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What would cause it to backfire if timing is correct

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Unburnt fuel getting into the exhaust system and detonating could be a faulty spark system on one or more cylinders to unbalanced fuel delivery system

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Firing order is out by 2 plugs if v8
incorrect valve clearance or burnt valve

Posted on Dec 28, 2016

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1 Answer

What causes my 1965 4 speed mustang to backfire and sometimes stall?


backfiring is ignition of the fuel mixture while an inlet valve is still open. Check firing order as there may be a HT lead crossed . If it backfires then the mixture is burnt in the inlet manifold so there is nothing left for the cylinders so it will stall. If you are running holley carby then check the power valve for a hole in the diaphram Check for vacuum leaks. check ignition timing is correct and not too far advanced. if the HT leads are touching each other this will induce a spark in the wrong cylinder --use lead spacers from an auto spares shop

Dec 25, 2014 | 1965 Ford Mustang

1 Answer

Honda ctx200 fresh rebuild ran a couple times but started stalling backfiring when warmes up. took cover off found cam out by one tooth. adjusted and out together now it wont start at all. help please


Is it a dual cam engine? If so make sure can gear marks are aligned. Verify distributor is installed correctly set firing order is correct.only two things cause backfiring. Incorrect timing or incorrect plug wire position at distributor cap

Nov 19, 2014 | Cars & Trucks

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Camshaft timing causes backfiring into valves


What was the problem with the car that camshaft timing was changed.a bit off history of car and will try give some advice

Apr 03, 2014 | 2001 Audi A4

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4 brl rochester carb


Backfiring is caused by either the firing order being incorrect or the engine timing is incorrect. generally backfiring through the carburetor is caused by incorrect firing order. confirm the distributor is inserted properly and double check firing order beginning with cylinder number 1.

Mar 22, 2014 | 1984 Buick Regal

1 Answer

Runs good cold,runs bad when it warms up


misfire is bad timing
check cam time.
check spark timing.
bad timing causes backfiring..

did you put the spark wires back like you found them or better the correct firing order? if not it backfires.
last is lean backfire.

Jan 07, 2014 | 1995 Toyota Camry

1 Answer

What cause a 1996 Acura slx truck to backfire


Any vehicle that backfires is not getting the correct ratio of air to fuel. your ignition timing could be incorrect, or could be running rich with fuel

Feb 01, 2012 | 1996 Acura SLX

2 Answers

Engine wont start it backfires through the carb


Make sure the timing is correct. Backfiring is often caused by an engine out of time.
Good idea on the carb rebuild. It may be letting too much gas in.

Jan 15, 2012 | Cars & Trucks

1 Answer

Fuel going to carb, fuel pump working, no prob with fuel filter, enginge cranks over, but backfireing, enginge doesnt start. Have put starter fluid in carb, makes worse. i beliveve i have fire on points,...


I believe this is a fuel injected engine, not a carburetor engine.

Having said that, given what you've already checked and believe to be OK, I'd take a look at timing if I were you.

Could be a timing chain has either loosened or broken, allowing camshaft to get out of time relative to crankshaft. This could cause the backfire you describe.

However, before you go that far....after putting in the new plugs are you positive you got the spark plug wires correctly located ? Crossed wires could also cause a backfire.

Good luck!

Feb 02, 2011 | 1997 GMC Sierra

1 Answer

WHAT WOULD THE PROBLEM BE IF YOUR CAR IS BACKFIRING AND MISSING?


Back fire can be caused by different faults.First is to much fuel because of worn carburetter, or wrong adjusments on carburetter. choke sticking will cause backfire. timing be out of adjustment will cause backfire exhaust leak can cause backfire. bad spark plugs, or plug leads , distributer cap worn of cracked will cause backfire as for fuel in muffler, if it combusted in muffler , the muffler would split open it is not that.

Jul 30, 2010 | 1994 Ford Mustang

1 Answer

Check engine light shows misfires in two cylinders and backfires.


Yes it could. make sure to use the correct champion plugs as well. Make sure your firing order is correct as the intake shouldn't cause a back fire. 1-8-4-3-6-5-7-2.

Jun 29, 2009 | 1999 Dodge Durango

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