No vacuum at Swirl Valve Control Solenoid Valve

[Cliffo]

Hi All,

Got a '97 Hardbody D21; 4 cyl; 5-spd King Cab; orig owner; re-man'd motor; starts and idles just fine.

Problem:

P1130

No vacuum at Swirl Valve Control Solenoid Valve("C" nipple on solenoid to power actuator which tests good w/the Mity Vac).

I have a FSM on pdf and have gone through the test procedures w/o any success on why no vacuum to the brown solenoid to close the butterflies in the intake manifold to pass smog.

What I've tested: 12v @ swirl harness; all vacuum hoses are clear/connected correctly; steel tube "gallery" is clear; leak down test on vacuum tank; applied a hard 12v from a battery to the terminals of the brown solenoid & solenoid clicks(don't know about the current flow thru the solenoid(suspect?); CKP sensor is good; continuity test from ECU to Terminal 2 on solenoid harness is good; one way check valves are good.

Replaced: vacuum check switch; brown swirl valve solenoid

Still getting the P1130 code & swirl valves are still down under idle conditions as verified by the gold indicator rod on the valve assembly when looked at with my insp mirror. Truck also smokes when idling.

This is the last thing to fix before I can smog it and actually start driving it again!

Can anyone PLEEZ help?!

Thanks in Advance,

Cliff

[Rev_D21]

Hmm, interesting. I don't see why the smoke at idle having anything to do with the SCV. Without vacuum at the valve the butterflies remain open. The SCV is meant to increase intake air velocity at cruise. Under acceleration the valve should open the butterflies. Lots of people disable the system to get more airflow at all times. If you have vacuum and power at the solenoid then you are lacking a ground signal from the ECM to operate the system, that's my educated guess without seeing things first hand.

[Cliffo]

Thank You for the reply !

This problem with the P1130 has been a nightmare !

I have power(12v; battery) to the terminal pins of the solenoid harness. But zero vacuum to close the butterflies.

I also forgot to mention that there is 4.82v(while at idle) to the harness to the vaccum check switch. The fsm spec is 4.8vdc.

My understanding from reading the manual a bunch of times is that there is supposed to be vacuum at the brown solenoid at idle speed to the power actuator to close the butterflies and to create a swirl in the combustion chamber. This will reduce emissions and improve running conditions(that's pretty much what the manual says about P1130).

Since the butterflies are open. The air intake velocity is not increased. Thereby allowing the extra exhaust out the tail pipe. So hence the MIL & P1130 code.

Rpm above idle speed(I think the manual says above 3.6k rpms) will cut the vacuum to the swirl valve control solenoid valve(the brown one) and open the butterflies to allow full intake of air.

I'm at a loss here. I've tested everything per the FSM & still P1130 code lives on my dashboard and the exhaust continues to fill my garage and it will not pass a smog check here in CA. That's for sure !

I fear that a repair garage will be maybe more than what I'd like to shell out and I'm no cheap skate. But what's even worse...What a dealer would charge me to do this repair.

Would the TPS or MAP sensors be a possible culprit? Even without those. Odes coming up? These are original components with 230,000 miles on them.

Thank You again for ANY help that is offered.

[smith19]

It took me a while to realize the problem with his swirl valve. I know this an old post but for future readers here goes. If you look at the solenoid with the 2 nipples that are close together on the left and the 1 nipple on the right. Nissan labels them as (from left to right) B, A. B provides the vacuum from intake. A- goes to valve on back of engine. C- is the one by itself- going back onto vacuum rail. His vacuum lines are mixed up and he was trying to get vacuum out of a closed port. When energized no vacuum comes out of port C. It comes out of port B.

[smith19]

Sorry, got it wrong. Vacuum from "A" goes to actuator and at idle, this is the one to check for vacuum. Left to right -2 nipples closes to each other - "B" "A" and then "C" on the right end. "A" goes to actuator on back of engine- check this one for vacuum.