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The steps I'm going to outline are the same as we use in my shop for hesitation, sag and stumble.
All of the tools required can be borrowed from AutoZone at NO COST!
- The sensors can be checked with an OBD-II code scanner borrowed from AutoZone. Pay special attention to an TP (Throttle Position) warnings. The sensor can be manually checked for binding or sticking.
- Check the Heated Oxygen Sensor (HO2S) found near the firewall and screwed into the exhaust manifold for signs of corrosion on the threads. That will cause a faulty ground.
- Check the fuel pressure with that fuel pressure gauge from AutoZone. You reading should be 40-45 PSI and holding steady.
- Contaminated fuel is a constant problem and if the pressure does not hold steady, replace the fuel filter.
- Make certain that the engine thermostat is functioning and is the correct temperature.
- Make certain that the alternator voltage output is not less than 9 volts nor more than 17 volts.
Here's a little general information that will assist you in comprehending the readouts from the code scanner. This is simply for your edification. You may be aware of all this but we've never done business before and all assumptions are off the table.
For an engine - make that any engine and irrespective of manufacturer - to run, you need three things to happen inside the engine, compression, fuel and ignition, without any one of these components the engine will not run.
- Compression - Engine compression caused by crankshaft rotation and pistons moving up and down inside the engine block. If the timing belt or timing chain fails it will cause the camshaft to become out of correlation with the crankshaft or allow the camshaft to stop rotating. Either of these conditions will cause the engine to lose compression and sometimes cause internal engine damage.
- Fuel Delivery System - The fuel system includes: fuel pump, fuel injectors, pressure regulator, fuel filter and pressure lines. This system is used to supply fuel under pressure to the fuel injection system, the lack of fuel pressure or volume will cause the fuel delivery system to fail and the engine to stall or not start.
- Ignition Spark Delivery System - The ignition system components include: spark plugs, spark plug wires, distributor (if applicable), crankshaft angle sensor, camshaft angle sensor, ignition coil, ignition module, knock sensor and PCM (powertrain control module). The engine relies on the ignition spark to be delivered to the combustion camber at the correct time. If the ignition spark stops or is delivered at the wrong time the engine will not run or run poorly.
The Wells Company offers extensive code diagnosis application information and technical support via its Tech Line at 1-800-558-9770, as well as in-depth product and repair videos at www.repairpath.com
(use mny personal access code carrepair
) and through the "Wellstech" channel at www.YouTube.com