Hi

I'm working in a auto FD 93, and want to know if i can eliminate EGR and ACV to simplify a little bit. And if i eliminate this, did i receive some error code from ecu, or engine light, etc? What's the best approach to do this right?

Best Regards

 

If your car doesn't have an electrical connector on the egr, you can block if off with no ill effect. If it has a connector it will throw a code.
Disable EGR
Why do you want to eliminate the ACV? That controls your idle. Did you mean AWS?

 

Hi

I think that ACV don't control the idle, i think is the ISV that control that. I eliminate the AWS to.

regards

 

ACV has nothing to do with idle, it is emissions.

If you want to eliminate the smog pump and ACV, then you are better off actually doing a simplified sequential vacuum routing.

You should install an idler to protect the engine bearings Pulleys & Belts (93+ RX-7)

You will need to install 330ohm resistors in each of the connectors so that the ECU does not throw error codes. Really the best this to do is install a PFC with our Automatic PFC adapter, then you can do whatever you want to the car, just like the manual trans cars, no resistors or error codes and the ability to tune the car. Banzai Automatic ECU Adapter (93-95 RX-7)

 

Hi

If i eliminate the AWS, did i have to install a resistor in the connector?

Regards
Carlos Gama

 

Some people refer to it as the air control valve or idle air control valve. Its the same thing. Mazda calls it BAC as well. The AWS (accelerated warmup) can be disabled by disconnecting the vacuum hose from the actuator on the intake manifold, and plugging the nipple on the solenoid. You also want to cap the hose that went to the inlet elbow. If you leave the actual solenoid plugged in it will not throw a code.

 

Ok, i understand. I'm asking because i remove the AWS valve from the upper manifold, and plug the nipple in the inlet elbow, but don't connect the AWS harness connector to anything, i already have assembly the upper manifold and want know if leave the connector like i did, it have any negative influence in performance of engine or the ecu only throw error codes but with not influence in performance of engine.

Regards

 

People have claimed to not have issues with just unplugging the AWS (Accelerated Warm-Up System) without a CEL, it may just be a stored code. Easy way to check is jumper the diagnostics box.

The ACV is specifically the Air Control Valve on all generations



The BAC is Bypass Air Control for the FC, the similar item for the FD is the ISC Idle Speed Control (FSM F-81)

 

hi
can you please advise, if i delete ACV and leave the smog pump, can i make the smog pump work all the times by rerouting? many thanks

 

The acv does not control the air pump and the air pump does not control the acv. They do not rely on each other for operation.

 

Thanks, so any other parts can be romoved too, apart solenoids?

 

On the ’93 FD (OBD-I), EGR and ACV can be removed if done correctly.
The ECU doesn’t monitor EGR flow like OBD-II, so MIL isn’t automatically triggered.
Solenoid circuits must be terminated with proper resistive loads to avoid open-circuit faults.
ACV vacuum lines must be capped to prevent turbo reversion or oscillation.
Use thick CNC stainless block-off plates on the UIM and exhaust runner to prevent warping.
Thin plates distort under repeated thermal cycles, causing leaks.
I’ve used a SuncentAuto plate in testing; tolerances held under heat.
Alignment and gasket seating are more critical than brand.
After deletion, verify AFR