C4 Fuel Injection Overview . It was also used on the 1. Speed density uses a manifold absolute pressure sensor (MAP sensor) to calculate the necessary fuel load. The 1. 99. 0- 1. 99.
MAP sensor bolted directly to the intake plenum. The 1. 99. 2- 1. 99. MAP sensor bolted to the intake manifold. The throttle position sensor, coolant temperature sensor, and intake air temperature sensor are also used to calculate fuel. Mass- air flow fuel control was introduced in 1. It was reintroduced in 1. The 1. 98. 5- 1. 98. This porting hurts power output. The 1. 98. 9 cold start event is handled by the PROM (chip). Effect of a Multifactorial Intervention on Mortality in Type 2 Diabetes. Lightroom CC 2015.6 and Lightroom 6.6 are now available. The goal of this release is to provide additional camera raw support, lens profile support and. Tectonic refers to the art and science of structure and was chosen to emphasize the company’s interest in construction– how things are made, and. The fuel injector pulsewidth was increased. The OBD system was introduced to bring diagnostic uniformity to all makes and manufacturers. The 1. 99. 4- 1. 99. OBD computer system utilizes mass- air and MAP sensors to control fuel delivery. The 1. 99. 4- 1. 99. These cars have better fuel control and respond better to high performance modifications. The 1. 99. 5- 1. 99. OBDII fuel control systems that follow more stringent fuel emission control standards. Catalytic converters have oxygen sensors checking their performance as well as controlling fuel in closed loop. Troubleshooting Basic Engine Control Module (ECM) Failures. The most important thing to remember when troubleshooting a computer- controlled fuel injection system is to check the basics first. Many times the first thought is to condemn the computer; it rarely fails. Check all connections, especially the computer grounds when intermittent conditions occur. A good battery and battery cables are very important. If you have constant problems with dead batteries you can damage your Engine Control Module (ECM) from a voltage spike. It is very rare that a sensor fails and the Service Engine Soon (SES) light is not lit to warn of a problem. Therefore, you most likely have a basic fuel or ignition problem if the Service Engine Soon light is not on. There is an exception to the rule with an ECM: the 1. ECM can cause a hard start condition that acts like a flooded engine when starting. The 1. 99. 0- 1. 99. ECM can cause a stall intermittently and I have found a few 1. ECM. This elevated temperature occurs when the ECM goes into a limp home mode. I have seen a few ECM. Anytime you see multiple codes and strange readings, most likely the ECM has failed. The later 1. 99. 2- 1. ECM and the 1. 99. PCM (Powertrain Control Module) has a better success rate. It is rare that an ECM will turn on the Service Engine Soon light when a short- cycle intermittent failure occurs. I have also found that usually you can rap on a failed ECM with your fist and make the engine stall or start. Anytime an ECM or PCM has failed all the control solenoids must be checked for shorts to ground. I check all control solenoids at the ECM or PCM connector for shorts to ground; this will test for a possible shorted wire also. The control solenoids must have at least 2. A factory service manual has the necessary information to locate the control solenoid wire position for testing. The testing should be done at the ECM connector. This way the wiring itself can be tested for possible shorting to ground. The most important tool to use when trouble- shooting is a good memory or notes. If necessary, write down as many pieces of information as possible. This will help compile a troubleshooting workbook. A service manual is also a very important diagnosis tool. During road testing I take notes detailing when a problem occurs: hot engine, cold engine, or possibly after a hot restart, etc. In the shop I try to get as much information as possible about any previous repairs and parts that have been replaced. A simple audio test of the engine. Listen to the engine as it cranks over. An engine that has comparable compression on all cylinders has an even rhythm as it cranks over. If you hear what sounds like a rhythmic increase or uneven pulses during cranking, most likely a cylinder(s) have low compression, which may be caused by a burned valve or possibly a hole in a piston. If a cranking problem is encountered a compression test should be performed. Crankcase pressure test. If compression seems to be okay during cranking, the next test I would perform is a crankcase pressure test. A crankcase pressure test consists of removing the PCV valve and breather tube on an engine that is at operating temperature. Watch for oil vapors coming out of the PCV valve port.
0 Comments
Leave a Reply. |
Authordcmilin Archives
January 2017
Categories |