93bluebeast
NAXJA Forum User
- Location
- Oregon
I have a 93 xj ish... driving to work the other day and my idle stared to get real rough, like holy hell thats a crazy cam rough. Got home did a compression test got 122-130 on cylinders 1-5 but on cylinder 6 I got thirty. Took a nifty syringe and tube thing I made (girlfriends a vet tech) and squirted some oil down in that cylinder and retested. Still about 30. So I thought ok great most likely valves. I’m not a mechanic by any means but I figured with the limited knowledge I have that makes the most sense to me. I proceeded to strip it down (manifolds, ps pump, ac bracket etc..) that’s when today I noticed some numbers painted on the side of the block. This got me a little worried so decided to do some quick casting number checking. On my head it’s stamped 2686 and on my block it’s 806mx 27. Now correct me if I’m wrong but I believe this is a 88 Renix motor that got swapped in. I still have the factory 93 ecm with wiring, heck even my injectors are from a 93. My question is what is the difference between the Renix and h.o? Is it just the head? If so I might just go pull one and rebuild it or get a rebuilt one and slap it on assuming that’s the issue with my low compression. Also since it is a 88 do u guys think my time/money would be better spent just pulling/finding a used h.o motor? I’m pretty broke so no freshly rebuilt crate motors for me.