Only happens under load under 2500 rom any higher it clears up and also has low idle after warmed up seams to run good until then no check engine light previous owner replaced a ton of sensors and got frustrated and sold it to me any help would be greatly appreciated thanks in advance
No codes fuel pressure is at 35 psi key on engine off and 50 at idle no change when I unplug fuel pressure regulator which has also been replaced engine has good vacuum and I can't get ahold of a obd1 scanner
Tried blowing thru the return line to the tank and it seams as if it's blocked hooked a hose to the return line and out it in a bucket and now fuel pressure is at 33-35 at idle gonna try to see what I can find out to clear or replace the line
timing chain? bad/clogged injector? Could be many things. When my old xj did something like this, I took off the throttle body, removed all sensors and cleaned it up in carb dip, couple new gaskets and the problem vanished. Might have to take it to someone who knows their stuff before you dump a ton of money fixing stuff that isn't broken
1989 Base YJ, 4.2l, Motorcraft 2150 carb, CRT HEI ignition, ax15, np231 JB conversions SYE, D30 ARB & Ford 8.8 ARB 4.56, 35x12.5r15 Goodyear MTR's, bds 3.5" springs, 1" body lift, and 1/2" Boom Shackles.
Build Thread: http://www.wranglerforum.com/f330/fi...ld-385106.html