Question about Chevrolet Silverado 1500

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1998 chevy 350 runs rough backfires some times when starting

180000 miles new distributor wires and plugs

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  • 38 Answers

Timing is too far advanced

Posted on Sep 14, 2014

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Posted on Jan 02, 2017

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dmfixit
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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

  • 1861 Answers

SOURCE: Car starts hard and runs rough in cold weather, undrivable

The correct spark plugs are very important. Glad to hear you got it fixed good.

Posted on Jan 20, 2009

  • 1151 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

  • 11 Answers

SOURCE: 1988 chevy 350 problem

The crank angle sensor maybe bad. It sends a signal to the computer so the spark plugs fire up.

Posted on Sep 09, 2009

  • 474 Answers

SOURCE: 87 chevy 350 fuel injected pickup wont run smoothly

sounds like your egr valve is gummed up or bad. this is located behind the throttle body and has a single vaccum tube connected to it. if the diafram is still good you can remove it and clean it with WD 40 until the plunger works smooth

Posted on Nov 08, 2009

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98 chevy truck 350 engine 93K miles when starting sometimes the engine will backfire..could be cold or hot engine..but after it runs for a couple of minutes will run fine..


A backfire usually indicates a timing issue. I recommend a minor tune up, which will include new plugs and wires, as well as checking/setting the distributor timing. An oil change is also recommended after the issue is corrected, as offset timing can cause fuel to remain in cylinder, which then bleeds past the piston rings and ends up in the crankcase with the engine oil.

Apr 23, 2017 | Cars & Trucks

1 Answer

I have a 1998 Chevy K1500 with a 350 and it runs rough from time to time and has a mis fire on #6


Looks like you covered just about everything outside the engine.
Since it has 225k on the engine, its possible the valves are carboned up or burned to where one of the intake valves fail to close some times.
You might try a compression test or use a vac gauge when it is running rough. If the problem was not happening before you changed the plugs, you could have bought some defective ones.

Jul 25, 2012 | Chevrolet 1500 Cars & Trucks

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We have a 1986 chevy nova 1.6 liter 2bbl carb and we replaced fuel pump, spark plugs, distributor cap, wires, exhaust, fuel filter, oil filter, new oil, air filter, but it is still running rough and we...


no points on that model it uses a spark advance. if its running smooth while your driving it and only rough at a stop believe it or not they put out a bulletin about the motor mounts being bad for this condition

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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

Mar 06, 2009 | 1990 Chevrolet C1500

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