1997 Dodge Intrepid engine idle is not sufficient, very low

TMARSHALL

MEMBER
1997 DODGE INTREPID
6 CYL
FWD
AUTOMATIC
193,000 MILES

I replaced the timimg belt and water pump at 191k. I then replaced the plugs and wires shortly thereafter. A few hundred miles later a PO301 code came up mis-fire clyinder number 1. I replaced the ignition coil. A couple of hundred more miles another code came up can't remember which one but I found the Idle air valve not working and replaced it. Fifty miles later another PO301 code. What is going on here? Please help!

1 Reply

ROB2008

MECHANIC
258 POSTS

SOME causes of misfire codes are as follows.
1-bad spark plug, coil, or coil boot (carbon tracking around outside of spark plug, you can see this on the out side of the plug, replace the plug and coil boot if any tacking at all) also check that you have power to the coil, and that the ECU is grounding it.
2-vacuum leak (look for any hoses or possible problems on the intake runner to the cyl. That is misfiring)
3-injector (check that the injector is firing, you can use a stethoscope, if it is not clicking, you will need to check that you have power to the injector and that the ECU is grounding it)

A miss-fire code could also come up if you exhaust leak or a bad O2 sensor(s).