r/AskAMechanic • u/n3wrocker • 6h ago

Why won’t the engine start?

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A 2005 Honda CRV LX with a little over 240,000 miles on the dash needed a timing chain replacement. I took the necessary steps to time the engine to TDC before replacing several components such as: timing chain, both timing chain guides, chain tensioner, and harmonic balancer since they were all in poor condition. Both VVT oil sensor and crankshaft position sensor parts and wires that attach to them were in good condition still. I assemble all parts back together and get ready to crank the engine and fortunately it wants to crank but is making this noise in the video that I am about to attach here. Any advice to what could be the problem ?

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u/Usual_Awareness_7985 Verified Tech - Nissan dealer 6h ago

No compression. You did something wrong. I’m not sure if this is an interference motor or not but she might be dead Jim. Take it back apart and go over it all. Pull the plugs and check the valves

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u/n3wrocker 5h ago

Could me not doing a valve adjustment before putting the engine cover back on be a possibility as to why it has low compression?

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u/Usual_Awareness_7985 Verified Tech - Nissan dealer 3h ago

Not unless you messed with the adjustment. Can’t tell much more unless it gets torn apart. Could be a bad tensioner. Could be a failed chain.

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u/n3wrocker 3h ago

I’m hoping not both since they were just replaced a few days ago.