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Question
THE OBD IS READING IDLE CONTROL SPEED CIRCUIT MALFUNCTION AND
IT IDLES UP AND DOWN CHANGED TPS SENSOR AND EGR VALVE BUT IT
HAS NO CATALYTIC CONVERTER SO I NEED ADVICE ON WHAT ELSE TO DO
Hello,
I do not understand why people remove the cat. In the 70's we did remove them to run leaded gas. At that time vehicles were not cumputer controlled.
For the optimum fuel efficiency and power, you need all items for the emission system.
You are going to have idle problems as well as others.
When all components are functioning correctly, the computer goes into closed loop. You have no idle problems, your timing is perfect and you get the best mileage and power.
When a component fails or is not connected, the computer runs in open loop, giving you problems
You are asking for an adjustment that cannot be made in its present condition missing the catalytic converter. Your Egr is not functioning as well as the O2 sensor, map sensor and more.
If you get caught without it, you would not go out of your way to advertise it. You are looling at a $50,000 fine as well as the person that removed it.
It is counter productive to play the silly games not having a cat. If you want this car to run a peak efficiency, and idle right, put the converter tube and pipe back on.
My purpose here is not to lecture, but give you the information to realize that the wngine is designed to run with all emission components.
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Rob Painter
Expertise
Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?
Experience
Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.
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