blistovmhz
NAXJA Forum User
- Location
- Vancouver, BC
I had a couple bad exhaust valves on my 98 xj (4.0L), so I dropped in a reman. head yesterday. The stumbling went away, and the ECU isn't throwing any codes. However... *sigh*....
During my first test drive, I did some hard acceleration, and then came to a stop and idled for a few seconds, and heard some fairly serious tapping. Sounded like valves to me, but I'm no expert. The tapping went away after about 2 seconds and hasn't returned since.
Next, on real hard acceleration I heard what sounded like scraping for a second or two. I've been fooled before into thinking this was a cylinder wall being destroyed when in fact it was just a vacuum leak, but I can't find any leaks.
Next, I'm not positive but I think my oil pressure is lower at idle than it used to be. I did change to a non-synthetic oil for the break in and cleaning, but I'm not sure that'd make that big a difference.
The fuel economy has increased substantially from 12/16mpg to 17/21mpg, but I don't feel any increase in power. I've got 4.10's on 31". I should be screamin' off the line with a new head. My 92 with 500,000Km on it accelerated slightly faster.
Did I just trash my block?
I'm supposed to be heading out to BC on holidays (1400KM drive) tomorrow. Would be nice to know if I should bring a spare engine and my garage with me
During my first test drive, I did some hard acceleration, and then came to a stop and idled for a few seconds, and heard some fairly serious tapping. Sounded like valves to me, but I'm no expert. The tapping went away after about 2 seconds and hasn't returned since.
Next, on real hard acceleration I heard what sounded like scraping for a second or two. I've been fooled before into thinking this was a cylinder wall being destroyed when in fact it was just a vacuum leak, but I can't find any leaks.
Next, I'm not positive but I think my oil pressure is lower at idle than it used to be. I did change to a non-synthetic oil for the break in and cleaning, but I'm not sure that'd make that big a difference.
The fuel economy has increased substantially from 12/16mpg to 17/21mpg, but I don't feel any increase in power. I've got 4.10's on 31". I should be screamin' off the line with a new head. My 92 with 500,000Km on it accelerated slightly faster.
Did I just trash my block?
I'm supposed to be heading out to BC on holidays (1400KM drive) tomorrow. Would be nice to know if I should bring a spare engine and my garage with me