dracon79

Well I replaced the cps that didn't work either. I replaced the fuel filter no good either. I try checking the ecu and cat. Going to check the tps again with my voltmeter but I replaced that just months ago so I don't think that could be it. So weird that it only does this when its cold once it warms up no problems.

Ok I got a vaccum pump tester and did the tests that are on this page to the egr solenoid. http://www.lunghd.com/Tech_Articles/Eng ... ostics.htm As he states in the test that when the connector is plugged in and engine hot there should be vaccum but there is not I tried there is only vaccum when I unplug the connector. I used a voltmeter to test the connector and as far as I can tell it always gets juice. So I am not sure if this is a solenoid issue or a engine computer issue.

I replaced the egr with a brand new one and it is still doing the same thing even put in a new fuel pump can't figure this one out. I checked the egr solenoid and it seems good has vac and power. CTS,fuel pump, air filter, is also been replaced. TB is tightly secured. can't seem to figure this one out. :???:

I have an 88 comanche with the 4.0l. When I press the needle in the test port on the fuel rail while its running or with just key on it just drips out. Shouldnt be under alot more pressure?

I don't think it could be bad compression it doesnt use any oil and it takes forever before the oil even changes color.

I have an 88 jeep comanche with the 4.0 in it. When I first start the truck after it has been sitting a while like over night, you go to hit the gas and the rpms drop and almost dies and sometimes does die. But as soon as you let it warm up that goes away. Also at high speeds with a load like going up a hill on the highway it starts to buck a little like its not getting enough fuel. I'm thinking maybe fuel pump? I replaced the tps and stepper motor and o2 sensor no change.

ok well Ill buy some synthetic and run it through just got the plain stuff in there now

yeah thats what I figured so it must be some kinda of grounding issue/electrical problem...

Can I do just a straight swap. ba 10/5 with an ax-15 or is there conversion stuff you need to do?

is there a better 5 speed tranny I can swap out?

I have an 88 jeep comanche 4.0 with a 5 speed tranny. When the engine idles it would stay at 180 or so. It has a 180 thermo in it. After driving it then I idle it would go to like 230-240. So I replaced the coolent temp sensor and the coolant guage. Now when I idle before driving it, it goes to like 220 after driving it and I idle it goes to like 270. But I don't hear any gurgling and no fluid increase in the resv so I am at a loss. I think its the guage still even know I replaced it. I shot one of those infrared temp readers at the thermy housing when the guage was reading 270 and the reader showed 216 the hoses were all at about 170-180 so I am very confused.

I have an 88 jeep comanche with a 4.0 and a 5 speed transmission. I was wondering what the model was on it? A peugot something?