- Do you still have the egr codes? A problem with a knock sensor can be related to a defective egr system
Also, we talked a good bit about the egr because of the codes you were getting, but have you ever checked your timing and compression?
- You can start with a good injectors cleaner; it may help. Make sure you fill your tank with good quality gas from a reputable company: cheap gas contains less additives which can quickly result in your injection system getting clogged-up (You ve seen the Shell commercial haven t you?). Moreover, cheap gas may not have the proper octane level which can result in your engine detonating.
You could also have your injectors cleaned at a shop either by running some cleaner at the fuel rail while the engine is running, or by removing the injectors altogether.
The " off-car cleaning option would give the best result and your injectors could be flow tested; but it is more expensive.
To know for sure if you have dirty injectors, you can perform a fuel pressure drop test:
Here is the procedure you can find online:
This test measures the drop in static system fuel pressure when each injector is energized. The amount of pressure drop for each injector is then compared to see if the injectors are dirty and need to be cleaned or replaced. This test requires an "injector pulser" ($90 on Amazon) tool to energize the injectors.
To perform this test, turn the key on or energize the fuel pump for a few seconds to build up static pressure in the fuel system. Then turn the key off, pulse one injector for the specified time and note the pressure drop for that injector. Turn the key back on to rebuild static pressure and repeat the test for each of the remaining injectors.
An injector that is pulsed 100 times for five milliseconds should produce a minimum pressure drop of about 1 to 3 psi, and no more than 5 to 7 psi, depending on the application.
The difference in pressure drop between all the injectors should be 2 psi or less. If you see more than 3 psi difference between the highest and lowest readings, the injectors are dirty and need to be cleaned or replaced.
If you see no pressure drop when an injector is energized, the injector is clogged or defective and needs to be replaced. If the pressure gauge needle bounces, the injector is sticking."
- As far as the wiring diagrams you could check " alldatadiy or " . They both offer factory wiring diagram as well as just about any info you need to fix your car.
Thursday, December 4th, 2008 AT 6:53 PM