1997 Dodge Caravan question

Tiny
PEEPS1
  • MEMBER
  • 1997 DODGE CARAVAN
1997 Dodge Caravan

I gave $20.00 towards a response to my problem and all I got was a question wheather I checked the conections to the Injectors.I think my problem goes a little deeper than that and expected a better response to my problem than that! What do you think?
Thanks,
Peeps1
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Friday, May 15th, 2009 AT 2:21 PM

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Tiny
RASMATAZ
  • MEMBER
P0304 Misfire at cyl no. 4- should lead you to check the sparkplug/compression/ injector for that cylinder

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

The motor idles rough and the gas mileage has dropped. The next thing I did was to remove all the injectors and blew out the fuel lines. I replaced all the injector gaskets and the intake cap gasket. All still the same. Rough idle

Rough idle:

A large vacuum leak can lean the air/fuel mixture out to such an extent that an engine will not idle at all. An EGR valve that is stuck open at idle can have the same effect as a vacuum leak. So too can a loose positive crankcase ventilation (PCV) hose, a leaky PCV valve or the wrong PCV valve (one that flows too much air for the application). If somebody replaced the PCV valve recently, they may have installed the wrong PCV valve. The rough idle in all of these cases is caused by "lean misfire." The fuel mixture is too lean to ignite reliably so it often misfires and fails to ignite at all. Lean misfire will show up as elevated hydrocarbon (HC) readings in the exhaust, which may be enough to cause a vehicle to fail an emissions test.
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Friday, May 15th, 2009 AT 6:10 PM

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