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#31
07-01-2017, 10:16 PM
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Re: 1998 Silhouette No Start Condition - Odd Symptoms...
Broken camshaft is my thought-- if valve springs are not moving- seen it on 3.1L acting the same way as yours...
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles- 
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| The Following User Says Thank You to brcidd For This Useful Post: | ||
Mark R. (07-02-2017)
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#32
07-01-2017, 10:57 PM
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Re: 1998 Silhouette No Start Condition - Odd Symptoms...
Beat me to it - Snapped (hollow) cam or lost chain.
It' s also possible the rocker studs have pulled on those valves, but that would be highly coincidental. Pulling the front rocker cover would reveal that quickly.
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Mark R. (07-02-2017)
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#33
07-02-2017, 12:06 AM
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Re: 1998 Silhouette No Start Condition - Odd Symptoms...
I was thinking ----> broken timing chain.
Wouldn't a broken camshaft make a bunch of racket (clatter noise) when cranking? I was thinking what's left of the timing chain is probably just laying down in the oil pan. Is there any easy way to confirm either of these (without tearing into the engine)..? .
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#34
07-02-2017, 08:18 AM
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Re: 1998 Silhouette No Start Condition - Odd Symptoms...
Yes, you can remove the rocker cover and observe the valves. If only the first few move, the chain is connected and the cam may be snapped. If none of them move, I'd expect the chain drive.
The tubular cam can break at any point, and not necessarily make any noise. The cam will simply be retained in its journals and not move. https://www.youtube.com/watch?v=3kH0Ttgl1lo
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