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Originally Posted by wiswind
I would guess that your problem is clogged EGR ports in the lower intake manifold. You will need to remove the big black upper intake manifold to get to them. Not a difficult job. With the upper intake manifold removed....you will be able to see 1 small port for each cylinder. It is in the port that is always open. I have pictures at http://community.webshots.com/album/201931518cScpNK from when I cleaned mine.
I got the same P0304 code....and blinking Check engine light. What happens is....the EGR ports start to clog at the Cylinders closest to the EGR valve....with cylinders 1 and 4 being the last open ports. So cylinders 1 and/or 4 get all the EGR gasses......causing the missfire. The tar substance that clogs the ports seems to be just at the port....and not down inside the passage that goes to the EGR valve. I did clean the whole passage.....but found that it was not bad at all. |
I replaced the spark plugs,wires, coil pack,and cleaned the EGR ports out with a vacuum like instructed (4 out of 6 were clogged), replaced the upper intake gaskets, put it all back together and drove it, still ran rough and didn't like to start til the 3rd or 4th try-but not blinking c.e.l. yet. I would like to add after cleaning the EGR ports and testing it I didn't get the misfire code but got P0102 MAF circuit low input and P0402 EGR flow excessive. So we researched some more and found we had an old DPFE aluminum, replaced the DPFE-seemed to be running better than ever since I bought it used a few mo. ago.Then the next day I drove it 20 miles to work ran fine on interstate. After work I got gas & washed it (which always seems to follow with misfiring) and sure enough it was misfiring -went to pull the codes and still got the P0304 misfire detected Cylinder 4, and P0102 MAF or VAF circuit low input??
What else is left? Anymore suggestions?