The safest way to check spark plugs is to connect an induction timing light to the #1 plug lead, and then to check the light pulse against the timing marks on the crankshaft pulley while an assistant cranks the engine. Locate the fuel pressure regulator, and isolate it from the system by inserting a piece of impermeable, but fuel resistant material between it and its attachment point. Each connector will only have two wires, so detach the connectors, and with an assistant cranking the engine, check the current in each, but also check that the current reaching all the connectors are the same.This procedure applies to diesel engines that are fitted with common rail injection technology as well, since the injectors are electronically controlled. Most mechanical fuel pumps have a weep hole on the bottom of the unit. 1. Mechanical fuel injection works well for naturally-aspirated or forced-induction engines and handles most any type of fuel â gas, ethanol blends, methanol, and even nitro blends. When did you last fill the tank? Return connector in injection pump plugged, due to governor coming apart. This arrangement allows the constant rotating motion of the camshaft or crankshaft to drive the arm. Find everything you need to k now about mechanical fuel injection as HOT ROD gives you tips on tuning, buying and setting up your first EFI system. Whereas the System overview 13 call for higher engine output was the Fuel supply 14 foremost consideration at the start of Fuel metering 18 the development work on gasoline Adapting to operating conditions 24 injection, today the target is to Supplementary functions 30 achieve higher fuel economy and Exhaust-gas treatment 32 lower toxic emissions. If a resistance builds up after a few operations of the pump but disappears again after a while, the pump is leaking air, and the only remedy is replacement of the complete filter assembly. Once you have a basic understanding of how something works, it becomes easier to devise a diagnostic strategy that is logical, to the point, but most importantly, effective. Some pumps are sealed and cannot be repaired; check to see if there are screws for dismantling. Pump repair and flow testing, EFI conversion. (Oil dilution.). While it can happen, the failure of these solenoid valves are rare, and it is more likely that there is an interruption in its power supply which keeps it in the closed position, thus starving the engine of fuel.Consult the manual to locate the fuse that protects this circuit. Set up Instructions for Blow Through Mechanical Systems. To install tool (B) in the fuel injection housing assembly, remove the 3/8â³-16 NC bolt from the flywheel and turn the flywheel approximately 30° clockwise. The HEUI uses engine lubrication oil that is pressurized from 6 MPa (870 psi) to 28 MPa (4050 psi) in order to pump fuel from the injector. 9. Restricted fuel return . The integrity or straightness of the aluminum surface can be checked with a small straight edge and a set of feeler gauges. Checking Fuel The Pump: Remove the air cleaner. =======================================================================, ====================================================================, How To Troubleshoot A Fuel Injection System, Changing a Fuel Filter on Injected Engines, Engine speed is slow to increase. To diagnose a fuel injector problem you need a keen sense of your vehicle, a little time and some basic fuel injector knowledge. Many inexpensive old-school vacuum testers can read mechanical fuel pump pressure just as well as vacuum pressure. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. Eventually, most cars sold with Chryslerâs fuel injection system were eventually retrofitted with 4-barrel carburetors as the patents for the Electrojector were sold to Bosch, who went on to develop an ⦠bent. Another common place for a fuel leak to develop is in the rubber hose and metal tube that leads from the tank to the fuel pump. However, if no fuel appears, verify the tank has gas and check the fuel line and fuel filter for blockages. Some of the symptoms mentioned above can be caused by defects in the emission control system, such as a clogged catalytic converter or a defective oxygen sensor; however, such failures are unlikely to be the problem in the absence of an illuminated warning light on the dashboard. If the mechanical pump is working correctly, it will push four to six ounces of gas into the bottle. Leaking injectors cause incomplete combustion because they enrich the air/fuel mixture to the point where it cannot combust fully.Any change in the way the engine idles when an injector is disconnected points either to that particular injection being defective, or perfectly normal, and it can be difficult to distinguish between which is which, even for professional mechanics if there is no fault data available. The following table is a guide to the fuel paths marked by each blue arrow in figure 6.4. When troubleshooting a fuel injection system, the most reliable way to distinguish between excessive mechanical wear and defects in the injection system, is to perform a compression test to eliminate low compression as the cause of many symptoms that resemble those of a defective injection system.Although gasoline engines are not quite as sensitive to compression losses as diesel engines, which depend on compression for combustion, it is nevertheless important to be sure that the compression â¦
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