Join Date: Dec 2018
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
If 4WD - system: QT-II
Current Mileage: 220K
Need advice from somebody who really knows the 5.7l hemi please!
I need some guidance on a issue with a 06 Commander 5.7L vin 2 with EGR (approx 120K) engine ran great until bearing in idler pulley seized,threw belt and overheated. (was driven hot) Next day idler pulley & belt was replaced & coolant added (system was bleed at screw at water pump)Engine started & sounded normal but a chemical test indicated CO2 and I immediately had pressure in cooling system. I suspected a head gasket. I ordered the correct FelPro gaskets,new head bolts,plugs,new waterpump,t-stat,upper rad hose (showed signs of being sucked shut) PLUS a set of remanufactured heads (I didn't want to take the chance of the valve seats in the old heads dropping because of being overheated) When I was disassembling the motor I found the intake was melted at the ports where it bolts to the heads(motor got that hot) Not a good sign but I did have the motor running and it ran good so I continued. No other damage was found but cylinders 2&4 showed signs of coolant. Installed the reman heads & all the other new parts including a used intake and Jeep ran good except for intermittently while driving it would bog down misfire and white smoke would pour out the tailpipe for about 15/20 seconds until it cleared up,the miss cleared up and again the motor would run fine. It took me awhile to diagnose it but I found that the EGR valve was opening and coolant was going thru EGR valve thru tube into intake!! (EGR valve is bolted to front of RS cyl head)Now we know that ain't normal ! SO I pulled it apart again,the head gasket showed it sealed nicely all over,checked all the cylinder walls for cracks (none found that I can physically see) and sent the reman head out to be pressure checked. Today the machine shop tells me the head checked OK. HELP ! I'm hoping somebody here can tell me how coolant can be getting into the EGR port.
As a side note after I found the coolant was being introduced into the intake thru the EGR valve I removed the metal tube from EGR valve,plugged the intake hole and drove the Jeep. This time it ran fine but the EGR valve was blowing coolant all over the inner fenderwell
THANKS in advance for any advice, Carl