nick levingston Posted on Dec 09, 2013

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Backfires exhaust I just replaced my spark plugs wires fuel filter and fuel pump why is my car still back firing out the exhaust

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Jerome Minks

Mercury Master 3,103 Answers
Posted on Dec 09, 2013

Jerome Minks

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Joined: Jan 13, 2013

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Either out of time or valves are sticking..you can adjust both a little bit..

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Marvin

85242 Answers
Posted on Dec 02, 2008

SOURCE: wiring the fuel pump

THIS 1994 Mercury Grand Marquis Fuel Pump Wiring Diagram Mercury Marquis Fuel Pump IS A 94, BUT IT IS THE SAME FOR BOTH YEARS.

Mike Butler

6674 Answers
Posted on Jan 09, 2009

SOURCE: REPLACING THE FUEL PUMP ON A 1998 MECURY GRAND MARQUIS

So you have power there, why not try a little whap with rubber hammer near it while key on to see if it will do anything. I;d try it just to see if it will come back to life.

Anonymous

1 Answer
Posted on Mar 19, 2009

SOURCE: 1998 Mercury Grand Marquis Fuel Pump Replacement

you can try just resetting the fuel pump switch located in the car

the switch is originally in the car for in case of an accident, however, if changed, chances are you also have to reset it

in my 98 grand marquis, the switch is on the left side of the trunk

Anonymous

6784 Answers
Posted on Mar 19, 2009

SOURCE: Hesitation and Rough Idle

Hi, you stated that the original fuel pump is still installed. I would replace this pump as soon as possible. this may be the key issue. You can check the voltage on this part by using a voltage meter. you should get 14 volts here. if its less than 14, it will run weak , in return, preventing proper fuel flow. I would also check the injection system to see if its running properly as well.

please rate and god bless.

Anonymous

4803 Answers
Posted on Oct 11, 2009

SOURCE: I have a 93 mercury topaz 4cyl 2.3L that stalls

It sounds to me like you replaced everything but the most likely cause of a stall while driving...The crank sensor.

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Backfiring in internal combustion engines occur outside of the combustion chamber, and are typically the result of an improper air to fuel ratio. This can be caused by a vacuum leak, Idle air control valve, throttle position sensor, oxygen sensor, or just about any part of your emissions contorl system.

Backfires may also occur before the combustion chamber. One possible cause of this is igniton timing. If the timing is too advanced, the spark plug fires before the intake valves close, causing the combustion to propagate into the intake manifold, further igniting the air-fuel mixture there; the resulting explosion then travels out of the carburetor or intake and air filter. Alternatively, the engine timing may be retarded, in which case the combustion is not completed by the time the exhaust valves open, allowing the combustion to propagate into the exhaust system.

Improper wiring of the ignition can also lead to timing issues and backfires, or faulty coil or igniton modules.

Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio with fuel injection systems.

Missing or damaged catalytic converters can result in backfires out the tailpipe, but very uncommon, and usually only applies to engines set up for race applications.

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Dec 09, 2013 • Cars & Trucks

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1answer

2003 Dodge Caravan 3.3 backfires

Do you have exhaust leaks before the exhaust converter?

Do you have a blocked exhaust converter?

Did you test the upstream O2 Sensors?

Did you check fuel pressure at the motor?

Are the wires on correctly?

Is the EGR Valve stuck open

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Dec 05, 2012 • 2001 Dodge Grand Caravan

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Have code p0300 active just replaced fuel pump, all spark plugs, wires, cap, and rotor, engine back fires, and has explosion in the air filter area

Code p0300 is multi- misfires [ any number of the cyinders ]. Sometimes when a fuel pump is replaced, the system will have air inside and will mis & backfire untill the air is cleared back thru the return line, or blead out the test port. This will set the p0300 code. It's rare to have a backfire bad enough to have an explosion, bleed the lines thru the test port untill you see no more bubbles comming out.

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Jun 28, 2011 • 2003 Chevrolet Silverado 1500

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3answers

Replaced fuel pump. module/coil, new fuel filter, getting spark, but back fires through engine exchaust. firing order of plugs correct, But after priming engine throttle with ether, car only back fires and...

Try a compression test, as it sounds like your car has jumped timing. (Belt or timing chain)

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Aug 11, 2010 • Buick LeSabre Cars & Trucks

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2answers

Ford F150 engine backfiring, running/idling rough

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

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Apr 16, 2010 • Ford F-150 Cars & Trucks

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1answer

I changed spark plugs ,wire ,disturbator cap fuel filter, air flt

Platinum plugs are good, but you may have to replace the one that is back firing. It sounds like you may have the the firing order mixed up causing detonation. Two or more if your spark plugs may be firing at the exhaust stroke, rather then the compression stroke. The firing order is 1-2-3-4-5-6 and on the passenger side you have 1-3-5 ( 1 ) being towards the radiator and on the drivers side 2-4-6 ( 2 ) being towards the radiator. The distributor cap should be labeled on the inside as to the #1 spark plug wire. The cap rotates counter clock wise and the #1 should be the drivers side towards the radiator. Good luck and hope this helps. Keep me posted, be glad to help.

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Jun 22, 2009 • 1998 Nissan Pathfinder

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Backfires exhaust I just replaced my spark plugs wires fuel filter and fuel pump why is my car still back firing out the exhaust

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Jerome Minks

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