2000 grand marqui runs good cold /rough after warms up
Asked by Roy Jul 01, 2014 at 08:45 PM about the 2000 Mercury Grand Marquis LS
Question type: Maintenance & Repair
my car runs rough and acts like its missing it wont do over 30mph or climb a hill,i replaced spark plugs mass air sensor fuel filter and 4 o2 sensors.my car only has 56000 miles on it and im the second owner ,the codes still say running lean bank1 sensor2,bank2 sensor2 this is my only way to get around and I live in bfe......someone plz help
3 Answers
Likely it's the MAF but without watching the actual readings coming from the engine sensors, it's only a guess. There's more to it than just reading codes.
ty tracy like I said it has a new maf I am trying to find someone with a cpu ,its just odd it runs great cold after an hour or so it starts running ruff im also going to check the fuel pressure
This is for Roy does it smell like roten eggs when it is acting up going up hill. If so have your cataletic converter checked I went thru a simular experience with my 00 model as well after replacing all 4 02 sensors it was still running rough I had the rear converters cut off. And piped in place of them. Of course I still get a 02 code sometimes but it made mine run alot better and a little louder. But I have dual Cherrybombs on mine so it sounds better to me it's a matter of if you like to be heard from a distance or not...
