Fern Posted April 21, 2019 Report Share Posted April 21, 2019 I recently changed my sparkplugs on the 3.5L 2009 Dodge Journey to get better fuel economy from 18.9l per 100 km but noticed a problem after changing the plugs. At idle the gauge shows I get up to 30l per 100 and keeps going up drastically, when cruising between 1500 to 2000 rpm it says I get as low as 16 but as soon as I make a stop or idle or go past 2000rpm it goes up to the 20’s , what did I F**k up now? Quote Link to comment Share on other sites More sharing options...
2late4u Posted April 21, 2019 Report Share Posted April 21, 2019 depends on what you did? did you use the approved oem Plugs? and more important check your mpg the old fashioned way,gallons used divided into the miles driven over 2 tanks of gas.also recheck every thing you did make sure everything is plugged up correctly,problem has to be something you did as you say it was running good before you worked on it. jkeaton 1 Quote Link to comment Share on other sites More sharing options...
Fern Posted April 21, 2019 Author Report Share Posted April 21, 2019 Yea the plugs I used are fine, I rechecked the work I did multiple times I don’t see anything that could be wrong , there are only 4 connectors and they all are on properly , all lines are on properly, after all the work when I went to turn the car on, the gauge still read 18.9 as it did before I changed the plugs so then I tried pressing and holding the button to see if it would reset or re calibrate it , that’s when it started giving me all these whack numbers. Quote Link to comment Share on other sites More sharing options...
OhareFred Posted April 21, 2019 Report Share Posted April 21, 2019 Isn’t the 3.5 a 6 cylinder? I know my 09 is a 6 and pretty sure it’s a 3.5, but might be wrong. If not you missed 2 plugs.... 2late4u and mechanical-idiot 1 1 Quote Link to comment Share on other sites More sharing options...
mechanical-idiot Posted April 21, 2019 Report Share Posted April 21, 2019 (edited) He did save some money though! But now he has a 4 cylinder! mechanical-idiot Edited April 21, 2019 by mechanical-idiot OhareFred 1 Quote Link to comment Share on other sites More sharing options...
jkeaton Posted April 21, 2019 Report Share Posted April 21, 2019 (edited) Don’t rely on the onboard mpg indicator. Calculate the old fashioned way. And change the other 2 plugs Edited April 21, 2019 by jkeaton mechanical-idiot 1 Quote Link to comment Share on other sites More sharing options...
Fern Posted April 22, 2019 Author Report Share Posted April 22, 2019 (edited) ??? What do you guys mean. I’m not that stupid to think it’s a 4 cylinder. I changed all six plugs Update: all I had to do was disconnect the battery, let it sit 10 min for all settings to reset, than put it back on, I know get 13L per 100 after changing all SIX sparkplugs on my 6 cylinder car.... Edited April 22, 2019 by Fern jkeaton, mechanical-idiot and 2late4u 1 2 Quote Link to comment Share on other sites More sharing options...
2late4u Posted April 22, 2019 Report Share Posted April 22, 2019 3 hours ago, Fern said: ??? What do you guys mean. I’m not that stupid to think it’s a 4 cylinder. I changed all six plugs Update: all I had to do was disconnect the battery, let it sit 10 min for all settings to reset, than put it back on, I know get 13L per 100 after changing all SIX sparkplugs on my 6 cylinder car.... well you did say you connected all 4 connectors, but glad it all worked out great for you, take care Quote Link to comment Share on other sites More sharing options...
OhareFred Posted April 23, 2019 Report Share Posted April 23, 2019 When you say there are only 4 connections, how are we supposed to know how stupid you are? Maybe you missed two, wouldn’t be the first time someone missed something mechanical-idiot, larryl and 2late4u 1 1 1 Quote Link to comment Share on other sites More sharing options...
Johnny Cache Posted May 12, 2019 Report Share Posted May 12, 2019 I'll give Fern credit for doing the job, must have been a typo. I do it all the time myself, even smart people goof. jkeaton 1 Quote Link to comment Share on other sites More sharing options...
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