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Old 02-09-2016, 11:43 PM   #1
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Default Please help me understand this

3800..grand Prix.
Non super charged

Please help me understand these readings. There is of course the dreaded P0300....


The screen shot is at idle. The higher numbered screen shot is running at 2000 rpms.

Thx
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Old 02-10-2016, 11:42 PM   #2
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Since this is a 3800, with only one O2 sensor controlling F/A mixture, all injectors should be commanded the SAME pulse-width.....four of them are way off.....

Do you have misfires on 4 cylinders? Have you looked at misfire data on a scan tool?

Have you taken resistance readings on the injectors? Should be around 12 ohms on a cold engine....
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