Question about 2004 Dodge Stratus

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Misfire...Lost 8 MPG

Recently had a misfire and loss of gas milage replaced plugs, wires, oil, airfilter, still having problem maybe a vacum leak but i sprayed ether at the manifold and no idle change and still misfires any ideas

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  • tacochilidog Jul 06, 2008

    yep same thing replaced spark plugs and boots still same thing



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Check timing.

Posted on Jul 05, 2008


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Has misfire codes and idles and runs bad

replace spark plugs, spark plug wires, fuel filter, and add some injector cleaner to the gas. Any change? if not it could be something to do with your ignition system, or fuel injectors, or maybe even engine timing.

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Tuned-How -Spark plugs??

You have a misfire, you say on #3,
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Have you tested the ignition module

Have a scope put on secondary ignition,
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My car keeps shaking and it like wants to stop

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Feb 12, 2011 | 1993 Oldsmobile Cutlass Ciera

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New oil change, new plugs, gas milage is down to 26 mpg, was 31mpg

Are you sure they used the correct oil? If they put a thicker viscosity oil in it then that would explain some of your loss of gas milage. Did they change the air filter. A clogged air filter will also take extra gas.

Dec 07, 2010 | 2000 Toyota RAV4

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I have a 2003 Subaru Baja with 126k. Recently has developed what I thought to be a misfire. When I pulled the spark plugs they were loose and covered with oil. I changed the wires and plugs and still have...

I would replace the filter and verify the fuel pressure. should be 30-40psi but I dontt have the exact spec. The oil in the plug tubes may be caused by leaking valve cover gaskets.

Sep 06, 2010 | 2003 Subaru Legacy

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I have a 2003 Chrysler Voyager mini van and the engine light is on and it's running rough. I'm getting several error codes from the engine light. PO351, PO300, 301, 304, PO442 and PO455.

wow a lot of codes, lets start with them....

P0351 ignition coil A primary/ secondary curcuit

P0300 random misfire detected

P0301 Cylinder 1 misfire detected

P0304 Cylinder 4 misfire detected

P0442 Evaporative emissions leak detected (small)

P0445 Evaporative Emissions System Purge control valve circuit shorted

I guess the first thing i would do, is insure that all the maintenance on this vehicle was up to date. Do an oil change and a tune up. Make sure you use decent spark plugs as a fouled plug or bad oil could cause a misfire. After you do the tune up, try running it some more, if the problem persist, you may end up having to replace the coil.

The evaporate emission leaks. These, especially the the 442 can be either a loose gas cap or a small leak in the vacume system. Insure the cap is tight passed several clicks and listen the the motor as it runs and try to hear any leaks. If you find a leak replace the faulty lines. Also inspect the vacume line for cracks and breaks.

Wish you luck, we are hear if you need more help. Thanks for coming to FixYa!!

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The misfire can be caused by an open injector , injector pulg or circuit, bad spark plug ro wire lost compression as a burnt valve blown gasket ( antifrezze foulingthe sparplugs ) Low compression from overheating over mileage or flooding from injector leaking. Take out the number 4 plug and any other and compare what they look like if they don't look the same swich them and see if the miss moves to the cyclinder that the #4 plug moved to. If it does run good or misses on the new cyclinder change the spart plug with new and then look for loss of coolant or oil on plug wire carrect leak and try again

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1 Answer

2000 dakota 4.7 v-8 codes p0300 p0303 p0304 p0307

well the codes
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p0303 misfire cylinder 3
p0304 misfire cylinder 4
p0307 misfire cylinder 7

can be alot of things check cylinders for compression is what i would do first..

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