89 3sfe idle drop with A/C on - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 1st & 2nd Gen (1983-1986) & (1987-1991) Toyota Camry Discussion for years 1983-1986 & 1987-1991. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 8 Old 06-02-2019, 05:51 PM Thread Starter
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89 3sfe idle drop with A/C on

When I turn the AC on the idle drops to about 500 from 1000. Previous owner said he idled it up to compensate for the drop when running ac. Now the idle surges along with dropping when the AC is on. Any ideas on how to fix?
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post #2 of 8 Old 06-02-2019, 05:54 PM
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The idle up solenoid may have gone bad it's bolted to the firewall near the RH strut tower. I can post pictures later if you can't find it.

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post #3 of 8 Old 06-02-2019, 08:51 PM Thread Starter
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Originally Posted by 71Corolla View Post
The idle up solenoid may have gone bad it's bolted to the firewall near the RH strut tower. I can post pictures later if you can't find it.
That's separate from the idle air control valve?
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post #4 of 8 Old 06-02-2019, 09:33 PM
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Originally Posted by Yaboy_chun View Post
That's separate from the idle air control valve?
Yes here's the two components involved.

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post #5 of 8 Old 06-02-2019, 11:19 PM Thread Starter
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That's separate from the idle air control valve?
Yes here's the two components involved.

Aye your Camry is the same color as mine but your engine bay looks alot cleaner lol

Thanks for the input I'll try to see about finding a new one
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post #6 of 8 Old 06-02-2019, 11:30 PM
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Aye your Camry is the same color as mine but your engine bay looks alot cleaner lol

Thanks for the input I'll try to see about finding a new one
The valve bolted to the intake is what usually goes bad, all it does is let in more air so the ECU increases the engine speed. Don't know why the IACV can't do this maybe it can't let in enough air.

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post #7 of 8 Old 06-03-2019, 11:10 AM
3s-gte in a Camry?!?
 
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Originally Posted by 71Corolla View Post
The valve bolted to the intake is what usually goes bad, all it does is let in more air so the ECU increases the engine speed. Don't know why the IACV can't do this maybe it can't let in enough air.
My experience was the opposite. The valve on the firewall with the electrical plug often goes bad. It probably has gone open circuit (easy to test with a multimeter). Hopefully you can find a replacement at the junkyard. They are probably available in parts stores too - it is a common fault.

The valve on the manifold (opposite end from throttle body) is actuated by the electrical VSV on the firewall and is adjustable. Set it so the RPMs bump up slightly (700-900) in gear when the AC turns on. Idle with AC off should be around 700 and should not have been adjusted by the previous owner (supposed to be electronically controlled).

-Charlie
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post #8 of 8 Old 06-03-2019, 01:01 PM
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Originally Posted by white90dx View Post
My experience was the opposite.
I suspect it's climate related here the air valve gets gunked up and covered in salt.

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