Question about 1969 Chevrolet Chevrolet 350 cu

1 Answer

I have a 1998 chevy 350 that is backfiring through carbourator. Tried everything, three different mechs cannot solve. Please help, Regards, Andre

I have the MSD distributor, coil and wires. Edlbroc carb. I have two engines in a 28' boat. Both had the same problem. After going through two complete rebuilds only one engine backfires through carb

Posted by andre zeno on

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1 Answer

ken hane

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  • Chevrolet Master
  • 450 Answers

Just a thought, but , if engines are basically stock in nature, putting high performance electrics into them like MSD distributor was a wrong decision . I would replace them with a more stock distributor setup, my reasons are based on my own experience with my 1988 gmc 350. tryed to get a greater spark, more bang for my buck, it ran , but when my mechanic tryed to perform an emissions test , I had your same problem, even fire exploding out of carburator, he literally blew a gasket @ me, almost burned his arm off. he races cars for a hobby, first thing he said was to put back the stock distributor & coil, I did , success ! in coclusion, you have too much fire (spark) and your timming might need adjusted a bit ! HOPE THIS SHEDS SOME LIGHT !

Posted on Feb 24, 2013

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5 Related Answers

Anonymous

  • 379 Answers

SOURCE: Looking for the torque specs for 1998 chevy astro van?

1998 chevy astro 4.3 v6 torque specs include :
* foot pounds *
balance shaft (if equiped) gear bolt = step 1 = 15 ft.lbs. step2 = additional 35 degrees.
camshaft sprocket bolt = 18 ft. lbs.
connecting rod cap = step 1 = 20 ft. lbs. step 2 = additional 70 degrees.
crankshaft damper bolt = 74 ft. lbs.
crankshaft oil deflectorbolt/nut = 27 ft.lbs.
cylinder head bolts = step 1 = 15 ft. lbs. step 2 = additional 73 degrees. (tighten in sequence)
2811243.jpg


exhaust manifold bolts = step 1 = 11 ft. lbs. step 2 = 22 ft. lbs.
flywheel bolt = 74 ft. lbs.
main bearing cap bolts = step 1 = 15 ft. lbs. step 2 = additional 73 degrees.
oil filter adapter bolt = 15 ft. lbs.
oil pan bolt/nut = 18 ft. lbs.
oil pump bolt = 66 ft. lbs.
rocker arm with press in studs = 18 ft. lbs.
rocker arm with screw in studs = 19 ft. lbs.
valve lifter retainer bolt = 12 ft. lbs.
water pump bolt = 33 ft. lbs.
* inch pounds *
balance shaft retaining plate bolt = 106 in. lbs.
camshaft retainer plate bolt = 106 in. lbs.
front cover bolt = 106 in. lbs.
intake manifold upper = step 1 = 44 in. lbs. step 2 = 88 in. lbs.
intake manifold lower = step 1 = 27 in. lbs. step 2 = 106 in. lbs. step 3 = 133 in. lbs. ** (tighten bolts in sequence)

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thanks for your vote !

Posted on Dec 28, 2008

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Anonymous

  • 226 Answers

SOURCE: timing on a 350 chey engine

take out number 1 spark plug and put your finger as to block the hole ,have a friend bump the starter till you feel air rush out real fast / called the compression stroke when it does stop and look down the top center for timing marks on the pulley and line them up on the timing cover then place the distributor in place as so the rotor is pointing at the #1 piston location, basically the dr. front corner and start there, timing order is 1..8..4..3..6..5..7..2.. now if you get all these in right 1..3..5..7 are on the drivers side front to back and 2..4..6..8 on the passengers bank front to back and the distributor turns clockwise .good luck hope this helps you.

Posted on Jan 02, 2009

Mike258

Justin Case

  • 1498 Answers

SOURCE: how to troubleshoot 1993 chevy Z71 pcm

Hi Nsilguero,

I apologize for the delay in responding.

From your description, I'm leaning toward a timing chain problem, first stretching, then skipping and finally breaking.

If you're getting voltage to the coil and still getting no spark, there is a test I'd like you to try.

Take off the distributor cap and have someone turn the engine over while you eyeball the rotor. Is it spinning?

This going to take some back and forth interaction. Comment me back with the results. We will proceed from there.

Mike

Posted on Jan 17, 2009

Dennis Boxerman

  • 1305 Answers

SOURCE: 1990 chevy 350 distributor wiring diagram and firing order

The firing order is 1-8-4-3-6-5-7-2.
The distributor rotates in a clockwise direction. The engine must be on the compression stroke on the #1 cylinder. Line up the timing marks. Remove the cap and the rotor should be pointing to approximately the 5 o'clock position.

Good Luck

Posted on Mar 06, 2009

Moe

  • 335 Answers

SOURCE: no spark 350 chevy tbi

You need power on both sides of the coil with key on engine off. With test light on neg side of coil you should get flashing light with engine cranking. No flashing indicates no trigger from ign module. No flashing can also mean the pick-up is faulty. To check pick-up dissconnect from module and use analoge meter set on ohms.Check meter movement during crank. If o/k check rotor for burn through.and change module.

Posted on Apr 23, 2009

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