Useless Emission Parts Question?

ALEX GATLIN

MEMBER
1994 FORD MUSTANG
5.0L
V8
2WD
MANUAL
105,500 MILES

Hi guys. Okay, this is a problem entirely of my own making. A little while back my catalytic converters became plugged. Living in California and not wanting to pay the outrageous prices for "Carb compliant" catalytic converters, and since I couldn't slip it by any retailer to send me "Everybody else" compliant cats, not even to an Oregon P.O. Box (I tried), I went ahead and removed the catalytic converters and pre-catalytic converters, replaced with straight pipe, welded, and sold old catalytic converters for a few bucks. I also decided to remove tube running to mid pipes from smog pump, all hoses and check valves from smog pump, remove metal tube from exhaust manifold to EGR valve, weld shut nut from said tube both at EGR valve and exhaust manifold, rendering them air/exhaust tight, and to do the same on the funny tube that goes to each head(I assume into exhaust ports) from the smog/air pump. Fine because My car is a classic and very nice and I am going to keep it. Problem is, now I want to sell it to a friend as I am buying a 2015 convertible 5.0L GT. So, I am having to make my 1994 "smog-able" again so my friend can buy it. I have most of the parts, but I will have to buy a couple of them, and I am not even sure what their nomenclature is. Do you guys have an exploded diagram with parts nomenclature for this vehicle by chance? It is going to be a pain tracking this down, but it sure would be easier if I knew what to call the parts. Thank you. Here is a pix of the beast.

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4 Replies

ALEX GATLIN

MEMBER
42 POSTS

New 2015 Mustang GT.

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Wednesday, January 4th, 2023 AT 2:07 AM

KEN L

MASTER CERTIFIED MECHANIC
47,702 POSTS

That is a nice car, here is the information we have on the emission systems for your car, let me know if you need anything else to get the car fixed.

PURPOSE
The California Air Resources Board (ARB) began regulation of On-Board Diagnostics (OBD) for vehicles sold in California beginning with the 1988 model year. The first phase, OBD I, required monitoring of the fuel metering system, Exhaust Gas Recirculation (EGR) System, and additional emission related components. The Malfunction Indicator Lamp (MIL) was required to light and alert the driver of the malfunction and the need for service of the emission control system. The MIL must be labeled "CHECK ENGINE" or "SERVICE ENGINE SOON". Associated with the MIL was a fault code or Diagnostic Trouble Code (DTC) identifying the specific area of the fault.

The OBD system was proposed by the California ARB to improve air quality by identifying vehicles exceeding emission standards. Passage of the federal Clean Air Act Amendments in 1990 has also promoted the Environmental Protection Agency (EPA) To develop on board diagnostic requirements.

The emission system controls tailpipe emissions, hydrocarbons produced by evaporating fuel, and combustion gases that escape through the crankcase into the atmosphere. Effective control of vehicle emissions is necessary to reduce the automobile's impact on environmental pollution. The emission system has components that are monitored and components that are not monitored.

MONITORED COMPONENTS
Exhaust Gas Recirculation (EGR) System Monitor
- The EGR System Monitor tests the integrity of the circuit, components and hoses that make up the EGR system and determines EGR flow rate errors.
Heated Oxygen Sensor (HO2S) Monitor
- The H02S System monitors upstream exhaust gases to fine tune the air/fuel ratio.
Fuel System Monitor
- The fuel control system uses the adaptive fuel table to compensate for normal variability of the fuel system components caused by wear or aging.

COMPONENTS NOT MONITORED
Fill Pipe Restrictor
- To prevent the larger diameter fuel nozzles used for leaded fuels from entering the fill pipe, a fill pipe restrictor is installed.
Positive Crankcase Ventilation (PCV).
- The PCV system prevents blow-by gases from entering the atmosphere by recirculating the gases back into the intake system.
Evaporative Emission System (EVAP)
- The EVAP System prevents fuel vapor build-up in the sealed fuel tank.
Secondary Air Injection (AIR) System
- The AIR System adds air to the already burning exhaust gases, oxidizing CO and HC's, and creating additional heat which accelerates the catalytic converter operation.
Catalytic Converter
- The catalytic converter effectively changes harmful pollutants into carbon dioxide and water.