I recently acquired a 2005 LJR with about 64k miles and the 6-speed manual. Yesterday, on a short trip in town, I noticed some strange behavior at idle. I was at a stoplight in neutral with my foot on the brake, and it felt like the engine was being revved. RPM went from normal idle (around 800) to over 1k, and then back down. It did this a couple times - see the video. It continued to do this on the rest of the drive. About 2 hours later, I went out again, and the behavior had stopped.
Some potentially relevant info:
1. I changed the very worn plugs about 5 days ago, but I have only experienced this behavior 1 time in several drives since.
2. I changed out the OPDA for a crown unit about a week ago.
3. It was a hot day (at least for Seattle). Temps were around 85 and I had the AC turned up relatively high.
Video here:
Is this a normal behavior or is indicative of a problem? If the latter, where should I look?
P.S. I'm really loving this community. One of the main reasons I bought the Jeep was to learn to work on cars. I had never done so much as an oil change and with all the great content on this site, I'm learning quickly.
Some potentially relevant info:
1. I changed the very worn plugs about 5 days ago, but I have only experienced this behavior 1 time in several drives since.
2. I changed out the OPDA for a crown unit about a week ago.
3. It was a hot day (at least for Seattle). Temps were around 85 and I had the AC turned up relatively high.
Video here:
Is this a normal behavior or is indicative of a problem? If the latter, where should I look?
P.S. I'm really loving this community. One of the main reasons I bought the Jeep was to learn to work on cars. I had never done so much as an oil change and with all the great content on this site, I'm learning quickly.
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