2000 Cadillac DeVille - Page 4 - Answered Questions & Fixed issues

You need a test of the fuel pressure at the fuel rail while you are accelerating. When the engine is under load it is consuming the largest volume of fuel so if the fuel delivery system {pump;filter;lines pressure sensor} is challenged to keep up it will be most evident during acceleration.

Fuse # 19 in rear fuse box , Rear Fuse Block Left rear of the passenger compartment, under the rear seat

Check fuse and make sure the antenna is connected

Were the first two warranty problems with the part? If so, change brands and retest. If not there is possibly something else wrong , like the connector or wiring for the sensor.You should have the circuit diagnosed by a professional and determine the problem.

The only thing that comes to mind is a possible back-fire situation. The engine could be firing on the wrong cylinders which could cause fuel to explode in the intake damaging the MAF sensor. And the backfire could be something other than ignition related.

No, you should probably take it to a mechanic and have it checked out. Sometimes a simple gas treatment will help your car but if it hasn't been serviced in awhile ... take it in.

Take it to a dealer , they will look at it and give you the bill . Yes they will charge you to look at it and find the problem.

Could be the brake pedal switch which allows gears to change has become dislodged or failed.

Check your shop manual.

Do basic troubleshooting. Spark to plugs? Fuel pressure correct? Injector pulse?

you should be able to get to it from under the hood - maybe crowed under there but take a good look first

check all fuses first

check inside the trunk as they may be a cover over the tail light assembly _ there should be a bulb

The A.I.R. (secondary air) pump is located at the lower left side front of the car. You need to remove the car's front lower shield to get at it, and to the hoses and check valve connected to it.

Check out the link below, they are having the same problem as you are and trying to troubleshoot the issue. Good Luck.

Partially drain the radiator (drain is at the bottom on the driver's side of the radiator - you need to remove the front air deflector panel underneath the car to get at it). Remove the air cleaner assembly. Remove the outlet hose from the thermostat housing (this hose is the one attached to the top of the radiator on the driver's side - it is NOT the inlet hose which is routed across the top of the radiator). Remove the bolts holding the thermostat housing to the water pump, then the thermostat and gasket. Carefully clean off any gasket material from the water pump and housing, install the new thermostat and gasket, and reverse the procedure. Make absolutely sure you install the thermostat correctly - in must be installed in the same orientation as the old one.

Use the radiator drain at the bottom of the radiator on the driver's side. You will need to remove front air deflector panel under the car to get at it. Be sure to do this with a cold engine and remove the overflow tank pressure cap first. Note that this will not completely drain the system, but should be adequate for a coolant change.

P0741 - Torque converter clutch slip speed is exceeding limit; P1258 - High engine metal temperature. Sounds like you have transmission problems - torque converter problems can cause engine overloading, which in turn can cause the overheating. I would start with a complete transmission check before the engine is seriously damage the engine.

tried air filter? check for air leaks in lines, fuel filter, and fuel pump pressure

Sounds like an alternator problem...or voltage regulator inside the alternator