• 4803 Answers SOURCE: The black soot on the plugs means that you are running extremely rich. The fuel injectors ma test good electricly, but they are notorious for leaks.

GM 5.7 liter Vortec. We encourage you to read this manual thoroughly before you. 1.Our Magna Charger kits are designed for engines in good mechanical. Diagnostic help on 1. I would get someone to fix the check engine light issue. I would start with that and the rest may resolve. Here is the proper way to.

The spider-looking thing sandwiched between the plastic intake plenum and the intake manifold gets cracks in it's 'legs' and leaks fuel ito the plenum area. The fuel pressure regulator is also housed in this same assembly. If the diaphram in the regulator gets a pinhole in it, it also leaks fuel into the plenum area, causing all kinds of erratic idleing, black smoke from the exhaust, and will cause your fuel trims to drop into the negative 20s. There is a technical service bulletin covering this subject.

Frutiger Roman Font here. Openproj Example Files. This procedure outlines the steps required to replace the existing Central SFI Fuel System with a new MFI (Multiport Flexible Injection) Fuel System. It is removing the injectors which are all housed in the center body of the injector assembly and replacing them with a new version where the injectors are located where the ols 'poppets' used to be in the intake manifold ports. The picture below is for a V-8 engine that is covered by the same TSB. The poppets and the pressure regulator are available individually to fix your existing fuel injection system, but I gave up on that after replacing several poppets only to have them come back in a few months with another popet line broken. I recommend replacing the whole assembly with the new and improved version. My customers have told me after doing this that the engine never ran that smooth when it was new.

The GM part number for the new injector assembly for your V-6 engine is 12568332 it is also now available at several aftermarket parts outlets. As for the timing chain solution posted by doodieman200, all I have to say is that I have enough fingers on one hand to count all of the failed timing chains I have replaced on these engines. If you don't have a cam/crank sync code, the timing chain has definitely not slipped a tooth. Posted on Oct 18, 2009.

• 17970 Answers SOURCE: P0300 - Random/Multiple Cylinder Misfire Detected Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. Symptoms may include: * the engine may be harder to start * the engine may stumble / stumble, and/or hesitate * other symptoms may also be present Causes: A code P0300 may mean that one or more of the following has happened: * Faulty spark plugs or wires * Faulty coil (pack) * Faulty oxygen sensor(s) * Faulty fuel injector(s) * Burned exhaust valve * Faulty catalytic converter(s) * Stuck/blocked EGR valve / passages * Faulty camshaft position sensor * Defective computer Possible Solutions: * If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. * If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e.

Spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced.

I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open. About the your previous code (P0301), this code will trigger the check engine light as follows: The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow.