Question about 1985 Chevrolet El Camino

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I bought a 1984 chevy 350 engine from a salvage yard that ran but never ran right. Come to find out it had a bad exhaust valve. we took the head off blew it out and replaced the valve and put the head back on and hooked everything back up. We set the valves and the timing. It wont start at all. It fired a couple of times but never started. We checked timing again with the valve cover off and made sure it was on tdc with distributor pointing at #1 cylinder. We tightened and loosend the rocker arms by half turns and and tried again. It still wont start. We have spark and fuel. Tried turning the distributor every which direction and it still wont do anything. Is there any other ideas to try?

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  • Chevrolet Master
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With the #1 piston at top dead center, it can either be on the compression stroke (both valves closed) or the exhaust stroke (exhaust valve closing, intake valve opening). You have to make sure both valves are closed when you set the distributor for #1. Otherwise your distributor timing will be off 180 degrees.

Posted on Mar 30, 2017

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You never mentioned it so I will, it must be at top dead center of the compression stroke, verified by the fact of both intake and exhaust valves being fully closed, when it fires, and the next time the piston comes back up to TDC the exhaust valve is open to let out the old charge of air out. Remember four stroke engines #1'Intake' fresh air/fuel charge- #2'Compress' air/fuel charge- #3'Fire (Power Stroke)-#4 'Exhaust dirty air.

Posted on Mar 30, 2017

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  • Chevrolet Master
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If you have a weak spark it will not start since under compression it takes a much stronger spark to jump the gap as compared to a spark in normal air pressure. Try a good known working coil.

Posted on Mar 30, 2017

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6ya6ya
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Posted on Jan 02, 2017

hacksawcb
  • 1 Answer

SOURCE: Valve noise

I am from the old school. Start the engine with the valve covers off, back off the rocker nut until the rocker starts tapping then slowly tighten nut until tapping stops then go an 1/8 of a turn tighter. Repeat the same for the rest.I know it will be very messy and you have to watch the oil on the exhaust manifolds for a fire. There will be a lot of smoke. What I do is cut out sheet metal and use it as a shield so the oil does not flow over the head as much.

Posted on Dec 27, 2008

ourhowse
  • 2007 Answers

SOURCE: putting distributor back in the right way

Okay. Turn the engine untill you have the crank mark lined up with the 0 on the pointer. At that point, look at the valves on #1 cylinder. They should both be closed, or in the "up" position. If they aren't, you'll have to turn it one revolution, to get to compression stroke. Now, you're ready to put the distributor in. Take the top off the cap, and position it in the hole, so that the rotor lines up with #1 on the distributor cap. If it's a newer one, take a close look inside at where #1 actually is because the newer ones are off set a little. Now, tighten the cap on, and hook up the plug wires, one at a time in the proper order and rotation. When you try to start it, it should run where it is, but you may have to turn the distributor slightly one direction or the other to make it start. Try your best to keep it running for 20 minutes or so the first time so your gaskets will set. ( not always an easy task when the valves aren't adjusted, and antifreeze can still vapour lock on you) If you need to know more, let me know.

Posted on Nov 13, 2009

Testimonial: "Thank you , but still hoping i had it at tdc to start with when i set the rocker arms but checked comp good on all but #1 and #3 "

jturcotte
  • 8531 Answers

SOURCE: 1988 Full Size Blazer 350

The injectors are powered by the ECM-1 fuse. If the fuse is good, the ECM must be confused about when or how much to fire the injectors. This may be the old problem you had just getting worse. Recommend you try unhooking a few sensors and let the ECM go into limp mode. For, example, you can disconnect the MAP sensor to see if the car will start. Just for grins, see if the truck will start with either down the barrel. This will verify the issue as fuel. Try these things and let me know what you find out.

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Posted on Nov 26, 2010

  • 1252 Answers

SOURCE: 1996 chevy c1500 5.7.

You need to pull the distributor back out, put motor to TDC
now you say its always a tooth off...the timing chain may be alittle worn..so when you are trying to put the distribor back in ...put a socket or something... to move the crankshaft.....move it back and forth untill the distributor falls in....AT the number one plug on cap....
Hope this helps you out ??

Posted on Jul 07, 2011

  • 78 Answers

SOURCE: my 95 s10 blazer w/4.3 vortex wont start again...

it could also be the fuel pressure regulator or fuel filter that is in line or mabey the fuel injection relay i no it will not start if that blows well i hope this help please give a good rating that you

Posted on Jul 08, 2011

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