Here's the latest. I took the injectors out to replace the #4 injector, but the Auto Parts store didn't have any in stock, and would take a few days to get. So, I went ahead and swapped injectors #3 and #4. Started it up, and it exhibited same symptoms. Took and had the codes read, and got P0304 again. I asked them to reset the codes, so I could be sure this wasn't just left over from before. After the reset, even though the CEL would blink during idle, it would extinguish during normal driving. This continued until I got home, and later took it for another drive. After the CEL blinked during idle again, the CEL came on solid during normal driving, just as before. Had the code read again, and again got P0304. So, it would appear the injector is not the problem.
I tested the coil pack with everything disconnected per the hmaservice. Com site, and compared the readings to the specs. For the secondary coil resistance, between terminals 1&4 and 2&3, I read 14.5 kOhms vs. The 10.3-13.9 kOhms specified. For the primary coil resistance, between terminals 1 &4, I read an open vs. The 1 Ohm specified. I suppose this is indicative of a problem, but I am skeptical since I did temporarily replace the coil, but changed it back immediately after seeing the same symptoms at idle. The car was still missing at idle, and the CEL blinking. I did not drive the car at all with the new coil, so perhaps the ECM needed some time to reset?
Do you think this is the problem, or do you have some other suggestions?
Sunday, October 21st, 2007 AT 8:05 PM