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  #1  
Old 01-03-2011, 01:13 PM
alx alx is offline
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Join Date: Jan 2011
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Default 4.0 backfireing ?

ok i have got my hands on a 94 ranger with a 91 explorer motor in it ...
started out with a code reader got all codes cleared and fixed so it now has no issue's other than at 1200 to 2100 rpms it starts backfireing and has no power put new exhaust on it as well as changed the fuel filter and mass air all good ... but i cant figure out the backfire ?

also i replaced the intake gaskets all of them still have the issue
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  #2  
Old 01-08-2011, 02:03 PM
Botta Ranger Botta Ranger is offline
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Default Re: 4.0 backfireing ?

Backfiring is frequently caused by an intake leak. One troubleshooting technique:
Adjust an acetylene torch so you can just feel it blowing against your cheek. NO OXYGEN and DON'T LIGHT. With the engine running spray the gas around intake, lines, fittings etc. If a leak sucks it in you will notice a change rpm. The leaks were always in the same place on old Harleys and we'd just squirt lighter fluid on the joint and it would suck so much in that it would kill the engine.

Good luck.
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Old 01-08-2011, 02:12 PM
edgeman4.0 edgeman4.0 is offline
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Default Re: 4.0 backfireing ?

^ you can do the same trick with a can of throttle body cleaner and it has the same outcome, when the leak sucks in the cleaner fluid it will "choke" the engine down.
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Old 01-08-2011, 03:03 PM
Chris Chris is offline
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Default Re: 4.0 backfireing ?

A new exhaust? As in the Catalytic converts? First of all O2 sensors can cause this, as well as a stopped up Catalytic converter. Bad plugs can cause this, cracked plugs, maybe a lose spark plug wire. sticking injector. Being no codes are being thrown and that year of the vehicle, I'd lean more towards a cat. exhaust manifold could have a leak as well. I don't know if this vehicle has a TPS on it or not, but those can cause issues with back firing.
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