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Old 08-27-2009, 02:02 PM   #1
haseeb007
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Default Help: High Idle Speed after Cleaning

I can't seem to find anything on this. I cleaned the throttle body with Motomaster TB cleaner. I was careful to replace the intake tubing , tighten the clamp and made sure that no vacuum hoses were removed. Now the engine idles at around 1,200 initially and might slowly drop to 900 after a few minutes. Before cleaning, the engine would idle smoothly around 600. Not sure whats happening. Any ideas?

Its a 2003 v8 4runner Limited with 76,000 miles on it.
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Old 08-27-2009, 03:42 PM   #2
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Normally an air leak will cause this or the TB might be stuck slightly open.

Have you driven around with it for a while and it still does it?
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Old 08-27-2009, 03:49 PM   #3
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I did the cleaning earlier today and drove around for a couple of miles to test out the increased power. The power indeed got better but the high idle speed is making me nervous. Do you think it will return to normal after a few days of driving?
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Old 08-27-2009, 03:52 PM   #4
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Just see, I can't recall if I had similar results. If you have done a couple of days of drivign and it still is high it might be worthwhile to look into it further.

With the all the electronics it does strange things sometimes.
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Old 08-27-2009, 04:59 PM   #5
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You might try pulling the 20amp EFI fuse under the hood for a few minutes. That'll reset it and erase the "learning" it's done over the years.

With a fresh, clean TB maybe it needs a good ctrl/alt/del

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Old 08-27-2009, 06:03 PM   #6
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I've never had my MAF cleaned. Is it really worth it/necessary? Seems like people often have problems after doing it.
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Old 08-27-2009, 08:15 PM   #7
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I have had good luck after cleaning my MAF & TB. My mileage got a nice bump and truck felt more responsive.
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Old 08-27-2009, 10:03 PM   #8
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Just make sure you use MAF cleaner not carburator cleaner. There is a difference.
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Old 08-28-2009, 01:01 AM   #9
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Ok, thanks for the advice guys. I better go look for the writeup. For some reason my trucks not feeling too good in the past few weeks. Feels sluggish and going thru the gas too quickly.
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Old 08-28-2009, 05:40 AM   #10
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YES do it! i posted not to long ago about cleaning my air system. I did a K&N drop in airfilter and if yall think its a good idea im thinking of doing the VOLANT CAI system with a dry airfilter. But back to you id deffently clean the TB and MAF. make sure you use the right stuff and let things like the MAF dry out before slapping it back in.

Also hasbee, when cleaning the TB did you just spray into the TB? I put a thik layer of the TB cleaner on a tuff towel and used my finger around and behind the butterfly valvue and got as far in as i could. When you do it did you make sure you did not leave any residue behind and did a full clean?

Id also suggest once you did all this cleaning up any residue and makeing sure the MAF self dryed (dont whipe it) to let your engine run idle for about 10 min make sure everthing drys out and runs correctly.
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Old 08-28-2009, 07:21 AM   #11
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Quote:
Originally Posted by expat View Post
I've never had my MAF cleaned. Is it really worth it/necessary? Seems like people often have problems after doing it.
I didn't notice any power/mileage difference, but both my TB and MAF were noticeably dirty when I cleaned them at the 30k PM.
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Old 08-28-2009, 12:28 PM   #12
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Is there a thread on "how to" or is it a simple spray and brush with toothbrush ?
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Old 08-28-2009, 01:05 PM   #13
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I reset the computer by removing the 20 AMP EFI fuse for a few minutes like Chris suggested and voila! I guess it did need a ctrl+alt+del after the cleaning. The computer couldn't handle the easier breathing. It smoothly idles now at 750 in neutral and 600 when in drive. Very similar to the chart on page 5 of this document:

http://www.autoshop101.com/forms/h26.pdf

I cleaned the MAF sensor and the throttle body and noticed quite a change in engine responsiveness and power. Its perky, lot smoother and I definitely feel the increased power. Hopefully, I notice an mpg difference aswell! Definitely worth the 20-30 minute DIY maintenance and highly recommended.

Steps outlined in the link below are pretty good to follow to do this:
http://www.toyota120.com/html/cleani...hrottle_b.html
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Old 08-28-2009, 02:17 PM   #14
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We actually have the tech write ups in the forum SW now
http://www.toyota120.com/forum/showthread.php?t=3373

The old static pages are still there for folks that might have linked to it in the past.

Glad it worked out for you. The first time I cleaned everything the engine did seem much more peppy. It also was better on gas. Obviously it works well if the air filter is swapped at the same time as well.
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Old 08-28-2009, 07:36 PM   #15
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Quote:
Originally Posted by bulldog View Post
Obviously it works well if the air filter is swapped at the same time as well.
Hope this question is pertinent to this thread because you brought up the air filter, how often are you guys changing them out in consideration to the amount of time off road in dusty conditions (I know all relative). I checked mine the other day and found mud on it that had got in through the weep hole in the bottom, not much but it is also very dusty and would this be a way to gauge how dirty the MAF may be and also need some attention?
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Old 08-28-2009, 07:39 PM   #16
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I replace mine after pretty much every dusty trip. I use to blow them out with compressed air but was never very happy with the result.
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Old 08-29-2009, 08:32 AM   #17
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I clean mine with compressed air or CO2 after trips. This gives a good sense of how dirty they get as well, and I replace them when they are dirty. This is typically after 3-4 trips, pending on the terrain and distance of the offraod portion.
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Old 08-29-2009, 11:21 AM   #18
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I cleaned my MAF sensor and rebooted the system as well but didn't get any difference in performance or mileage. I only have 25k on the truck though.

Since this thread relates to MAF maintenence, has anybody tried the Jet MAF as a replacement module in the V8? I could only find 2 reviews from 4th gen 4runner users and one said mileage went up 1-2 MPG and the other stated better performance but no change in MPG. They may have had dirty stock MAF as well. Not much real use info on this product from my looking around...



JET PERFORMANCE POWR-FLO MASS AIR SENSOR -- This Mass Air Sensor Replaces Your Vehicle's Restrictive Stock Equipment, It Significantly Improves Horsepower, Torque And Mileage, Increases Airflow By Up To 45%, Compatible With Other Aftermarket Computer Upgrades, Cold Air Intake, TBI Spacer, Free Flow Exhaust System, And Other Intake And Exhaust Parts, Easy Installation, With Jet's Limited 30-Day Return Policy
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Old 08-29-2009, 01:38 PM   #19
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That aftermarkt MAF looks interesting, but at $300 a bit pricey. Not sure how much it will help the V8 though as it is not a high revving engine per se, especially the pre VVTi V8s.
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Old 08-29-2009, 03:52 PM   #20
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The price is $135 at Autoanything. Less than buying the OEM part.
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