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Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1694
Experience:  Auto Technician
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Recently had our timing chain replaced on a 2008 2.4l

Customer Question

recently had our timing chain replaced on a 2008 2.4l Malibu. last night the engine would not start, took it back to shop and they told us there is no oil pressure and the cam shafts are not turning and all the intake vales stuck open. ruined engine. could these be related to the timing chain on this engine. not sure how the oil pump is driven, probably off of the crack shaft?
JA: How old is your oil pump? Has the check engine light come on?
Customer: the oil pump is original with 125000 miles, the engine light had come on and my son kept driving it for a week or so around town
JA: Are you fixing your Malibu yourself? What have you tried so far?
Customer: I have not tried anything yet, might trash the whole car as it is only worth $4500 - $5000. new/rebuilt motor will be to much. thought about trying to get one from salvage yard, don't know yet
JA: Anything else you want the mechanic to know before I connect you?
Customer: not that I can think of
Submitted: 1 year ago.
Category: Chevy
Expert:  Dan replied 1 year ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 1 year ago.

How long ago was the chain done? why was it done?

Customer: replied 1 year ago.
1 month ago, car was running rough, said the timing had slipped
Expert:  Dan replied 1 year ago.

I have seen things like this happen before, after jobs like this if they were not done correctly, something left loose etc. I have also seen old silicone from the timing cover end up in the oil pan which clogs the oil pump pick up screen and starves the engine of oil.

Customer: replied 1 year ago.
the oil pump is not driven by the timing chain, probably on the crank somehow?
Expert:  Dan replied 1 year ago.

You could drop the oil pan and look and see if there is a lot of silicone in the bottom of the pan. The oil pump is driven by the crankshaft, and is not removed when doing the timing chains.

Customer: replied 1 year ago.
Expert:  Dan replied 1 year ago.

The oil pump is in the timing cover. Here is a pic.

Expert:  Dan replied 1 year ago.

The crank spins the center part of the pump here is an exploded view.

Expert:  Dan replied 1 year ago.

Not much you can do now without replacing the engine. I would look on and try to find a used engine in your area.

Expert:  Dan replied 1 year ago.

Please reply to this if you need more help and we can continue this conversation. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. If I am not giving you 5 star service, please let me know what I missed.



Expert:  Dan replied 12 months ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.

I do not get compensated for my time and resources unless you rate me.