Engine Performance problem
1999 Chevy Cavalier 4 cyl Front Wheel Drive Automatic
I am getting the PO200 error codes which means injectors. I am going to get a noid light and check each injector there. Is there a resistance or another test I can do?
Also, here's the readings I get from my code reader:
Cat: Not Ready
Evap: Not Ready
O2S: Not Ready
HO2S: Not Ready
the O2S and HO2S. How do I check that? And the EVAP? Where's that?
Looks like the PCM may be bad.
Is there a test I can do for the PCM?
Testing with noid lights, #1 and #2 injector lines are so very dull and Not flashing. #3 and #4 flash and are bright. Looking at the wiring diagram, seems that the 1 and 2 injectors may be on a separate connector block that plugs into the PCM.
#1 and #2 fail the noid test. Only a faint dim light for both injectors. #3 and 4 flash like they are supposed to. Looking at the wiring diagram, it looks like the greyish colored wires are common to all 4 injectors. Now in the diagram, connector points for the NON common contacts for the fuel injectors on the CPM are pt 19 (Black) for #1 injector and pt 20 (Lt grn/Blk) for #2 injector.
Connector points for the NONcommon contacts on the CPM are pt 17 (Pnk/Black) for #3 injector and pt 15 (Lt Blu/Blk) for #4 injector. Looks like separate banks of connections for the PCM. S there a way to check the PCM?
Did a voltage test on the injectors while running. Each had 12.4V across the grey wires with just the key on and NOT running. And zero on the other noncommon wires of each injector. Then ran connections of the negative lead of the multimeter to the positive of the battery. Measured across each connection. Each leg of the injector measured -12.4V across each lead to the positive of the battery. Trying to determine the ground leg. Its the grey. Diagram confirms that.
Then stripped back the wires on #1 and #3 since believe a problem in #1 and #2 injectors. #2 and #1 didn't read right. It looks like the PCM. Any ideas?
Seems that the injectors also measure low resistance. Somewhere I read that the resistance should be 11 to 18 ohms. Is this correct because I have 4 from my engine and 3 I have from a spare. They probably have 70K miles on them. Mine all measured 2.4 to 2.6 ohms. All 7 of mine could be bad? Hard to believe?
I will gladly donate when I get answers I need Thanks
have the same problem?
Sunday, September 5th, 2010 AT 7:38 PM