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Old 03-23-2013, 01:41 PM   #21
Aaron K.
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2001 SC1
Default Re: Rough idle and random high idle

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Originally Posted by DocBA View Post
This is an outside the box idea, but if you can view when the EVAP system is opening on your scanner, you might be able to see if the high idle is happening during an EVAP event, if it is you might have a cracked hose, fitting, etc.
I dont know if my scanner app will show me that, but I'll check the next time I go out to mess with the car.

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Old 03-30-2013, 07:38 PM   #22
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Default Re: Rough idle and random high idle

Any ideas on why the brand new TPS still reads out of range?

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Old 04-01-2013, 12:21 AM   #23
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Default Re: Rough idle and random high idle

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Originally Posted by Aaron K. View Post
Any ideas on why the brand new TPS still reads out of range?
Did it come from Autozone??? lol Worked there for a good while and noticed alot of defective parts, including the front wheel bearing i purchased and drove on for 2k miles before it fell apart. got a complete spindle unit from a junk yard for 30 bucks, got my 60 back for the destroyed bearing from Autozone. Orielly has some pretty decent parts much rather recommend them. just my opinion no offense to anyone

...
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Old 04-06-2013, 10:33 AM   #24
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Default Re: Rough idle and random high idle

No, I got it off amazon. I haven't had much time to mess with this issue because I had to replace the radiator the other day and now it seems the battery is on its way out. Now that I think about it, could a bad/dying battery throw the TPS out of whack?

Anyway, I don't think the TPS is the cause of the rough idle, and I already have the intake manifold gasket, so I think I may just replace it anyway.

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Old 04-06-2013, 10:58 AM   #25
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Default Re: Rough idle and random high idle

low battery voltage definately cause all sorts of woes with this car

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Old 04-06-2013, 04:32 PM   #26
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Default Re: Rough idle and random high idle

New battery....same TPS voltage and the same rough idle.

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Old 04-12-2013, 04:27 PM   #27
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Default Re: Rough idle and random high idle

Replaced the intake manifold gasket....no change in idle. TPS voltage now reads .74 - 4.03. WTF?

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Old 04-12-2013, 08:14 PM   #28
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Default Re: Rough idle and random high idle

Not sure why a new tps failed to correct this issue except for a non OEM part? Any vacuum leaks not checked for? Worn throttle pivots allowing a vacuum leak? Try spraying around the throttle pivots with the engine idling.

List all that was done.

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Old 04-13-2013, 02:09 PM   #29
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Default Re: Rough idle and random high idle

I've replaced/cleaned the following:
- Replaced plugs
- Replaced wires
- Replaced PCV w/ fixed opening
- Replaced front O2 sensor
- Replaced thermostat
- Replaced TPS
- Replaced battery
- Replaced intake manifold gasket
- Cleaned TB
- Cleaned IAC
- Cleaned EGR
- Cleaned post secondary air induction ports in exhaust manifold and head

The TPS is an OEM ACDelco PN 21024706. I'm gonna try putting the old one back on and see what kind of voltage readings I get. What do you mean by throttle pivots? I've tried spraying carb cleaner around all the vacuum lines I could find as well as all over the engine bay in general in case I missed something several times now with no result. One thing I haven't changed is the ETCS because when I checked it when I got the car, it was brass tipped and all the connections looked good. I probably should have done it before the IMG, but I think that will be my next step since its cheap and easy enough.

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Old 04-13-2013, 03:04 PM   #30
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Default Re: Rough idle and random high idle

The brass sensor stains from normal use and is just a cosmetic appearance, having no effect on electronic performance. As long as the temperature gauge indicates anywhere from 3/8ths to 1/2 then the coolant sensor and t-stat are in good operating condition. The engine warming up quickly and displaying needle position at 3/8ths within 10 minutes of driving is another indication of good parts operating as designed.

Throttle pivot holes; the throttle plate is attached to the throttle shaft with one end of the shaft protruding out the side of the throttle body to have a throttle cam, return spring and cable attachment while the other end of this throttle shaft is hidden by the throttle position sensor. The throttle shaft may wear down the drilled holes over the years and allow a vacuum leak for air entry. There may be a felt washer or two on both sides of the throttle shaft that prevents air ingestion and may be worn. This may cause erratic changes in idle sometimes. While not a common occurrence it should be considered and checked by examining the throttle linkage; disconnecting the throttle cable will release any tension and allow you to move the throttle by hand and see if any side play exists - opening/closing throttle and see if any side play occurs that would imply the throttle shaft holes are well worn and may allow a small amount of air to cause erratic idling.

Any aftermarket electronics? Battery, battery cables, their connections possibly loose? Loose/worn belt tensioner allowing the alternator to slip and not operate smoothly to supply all the electrical needs of the car's electrical/electronics? Measured battery/alternator output? 12.3v on standby, 13.3v-14.7v engine idling?

...
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Last edited by fdryer; 04-13-2013 at 03:14 PM..

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Old 04-13-2013, 03:34 PM   #31
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Default Re: Rough idle and random high idle

You may have to perform an iacv test to check its capability to operate correctly; with a fully warmed engine, cover the small hole in front of the throttle plate with a finger (this is the iacv bypass air port), the engine will drop idle down to 500-600 rpm to reflect factory throttle setting, unblock the hole and the low rpm idle will jump immediately then return back to normal idle. Simply blocking the bypass air port sets off the pcm to command the iacv to retract and allow more air into the (blocked) bypass port but since its blocked the iacv retracts fully because the pcm hasn't detected any rpm rise. Removing your finger to unblock the port now allows a sudden rush of additional air into the engine via the iacv in fully retracted position to suddenly raise engine rpm quickly until the pcm notices and quickly commands the iacv to extend until the rpm's return back to normal, 800-900 rpm. The iacv is tested for complete retraction and extension this way. Any slow movement, stickiness or no movement will be seen as idle speed changes different from what's described.

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Old 05-26-2013, 11:32 AM   #32
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Default Re: Rough idle and random high idle

Well I haven't really messed with this issue in a while. I got tired of checking this and changing that and getting nowhere. Last time I did anything was about a month ago when I put the old TPS back on. The voltage remained in the .74 - 4.03 range, same as with the new one, so there must be something else causing the odd voltage. Also, the car hasn't done the typical bad TPS thing revving up to 2K when coming to a stop like it occasionally did before.

Unless I'm feeling overly motivated (not likely) or I get real tired of the rough idle I'm gonna let my MPG be my gauge as far as when I'm gonna mess with this issue anymore. I'm getting about 34.5mpg on average with about 90% highway driving at 80mph. I feel like I could do a little better, but I figure that's pretty good so I'm just gonna let it ride as is for now.

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Old 04-22-2014, 12:41 AM   #33
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Default Re: Rough idle and random high idle

Quote:
Originally Posted by Aaron K. View Post
I just went out and re-cleaned the TB and IAC and to double check all my vacuum lines and all. TB was pretty dirty, almost like I had never cleaned it before, but it cleaned up much easier than the first time. The IAC looked good but I cleaned it again anyway. I haven't put it all back together yet so I dunno if what I've done has fixed anything yet, I'm taking a lunch/ask a question break.

Of the two vacuum tubes that mount to the top of the TB, the smaller one runs to the front of the car to the secondary air/smog pump. The larger one runs to the back of the engine to some sort vacuum junction type of thing underneath the intake manifold and above the starter. It looks like there is at least one more line that runs to it (fuel line, maybe a return line or something). What is it and what does it do? I can barely see it from the top. It's a little loose, I can wiggle it a little with my finger.
air/smog pump? Do you mean the opposite end of the plenum from the throttle body? At the passenger side of the plenum is the MAP sensor. There's an electrical connection and a vacuum hose.

...
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Old 04-22-2014, 01:55 AM   #34
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Default Re: Rough idle and random high idle

Have you done a compression test?

My 99 has a rough idle, but starts up, and cruises down the freeway with a slight stumble if the revs get under 2,500

Just did a compression test and I got, 147, 32, 163, 0 I am really surprised at how well it runs with a dead cylinder. Well 1.75 dead cylinders.

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Old 04-22-2014, 12:25 PM   #35
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Default Re: Rough idle and random high idle

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Originally Posted by BIGGUNDOCTOR View Post
Have you done a compression test?

My 99 has a rough idle, but starts up, and cruises down the freeway with a slight stumble if the revs get under 2,500

Just did a compression test and I got, 147, 32, 163, 0 I am really surprised at how well it runs with a dead cylinder. Well 1.75 dead cylinders.
I haven't done a compression test, but maybe I'll go rent the equipment from Autozone the next time I'm near there.

Everything is pretty much the same as when I started this thread. MPG is still good and I occasionally get above 35 so I have pretty much left well enough alone.

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Old 04-26-2014, 06:26 PM   #36
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Default Re: Rough idle and random high idle

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Everything is pretty much the same as when I started this thread. MPG is still good and I occasionally get above 35 so I have pretty much left well enough alone.
So much for that! I pulled into my spot at work two days after that post and guess what happened when I put it in park? Revved up to 2K after not doing it for almost a year! Looks like I have to swap my other TPS back on.

I also noticed some transmission issues shifting into third and hesitating/slamming into reverse the past few trips to and from work. I read about the fix for reverse and have seen mention of a TPS causing shifting issues. I'm hoping that TPS will fix that too.

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