Hi everyone. New to posting on the forum. I have an 89 2.5 TBI YJ 5-speed that I bought 2 years ago for $850. Very little rust but it had been sitting in a shed for about 12 years. Pulled the engine, rebuilt it, and got it running. The problem I am having is that it idles and runs rough when the engine is cold. It does not stall but is difficult to drive. 1200-1800 RPMs are the worst. It will occasionally "diesel" when shut off and runs rough for a few seconds after a warm start. After it warms up it runs and drives fine. I replaced fuel filter and injector with no improvement. I tested the coolant sensor to make sure it was working properly to send the signal for the ECU to initiate open loop when the engine is cold. I am not sure if it is actually in open loop like it should be.
Any ideas what I should check next? I am trying to avoid spending needless money throwing new sensors and parts at it without having any idea what will actually help it run better when the engine is cold.
Thanks.
Any ideas what I should check next? I am trying to avoid spending needless money throwing new sensors and parts at it without having any idea what will actually help it run better when the engine is cold.
Thanks.