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Would a 4.9 liter engine backfire that's strong enough to rip open the seam on a muffler cause any internal damage to the engine? what to look for???

The 1986 ford f-150 that I own went in for service to replace all the "O2" sensors. $260.00 in sensors later the technician tries to start the vehicle but can't. he pumps the gas pedal and fills the cylinders with gas and when it finally does start the gas in the cylinders ignites and causes a serious backfire that rips open the seam on the 6 month old muffler installed in may 2012, as part of an exhaust replacement from headers to tail pipe when I picked up the truck on January 10, 2013, the service manager said that the $260.00 in sensors and all the labor was free. I started the truck and it sounded like a SHERMIN TANK!!!!! I questioned them about it and they told me exactly what I told you. I tried to drive it to another repair center and it backed fired, wouldn't idle, died everytime I let off the gas. what are some of the internal damages related to this incident

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: Exhaust pipe rattles when car idles. Had muffler

Check the heat shield on the Catalytic Converter, after a few years they start to rust off and rattle. Crawl under the Pathfinder and bang along the Converter and muffler area and see where it's coming from.   Good chances are, it's from the heat shield since you already had everything changed from the Cat back.
Good luck and hope this helps.

Posted on May 11, 2009

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SOURCE: car won't start up

have u got a spark

Posted on Sep 01, 2009

sscullys
  • 984 Answers

SOURCE: I deleted codes (banks 1 & 2 too lean, and

If you cleared the codes with a code scanner, or battery disconnect, all is should take to trigger the problem again is 2 driver cycles.

Drive cycle :
Operating temp engine ( let it warm up )
At least 1/2 tank fuel
A run of normal throttle usage, to maintain at least 46 mph for 5 min, back down to a stop and then back over 46 mph again ( 5 min ).
2 cycles of this should have the DTC P1000 code removed ( tests completed ) and if the error is still there, the CEL should illuminate again.

Posted on Nov 04, 2009

  • 645 Answers

SOURCE: have replaced fuel pump, relay & fuel filter.

have you checked to see if you have a bad came or lifter. that would make it backfire. if it kind of spits fuel it maybe cam. if it throws fire than it could be timing like a bad chain.

Posted on Feb 12, 2010

  • 236 Answers

SOURCE: My jeep dies while driving. It decelerates and

i think the catalytic converter is clogged up, meineke , midas or somewhere of that sort will test it for free where i live, call ahead and check where you live , it only takes them a short time to do this test, and it sounds like you've spent plenty, its a free test, and can very well cause the problem you say you have GOOD LUCK!!!!!

Posted on Jan 16, 2011

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1996 JEEP GRAND CHEROKEE,4.0L,6CYCL.,2WD,ELETRICAL PROBLEMS THAT MAKES MY TRUCK BACKFIRE SO HARD IT BLOWS MY MUFFLER OPEN LIKE A ALUMINUM CAN,SOMETIMES YOU CAN FEEL ELECTRICITY SHOOT TO THE PASSENGER


There are a couple of things that might cause a backfire and NONE of them have any relation to electricity:
1. Engine timing, the relationship of the CAM and the CRANK shaft. IF a valve is open when the engine cylinder fires then the resulting action is a backfire.
2.Cylinder misfire: There is one cylinder exhausting unfired fuel to the exhaust manifold and if he manifold is hot enough, the fuel mixture ignites.

Jan 25, 2016 | Jeep Cars & Trucks

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99 kia sportage, backfiring, no power, rough idle.


yes it is a blown head gasket also probally a broken valve these engines do not like heat do your self a favor and stop driving it your doing more damage to it everytime you start it

Apr 22, 2013 | Kia Sportage Cars & Trucks

1 Answer

Please help me anyone..I have a 92 cadillac deville with a extreme backfiring problem. It has actually plown the muffler apart. We changed the spark plug, fuel filter 2x, distributor system, map senso


I know of 1 problem in the Northstar engine. On some year models there was a sooting problem in the valves and engine heads. The manufacturer recommends an annual application of a chemical GM sells and it is potent. This chemical requires the engine to sit at least 8 hours to overnight for the chemical to dissolve the soot.

This problem can cause the valves to stick and would make the compression leak into the exhaust if an exhaust valve was stuck open. So in some cases unburned compression gases could flow into the hot muffler and cause the problems you mention.

Also worthy of mention is the damage to vacuum solenoids and egr fixtures from the backfires you mention. Other problems like spark plugs and distributor systems would show up on trouble Codes as defective and misfires. But you have replaced most of this to no avail.

This is because the Mechanical action of the valves can be unmonitored to some degree, more like cause versus effect. The onboard computer can show the results of the problem but not the cause.

Some old testing equipment like a Vacuum gauge can show valve action. This gauge is cheap, but a little hard to find today.

You really do not want to have to pull the heads off of this motor. It will cost more than the car is worth because if this is the front wheel drive model, you have to drop the engine and transmission frame and separate the body for this mechanical carriage.

Jun 07, 2012 | 1992 Cadillac DeVille

1 Answer

Ocasional backfire


Yes it could but i dont under stand why it would cost so much usually you can change the muffler for $200 to $300 it sounds like hes trying to rip you off

Dec 09, 2011 | Cars & Trucks

1 Answer

I want more power and i dont have enough money to buy a 2.0l engin


Hello and welcome to FixYa!

Yes that's gonna be a problem. If you want, you can oversize the piston and rings but it will surely cost you. It's the chance you'll have to take. Modification on pistons and liners can cause just a little rather than purchasing a 2 liter engine.

I strongly suggest that you get a 2 liter engine rather than taking chances on modifications. This is for safety and pure performance.

Hope this helps and thank you for using FixYa! Have a good one!

Apr 28, 2011 | Mazda 323 Cars & Trucks

2 Answers

Can my muffler make my car run slower and shake?


CLOGGED FUEL FILTER OR WEAK FUEL PUMP CAUSE CAR TO HAVE LACK OF POWER AND SURGE.CHANGE FUEL FILTER,CLEAN FUEL INJECTORS WITH CAN SEAFOAM BY ADDING TO 3/4 TO FULL TANK OF GAS.CHECK FUEL PRESSURE SHOULD BE 41 - 47 PSI FOR 2.0L OR 3.1L ENGINES AND 9 - 13 PSI 2.2L TBI INJECTION SYSTEM.IF FUEL PRESSURE GOOD CHECK TRANSMISSION FLUID LEVEL.FAULTY TORQUE CONVERTER WILL CAUSE LACK OF POWER AND ENGINE SURGE.A STOPPED UP MUFFLER OR CATALYTIC CONVERTER WILL TAKE SLOW CAR DOWN MAKE IT SPEED UP SLOW DOWN SPEED UP SLOW DOWN.

Mar 05, 2011 | 1992 Chevrolet Cavalier

3 Answers

I have a 97 jeep cherokee that stalls and backfires and it has backfired to the point where it blew open my muffler. It doesn't backfire all the time, just at times...what can it be?


It's not possible to pinpoint, with just online info, what is causing the backfire, but if it blew your muffler open, the engine is definitely dumping raw fuel into the exhaust. Look into what can cause excessive fuel to be dumped into the exhaust and you may find the cause of your problem.

Feb 17, 2011 | 1997 Jeep Grand Cherokee

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

2004 Dodge Ram Backfiring and blowing Muffler


White smoke....Means a Blown Head gasket.. Now its not bad enough to stop the vehicle from running but its bad enough, to blow out white smoke..now sooner or later it will stop completly, but you dont want to warp the cylinder heads too bad, then you will have to replace them also, so you might want to fix this problem as soon as possible...and the muffler keeps going bad, becasue it is filling up with coolant/ or too much water, which it is not designed to do..You also maybe doing damage to your cat. converters also...so be careful....And Goodluck, and keep me posted...

Jan 19, 2010 | 2004 Dodge Ram 2500

1 Answer

96 grande cherokee 6cyl. replaced o2 sensor and code still shows bad sensor so changed out again thinkjhg it was faulty but code still shows bad sensor.Drove for while and back fires to the point were...


Sounds more like an ignition misfire. Sometimes also, an exhaust leak in the pipe above the sensor can add enough air to cause the mixture in the pipe to ignite and cause the same problem. The first "weak point" in the exhaust is the muffler which is why it blows it up. Cutting out the cat will not solve this.

Oct 28, 2009 | 1996 Jeep Grand Cherokee

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