i am having two issues. the main is a semi rough idle/accel, and coolant leak
What is your question?
the rough idle is from start to warmed up. when accelerating it surges? unless floored. recently it developed a large coolant leak. i cant tell exactly where its coming from be it seems to be from behind the water pumps pulley. the surge has been there since i bought the car. has 243k miles. 3.1 v6 chevy lumina euro. got map and maf codes saying bad compression or bad reading. vague code.
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its probably that big nut connector on manifold running down coolant behind waterpump(known problem)
compression test coolant system with tester.as far as surging could be spark wires + plugs
H20 pump is a 15 minute job on a 3.1... 30 minutes for a diy'er and is the most likely suspect!.. Rough idle can be caused by low coolant, CTS signal is affected.
