2004 Montana misfiring

[Mr_Cool59]

i changed the spark plugs last weekend and now it seams to be missing when you are driving it. i believe that i put nkg plug in it.

 

[melsg5]

Is the check engine light on?
Did you check the spark plug gap?
What number plug did you use?
Did you forget to hook something back up, either electrical or vacuum?

 

[Mr_Cool59]

light only flashes never stays on
everything got hookup backup
i gaped the plugs my self
NGK V-Power Nickel - Spark Plug TR55

 

[melsg5]

have the ecm scanned for the code that is causing the light to flash. Autozone and others do it no cost.

______________________________

 

[Mr_Cool59]

sorry for the late replay had a lot of stuff to do this weekend, but i did check for codes and it did not have any codes stored. but it seams to do this when you get up to 40 MPH

 

[melsg5]

the check engine light flashes and you have no codes? Something is wrong with your scanner or you have a blown fuse for the diagnostic port.
It also states for the TR55 "may not meet OE standards"

 

[m0ng0]

My 2003 van did not like NGK plugs, switched to AC plugs and new wires and my p0300 random misfire code went away, just a thought.

 

[crash5456]

Scanners don't always show codes. GM dealer will tell you they don't always show codes

______________________________