1995 4.0 with 233k highway miles. Oil changed every 3k for most of its life. Power up a particular hill near me has been the same for the last 10 years. It gets about 21 mpg and has for a long time. It has had a slight miss at idle, and has for years, but it baaaarrely squeaked by emissions this time, so I'm trying to track it down. I did a compression test a few weeks ago about 3 hours after driving, and just did one right now, wet and dry, an hour after driving. I poured 1 tablespoon of 10W-40 down each cylinder for the wet test.
I live at 6000' altitude, so divide these by 0.8369 to see what these numbers would look like at sea level
Here are the results
Cyl Dry1 Dry2 Wet
1) 123 110 143
2) 115 115 150
3) 123 118 163
4) 120 119 158
5) 127 122 165
6) 123 108 130
Weird. I was hoping to see more consistency between the dry tests. All the cylinders went down except 2 and 5 when the engine was warmer. Looks like I have a valve issue on 6.
So...time to put this engine out to pasture? I've never had a car long enough to warrant a rebuild. What would one cost for a 4.0, preferably with a stroker? Most likely though, I'll probably just sell the whole rig to someone out of town who doesn't have to go through emissions, and is perhaps mechanically inclined enough to rebuild it themselves.
Also, after I was all done, I let it sit for an hour and retested cylinder one. I got 120 wet, and 175 dry!
I live at 6000' altitude, so divide these by 0.8369 to see what these numbers would look like at sea level
Here are the results
Cyl Dry1 Dry2 Wet
1) 123 110 143
2) 115 115 150
3) 123 118 163
4) 120 119 158
5) 127 122 165
6) 123 108 130
Weird. I was hoping to see more consistency between the dry tests. All the cylinders went down except 2 and 5 when the engine was warmer. Looks like I have a valve issue on 6.
So...time to put this engine out to pasture? I've never had a car long enough to warrant a rebuild. What would one cost for a 4.0, preferably with a stroker? Most likely though, I'll probably just sell the whole rig to someone out of town who doesn't have to go through emissions, and is perhaps mechanically inclined enough to rebuild it themselves.
Also, after I was all done, I let it sit for an hour and retested cylinder one. I got 120 wet, and 175 dry!