I recently installed a used engine and new alternator in my 2004 Envoy XL SLS. All went well, once installed and everything hooked up I started it and it runs great. The issue is that when you put it in gear and start to accelerate its like you turned the key off (all gauges go to minimum, radio turns off, Ac turns off, etc). It also does this just by holding brake (while in drive) and giving it some gas. When you let up on the gas pedal all power returns. In park you can rev the engine and all is well (no electrical power loss). It seems that when engine is under a load then all electrical power is lost?
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This is normal. All vehicles idle high at start up to get the engine to operating temperature. This is known as open loop. The computer ignores signals from O2 sensors to keep your engine running safely. Once it has warmed up, it will enter closed loop, and you will see a decrease in idle.
On a 2004 GMC Envoy xl v6, the alternator has 3 mounting bolts, 2 on top, 1 on bottom. best advice is to disconnect the electrical circuits to the alternator first before removing the mounting bolts. then take off the bottom bolt, followed by the 2 on top. then just slide it out and your done.
Hi It me Mohammad Siddiq my dear. First of all it will be wise of use to take your vehicle to a dealership or any other fully equipped w/shop. They can better tell you what the fault your vehicle has. But at the same time if your friend has the same model vehicle so you can exchange some parts with that vegicle, e.g., Mass Air Flow or TPS (Throttle Position Sensor) and can check your vehicle. These parts do not need to be programmed with scan tool. Just Simply replace these parts and switch on the ignition and wait for 01 minute, then switch off for 30 seconds and then start the engine. Now road test your vehicle, if no SES light or reduced power then there was fault with the part/s replaced. So Return those parts and now you must replace these parts with new or used ones. Anything else I may be contacted on my yahoo id firstname.lastname@example.org. Thanks. I am an auto technician and working in a GM dealership in Saudi Arabia. I am from Pakistan.
HELLO, WISH I HAD U AROUND WHEN MINE WONT START,L.O.L U KNOW JUST BECAUSE THE BATTERY IS FULLY DOEST MEAN IT HAS ENOUGH CURRENT TO START YOUR CAR MULTIPLE TIMES! U SEE 12 VOLTS AND CRANKING POWER ARE TWO DIFFERENT THINGS! SEE YOUR ALTERNATOR IS USED TO KEPT THE BATTERY CHARGED SO IT CAN START YOUR CAR AFTER THE CAR STARTS THE ENTIRE ELECTRICAL SYSTEM IS POWERED BY THE ALTERNATOR NOT THE BATTERY,THE ONLY TIMES THE BATTERY IS USED IS TO START THE CAR AND SUPPLY POWER TO THE ELECTRICAL SYSTEM IF THE ENGINE SHUTS OFF! HAVE A LOAD TEST DONE ON YOUR BATTERY TO MAKE SURE ITS OK AND AT THE SAME TIME HAVE THEM DO A ALTERNATOR TEST AND MAKE SURE ITS OK, THEIR ARE A COUPLE OF NATIONAL AUTO SUPPLY STORES THAT WILL DO THIS TEST FREE AND WILL INSTALL A BATTERY IF FOUND BAD, AN ALTERNATOR COULD BE VERY MUCH DIFFERENT!(HOPE ITS NOT THAT) ONE THING U COULD DO YOUR SELF IS REMOVE BOTH BATTERY CABLES AND CLEAN THEM WITH A WIRE BRUSH,THE POST AND THE CABLES AND RE INSTALL GOOD AND TIGHT SO THEY CANT BE TURNED BY HAND. SO I HOPE THIS HELPS, BATTERY'S SHOULD BE THROUGHEN OUT EVER THREE YEARS,GOOD LUCK TO U.
I also have an '04 Envoy XL. The problem we had was very similar. The truck lost power and the wife and kids were stuck on the interstate. It was the catalytic converter totally clogged. We were told by our trusted mechanic that we were lucky not to have blown a head gasket from the back pressure. Two days after having the converter replaced the check engine light came on. I went to Autozone to have the codes read. I don't remember the code number but it was basically that the thermostat was stuck open and the engine was running too cool causing it to run rich and clog the converter. I did not get a light until after and the light went out on it's own. I hope this helps you. GOOD LUCK!
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.