on my 05 wk,4.7 I am getting the elusive hesitation/stumble/on light throttle pressure when cruising at speeds under 80 km/hr.seems like slight ign miss ,with constant throttle it seems to have a slight surge up and down at lower speeds below 90,also exhibits an intermittent high idle (700-750 rpm compared to usual 500-550 rpm)and also sometimes at normal idle it is slightly rough(can feel slight shake in veh)other times its smooth as silk,with hvac on or off eliminating compressor load,today i exhibited another symptom on startup cold,i started jeep ,it died when i went into gear ,then it cranked over 3 times as long to start,after starting it went to 700-800 rpm and wouldnt come down for a few minutes(temp 10 celcius,seems to be getting progressively worse ,a few times at 80 k when taking foot of gas it bucked a bit almost like torque converter clutch not disengaging)i can also hear a hiss by egr valve,not quite a vac leak hiss ,more like air rushing noise.at speeds 100 km/hr plus ,it seems perfect. i have replaced plugs,cleaned iac and port,killed all the mosquitos in my neihborhood with seafoam,lol,cleaned tbody,ran seafoam through fuel tank and oil,tried different grades of fuel,replaced tps,i have an obd II scanner and no codes are present and i have never seen a "check engine" light come on ,it seems like a possible egr concern in my guess from symptoms but it in my view should set codes as dpf sensor monitors this,has anyone had egr failure with similar symptoms with no codes?,i have not had software updates yet but jeep has 140000 km on it ,if software was needed i would think it would have had issue before now
I may just go to steeler tomorrow and get updates done ,but I still am guessing egr leak /sticking open.sorry for the long post but the more details the better in this problem,any ideas from the wk brotherhood?
I may just go to steeler tomorrow and get updates done ,but I still am guessing egr leak /sticking open.sorry for the long post but the more details the better in this problem,any ideas from the wk brotherhood?