from downshifting, say, into first gear when you're moving at 60 mph. Still, I wouldn't try it. When climbing a hill, only downshift if the AT can't decide which gear to be in and switches back and forth--choose the lower one. When descending use brakes to decelerate. However, once you've braked, do use a low gear to coast in, to prevent you from freely accelerating down the hill. ------------------------------------------------------------------------------ GM Tech2 GM Diagnostic Scanner With C card