Hi everyone,
I have been reading this forum since I bought my 2002 TB I6 in 2004 and have been helped numerous times by the advice posted. This time, I haven't had much luck fixing my problem after reading through the forums multiple times. Here's my issue:
I have about 66,000 miles on my TB. About two weeks ago, I stopped at a light and all the sudden the engine started running really rough. By the time the light changed the SES light was on solid. As I accelerated from the light, the engine continued to run rough until I was up to around 2.5K RPMs and it seemed to smooth out. At that point the SES light went from solid to blinking. When I slowed down again, the engine started running rougher the slower I got and the SES light went back to solid. I also noticed my gas mileage dropped from around 14 to 10.
I jumped on the forum and started reading when I got home. Based on the information I found, I decided to try a bottle of fuel injector cleaner first. I bought a bottle of Gummout and it didn't make a difference. The next step for me was to check for the spark plug wells filling up with water. I took a look at all the coils and found coil #5 had a bunch of white chalky material on it and carbon inside the boot. I went ahead and bought a coil pack from Autozone and replaced the #5 coil/boot (disconnected the negative battery terminal to clear the SES light). This did not make a difference. The rough idle is still there and the SES is back.
On to plan B - I know a guy at work who owns code reader software (Autotap) and the interface plug. I loaded it up on my laptop, plugged it in and it had a P0301 - Cylinder 1 missfire code. I then started up the vehicle and after running a minute it threw out a P0300 - multiple missfire detected code. I then cleared the codes and the P0300 came back. I then used the software to set up specific monitors for each cylinder and found the cylinder two was continually missfiring but not any others. The only exception to that is that if I rev the engine to over 3K RPM, cylinder 5 starts to missfire a little as well (but only when over 3K). The funny thing is, I never get a P0302 code, always P0300 (and the P0301 hasn't come back either)... So with this info, I decided to try the spark plugs and to move the coils around to see if the missfires would move to a different cylinder. I bought AC Delco plugs, put them in and no difference. I then swapped the #2 and #5 (new one) coils and saw no difference either.
I'm not sure what my next step should be... I don't know if the Catylitic converter could be the culprit, or the fuel filter, compression, etc... Any help would be greatly appreciated!
Glen
I have been reading this forum since I bought my 2002 TB I6 in 2004 and have been helped numerous times by the advice posted. This time, I haven't had much luck fixing my problem after reading through the forums multiple times. Here's my issue:
I have about 66,000 miles on my TB. About two weeks ago, I stopped at a light and all the sudden the engine started running really rough. By the time the light changed the SES light was on solid. As I accelerated from the light, the engine continued to run rough until I was up to around 2.5K RPMs and it seemed to smooth out. At that point the SES light went from solid to blinking. When I slowed down again, the engine started running rougher the slower I got and the SES light went back to solid. I also noticed my gas mileage dropped from around 14 to 10.
I jumped on the forum and started reading when I got home. Based on the information I found, I decided to try a bottle of fuel injector cleaner first. I bought a bottle of Gummout and it didn't make a difference. The next step for me was to check for the spark plug wells filling up with water. I took a look at all the coils and found coil #5 had a bunch of white chalky material on it and carbon inside the boot. I went ahead and bought a coil pack from Autozone and replaced the #5 coil/boot (disconnected the negative battery terminal to clear the SES light). This did not make a difference. The rough idle is still there and the SES is back.
On to plan B - I know a guy at work who owns code reader software (Autotap) and the interface plug. I loaded it up on my laptop, plugged it in and it had a P0301 - Cylinder 1 missfire code. I then started up the vehicle and after running a minute it threw out a P0300 - multiple missfire detected code. I then cleared the codes and the P0300 came back. I then used the software to set up specific monitors for each cylinder and found the cylinder two was continually missfiring but not any others. The only exception to that is that if I rev the engine to over 3K RPM, cylinder 5 starts to missfire a little as well (but only when over 3K). The funny thing is, I never get a P0302 code, always P0300 (and the P0301 hasn't come back either)... So with this info, I decided to try the spark plugs and to move the coils around to see if the missfires would move to a different cylinder. I bought AC Delco plugs, put them in and no difference. I then swapped the #2 and #5 (new one) coils and saw no difference either.
I'm not sure what my next step should be... I don't know if the Catylitic converter could be the culprit, or the fuel filter, compression, etc... Any help would be greatly appreciated!
Glen