Question about 1999 Chevrolet Cavalier

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I have a 2003 chevy 7500 truck that runs on propane that backfires through the intake and takes out the boot

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Posted on Jan 02, 2017

  • 3640 Answers

SOURCE: 1999 chevy cav 2.2 backfiring thur intake

here are a few things to check, egr system not working properly, vacuum leak at intake or manifold, damaged valve springs or sticking valves. all of the above will cause a backfire in intake.

Posted on Jan 12, 2010

ftw1952
  • 10319 Answers

SOURCE: 90 chevy k2500 5.7 intermittent backfire into

It may be a sticky lifter if intermitent
did you check all cdes?
the map sensor can do this as well

Posted on Feb 27, 2010

  • 1 Answer

SOURCE: 2003 chevy truck 6.0 liter gas. knock senser bad

2003 6.0 2wd When I put in reverse dash goes dark and gauges dont work for like several minutes? Any one have a clue?

Posted on Jul 20, 2010

skychief2001
  • 21873 Answers

SOURCE: 2000 chevy truck k2500 running rough, no power and backfires. after replacing distrubutor assembly

Is the check engine light on, and have you checked base fuel pressure with a gauge ?

Posted on Jun 04, 2013

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Fuel pump relay on gmc 7500 2003 with gas engine?


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How to manually jump a fuel pump from the fuse box ... Is this the same on the 2003 cavalier chevy? ... I go through fuel pumprelays often on my 99 GMC Yukon Denali. ... Finally, fuel pressure totally drains after motor turns off. ... run right, it would sputter when you hit the gas and finally just would not start.Missing: 7500

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Chevy ventures backfires runs rough


U need to have the timing checked to be sure it is not the problem.

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I have a 91rs automaic and when i drive it some times it backfirers why


Most of the time when an engine backfires it is due to the timing being off or there is a severe vacuum leak at the intake manifold. You can locate the leak (vacuum) by taking a propane torch (DO NOT LIGHT!!) Open torch valve (1/4 turn) And slowly take torch around intake manifold. Wherever torch is and causes increase in R P M's There is where your leak is. Hope this helps

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1993 Chevy Silverado PU 1500, backfire, sputter, die


they might have not put the proper gap on the plugs..and might have over filled the engine with too much oil..

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90 chevy k2500 5.7 intermittent backfire into


It may be a sticky lifter if intermitent
did you check all cdes?
the map sensor can do this as well

Feb 27, 2010 | 1990 Chevrolet K2500

1 Answer

1999 chevy cav 2.2 backfiring thur intake


here are a few things to check, egr system not working properly, vacuum leak at intake or manifold, damaged valve springs or sticking valves. all of the above will cause a backfire in intake.

Jan 12, 2010 | 1999 Chevrolet Cavalier

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

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2003 chevy silverado codes


Most likely cause is the intake manifold gasket

Feb 03, 2009 | 2003 Chevrolet Silverado 1500

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