Question about 1987 GMC S-15 Pickup

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My truck failed emissions with 125 carbon minoxide. Limit is 25.

The back clamp on the muffler is not present and there is black stuff staining the surrounding area of the tailpipe. Would having that clamp missing cause such a deadly difference in he carbon minoxide output. The limit is 25, my truck shows 125.00

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No, the emission control for Monoxide is before the muffler system, Catalytic converter is the final adjusting device.

Posted on Aug 10, 2010

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My Mitsibushi pajero 2002 deisel is revving uncontrollably when put into gear and emitting black smoke. A diagnostic test has been done and there are no faults- mechanics are at a loss. Has anyone had a...


Hi,
We have that similar problem, thick black exhaust and too much revving.
Replace everything, tuned it up, but still that problem is there. Usually that was the problem of most Diesel Pajeros. Untill, we clean up the exhaust pipe and mufflers. Cleaning by means of using liquid sosa, detergent soap, and kerosene gas. Because diesel is a rich carbon emission fuel( oil ), mostly the carbon accumulated in the exhaust system and replacing the whole system is costly.
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SECTION 309-00: Exhaust System 2003 Focus Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 01/24/2003 Exhaust System adobe.gif Printable View (214 KB) Vehicles with 2.0L Zetec-E enginee0008758.gif
Item Part Number Description 1 - Bracket 2 - Gasket 3 - Catalytic converter 4 - Bracket 5 - Gasket 6 - Front muffler 7 - Rear muffler 8 - Hanger 9 - Flexible pipe

Vehicles with 2.0L SPI enginee0010349.gif
Item Part Number Description 1 - Gasket 2 - Catalytic converter 3 - Bracket 4 - Gasket 5 - Front muffler 6 - Rear muffler 7 - Hanger 8 - Bracket 9 - Flexible pipe

Vehicles with 2.3L PZEV Enginea0072697.gif
Item Part Number Description 1 5G232 Catalytic converter 2 5K222 Mounting bracket 3 5K282 Head shield 4 9451 Gasket 5 5A262 Insulator 6 5E292 Converter and muffler assembly 7 9448 Gasket 8 5G203 Flex Pipe NOTE: The exhaust systems shown in this section are production systems.
The exhaust systems are of a two-piece construction for production and five-piece construction for service.
Catalytic Converter
The catalytic converter fitted to the Focus range resembles a small muffler. Because of the high temperatures at which the catalytic converter operates, the vehicle body areas around the catalytic converter are protected by heat shields. The catalytic converter controls three emissions; Hydro carbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx).
Catalyst deactivation due to poisoning
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Lead (Pb) in fuel can cause a severe deactivation at levels above 5 mg per liter of fuel. It is therefore essential that vehicles with catalytic converters always operate on unleaded fuel.
Zinc (Zn) and phosphorus (P) present in some oils, can cause deactivation if oil consumption is high.
The effect of sulphur is felt most if it is released from the catalytic converter as hydrogen sulphide (H2S). This has an unpleasant odor similar to rotten eggs. Changing the fuel manufacturer may help in reducing this phenomena.
To minimize H2S emissions, it is essential that the idle CO level is within specification and that the engine emission system is functioning correctly. For additional information, refer to Section 303-08A or Section 303-08B.
ani_caut.gif CAUTION: If temperatures exceeding 900°C are achieved the catalyst substrates will start to deteriorate. It is important that the cause is defined and rectified if subsequent melts are to be prevented.
Catalyst melts are normally accompanied by loss of power due to excessive back pressure. For additional information, refer to Section 303-07A or Section 303-07B.
High substrate temperatures are caused by the ignition or the fuel systems. For additional information, refer to Section 303-07A or Section 303-07B.
Misfires at high engine speed may result in an almost instantaneous melt.

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