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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 12-07-2018, 04:51 PM   #1
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How to fix high RPMs

I already checked the timing (lamp), adjusting the iacv wont help it just raises the rmps (its already all the way). What else can i do to lower the revolutions?
I dont think its the tb screw either. I heard the intake manifold has 2 ways to adjust idle. But idk maybe im missing something. Can anyone help?
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Old 12-08-2018, 06:56 PM   #2
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I already checked the timing (lamp), adjusting the iacv wont help it just raises the rmps (its already all the way). What else can i do to lower the revolutions?
I dont think its the tb screw either. I heard the intake manifold has 2 ways to adjust idle. But idk maybe im missing something. Can anyone help?
if youre talking about idle, a vacuum leak can cause a high idle

need more info
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Old 12-09-2018, 04:19 PM   #3
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Check your coolant temp sensor.
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Old Yesterday, 11:53 AM   #4
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what engine/mods are you using?
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Old Yesterday, 02:53 PM   #5
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Yeah i was referring to idle. Removed all vaccum lines except neccesary ones (booster, fpr, iacv). Ka24de just headers. How can i check the coolant temp sensor?
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Old Today, 12:34 AM   #6
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Get a can of brake cleaner and spray all around the intake and up to the maf. If the idle changes you have found your problem.

Have a great day,
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Old Today, 01:47 AM   #7
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Yeah i was referring to idle. Removed all vaccum lines except neccesary ones (booster, fpr, iacv). Ka24de just headers. How can i check the coolant temp sensor?
In the manual, take a multi meter and look at the ohms for spec.
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