Dad has a 1991 yj with a 4.0L and an auto tranny. Hard to start in the morning after sitting overnight. The engine just cranks and cranks for several seconds before firing. once it fires, it runs great. AND will start for rest of the day. Hot starts and even Hot soak starts are no problem. Only "overnight" cold. Truck has had full tune up(ignition bits, filters, pcv, etc) and even has had the temp sensor near the thermostat replaced as well. No change. If anything, the cranking when cold is getting longer. Any ideas????
Here's the real funny part. During the winter, the jeep started instantly everytime. It didn't matter if it was 30, 10 or even -5 degrees. Nso problem. It's only been mid spring to present.
thanks for your time