So i have an 86 Jeep Cherokee with a 2.5L 4 Cyl TBI engine, CEC computer controlled etc. Jeep starts fine, idles decent, engine revs great. Once the engine is under load (in gear) it has a hard time accelerating, almost like it is lacking fuel or air. I've dropped the gas tank and replaced the gas, the sock is clean, the filter has been replaced, i can see the injector pumping fuel into the throttle body. Ignition timing is non-adjustable, but correct according to spec, and advancing correctly. All vacuum tubes have been replaced and verified to be hooked up to the right stuff. the EGR will not hold a vacuum, but im' not sure that it would cause this problem. Compression is good and even across all cylinders. air filter clean. TPS registers good. O2 sensor registers good, and MAP registers good (they are all withtin the allowable voltages according to the service manual. New plugs, wires and dist. cap.So, any ideas why this thing feels like the parking brake is on (it's not)
9/11/2006 12:40:18 AM
9/11/2006 12:54:25 AM
ah i forget to mention the exhaust is gone from the header back... To test the egr you can push under it with your finger and it's supposed to stall the engine...i can tell a difference in the engine, but not much. When i put vacuum pressure on the egr with a hand vacuum pump, it does not maintain the vacuum...in other words, i'm pretty sure there's a hole in the diaphram
9/11/2006 1:03:32 AM
9/11/2006 1:20:58 AM
that's the next thing for sure is an exhaust...the o2 is right on the manifold, it appears to be throwing a good reading at this point. thanks for the input this far
9/11/2006 1:24:14 AM
gas filter!!!
9/11/2006 1:29:53 AM
9/11/2006 1:44:41 AM
FAS GILTER!!!!!!
9/11/2006 2:46:25 AM
9/11/2006 8:00:28 AM
Could a bad cat cause a misfire in one cylinder?
9/11/2006 9:15:35 AM
9/11/2006 9:32:55 AM
Ignition timing is 12° BTDC idle and advances to 26° @ 2000 RPM i think...close to that. I'm not sure why it's so far btdc, most cars i've worked on are around 6-8 btdc
9/11/2006 9:52:38 AM
That's not unacceptable in the least.
9/11/2006 9:54:38 AM
maybe a bad MAP sensor or no vacuum getting to it
9/12/2006 7:58:24 AM
9/12/2006 3:53:02 PM
you'd be far better asking this question on http://www.naxja.org/forum
9/12/2006 9:20:42 PM
torque converter or some shit like that?
9/12/2006 10:31:24 PM