How to adjust idle speed (90 Camry DX I-4) - Toyota Nation Forum : Toyota Car and Truck Forums


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1st & 2nd Generation (19831986 & 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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Old 09-28-2002, 03:20 PM   #1 (permalink)
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How to adjust idle speed (90 Camry DX I-4)

How do you adjust the idle speeD?
I found a screw and a locking nut on the throttle linkage that I thought was the idle adjust. I unscrewed the lock nut and screwed the idle screw in from the back (it's a screw with a notch at the threaded end of the screw).

It didn't do anything...

What am I supposed to do?

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Old 09-28-2002, 07:56 PM   #2 (permalink)
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Re: How to adjust idle speed (90 Camry DX I-4)

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Originally Posted by adi
How do you adjust the idle speeD?
Theres a screw on top of the throttle body. Its underneath a black cap.
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Old 09-28-2002, 09:37 PM   #3 (permalink)
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Thas wicked... i didnt know you could do that...
Im considering putting it all the way down... any benefits or : from doing so?
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Old 09-29-2002, 12:15 AM   #4 (permalink)
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ummm....can't the car possibly stall then?
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Old 09-29-2002, 12:52 AM   #5 (permalink)
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The throttle body... which part of the engine is that? I'm sorry to sound like a dumbass..
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Old 09-29-2002, 07:30 AM   #6 (permalink)
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It is highlighted in blue. It says EFI on it.

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Old 09-29-2002, 11:50 AM   #7 (permalink)
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Idle speed

Dont bother putting the idle speed all the way down. The factory idle speed is set at 650 rpm for both the stick and auto cars on 3s-fe's. I'd think that's low enough as it is.
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Old 09-29-2002, 07:24 PM   #8 (permalink)
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Quote:
Originally Posted by adi
The throttle body... which part of the engine is that? I'm sorry to sound like a dumbass..
You don't know what it is and were it is and you want to mess with it? :roll:
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Old 09-29-2002, 07:25 PM   #9 (permalink)
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Quote:
Originally Posted by 91camryDX
It is highlighted in blue. It says EFI on it.
Thats the plenum. The throttle body is right before that.
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Old 09-29-2002, 07:58 PM   #10 (permalink)
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Yeah I know but the gives him the basic idea. It's located to the right of the plenum and hooks up to the air intake.
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Old 09-29-2002, 11:03 PM   #11 (permalink)
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Well I'm used to diesel engines (my main ride ride is a 1983 Mercedes turbodiesel).. so I never quite heard of a throttle body.. :p To adjust the idle speed I just adjust the mechanical linkage.

I'll find it and see if I can adjust it up a little.

The reason why I want to do that is because the engine vibrates so much at idle in gear and the engine rotates a little (about its crankshaft as the axis of rotation) when it's put in gear. I'm guessing that maybe the rubber engine mounts are bad after all these years?

Funny thing is with the A/C on the vibration is lessened.

The problem is that when I stop at a traffic light (it vibrates) and I give it a moderate amount of throttle input the engine would act as if it was going to stall but it doesn't...

However, with the A/C on (increased idle speed) the engine idles perfectly and moves off perfectly. This is what led me to try increasing the idle just by a bit.

I've replaced the fuel filter, all four glow plugs (WTH?!@# Spark Plugs I mean) with Bosch Supers correctly gap'd, and ran two bottles of Techron Concentrate... none really helped.

When the engine is cold the vibration is worse and it would stall when I let moderate amount of air in suddenly from idle.

*Edited.. sorry.. been with diesels for too long*
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Old 09-30-2002, 12:07 AM   #12 (permalink)
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im guessing its the engine and tranny just acting its own way. im guessing that with low idle speeds on your car....the nature of the engine and tranny is to vibrate. on my 4.6L vortec blazer it does the same thing....when in park or nuetral...at certain rpm level the truck will vibrate like a hawaiian back rub. (1800 rpm...might feel nothing....2010 it might vibrate alot) it could be the tranny wearing out but most likely its just the physics of the engine and tranny. so taking that in mind...i dont think changing the idle speed will help that much if at all.

im not the biggest car guru so dont expect anything i say to be very right.
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Old 09-30-2002, 10:07 AM   #13 (permalink)
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Quote:
Originally Posted by adi
Well I'm used to diesel engines (my main ride ride is a 1983 Mercedes turbodiesel).. so I never quite heard of a throttle body..
Yeah diesel's don't have throttle bodies. I won't go into how they work since I doubt anyone on here has a turbo diesel Camry.

Anyways i'll post up a pic later on of the throttle body on a gen 2 Camry.
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Old 09-30-2002, 11:54 AM   #14 (permalink)
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Throttle body:



Idle adjustment screw:

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Old 09-30-2002, 01:33 PM   #15 (permalink)
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Wow that's awesome! Thanks a lot for the help and the pictures especially..

I hope this fixes it... I'll give it a shot tomorrow I think and I'll let you all know if it smoothes things out..
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