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Originally Posted by oramey
New idea!!
Have you removed the throttle body injectors? (If it has them) If so, is it possible that you might have nicked the orifice at the end of the injector?
That would make the fuel mist inconsistent and could cause a rich scenario that might cause it to idle high.
One more thing, If it sat for a while, a mud dobber (insect that loves to build nest in round holes... a southern US thing mostly.. ) might have tried to build a nest that might be clogging one of the vacuum lines or something else.
Just a thought.
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Thanks, but I just found out (at least part of the problem) was that the fast idle cam roller arm was jammed (stuck). I followed the manual in adjusting the roller with the aligning mark, then tried to adjust the clearance between the cam plate with the alignmnet mark and the roller. The second adjustment wasn't working, and it was now stuck in super-high rocket idle. Following the manual, turning the screw to make the clearance adjustment didn't do anything until I figured out that I needed to loosen the center "lock nut" that holds the throttle lever and the adjusting screw together. Once I loosened that, I was able to turn the adjusting screw and was able to create the clearance between the roller and cam plate, thus dropping the idle back down to a safe idle. I had also sprayed the throttle body parts down with a cleaner/lubricant during this to help clean and unstick parts. I just replaced the thermo element last night. Personally I think the new element allowed me to make better adjustments than the old one did. The old one's plunger looked like it was not pushing right and was trying to throw the levers out of adjustment again. It now looks like a textbook adjusted assembly with the new thermo element instead of the sloppy apperance with the old one. Of course so many things were cleaned and moved around during this it may have been a combination of many things.
Anyway, thanks for your input. For everyone's knowledge, I did find out from a Nissan tech that was working on Nissan trucks back around the 80's(maybe 90's as well) that they were known to have weak throttle bodies. He said it wasn't uncommon to have a truck at 80,000 miles needing to have the throttle body replaced to solve rough idling problems. I heard the term "bad harmonic balancer" used. Maybe this is the cause of some of the rough idle issues posters have been reporting here. He said mine was bad as well (had him take mine apart and check it out), but it wasn't $1500.00 bad. I can live with the uneven idle for that kind of money (it's really not that bad anyway, I just wanted him to take it down and clean and re-adjust everything anyway). Anyway, he said even if I replaced it who's to say the new body wouldn't go bad in another 80,000 miles (I guess poor Nissan design). And of course that for obvious reasons leaves out junk yard used throttle bodies, not worth the time or money.