Vacuum leak??
10-20-2012, 09:03 AM
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Vacuum leak??
After my truck warms up at idle Rpms jump up an down constantly I can get it stop by pressing the gas peddle but soon as I touch the brake peddle Rpms go up an down constantly again I changed the o2 with a denso unit already I had a code 25 which is why I changed it with no luck
10-20-2012, 11:04 AM
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Hmm i have the same issue, but mine's after its been running for a while. I thought it was because my efan has about killed my alt so when i press the brake pedal, or use turn signals, the rpms flucuate. I thought because i have led's that something in my electrical system doesnt agree with that. Im interested to see if anyone has any insight in this.
10-20-2012, 03:59 PM
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Ok I looked around again an found 2 lines coming from the passenger side of intake both had screws in them when running an only 1 line had a suction on it the other was dead no clue where they go both looked cut I have pics on my phone don't kno if I can post them on here tho
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10-20-2012, 04:37 PM
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Warm-up idle speed is determined by the temperature of the coolant. If its low, the sensor cant get an accurate reading, so it jumps around. Even once its warm, if it cant get an accurate reading, the ECU stays in open loop.
What is the idle rpm when its warmed-up? What rpms does it jump around to?
It also sounds like your timing and idle RPM are incorrectly set. On all 3 of my 22res, and various other 22res and 3vzes I have worked on, when the idle was set to 1001-1150 rpm, and you pressed on the brake, it would surge down and up. It was fixed by setting the timing and idle speed below 1000 rpm.
What is the idle rpm when its warmed-up? What rpms does it jump around to?
It also sounds like your timing and idle RPM are incorrectly set. On all 3 of my 22res, and various other 22res and 3vzes I have worked on, when the idle was set to 1001-1150 rpm, and you pressed on the brake, it would surge down and up. It was fixed by setting the timing and idle speed below 1000 rpm.
10-21-2012, 05:25 AM
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okl well in my case, my warm idle is around 1050-1100, because i advanced the timing. However, when it does that jumoing around, it idles at around 500, which is why i thought it was something electrical.
10-21-2012, 05:52 AM
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Yea post one up, if you have the same issue, great if not looks like a gotta make a new thread...Just a thought did you check your brake boosted vacuum hose?
10-21-2012, 09:48 AM
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It doesn't affect driving or nothing but its aggravating it normally doesn't stop till I tap the gas I jus went around the block but I'm clueless lol my first toyota so I don't kno crap about them
10-21-2012, 09:52 AM
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Mine does it when im stopped, on the brakes or with the turn signals on. But only after its warmed up, and the normal idle is around 1000(needs to go down) buttt however when i have this issue, the idle is around 500.
