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Discussion Starter · #1 ·
Hey guys, just got the truck about 2 weeks ago.(2000 4cyl 5spd XE) Everything has been running great.

It has 85k miles. This morning, when leaving the house I noticed when shifting between gears with the clutch in, the engine would continue to rev somewhat. It would fluctuate between 1500 and 2k rpms with the clutch in. I have never noticed this, but am wondering what could be the problem? Can you adjust the clutch?
 

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sounds like an idling issue as your truck is in nuetral with the clutch depressed. are you feeling any slipping or grinding/notchiness when shifting?

you can alter the engagement point by adding/removing brake fluid from the master cylinder
 

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Discussion Starter · #3 ·
Actually with the truck in gear but with the clutch in is when it would stay rev'd up. but if i put it in neutral, it would go back to idle.

The shifting feels just a little notchy, but the only thing I have to compare is to other newer cars Ive driven stick in..

I have not been able to reproduce the same problem since the other morning, maybe just because it was still cold?
 

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I may be mistaken, but isnt there a vaccum advance going to the transmission?

Actually with the truck in gear but with the clutch in is when it would stay rev'd up. but if i put it in neutral, it would go back to idle.

The shifting feels just a little notchy, but the only thing I have to compare is to other newer cars Ive driven stick in..

I have not been able to reproduce the same problem since the other morning, maybe just because it was still cold?
 

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Actually with the truck in gear but with the clutch in is when it would stay rev'd up. but if i put it in neutral, it would go back to idle.

The shifting feels just a little notchy, but the only thing I have to compare is to other newer cars Ive driven stick in..

I have not been able to reproduce the same problem since the other morning, maybe just because it was still cold?
ok it sounds like maybe the clutch wasn't fully disengaging which is a lot easier to treat than slipping.

maybe it's an intermittent thing, but it'll probably come back at some point.

i'd double check the fluid in the master cylinder and hope the problem goes away. if it continues, then flush the fluid (possible moisture build up) and rebuild the master & slave cylinders while you're at it

it's all pretty simple stuff to do with any basic back yard mechanic skills

I may be mistaken, but isnt there a vaccum advance going to the transmission?
maybe, but i'm not sure how that would affect the clutch hydraulics. i could be way off though
 

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my truck does this once in a while.. not a big deal to me.

Probably whoever did your clutch must kinked, broken, or disconnected a vacuum line. Go to the pass side and see if anything looks outta place, or disconnected.

I may be mistaken, but isnt there a vaccum advance going to the transmission?
No..

manuals dont have anything like that going to the trans. And the automatics are computer controlled.

I think you're thinking of gm transmissions.
 

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Vacuum adavnce is for distributors, Gm transmissions used to use a kick down cable that was connected to the throttle, basiclly when you stomped on the gas it would down shift the transmission. Changing the level of fluid wont do anything unless it is already low and you are sucking air but that would give you a soft pedal. You have an idle problem, possible mass air flow sensor going haywire. I had a MAF sensor go bad, the computer gets the wrong reading from it and so it (the engine computer) searches for the correct idle, making it run up and down.
 

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Discussion Starter · #9 ·
Ok guys tonight I realized it only happens when the ac is on. Not really sure why or how its doing this. I understand that with the ac on, the idle will be higher, but this is not normal as it will go up and down around 2k rpms
 

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My truck is doing this too! Not just w/ the AC on, but all the time. I took a video of my tach earlier, but have no idea how to share it with you guys to explain it better... I think I'm going to try cleaning the MAF. The truck has newer plugs and wires, cap, rotor, etc. Just did a complete fuel system cleaning, including throttle body.
 

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My truck is doing this too! Not just w/ the AC on, but all the time. I took a video of my tach earlier, but have no idea how to share it with you guys to explain it better... I think I'm going to try cleaning the MAF. The truck has newer plugs and wires, cap, rotor, etc. Just did a complete fuel system cleaning, including throttle body.
its your IAC.. gone thru 4 of them so far, take ur TB off and take the IAC off and spray wd-40 and shake, repeat.. then use RTV red seal.. hell it beats 200$
 
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