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I have an exhaust leak coming from my manifold, it is back firing with blue flames, What is this problem?

It runs good, but when going to adjust the idle on the carberator, we noticed a blue flame popping in and out when the truck would backfire. What is causing this? Can it be fixed?

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  • Anonymous Dec 03, 2012

    Obviously you should have repaired the exhaust leak before asking the question also

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1 Answer

Flames out the carb--- is an ignition timing problem

Bad timing chain or gears,distributor in wrong,wires on wrong

Posted on Dec 03, 2012

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1 Answer

It's dumping gas into the manifold and detonation in exhaust manifold during exhaust firing cycle


Hi Mark:
My train of thought is along the line that for unburned fuel to get into the exhaust manifold, it still has to go through a cylinder so there is either no spark to light it up, or it's so rich that it's not burning. Have you had a chance to check the plug tips for indicators as to what's happening in the combustion chamber?
Just an Old Dude thinking out loud and typing it down...

Jul 28, 2015 | Cars & Trucks

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Carburetor backfire and antifreeze leaking under the car


first up check that you have put the spark plug leads on the correct plugs in the firing order as back firing comes from having 2 leads crossed. Have a pressure test done on the coolant system to find the leak . If it just started after the back firing I suspect that the inlet manifold may be corroded at the water cross over section and the back firing may have loosened the gasket enough for the leak to mstart

Dec 01, 2013 | Chevrolet Cars & Trucks

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Rough idle and blue smoke


Possible vacuum leak and or internal engine issue, have a cyl compression check done along with cyl leakage test

Nov 03, 2012 | Cars & Trucks

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How do you check if you spark plug is firing


Take out the spark plug, place wire back on plug. Hold wire/plug by wire's boot, so firing end of plug is close to (1/4" away from) a ground like the engine block, exhaust manifold, etc.

Have some one turn the key so engine turns over.

If you have good spark you will have a bright blue spark from plug to exhaust manifold. you better use well insulated pliars to hold plug or a piece of wood to hold it to a ground to see if it sparks. good-day !

Mar 27, 2012 | Cars & Trucks

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No power backfires,engine code PO134,replaced 02 sensors,map sensor,idle air sensor,throttle position sensor,took to chrysler,paid 150.00 to check,they said they need more time & money.Is a 2000 ULEV...


p0134 is the upstream 02 sensor staying center and will cause a drivability problem. you don't need to replace both of them, the one at fault is the upstream one, mounted on the exhaust manifold.I do it under the vehicle while on a lift, if you can see it from behind the engine and access it, just remove it. spray it down with some penetrating liquid before attempting to remove it

Oct 20, 2011 | 2000 Plymouth Neon

1 Answer

Rough idle and blue smoke. change exhaust manifold because it was cracks know its missing and sputtering when i put in gear. changed egr valve before manifold.


blue smoke indicates either a bad transmission modulator valve,or a manifold leak{intake} i usually do this test for a bad or suspected bad intake manifold leak,light a cigarette and take it around the intake manifold and look for it to glow really bright for an intake leak,for an exhaust leak you can see it blow the embers away from it.just make sure there's no gas around to ignite.always make sure that a fire ext.is onsite! thank you for choosing fixya.com!

Jun 09, 2011 | 1997 Nissan Pickup

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I have an exhaust leak in my 98 ford ranger 3.0 auto long bed that I can not seems to solve. I have replaced the exhaust manifold gaskets, egr tube, and the muffler which all were leaking. I have taken...


Have a smoke machine used on the exhaust system

If your not familiar with one,they were designed for finding EVAP Leaks,and can be used for lots of things.

A muffer shop with no smoke. That is Fired Flintstone Repair

Oct 07, 2010 | 2008 Ford Ranger 2WD

1 Answer

What causes our 1986 chevy motorhome to back fire through the carburator? This occurs when you first take off, it stops after awhile when warmed up. Carburator has been rebuilt, new plugs, wires and cap....


Backfire in an automobile engine typically results from various malfunctions related to the air fuel ratio. Backfiring can occur in carburetor engines that are running lean where the air-fuel mixture has insufficient fuel and whenever the timing is too advanced. As the engine runs leaner or if there is less time for the fuel to burn in the combustion chamber, there is a tendency for incomplete combustion. The condition that causes this is a misfire. The result of a misfire or incomplete combustion is that unburned fuel or flammable hydrocarbons are delivered to the exhaust manifold where it may ignite unpredictably.


When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner. A common air filter will allow the gases to escape, but will block the flame front. On many small marine engines, no air filter is used, but a screen is placed over the intake of the carburetor as a flame arrest to prevent these flames from escaping the intake, and potentially igniting fuel, or fuel vapors in the enclosed sump or bilge of the boat and causing a fire or explosion. Improperly adjusted carburetors that create a lean condition during acceleration can cause the air fuel mixture to burn so slowly, that combustion is still taking place during the exhaust stroke, and even when the intake valve opens. The flame front can then travel up the intake and cause a backfire. In this situation it is conceivable that there is a backfire occurring in the intake manifold and exhaust manifold simultaneously.

Good luck and hope this helps, check the carburetor settings to make sure it's not running too lean and the timing . Keep me posted, be glad to help you get your RV running 100% again.

Jul 14, 2009 | 1995 Chevrolet C/K 3500

1 Answer

There is smoke coming from a crack in the exhaust manifold


Hi

Most unusual for the exhaust manifold to crack, normally any leaks are usually due to faulty manifold gaskets, or the down pipe sealing ring.

I am sure if you lubricate the fixing nuts well, before removal of the manifold, this is what you will find.

Good Luck !

Give me feed back if you like.

A FixYa rating would be Nice...Thanks...John.

Feb 16, 2009 | 1988 Jaguar XJ6

1 Answer

1984 ford f150 running erratic.


Check and adjust your choke accordingly, also since you have given it a tune up you should adjust your timing if it needs adjustment. Also check for any vacuum leaks. As for the exhaust leak I would look along the exhaust manifold and then along the exhaust pipe under the cab, check where the exhaust manifold and the exhaust pipe connect as there should be a donut or flange in there and it could be deteriorating. Good luck and remember to rate all the solutions you get, thanx.

Oct 31, 2008 | 1984 Ford F 150

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