1992 Suzuki Samurai Engine throttle issues

Tiny
AEHSSANI
  • MEMBER
  • 1992 SUZUKI SAMURAI
  • 4 CYL
  • 4WD
  • MANUAL
  • 130,000 MILES
Hi, My car has developed a peculiar problem, when I turn on my parking and or headlights, my engine's RPMs increase to about 3,500 and stay there until I turn off the lights. This occurs regardless of engine speed/gear, driving or if I am at a stand still. All the fuses are good and I don't see an obvious short anywhere in the wires. I live in the Caribbean and no one around here seems to be able to diagnose this. To make matters worse, I think the increased RPMs are contributing to an overheating problem and have led to a water pump gasket leak. What do you think about the light/throttle issue? Also, can I get away with replacing the water pump gasket since a new pump is about 150 dollars here? Thank you in advance
Friday, April 10th, 2009 AT 5:52 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi aehssani,

Thank you for the donation.

Additional air going into the intake manifold would increase the idling speed. There are 2 possibilities for this happening.

1. Idle Solenoid Control valve is receiving a signal to open allowing more air to go in.
2. Throttle is being operated by the Throttle Opener Vacumn Switching Valve. Item # 14 in diagram.
I would suspect this to be the problem. Check if the VSV is being activated when lights are turned on with engine running.


https://www.2carpros.com/forum/automotive_pictures/192750_Component92Samurai_1.jpg



Throttle Opener VSV is activated by the ECM so this could be bad news.

If the water pump gasket is leaking, replacing it would do but if the water pump is leaking, no other option but to replace it.
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Saturday, April 11th, 2009 AT 9:24 AM

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