2005 Jeep Liberty 3.7 V6 Automatic transmission , 4x4 .
I just replaced the engine in this vehicle with another one also out of a 2005 . I bought a wrecked Liberty that still run & drove so I heard the engine run before I bought it . It sounded good & I revved it up several times & it acted fine . Today I completed installing it in my Liberty & it’s good to about 2000 rpm’s then it acts like it’s governed . Holding the accelerator pedal steady the engine rev’s up & down continuously . The engine bogs if I try to run it above about 2000 rpm’s . I don’t have a code reader yet so the codes haven’t been read . Any ideas ?
I just completed the installation a couple hours ago & haven’t done any troubleshooting yet .
Had codes on two cylinders related to spark plugs or coils . Pulled a couple spark plugs & I’m relatively sure they were the originals . Installed a new set of plugs & the 2 plug related codes went away . Engine still acted like it was governed . Had a little squeak so removed the serpentine belt to see if the squeak would go away . Found the belt tensioner bolt loose . Started the engine without belt on & engine will rev like crazy & sounds great . Put belt back on & back to original problem . Unplugged & disconnected wires from alternator & ac compressor & that didn’t help . Took belt back off & engine runs great again . Just came in for a cup of coffee & haven’t searched the internet yet for what might be causing this .
Will be back a little later to see what gets said about this problem .