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Old 01-16-2017, 04:31 PM
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'99 TJ Hard Start Condition

My step-father has a 1999 Jeep Wrangler with 2.5l which he bought used from a dealer. This is an Illinois transfer to Missouri.

No codes or any issues with the Jeep other than this hard to start condition. After sitting for days, the Jeep is hard to start and requires application of the "clear flood mode" by means of putting the accelerator on the floor.

Yesterday I removed the IAC, cleaned it up, checked the throttle body bore and also inspected vacuum lines. The only oddity was a maple syrup colored liquid located in the flat area of the intake; visible by moving the butterfly in the throttle body. Using carb cleaner, I cleaned up the throttle body, plate, etc.,. and dried out the liquid in the intake.

Engine turned over rapidly, attempted to fire, but would not. Used the "clear flood mode" starting procedure and was able to get the Jeep to fire up. Let it run a minute, turned it off and restarted. Looked in the throttle body, opened butterfly and did not observe any liquid. With the engine off, I waited about two hours. After waiting and subsequently checking the intake, I again observed the liquid by viewing it through the throttle body. After getting the engine running, it will idle properly and highway driving exhibits no issues at all. Passing gear and engine performance are on par for my experience with the 2.5l.

My diagnosis is a leaking fuel injector. Anyone else have this issue or another observation regarding something else to check?

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Old 01-29-2017, 12:01 AM
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Hard start condition appears to be resolved. Purchased reman injectors from eBay and put them in tonight. Will let it sit, overnight, and see how it responds in the morning.
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