Question about 1992 Buick Century

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Mechanic friend of mine says that the part that regulates the fuel to air ratio needs to be replaced but i dont know what its called

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That could mean a few sensors, O2 sensor is for fuel trim as is the IAC, and the fuel regulator, a vacumm leak, EGR, your best bet is to have the computor read, just guessing is going to cost you a lot of money. what does the spark plugs look like (color)

Posted on May 26, 2011

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The oxygen sensor and the mass air flow sensor both control fuel to air ratio..

Posted on May 26, 2011

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Well, the problem is this..... There are many sensors that feed information to the ECU (Engine Control Unit) but here are the normal problems that effect the Air/Fuel Ratio with the GM Products but your Mechanic Friend may be wrong and would be more beneficial to know what exactly it is doing

a. Mass Air Flow Sensor
b. Air Temperature
c. Idle Air Control Valve

other common problems with this model include
Leaking upper intake
Leaking Vacuum Hose or a Vacuum leak in a hose

the list goes on and on so until I had more information, I do not know what else to offer at this time.


Posted on May 26, 2011

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How fixed p 1148 nissan armada 2008

It may be a faulty oxygen sensor.
For Models 2005 and up:
- Faulty Air Fuel Ratio Sensor 1 Bank 1
- Air Fuel Ratio Sensor 1 Bank 1 circuit is open or shorted
- Air Fuel Ratio Sensor 1 Bank 1 circuit electrical connection

Before you rush off to buy replacement parts it's worth giving a mobile mechanic a call. Those guys are usually very good and far cheaper than a dealership. And a second opinion is worth paying for.
P1148 and P0031 Problem

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89 dodge ram truck 2500 2wd code reader says 4 codes dont know what they mean p1509, p1298, p0118 andp0113

P1509 Dodge - Leak Detection Pump Switch or Mechanical Fault

P1298 Dodge - Air/Fuel Ratio Lean Under Wide Open Throttle Condition
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Dec 16, 2013 | Cars & Trucks

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Is the ECU of the Lexus 600 hl capable of adjusting the air/fuel ratio when using better fuel? Or are the air/fuel ratio's programmed as a fixed ratio? And therefore better fuel will not lead to i

There are different octane levels of fuel & different
manufactures use different additives,some of which are
required seasonally by federal & state regulations.

You can study the various fuel ratings,there is more
to it then just octane but there is no such thing a
better fuel.

You use what is recommended in your owners manual
& may be on a sticker on the fuel door

The O2 Sensors report oxygen content in the exhaust
converter & that is a main component to adjusting fuel
trim thus the ratios you refer to. The PCM,ECM,ECU etc
won't have a way to know the fuel chemistry

There are hundreds of somewhat fixed parameters in
a vehicles computer & it does try for a ratio on the air
fuel,but that is constantly moving as you have different
engine load as you drive.

The day you drive off the dealers lot with a new car
is is all down hill,no way to improve efficiency because
the engine wears & piston & valve carbon up etc.

Doing any excessive amount of preventative maintenance
over the years is all you can do.

Full Synthetic Oil -changed no more than every4000 miles
New Spark Plugs--every three years (No such thing as a Tune-Up
they left 25 years ago)
No vacuum Leaks
PCV Valve -never needs to be replaced, ever --clean it if you want
You can make you list as long as you want

You need to be working on all vehicles 3 or 4 times a year
You don't wait for break down issues you need to be proactive
& continually learning

If you want anything done correctly==you have to do it yourself

Sep 04, 2012 | Lexus Cars & Trucks

1 Answer

Code p1130 p1135 p1150 what are this ??? Thanks

p1130= bank one sensor one, Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (sensor is located underneath near the firewall) p1150= bank two sensor one, Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Directly behind the radiator) p1135=bank one sensor one, Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank one sensor one sensors run around $206 Bank two sensor one sensors run around $150
basically its o2 sensors if your mechanically inclined its a good weekend job to tackle yourself and safe a couple hundred dollars in labour, you would need to invest in an o2 socket and some pbblaster penetrating lubricant to get them out..hope this helps you and dont forget to rate if it does help thanks

Jan 07, 2011 | 2001 Lexus RX 300

2 Answers

Please describe your is there a preformance chip in my 1993 chevy k1500 4x4 and if so where and how much do they cost i was told there was one and it would raise the rpm before shifting and could get me...

Yes there is a performance chip.. Its in the ECU,, its what controls the air fuel ratio, and other things.. Modifying the chips programming will increase performance,, as well as fuel consumption. There are 2 ways to modify this..

1.) purchase a pre modded ecu and switch it with yours..

2.) A mechanic can reprogram the ECU with the modified programming..

In eighter case you will need to find a mechanic who specializes in customization and modification. I'm sure there is one in your area or atleast someone who knows of one..

I strongly suggest you dont attemp the mods yourself because it can damage the ecu, engine , transmission and really mess things up if you make any mistakes..

The modification is done with a diagnostic tool which is capable of reprogramming the EProm in the ECU. The Mechanic will already have the modified firmware for the device,, which he will then burn onto the eprom..

Mar 20, 2010 | Chevrolet 1500 Cars & Trucks

1 Answer

Replacement of o2 sensor

Every new car, and most cars produced after 1980, have an oxygen sensor. The sensor is part of the emissions control system and feeds data to the engine management computer. The goal of the sensor is to help the engine run as efficiently as possible and also to produce as few emissions as possible.
A gasoline engine burns gasoline in the presence of oxygen (see How Car Engines Work for complete details). It turns out that there is a particular ratio of air and gasoline that is "perfect," and that ratio is 14.7:1 (different fuels have different perfect ratios -- the ratio depends on the amount of hydrogen and carbon found in a given amount of fuel). If there is less air than this perfect ratio, then there will be fuel left over after combustion. This is called a rich mixture. Rich mixtures are bad because the unburned fuel creates pollution. If there is more air than this perfect ratio, then there is excess oxygen. This is called a lean mixture. A lean mixture tends to produce more nitrogen-oxide pollutants, and, in some cases, it can cause poor performance and even engine damage.
The oxygen sensor is positioned in the exhaust pipe and can detect rich and lean mixtures. The mechanism in most sensors involves a chemical reaction that generates a voltage (see the patents below for details). The engine's computer looks at the voltage to determine if the mixture is rich or lean, and adjusts the amount of fuel entering the engine accordingly.
The reason why the engine needs the oxygen sensor is because the amount of oxygen that the engine can pull in depends on all sorts of things, such as the altitude, the temperature of the air, the temperature of the engine, the barometric pressure, the load on the engine, etc.
When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. Your car performs poorly and uses more fuel than it needs to.
More to come soon! presently looking for detail instruction on how to repair or replace.
I found this link with info on the sensor .... might be helpful

Oct 06, 2009 | 2003 Lexus ES 300

2 Answers

2001 Hyundai and I have the same code and problem

Firstly, these codes are set when the fuel 'TRIMS' are out of spec (either tool LEAN - P1123, OR too RICH - P1128). The air/fuel control system, in addition to a number of sensors, includes the following components and systems: a. Intake air system. b. Exhaust system. c. Evaporative emissions control system (includes purge control solenoid valve). d. Fuel injectors. e. Fuel pressure regulator. f. Fuel pump. For the air/fuel ratio to be within limits, all of the sensors, components and systems associated with the air/fuel control system must function within normal parameters. STOP replacing parts/sensors unless you can VERIFY they are defective! The Powertrain Control Module (PCM) on Hyundai OBD II vehicles (all 1996 and later models) can adjust the engine Air to Fuel (A/F) ratio to compensate for variations in operating conditions. This adjustment only takes place during "Closed Loop" operation. The PCM uses input from the following components to determine the amount of fuel to deliver:
  • Oxygen sensors
  • Air flow sensor
  • Coolant temperature sensor
  • Intake air temperature sensor
  • Throttle position sensor
  • Engine speed sensor
The ability to adjust the A/F ratio enables the PCM to compensate for engine, fuel and sensor variations as well as temperature, altitude and humidity. This enables the vehicle to maintain a stoichiometric (14.7 to 1) A/F ratio that will ensure optimal engine performance and minimal emissions. Since the PCM can change the A/F ratio to compensate for a wide range of conditions, an indicator is needed to identify that a compensation has been made. Fuel Trim values shown on the HDS scan tool are the primary indicator that an adjustment in fuel delivery has taken place. The scan tool displays the PCM's A/F ratio compensation as "Short Term" Fuel Trim (ST TRIM), Long Term Fuel Trim (LT TRIM), and "Oxygen Sensor" Trim (TRIM B1 S1 and B1 S2). The most beneficial diagnostic information comes from "Short Term" Fuel Trim and "Long Term" Fuel Trim. AFTER ALL THIS, I think it's simply your Coolant Temperature Sensor giving 'FALSE' information to the engine control module/powertrain control module (ECM/PCM).

Aug 11, 2009 | 2001 Hyundai Accent

2 Answers

Check engine light

Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.

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Engine surges only after it warms up!

It sounds like an intake manifold vac leak. After the engine warms up use a can of spray carb cleaner at all edges of the intake. Use short bursts of the cleaner and see if the RPM changes. If it does you have a vac leak. That means replacing manifold gaskets.

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