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07-22-2021, 10:09 AM | #1 | |
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GMC Terrain
Hello,
I have a 2012 GMC Terrain 3.0 litre with 230,000 km AWD. Its been running fine, then my wife parked in front of the driveway. I rolled it back (in neutral without starting the engine) just past the driveway. The next day it refused to start and still will not start. I had a mechanic come out and do a diagnosis. He said it had power, spark, fuel pressure, fuses were good but compression was low ( he checked the front bank of cylinders .. 90-60-90 psi). He didn't do anything else. The starter is turning, engine just won't fire. Is the low compression the reason it doesn't start, as he said? Am I looking at engine replacement or a valve and head repair/replacement? Thanks |
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07-22-2021, 01:19 PM | #2 | |
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Re: GMC Terrain
I'm wondering if when you rolled it backwards you didn't cause the timing to get slack and jump time. Would explain the poor compression and no start.
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CadillacCoupeMan (07-26-2021)
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07-26-2021, 01:11 PM | #3 | |
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Re: GMC Terrain
Thanks Stealthee,
I don't know much about timing chains, aside from their function. If the chain did jump, can it be reset or do you think the valves got bent as a result of improper timing? Bearing in mind that it never fired while I was cranking it. |
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07-26-2021, 03:37 PM | #4 | |
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Re: GMC Terrain
Just cranking with timing being wrong can cause bent valves on an interference engine if it is off enough.
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CadillacCoupeMan (07-29-2021)
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08-06-2021, 11:59 AM | #5 | |
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Re: GMC Terrain
Thank you Stealthee
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Tags |
3.0 , compression , gmc , hill , terrain |
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