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Go Back   Fun In B.C. > All about your Ride > Chevy ramblings

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  #1  
Old 07-26-2012, 04:22 PM
godtool godtool is offline
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1986 350 no start :( pls help

Ok timing chain went I was told. Then they put new sprockets and new chain on. After 350 would not start and even with rebuilt dist and worked by mechanic for 3 hours still no start. So buddy pd mechanic for rebuilt dist. So today I took timing chain off and it appears dots on gears line up. My next thing to do is comp test since was told valves may gotten bent. Previous mechanic found 3 cyl to be about 100 psi yet would not check other 5 until he got paid for rebuilding dist and timing it and everything. So engine pops and farts and even with dist in right spot and not 180 out is just pops and farts. Any ideas other than doing comp test? I expect camshaft sprocket can only go on in one place since it has a dowel to line it up or are there other holes for dowel? I was thinking of taking camshaft sprocket off to see...
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Old 07-26-2012, 04:44 PM
yoda604 yoda604 is offline
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sounds like the chain is out 1 tooth. The dots may line up but make sure there is only slack on the tensioner side, not on the other side, otherwise the cam and crank will be out 1 tooth
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  #3  
Old 07-26-2012, 04:52 PM
abec abec is offline
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Pull the valve covers and crank the motor and see if all the lifters are moveing
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  #4  
Old 07-26-2012, 09:29 PM
85chevy 85chevy is offline
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Crank the engine over with a bar till you see Cylinder 6 exhaust valve close and intake is about to open that is exactly when #1 should fire. Both 1 and 6 should be at TDC but only number 1 is firing.
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  #5  
Old 07-27-2012, 09:36 AM
godtool godtool is offline
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Thanks for pointers. Ill take pic of sprockets and chain today.
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  #6  
Old 07-27-2012, 07:01 PM
godtool godtool is offline
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Looks like marks line up perfectly yet how do you know which valves are exhaust or intake? I took valve covers off and guessed exhaust valves would line up with exhaust manifolds. Could a vacuum leak such as under carb cause it not to start and only pop or fart?
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File Type: jpg timing gears.jpg (33.5 KB, 121 views)
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Last edited by godtool : 07-27-2012 at 07:15 PM.
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  #7  
Old 07-27-2012, 07:12 PM
85chevy 85chevy is offline
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From the front It goes Exhaust, Intake, Intake, Exhaust, Exhaust, Intake, Intake, Exhaust
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  #8  
Old 07-27-2012, 07:16 PM
godtool godtool is offline
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Thanks! Just loaded a pic of timing gears...
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Old 07-27-2012, 07:20 PM
85chevy 85chevy is offline
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U actually got firing order right on the cap and starting in the right spot?
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  #10  
Old 07-28-2012, 01:11 PM
Tsunami Tsunami is offline
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If the truck was running and then started doing this if you have the valve covers off check your lifters mine did a similiar thing last year and it had a lifter come apart don't like telling you the next part but it did a lot of internal damage hope you have better luck than i did just a quick check Good luck
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  #11  
Old 07-28-2012, 11:24 PM
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Umm got gas? But seriously, popping/backfiring can be caused by too lean (no fuel) or retarded timing. Look down the carb while pumping the throttle (while NOT cranking the engine). Should see good shots of gas shoot from the accelerator pump ports.
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Old 07-28-2012, 11:48 PM
ray ray is offline
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just a stupid question is distrubutor out 180 deg ?
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Old 07-29-2012, 08:49 PM
godtool godtool is offline
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Already checked dist and the 180 thing weeks ago. Normally an engine will run a bit when you put gas down carb and we did this a while back but starting tommorow I'll recheck everything... Compression test (dry) averaged 100 psi per cylinder however some as low as 80 and one at 75.
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Old 07-29-2012, 08:55 PM
godtool godtool is offline
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side of chain that should be under tension is right side (drivers side)? crank turns clockwise...
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  #15  
Old 07-29-2012, 09:12 PM
85chevy 85chevy is offline
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Was it running before and you did some work to it and now it won't start?
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