Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry your having this problem
it was fine for 25 miles and then just the intake lifter is unlocked at idle or when cranking it over ? and the cam shaft lobes where fine ?
are there any codes set in the computer ?
ok that is running at idle correct ?
if so and the lifter is brand new then this issue will be a defective lifter OR the solenoid or DOD assembly being bad or even one of the DOD seals leaking
the DOD system is NOT supposed to come into play at idle or very slow speeds when this happens at the slower speeds its usually one of what i said causing this issue and if it boils down to the DOD system then either replace the DOD assembly complete all one piece OR they do sell a kit to eliminate the DOD system with regular lifters
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yes but if the seal is bad or the solenoid it can just unlock one lifter
i personally am leaning towards a defective lifter that unlocked and physically can not lock back
ok if it did not move that would leave the lifter being defective
if the cam lobe is perfectly fine then the lifter is defective
Hi there, I am Cam.I have a question. How did you change the solenoids over? The valve lifter manifold assembly is exactly that, an assembly.As for parts, what source did you get the parts from? Were there any signs of debris in the system?
Ok so that likely means the lifter needs to be replaced again. The solenoids are not controlling each lifter, rather each cylinder so if its turned off #1, then oil flows to that portion of the block which triggers the #1 lifters (both at once). For only the intake to be triggered means its internal fault in the lifter. Not using AC Delco lifters may mean that the updated design is not being used by aftermarket suppliers and having evidence of debris in the system is concerning. I would be changing out the filter for the oil manifold assembly at the same time. But the bot***** *****ne here is the lifter in #1 is faulty again and needs to be changed.