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Juan Crespo
Juan Crespo, Tech Trainer
Category: Toyota
Satisfied Customers: 1497
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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I have a 1994 Toyota 4Runner 3vze 5speed w/ 310,000 miles.

Customer Question

I have a 1994 Toyota 4Runner 3vze 5speed w/ 310,000 miles. The cruise control is starting to surge (seems worse in colder weather) and once in a blue moon, it will get very fusy about idling esp when hot outside.
could these two things be my egr vacuum controller and idle air control valvue.?
Submitted: 4 months ago.
Category: Toyota
Customer: replied 4 months ago.
Customer: replied 4 months ago.
lets assume its not a vacuum leak. i changed timing belt (kit), water, starter, fan clutch, driveline clutch and master/slave clutch cylinders all around 290,000 miles (+/- 10,000 miles). throttle position tests good as does my airflow meter (duh). The computer doesn't have any stored error codes, Eg. no codes displayed after jumping diagnostic terminals T & E.
Expert:  Juan Crespo replied 4 months ago.

Hi there.

The idle air control valve regulates idle speed, not idle condition; as such, I would not consider it a problem at this time.

A way to determine if the EGR or any component or gasket is leaking and causing erratic idle is by spraying choke cleaner on and around it while the condition is present - if idle returns to normal, then you've found the culprit.

Regarding the cruise control surging, the most probable cause is either the magnetic clutch or the motor inside the actuator beginning to fail. As these are not serviced individually, the repair would require actuator replacement.

Customer: replied 4 months ago.
funny you say that because i have serviced the motor inside my actuator. did that year or so ago. my magnetic interloc is no longer magnetic yet physical push button setup under my dash right on petal lever.i've done the EGR vacuum test and as expected adding vacuum during idle stalls the motor.
Customer: replied 4 months ago.
I'm not sure it is wise to spray choke cleaner while driving my 4runner w/ cruise control activated/operating. noting physical logistics... i'd probably get myself runned over at 25m/hr
Expert:  Juan Crespo replied 4 months ago.

Looks like you misunderstood my post; I didn't suggest for you to do something while driving the truck. Also, I did suggest spraying choke cleaner on the engine while it was idling, not doing any kind of EGR vacuum test.

I’m sorry, but seeing that we are not communicating, I’ll opt out so others may try. Please do not reply until another expert responds or the site will cycle this request back to me.

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