HunterRivett
NAXJA Forum User
- Location
- Arkansas
Hello! I recently purchased a 1998 XJ Sport (4.0 I6, Auto, 4x4) The original motor was warped crazy and so I had it replaced with another 4.0 I6 from a 1996 XJ. This 1996 motor has 160XXX and the 1998 body has 130XXX. Upon start up, which only happens after a rough and long crank, it will idle relatively fine, and will advance to about 2000 RPMs and then sputter and backfire very rapidly. The spark from the plugs, which are new, is also relatively orange. Compression is good, however cylinder 3 is about 105psi (the lowest of them all) and to my bewilderment, the original engine which had bad compression showed the lowest in cylinder 3 as well. Please any and all help would be appreciated! Thanks.