Engine Performance problem
1999 Dodge Stratus 6 cyl Front Wheel Drive Automatic 140k miles
1999 Dodge Stratus 2.5L V6, 140k miles
Timing belt, water pump, cap, rotor, plugs, wires, air filter, PCV all replaced 8,000 miles ago, and has run fine since then - until this.
Car suddenly began very rough idle, with intermittent but significant missing throughout rpm range. Misses less when pulling hard, misses more under light load. Codes for intermittent miss and for missing on cylinder 5.
Problem occurred shortly after refueling. Added 'drygas' (02-safe fuel line antifreeze) and injector cleaner, immediately drove 200 miles to home. Upon arrival, problem not as noticable but still present.
Checked cap, rotor, and all plug wire connections that are accessible without removing intake manifold. All OK. Air filter and PCV OK. Inspected vacuum lines (visually), but see no problems. Changed fuel filter (above fuel tank), also replaced fuel pump since tank was already dropped and mileage is high.
Problem still present. To test for faulty EGR valve, I blocked the EGR tube inlet to intake manifold and reattached tube. No change - still runs rough with EGR tube blocked or open. Added 1 can SeaFoam (02 safe) and refilled gas tank. Drove another 70 miles, still no improvement.
After disconnecting battery to change fuel filter & pump, codes were erased. CEL light came back on this morning as I drove to work. Will read codes on generic OBD2 reader when I get home this evening, but expect to find same - intermittent miss, possibly missing on a specific cylinder.
My internet research shows a TSB for the EGR valve on this engine, and a lot of people with similar complaints of intermittent missing. The specified EGR test procedure seems to rule that out.
Any suggestions (short of throwing lots of parts at the problem) would be appreciated.
EDIT TO ADD: Codes now show random misfire (shows twice), miss in cylinder 4, miss in cylinder 5 (1 code each). I believe they are P0300, P0304, P0305, P0300.
have the same problem?
Monday, August 4th, 2008 AT 12:28 PM