Have you done an Italian Tune Up on your 3.7L? Did it help, or did you destroy it?

Share your experience. But please omit speculation and caution from the sidelines. I am trying to assemble some real data here from Jeep owners.

Thanks.

I did when I first got my KJ, but that was to make sure it ran well and was strong, not to blow out carbon. I haven't done one since. My 3.7 is still running strong. Modern fuel blends and oil go a long way.

The only vehicles I knew that actually benefit from the old "Italian Tune-Up" are ones with carbs or from a time of crappy gas and oil. A can of Seafoam or similar will clear out the carbon without having to dog your engine and driveline at redline. Now for a direct injection gas vehicle motor it might be of some benefit to clean those intake valves since they get no fuel spray. But for a 3.7 that is fuel injected and uses (I assume) decent oil that is changed regularly, then the Italian tune up is pointless. Even short trips aren't a problem since motors warm up fast and use lots of detergents in the oil. This technique is from a bygone era for bygone vehicles.

Check Bob Is The Oil Guy (BITOG) forums on Italian tune-ups and things like that.

_________________
'04 Liberty - exactly like all the other ones out there, but now I have 4WD!
'91 Cherokee - Spartan Government Edition, no heat, no AC, 4 cylinders, 5 speeds, no 4WD

seafoam + italian tune up == many lost HPs returning.

_________________
2007 Jeep Liberty Sport 4x4 3.7L 6spd

• MOABs with Goodyear Wrangler All-Terrain Adventure With Kevlar 245/70R16
• JBA UCA 4.5
• OME 790/948/90009/N32
• Western Suburbanite 7'4" plow
• DetoursUSA Backbone
• HF 12k# winch

[SIZE="1"]WTB: project liberty near N.NJ. stick shift, 4x4, working motor optional, CHEAP[/SIZE]

Just be careful about cleaning additives on old unknown vehicles. Sometimes that gunk is strategically sealing something up. After I did some Seafoam in my Cherokee the rings got even worse, and I could fill a 10oz oil catch can in about three days with the blow-by. A can of Restore helped a little.

_________________
'04 Liberty - exactly like all the other ones out there, but now I have 4WD!
'91 Cherokee - Spartan Government Edition, no heat, no AC, 4 cylinders, 5 speeds, no 4WD