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Message: <blockquote data-quote="JMF97" data-source="post: 21061" data-attributes="member: 11633"><p>Hey guys, I apologize in advance this is going to be a bit long. I’ve been working on my brothers 2000 4.3 Sierra. It’s had way less power than it should since he’s owned it. It’s gotten to where it will not start when it was cold, he wanted to replace the timing chain and sprockets to make sure that it hadn’t slipped timing or anything, so I did that last week, dropped the pan replaced the oil pump, timing set, new timing cover all of that. When I set it to TDC compression stroke, the arrows on the timing gears were both facing straight up towards the top of the engine, I thought they were supposed to point at each other, bt I don’t know a lot about it and since they were perfectly aligned, I put it back together. It started and ran just like it always did for a day or two and then it just would not start at all, in researching I realized the timing had been wrong, so we pulled it back in the shop and I did the whole job again, I put it on TDC, had the cam gear dot and the balance shaft dot pointing at each other, and then the timing chain gears arrows pointing at eachother, and the distributor pointing at the the little arrow like it’s supposed to and still no start, and still hear compression through the intake tube like it’s out of time. I’m thinking I need to pull the valve covers and check for a broken valve spring or stuck valve or something but I’m curious what you all think since I’m no expert on this stuff, sorry for the long post and thanks in advance - Jordan</p></blockquote><p></p>