hi,
there is no way to test the optical sensor, what problem does the truck have? is the lift pump working?. you can't ohm out the fuel driver, it can only be replaced. make sure to take the chip out of the old driver and put it in the new one when you replace it or you will have all knids of problems chec the power feed from the ign switch to the injection pump for going below 12 volts, probably have to put meter on min/max. or else fuel driver is bad or optical sensor in pump is missing cam counts causing it to stall
what model is this please ,does it have a europeon version and if so whats it called ,should imagine you just remove a cover on the back of the headlight unit too gain access
ball joints and or wheel bearings ppossibly . jack the vehicle up off the groungd physically try to move the tire up and down and side to side feeling for any loosness in the wheel. do this on both sides:-) good luck
its probably a sensor or fuse maybe, i'm just guessing, or it could be a in line fuse, thats where two wires come together, and it is connected with a red or yellow connector some times they are blue, they are covered in plastic, metal in middle
Good place to get a vacuum gauge hooked up and identify problems using that tool. Without the gauge, check your exhaust and see how much if passing through the converter. You can do this by testing the temperature of the exhaust before and after the converter making sure the converter/exhaust isn't restricted. As the vehicle warms up a bad converter can cause the symptoms you are describing.
2CarPros
https://www.2carpros.com > ... > Location
Dec 27, 2021 - Hello, this vehicle has two oxygen sensors, the rear one is behind the Catalytic Converter. Below is a picture of its location to the right side .
..
The C0292 code in your 2004 GMC Yukon Denali XL indicates a communication issue between the Powertrain Control Module (PCM) and the Electronic Brake Control Module (EBCM). Here are some steps to diagnose and potentially fix the problem:
Check Ground Connections:
Inspect the ground connections related to the PCM and EBCM.
Follow the ECM ground and ABS module ground.
Check the ground on the firewall (driver's side) and the frame rail under the driver's seat.
Also, verify the engine ground on the driver's side.
Inspect Wiring and Connectors:
Visually examine the wiring harness and connectors associated with the EBCM.
Look for any signs of damage, such as broken wires or corroded pins.
Ensure that the connector pins are not bent or pushed out.
Pay attention to any loose or poor electrical connections.
Consider the Tune:
If you've recently modified the vehicle's tuning, consider reverting to a different tune.
Sometimes, a specific tune can cause communication issues.
If you suspect the tune, contact the tuner for further guidance1.
Professional Diagnosis:
If the above steps don't resolve the issue, it's advisable to seek professional help.
A qualified mechanic can perform a thorough diagnosis using specialized tools.
Keep in mind that diagnostic costs typically range from $75 to $150 per hour.
It is not legal to 'adjust' speedometers.
Fit the correct sized rims and tyres and the speedometer reading will be correct or use a satnav for real time speed.
Fuel injectors are typically driven directly by power transistors in the engine computer. Relays are just not fast enough to provide the fine timing control needed. There might be an individual fuse for each injector soldered to the computer board, but I haven't ever looked at one for your model, and I've never seen injectors individually fused. Before chasing that, verify that the electrical resistance of the injector coil is the same as the other injectors. The typical resistance is between 100 and 1000 Ohms. If the coil resistance differs by more than 10%, replace the injector coil (it may be easier to remove the coil from a new injector and switch it with the old one than to pull the entire injector out and replace it, if not, change the injector). Shorts in the coil that lower the resistance are sometimes a problem.
Also check the injector cable for continuity. An easy way is with an ohmmeter that can read at least 20 Megohms. First, check the resistance between the terminals on a good cable. You should read a very high resistance - this is the leakage through the transistor and any protective components, and is some number between 5 and 20 megohms. The exact number doesn't matter, as long as you see something and it is not a short circuit (less than 1 Ohm). This verifies that the test will work (if it reads over-range, either your probe tips can't reach the contacts in the connector, or the test is otherwise not valid). Next, repeat on injector 1. If it reads open circuit (over-range), check the injector cable (note: an open fuse will give the same result as a broken wire).
Backfiring can be caused by leaking valves, (compression leak test will show this), an air leak in the inlet manifold, incorrect timing. incorrect mixture or an air leak in the exhaust manifold.
Very undesirable as it can lead to engine damage.
Time to get your test gear out and find out where the damage is.
(Replacement 'computers', in some vehiles, don't normally work unless they have been reprogrammed with the rest of the system).
when you disconnected the battery you cleared all codes and your emissions[ smog/emissions need to run their cycles to be smog test ready as of now you will fail test ------https://smogcheckvacaville.com/general-motors-drive-cycle-for-smog-check/ ------------------https://repairpal.com/how-to-perform-a-basic-drive-cycle