Engine Performance problem
2002 Dodge Intrepid 6 cyl Two Wheel Drive Automatic 70000 miles
I bought a 2002 Dodge intrepid SE 2.7L and not even a week went by when the car engine failed due to oil sludge. I bought an engine at a junkyard and they installed it at the same place. The car works fine until it reaches 2500 RPM, then it jerks. It does it weather in gear or in Park if pushed to 2500 RPMs. Also sometimes it won't turn on on first or 2nd try. I found out from another mechaninc that they used a 1998, or 1999 2.7L engine. It appears to be a timing issue but timing has been set three times, also cran and cam sensor replaced, and reprogrammed car's computer, none of it works. Is this engine not compatible?
Remove electrical and vacuum harness retaining clips from valve cover studs. Remove ignition coils. Remove valve covers. Rotate engine until number one cylinder is at TDC of exhaust stroke. Ensure intake camshaft sprocket timing mark is at 90 degrees from valve cover mating surface on both cylinder heads.
Count chain pins from mark on intake camshaft, toward exhaust camshaft. If 12 chain pins exist between timing marks on intake camshaft and exhaust camshaft, camshafts are timed correctly. See Fig. If marks are not positioned as previously stated, ensure timing chain is not stretched.