Question about 1986 Isuzu I-Mark

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I mark engine compression loss

Runs but has a loud compression loss through the intake

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I had the same problem with mine and it ended up being a burnt valve

Posted on Apr 28, 2013

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Boy, it sure seems a lot of work to capitalize every word...

It is an odd answer, but I think one or more of your intake valve are not sealing. Engines make a horrific amount of noise if you pull one spark plug, then start it with the other plugs still in.

There just is nothing in the intake system that can make noise, except what is on the other side of the intake valves.

Do a compression check. If the intake valves are having a sealing problem, the compression will be low.

If the cam that opens the intake valves is late, you could get a short backward flow just before the valve shuts, which could make some noise.

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I have just rebuilt the engine on my 95 isuzu rodeo and when i set the timing marks according to facotry specs it will not start and sounds like the valves are open when the pistons reach the top of the...


You said you did to specs but if that was the case the valves would not be open at tdc.
triple check your timing(get a light if nessisary)
check that you dont have the plug wires mixed up
Note:
Izuzu engines are very picky and if the marks are not correct after turning over two rotations as stated in the book it will not run.
(im also taking that this is the v6SOHC engine)

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