Timing chain broke I think on my 2007 Chevy Cobalt LS Coupe only 96,445 miles when it broke I wasn't driving it it broked when I went to start it to have it taken to a mechanic and I want to know

160

Asked by Micheal Nov 26, 2015 at 01:06 AM about the 2007 Chevrolet Cobalt LS Coupe FWD

Question type: General

Could it have damaged anything
because I already bought the new
chain and water pump I'm praying it
didn't damage anything because I
really need my car for work can
someone please help me with this I
Really appreciate it

29 Answers

168,735

It's a rubber belt and I doubt any damage has taken place. Glad you decided to change the water pump as well...

6 people found this helpful.
128,305

If it is a 2.2 engine it has a chain. It likely jumped time due to a tensioner failure. It is an interference engine so depending on how far the timing jumped, there could be valve damage. This is a fairly common problem.

16 people found this helpful.
Best Answer Mark helpful
160

Even if I wasn't driving the car when the chain broke I still could have damage done to my car? When I tried cranking my car up before the chain broke it crunk up but it made a funny noise and didn't sound right so I immediately cut it off... Gave it a min then tried to start it up again but it wouldn't crank... it only spent over

7 people found this helpful.
970

bob is spot on correct usually that is how the chain tensioner fails on start up due to excessive slack in the chain and no oil pressure on the tensioner, you might be ok only way to tell is put the chain on and run it to see

7 people found this helpful.
160

and it that doesn't work then what a mechanic I know was going to already charge me $600 just to put the new timing chain and water pump on

3 people found this helpful.
970

then you are going to have to replace the bent valves, on ebay they sell a kit for your motor that gives you all the things you need to replace the timing chain and balancer chains for about $90

4 people found this helpful.
160

What's the name of the parts I will need if my valves are bent

2 people found this helpful.
128,305

If valves are bent usually a new, rebuilt or used cylinder head is required, along with head gasket, other gaskets, coolant and labor. It is not a do it yourself job for most people. I would have the timing chain and associated parts replaced and see if it fires up and runs. If it doesn't run or runs poorly a compression test will determine if a valve or valves are bent. A broken timing chain or belt is never a good thing. Usually it costs lots of money. It is another poor design by GM. Timing chains should last the life of an engine. Best of luck with it.

2 people found this helpful.
128,305

Also I would NEVER buy critical engine parts on E-bay. There is no guaranty and no way to verify the quality of the parts. I would buy named brand aftermarket of genuine GM parts only for this engine.

2 people found this helpful.
160

Any idea on how much this is going to cost me

1 people found this helpful.
128,305

No way to tell the cost until repairs are started. Your mechanic should be able to give you some information.

160

He telling me I should buy another motor but he never looked at my car

2 people found this helpful.
13,305

He's probably seen enough of them to know what he's going to find. If it was just turning over with the starter when the chain failed you may be OK, but if it actually started you will most likely have bent valves and possibly damaged pistons. Just taking it apart and diagnosing it can take quite a few hours and then after all that if its not repairable you have to start over. Used engines for that car are plentiful and not very expensive. There is a lot of labor to change them out though so be prepared for a big bill. The car is an '07 and its only an LS so it may not be worth it.

160

How much should a used motor cost me if that is the case

13,305

It all depends on where you're located. I'm in Canada so prices are often a lot different than in the US. When I replaced the engine in my '06 I found one on Kijiiji that the owner had already removed from a car that he had wrecked. I would think and afternoon of research and emailing should get you one for about $400-$500 and maybe a freight bill if you're not able to pick it up yourself. I'm sure auto wreckers have millions of them so do a little negotiating if you go that route.

3 people found this helpful.
160

Ok well the mechanic just came and picked my car up so hopefully I'll know something soon

1 people found this helpful.
13,305

Hope it goes well. Let us know.

2 people found this helpful.
30

I was giving a 2007 Chevrolet Colbart it needs a timing belt. What do I expect , Would this be a major problem for me ?

3 people found this helpful.
13,305

It could be. It’s actually a timing chain. If it failed with the engine running at any sort of speed it will likely have valve and piston damage and will not be worth repairing. Do proper diagnostics first before spending money on this car..

1 people found this helpful.
70

i suggest everyone that is stuck with a cobalt,,just realize they are total pieces of shit, and park them at their nearest chevy dealer,,,toss the keys inside,,and walk away,,,wouldn't that be a great reponse to gm, for selling this shit to us?

7 people found this helpful.
13,305

Thanks for your helpful advice. That's what people come here for.

4 people found this helpful.
100

I have a 2005 cobalt,manual transmission & it has 381,000 miles & I still drive it every day. I change oil & filter every 5k miles. Never changed the timing chain or the clutch. The 2.2 engine is a work horse. That is my personal experience.

9 people found this helpful.
13,305

They are great cars and the GM Ecotec engine is indeed a workhorse. That said, 381,000 miles is truly amazing. You've obviously taken very good care of it. Good for you! Mine's at 165,000 and still runs great although the suspension is getting pretty rattley. I've run it a bit harder than you probably have though.

1 people found this helpful.
100

I only changed the calipers & rotors one time & the brake pads whenever needed. The coil pack & iridium spark plugs were also replaced once. Outside of that no other parts were replaced. Before the Cobalt had a Cavalier with basically the same 2.2L engine & I got 185,000 miles out of it, so I think the GM 2.2L is pretty solid.

1 people found this helpful.
30

To find out if you bent any valves do a compression test if it passes then go ahead with the timing chain replacement if it doesn't valve need to be replaced and see what other things are damaged use a compression tester they have it for about 15.00-60 bucks you can also use a rag or toilet paper to plug up the spark plugs holes and crank it of course the compression test only works if it cranks if it doesn't then you need to do the leak down test more expensive but still doable

2 people found this helpful.
20

It is not a timing belt lol it is a chain on the 2.2 eco tech and it can ruin ur valves and cylinders these engines are notorious for timing chain issues due to the plastic guides!!! If it broke while u where driving at a good rate of speed u are in trouble ! The fix for the Cobalt is can of gas and a match they are junk

2 people found this helpful.
13,305

Hey 2BNHC. The original post was 8 years ago, and the last post was almost a year ago so I'm pretty sure the cars in question were repaired or retired long ago. The purpose for this forum is for people with some knowledge and experience with cars to offer helpful advice to others who are experiencing problems. It is not a place to laugh at people for their lack or knowledge or ridicule their cars. If you have nothing useful to contribute then sit quietly on the sidelines and learn from those of us who do.

9 people found this helpful.

If I have. A bad h02 sensor would my 2006 chevy cobalt crank

13,305

It will both crank and run. The O2 sensor is an emissions component and won't significantly change the way the car runs. If it won't crank or start there is something else wrong.

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