itspalm Posted April 5 Share Posted April 5 Car has been running rich for around the past month, I've replaced the 02 sensors and made sure they're on snug, new MAF sensor, new TPS, New Injectors, New Fuel Pump, New spark plugs, new coil packs but it's still running rich. I've tried unplugging the battery overnight to try and reset the ecu but nothing is working. Does anyone have any suggestions on anything I should look at or attempt in order to fix this issue? My long term fuel% trim is at -40% for both bank 1 and bank 2. Quote Link to comment Share on other sites More sharing options...
Dean2 Posted April 5 Share Posted April 5 Check for an intake manifold leak. If you have a leak, additional air is being pulled into the engine and the ECU will add fuel to balance it out. Causes really poor gas mileage and what appears to be a run rich scenario. Quote Link to comment Share on other sites More sharing options...
itspalm Posted April 5 Author Share Posted April 5 7 hours ago, Dean2 said: Check for an intake manifold leak. If you have a leak, additional air is being pulled into the engine and the ECU will add fuel to balance it out. Causes really poor gas mileage and what appears to be a run rich scenario. How would you recommend i check for this? Quote Link to comment Share on other sites More sharing options...
Dean2 Posted April 5 Share Posted April 5 With car warm and idling spray flammable throttle body cleaner around the intake manifold gasket. If it is sucking air you should be able to hear a difference in the idle rpm. Also, if you have a live OBD reader you should be able to read the vacum level. Also, you can use an old style vacum gauge, it should read 18 or more, if you have a vacum leak it will read a lot lower. Quote Link to comment Share on other sites More sharing options...
itspalm Posted April 5 Author Share Posted April 5 I recently replaced the intake manifold gasket so I really doubt its a leak, I will check but incase it isn't do you have any other suggestions? Also is this something that i could potentially get tuned and fixed that way? Quote Link to comment Share on other sites More sharing options...
Dean2 Posted April 5 Share Posted April 5 If you just replaced the intake gasket recently then I would for sure be checking for a leak there. Once you have checked let me know the results. Are there any error codes stored. Have you done an obd code read? Quote Link to comment Share on other sites More sharing options...
itspalm Posted April 5 Author Share Posted April 5 Its throwing up 2 codes, bank 1 and bank 2 running too rich Quote Link to comment Share on other sites More sharing options...
Dean2 Posted April 5 Share Posted April 5 Well, outside bad O2 sensors, plugs, coils, plugged pcv and you already changed those I am left with you are getting extra air from somewhere, or your ecu needs to be reset and the ecu being off, unless you did something to change its programing, doesn't seem real likely. Does the car idle at normal rpm, and does it drive normally, just sucking a lot of gas? Quote Link to comment Share on other sites More sharing options...
itspalm Posted April 5 Author Share Posted April 5 It runs good, idle is slightly high at first but once it warms up its normal, and yes its sucking quite a bit of gas. Quote Link to comment Share on other sites More sharing options...
Dean2 Posted April 14 Share Posted April 14 So, did you get it sorted? What was the cause of it running so rich? Quote Link to comment Share on other sites More sharing options...
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