2000 chevy Silverado code p0307

Ive donr alot of work on this truck. I had a few codes to get rid of. One is p0307 cylinder 7 miss fire. Ive changed all coils, spark plugs, wires. 1 o2 sensor, bank 1 on driver side. It just wont go out. The guy at midas said it could be a bunch of different things. Thats only code left. Is it injectors? What could it be?
Thanks
Experienced mechanics share their insights in answering this question :
Hi There,
A misfire may definitely be caused by many different things, however since you have addressed the majority of the usual issues that cause this, the next likely issue would in fact be a fuel injector that may be clogged or not spraying a uniform pattern of fuel, which may cause a misfire as well due to the incorrect amount of fuel being supplied to the motor. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

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What the P0307 code means. When the P0307 diagnostic trouble code is stored by the Powertrain Control Module (PCM), it is an indication that a misfire has been detected in cylinder 7. More specifically, the PCM detects an increase or decrease in crankshaft revolutions per minute (RPM) that exceeds 2%.
P0307 indicates that cylinder #7 is experiencing misfires.
An engine misfire can be caused by bad spark plugs or imbalanced air/fuel mixture. Driving with a misfire isn`t safe and can damage your engine.
Repairing or replacing a cylinder can range from $100 to $1,000. Different causes for misfires cause different severities of damage that each cost varying amounts to repair. These damages are: Slower fuel delivery issues can cost anywhere from $200 to $1,000.
The misfire detection monitor runs during normal engine operating and driving conditions, and is used by the PCM to determine whether the engine is malfunctioning to the point where it is releasing excess pollutants into the atmosphere.
Error Code P0300 indicates cylinder misfires. The letter P indicates an issue with your vehicle`s Powertrain.
To avoid an engine misfire, it is important to keep up with regular maintenance. Make sure that you change your spark plugs and oil filter as recommended by the manufacturer. Additionally, inspect your vehicle`s ignition system components for signs of wear or damage, and replace them when necessary.
Error code P0700 signifies that a malfunction has been detected in your vehicle`s transmission controls. Most modern automobiles feature a specific control module as it relates to the vehicle`s automatic transmission. This module is known as the Transmission Control Module (TCM).
The firing order for Chevy Big Block V8 engines (396, 406, 427, 454) is the same as the small blocks: 1-8-4-3-6-5-7-2.

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2000 chevy Silverado code p0307
ANSWER : Hi There,
A misfire may definitely be caused by many different things, however since you have addressed the majority of the usual issues that cause this, the next likely issue would in fact be a fuel injector that may be clogged or not spraying a uniform pattern of fuel, which may cause a misfire as well due to the incorrect amount of fuel being supplied to the motor. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

I have a Code P0601 on the PCM. I replaced the PCM, and now I have a code P0118, code P0123, and code P0193.
ANSWER : Hi there, the short answer to your question is no . A PCM with a P0601 (which is a memory module error in the PCM) cannot reliably retrieve codes for the codes you list (P0118 – coolant temp sensor, P0123 – throttle position sensor, P0193 – fuel rail pressure sensor.

Most likely, the P0601 prevents the PCM from getting any codes from the engine sensors. The memory module error may cause in data corruption for collected sensor values, lose of data over multiple sampling periods, or failure of the data collection to work at all. Replacing the PCM was a necessary expense.

If you need assistance with the "new" codes, I would recommend having a Check Engine Light inspection completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose the new error codes and get an accurate assessment of the repairs needed.

It threw a code 21 , throttle position sensor bad code. i replaced it and the code went away but i still have no spark.
ANSWER : Hello and thank you for contacting YourMechanic. The problems that you are encountering with your vehicle, could be caused by the harness to the Throttle Position Sensor (TPS) or the computer itself.

Check the harness to the TPS for any debris or any corrosion. Hook up a paperclip to the harness and turn on the key. Use a multimeter and check for voltage at the pins of the harness. Make sure that the ground on the sensor is grounded and has no resistance. If you find that the harness is having too much resistance, then I recommend having the main engine harness replaced. If you have replaced the harness and still have the same problems, then the computer will need to be flashed or replaced.

I recommend having a professional, like one from YourMechanic, come to your home to diagnose your car’s no start condition before replacing any parts.

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ANSWER : Once a trouble code is erased, it cannot be retrieved. The engine controller does not have a "recycle bin" like they have on Windows. If the car still has a problem, the code will come back up after some driving. However, the controller will not turn on the CEL until it has seen the malfunction on two separate "trips." A "trip" is a driving cycle where the car is started cold, driven until it is fully warm and through a certain number of accelerations, and shut down. So you might not see the CEL for a couple of days. As for the "head gasket sealer," I wouldn’t hold out too much hope of that solving a problem. At the very best it might put off the symptoms for a short while. If you need help interpreting codes that come up, or solving a head gasket issue, contact Your Mechanic. They can send a technician to your home or office to read the codes on your car and help you decide what to do.

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I have a 2000 Chevy Silverado 4×4 with 123,000 miles on it. Had to have it towed home after it died. Won’t stay running.
ANSWER : Hi there. Have you checked for any problem codes, whether the Check Engine light is on or not? Those codes, if any, will expedite accurate diagnosis and lower cost to repair.

I would check the fuel pump relay. The contacts in them can burn, in which case, they will run the pump (often poorly) for a few seconds, but can’t keep it running because the contacts get hot and won’t pass current.

This could also from a fuel restriction or failed fuel pressure regulator. If spritzing some starter fluid allows you to start the engine for a brief moment, that confirms it’s a fuel supply/pressure issue.

A failed crankshaft or cam position sensor are candidates if there is not spark at the plugs.

To have this all scoped out, I recommend having a certified professional, like one from YourMechanic, diagnose the stalling problem so that this can be repaired correctly.