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Hello to everyone on the ETCG forum. I’m new to the forum, but very acquainted with the repair videos posted on YouTube. They’ve been a good resource. However, I’m stumped with this 1999 Jeep Grand Cherokee- 4.0 I6. Having just replaced the lifters, and put everything back together – when I start the engine, it is at full throttle. I have checked all connections, and vacuum lines, and cannot figure this one out. Has anyone ever encountered this as well, and what advise can you give me? Thanks!
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Well, so much for a binding throttle cable. Nothing binding, and nothing cracked or broken, and butterfly is closed on throttle body. It’s still a mystery.
did you remove the throttle body position sensor when doing the lifter job? maybe it got put on backwards?
How is the wiring to the Throttle Position Sensor and Air Flow mass meter? I had to replace mine with some good old ones out of a wrecking yard. Saved me a bunch of money and solved my idle issues. You might have damaged those wires while working on the lifter assembly so I would start there and take a closer look make sure nothing got pinched. Two sensors right at the throttle body and they are sensitive. I have found my Jeeps like only Jeep parts so don’t rely on aftermarket replacement parts cause they just don’t work well with Jeeps. Crank position sensor is one that I know for a fact. I really like the Jeeps they are pretty easy to work on and reliable low cost buggies. Still have a couple in the family getting there share of use on our rural property. We do abuse them regularly.
TPS was not removed during lifter job. All sensors were unplugged when intake was removed. TPS was only unplugged after engine was cranked to see if that process would make a difference in idle. It did not.
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