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Whats causing Echeck(oh)failure-high emissions/93 Ford F-150 4.9 L>

Changed catalytic converter

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  • Ford Master
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O2 sensors, bad vacuum lines, Clean the throttle body and mass air flow sensor.

Posted on Dec 06, 2014

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1 Answer

What causes the check engine light to come on?


The check engine light is triggered by failures in the emission control system. Fire under the vehicle indicate possible problem with overheating the Catalyst due to excess fuel getting to the catalytic converter. Have the codes read and get the diagnosis done. It will get worse unless it is fixed.

May 29, 2015 | 1999 Ford Explorer

2 Answers

I was told my three rear ignition coils needed to be replaced. I replaced them to save money , my emissions light turned off and than turned back. Originally the car would idle high and shake when in


No the cat converter can not unless it is plugged but the cylinder misfire can cause the cat to go bad. a engine idling high means a vacuum leak and misfire.

May 14, 2014 | 2006 Ford Fusion

1 Answer

Failed smog high emissions chevy astro van would tune up fix the problem


You may need a new catalytic converter, I had two cars last year and it fixed them. Oh change the plug too.

Feb 28, 2014 | Toyota Cars & Trucks

1 Answer

I have a 95 grand jeep cherokee and i have failed 2 emission they say it is a the NOx is to high what would cause that?


What causes High NOX Emissions


Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?
Among the potential causes of non-compliant NOx readings are:
Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Case Study

Oct 09, 2012 | Jeep Cars & Trucks

1 Answer

1993 Gmc Jimmy starts and sounds ok but began to buck and jumpl Changed plougs and wires with no change. Catylitic converter is making noise at the outlet


looks that your catalytic converter is broken.Before you do anything take it to a qualified mechanic and request for emission test to see whether you do have high emission due to lambda sensor failure or cat. also you can check from your exhaust end if your emissions smell like rotten eggs.If so change cat.

Sep 10, 2012 | 1993 GMC Jimmy

1 Answer

2003 ford focus catalytic converter location


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
Sulphur (S) in the fuel can cause deactivation of the catalyst.
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.

2010&c18=modelyear&c20=n720709&c35=wsm%2cexhaust%20system%2cs3y%2c309-00%2cdescription%20and%20operation&s=1366x768&c=32&j=1.3&v=y&k=y&bw=995&bh=405&ct=lan&hp=n&[aqe]

Mar 07, 2011 | 2003 Ford Focus

1 Answer

1989 f150 302 V8 fuel injected emissions problem. Installed new engine from Ford, blew SKY HIGH on low and high idle emissions. Emission numbers were 10-20x max legal limit (over 3000). Replaced the...


the O2 sensor works on one volt .5 is around the running voltage, i would refit the air hose as it will run the converter hotter at idle.

Apr 26, 2017 | 1989 Ford F 150

3 Answers

Failed emissions test


Hi Don,

First, thank you for asking me for my input on this. It just so happens, that I used to own a Ford ranger that had the same engine as yours. It was a 1990, but there are few changes to these model years.

Anyway, there is only one reason that your HC levels would be high. Your engine has WAY too much unburned fuel in the exhaust. The same reason applies to high CO levels. Too much fuel and/or not enough air.

Below is a link that you may find very helpful. It explains exactly what we are talking about here and also lists some of the possible causes.

EMISSIONS ANALYSIS

Incidently, when I had the same emissions failure on my truck, replacing the air filter and replacing a failed MAP sensor fixed it. - I did NOT have to replace the catalytic converter. If the numbers are as high as you listed above, you will only destroy a new converter anyway because there is obviously not enough oxygen in your exhaust system for the catalyst to function properly. Those numbers are nearly DOUBLE the allowable maximum. If the engine is running correctly and the catalyst is good, your numbers will be WAY BELOW those maximum numbers.

Please understand that I am NOT telling you to replace your MAP sensor without proper diagnosis. There are many possible causes here. Please click the link above and read the article. It will help you to understand what is going on here.

Jun 03, 2009 | 1989 Ford Ranger

1 Answer

Emmisions?


catalytic converter most likely

Jul 30, 2008 | 1993 Ford Ranger SuperCab

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