Question about 1986 Chevrolet K1500

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Whats a power valve - 1986 Chevrolet K1500

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The power valve is design to add more fuel when engine vacuum drops below a certain point E.G 4.5 inhg this means the valve is closed until vacuum drop to and below the becomes open to add fuel.

Posted on May 06, 2014

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Posted on Jan 02, 2017

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Whats is Service Engine Code P1800 - VIAS Control Solenoid Valve Circuit Open


Here is the definition. Cost would depend on your area and the actual problem found after testing.

P1800 NISSAN Description When the engine is running at low or medium speed, the power valve is fully closed. Under this condition, the effective suction port length is equivalent to the total length of the intake manifold collector's suction port including the intake valve. This long suction port provides increased air intake which results in improved suction efficiency and higher torque generation.
The surge tank and one-way valve are provided. When engine is running at high speed, the Engine Control Module (ECM) sends the signal to the Variable Intake Air System (VIAS) control solenoid valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore opens the power valve to two suction passages together in the collector.
Under this condition, the effective port length is equivalent to the length of the suction port provided independently for each cylinder. This shortened port length results in enhanced engine output with reduced suction resistance under high speeds.

Read more: http://engine-codes.com/p1800_nissan.html#ixzz2JgphPIVM

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Scanned = p-0449, cleared 2x, replaced sol valve, returned


The usual problem is the vent valve.This is what usually goes bad on these with this code.The vent valve is under the rear spare tire area or by the fill pipe and gets dirt and debris inside and it malfunctions.If you have a scan tool then go into out put test and command the vent valve on and off.You should hear a click.If you don`t hear a click then check for power to the vent valve with a test light.If you have power then replace the valve.Hope this helps.Good luck.

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Hi i have 02 altima 3.5 v6 who have check engine light with code p1800 what is manufactured transmission control can anyone help me what that means?


You may want to have someone else take a look at it. The Nissan P1800 trouble code is not a transmission control problem. It is described as follows:

Trouble diagnosis name: VIAS control solenoid valve circuit.
Component Description:
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DTC detecting condition:
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•VIAS control solenoid valve

Check your vacuum hoses to make sure they are in good shape and are securely attached Aslo check the wiring harness is ok and securely attached as well. If they are, you’ll probably need to replace your VIAS. It's right next to the throttle body.

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