Question about 1994 Toyota Pickup

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94 Toyota 2.4 engine idles fast. when warms up it starts surging

Can remove oil cap or vacuum hose engine will idle down and run smooth. When it is surging the exhaust burns my eyes. When I remove a vacuum hose the exhaust is fine.

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  • butc2 Jan 05, 2009

    Thanks

    Mike,



    I have already cleaned the air intake & replaced the pcv. also checked the compression, tried to adjust the throttle body, tried a new oxygen sensor. If you have any more ideas they would be greatly appreciated.

  • Anonymous Mar 28, 2014

    surging at idle

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Sounds like an Idle air control valve or a positive crankcase ventalation valve(or pcv valve). use some intake cleaner in the air intake and take the pcv valve out and shake it it should rattle and move freely. mike

Posted on Jan 05, 2009

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My Samurai starts and runs fine but the idle surges up and down, up and down after it warms up. How can I get a smooth idle?


This is often the result of a vacuum leak. For a car of your vintage, a vacuum leak is quite likely. Check all the small hoses under the hood, and replace any with cracks.

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ok what is surge, that it really is idle controls bad or out of comtrol
1: idle controls bad. (isc dead?)
2: or engine is running way too lean, and ISC cant keep a grip on idle.

easy huh?
and #3 misfiring so bad the idle controls fail.
are all fuses good?
is the CEL lamp glowing , then goes out running engine.
no , the scan it. or do the flash DTC codes trick.

a good tech ,first finds out if the engine holds closed loop status
hot. at idle, if not, he fixes that first.
as he/she knows that idle is the last thing to work right, in EFI.

one other way to get surge is air leaks (aka. vacuum leaks)
if the engine (unsaid option) is MAP based, it will race fast
with any vacuum leak, and it dont take much of a leak
to make the ISC idle controller go nuts.

so repost , hot/cold both questions
and actual RPM numbers. we need numbers
is the dash Tachometer missing. ????
and what engines in car.

all lean engines surge.
all ISC systems can surge if out of control , not all do this. just 1/2
if the ISC surges, it means its trying hard to gain back control.
this is called a software servo loop.
The ECU is programmed to hold rpm near say 800 RPM hot.
and is very digressive in that role.
I have a 91 car that will surge, with any vacuum leaks.
(by design) depends on which engine.

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You either have a vacuum leak or the Idle Air Control Valve (IAC) has become dirty and stuck. Read this

http://www.justanswer.com/toyota/1ktck-92-93-toyota-camry-fast-idle-turn-down-oem.html

One other possibility for a high idle if you have A/C fitted is that the A/C idle-up valve has failed in the high-idle state. If this needs testing, do so when it is hot.

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Unless your throttle linkage is hung up, it is vacuum leak.

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Remove the vacuum lines on the bottom front of the throttle body with the engine off. Check each hose connection with a nail; small screwdriver or a small drill bit. Make sure they are not clogged. If they are clean them out carefully. If they are not clogged, then check to make sure the vacuum lines aren't obstructed. I refer to your idling up and down as hunting. Reconnect the vacuum lines and start the engine. If it idles smoothly, your found your problem. Good luck.

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