Question about 1993 Buick Skylark

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1993 Buick Skylark Custom 2.3 4 cy runs extremely rich and rpm surges at midrange?

Have changed ECM,fuel reulator,idle circut sensor,map,temp sensor x2 just to name a few?

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  • Ronald Dennison Sr.
    Ronald Dennison Sr. Dec 12, 2012

    replaced the ECM again and oxygen sensor... car runs better then ever?????


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Not sure if the 93 has a mass airflow sensor, i know it has a air charge temp sensor that can cause the issue you are describing.

Posted on Oct 26, 2012

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Could be as simple as your battery issending low voltage to the ecm, causing false codes and a rich condition. check your battery before you chase anymore codes. Sounds funny but costs nothing and kept me from buying new cats and an alternator. If this fixes it your car will relearn the settings after a couple days.

Posted on Dec 22, 2012

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SOURCE: my moms 1993 buick skylark 4dr custom idle is

Air mass meter!

Posted on Jan 13, 2010

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SOURCE: intermitant stalling hard starting replaced ecm,

Hi, first thing, is your check engine light on? if it is, you can check the codes yourself, get a paper clip unfold it so you got 2 straight ends, find your dianostics port where you plug in the scanner, take the paper clip and stick one end into the one on the far right and the other to the one next to it and turn ignition key to on position, check engine should start blinking if not move the last end of paper clip you plug into the next one in port until it does( turning key off each time before you move paper clip end) do this procedure until the light starts to blink. When it blinks count the blinks, for example it will blink one time than a pause than blink twice quick which means 12 and so on. It will start out with a 12 which means the computer is ready to give stored codes. Just write down the codes and either take them to napa, or auto zone, or to a shop you know, and they can tell you what they mean. On a car that old it could be almost anything, parts wear out, but right now what stands out to me by your description i would check the cadalitic converter it might be plugged. Take some advise get someone that knows something about cars or at least works on them on a regulator bases. That way your not playing a gessing game.

Posted on Sep 24, 2010

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Code 172 hhr

DTC P0172: Fuel Trim System Rich !
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of purge to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.
If the ECM detects an excessively rich condition, DTC P0172 sets
Circuit/System Testing For DTC P0172
Allow the engine to reach operating temperature. With the engine running, observe the Long Term FT parameter with a scan tool. The value should be more than approximately -20 percent with the engine running at operating temperature.

If the value is not more than -20 percent, inspect for the following:

With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa.

If the MAP sensor parameter is not between 19-42 kPa, refer to DTC P0106 .

With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.

If the MAF sensor parameter is not within 2-6 g/s at idle, refer to DTC P0101 or P1101 or DTC P0102 or P0103 .

Vacuum hoses for splits, kinks, and improper connections

The air intake duct for being collapsed or restricted

The air filter for being dirty or restricted

Objects blocking the throttle body

Excessive fuel in the crankcase due to leaking fuel injectors

The evaporative emissions control system for improper operation

Excessive fuel pressure

Malfunctioning fuel injectors

Fuel contamination

The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system

The HO2S signal circuit shorted to voltage

Oct 05, 2015 | Cars & Trucks

1 Answer

1997 2.4L Buick Skylark stalling during takeoffs

There could the dirt in the engine carburetor please clean it or the the engine is getting rich ,or the on board computer may be faulty in the car or the wiring of the spark plug is defective get it checked ..............................

Good luck............................

Jun 12, 2008 | 1993 Buick Skylark

2 Answers

1997 buick skylark oxygen sensors

forget all that work! just replace the transmission shift sensor

Dec 03, 2013 | 1997 Buick Skylark

1 Answer

My 1993 chevy caprice wont stay started changed pluges wires fuel pump distributer cap and cleaned injectors

For the engine to stay running the ECM will need to know how much Air is need,You engine is speed density, There is only 2 places of concern IAC (idle air control) and Map (manifold air pressure). The idle air control is a 4 wire stepper motor, The ECM make changes to maintain desired idle, When this IAC fails the engine management can no longer maintane desired idle and engine stalls. Your going to have inspect the pintle to see if it has the ability to extend to raise RPM and if it can retract to lower RPM. As for the MAP sensor just inspect to see it any of the vacuum hose has fell out or is cut or if you hear a hissing noise, If anything the IAC has failed

Apr 25, 2011 | Chevrolet Caprice Cars & Trucks

1 Answer

What is code p1133

Circuit Description
The powertrain control module (PCM)/engine control module (ECM) constantly monitors the oxygen sensor (O2S 1) activity for 100 seconds . During the monitor period, the PCM/ECM counts the number of times that the O2S 1 switches from rich to lean and from lean to rich. With this information, a total for all switches can be determined. If the number of switches is too low, DTC P1133 will set. The lean-to-rich and the rich-to-lean are greater than 18 switches.

Conditions for Setting the DTC
  • DTCs P0106, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0131, P0132, P0134, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0402, P0404, P0405, P0406, P0443, P0506, P0507, P1130, P1404 and P1627 not set.
  • Engine is operating in closed loop.
  • Purge D.C. is greater than 0%
  • Engine coolant temperature (ECT) is above 72 °C (162 °F) .
  • The engine has been operating for at least 120 seconds .
  • Calculated airflow is between 9 and 42 grams/sec .
  • Canister purge duty cycle is greater than 2%.
  • Engine speed is between 1600 rpm and 4000 rpm .
  • 0 second delay after conditions are met.
  • Airflow is between 7 and 40 g/sec .
Action Taken When the DTC Sets
  • The PCM/ECM will illuminate the malfunction indicator lamp (MIL).
  • Open loop fuel control will be in effect.
  • The PCM/ECM will store conditions which were present when the DTC was set as Freeze Frame and in the Failure Records data.
  • A history DTC is stored.
  • Coolant fan turns on.
Conditions for Clearing the MIL/DTC
  • The PCM/ECM will turn the MIL off on the third consecutive trip cycle during which the diagnostic has been run and the fault condition is no longer present.
  • A history DTC P1134 will clear after 80 consecutive warm-up cycles have occurred without a fault.
  • DTC P1133 can be cleared by using the scan tool CLEAR INFO function or by disconnecting the PCM/ECM battery feed.
Diagnostic Aids
DTC P1133 is most likely caused by one of the following items:
  • Fuel Pressure - The system will go rich if the fuel pressure is too high. The PCM/ECM can compensate for some increase. However, if it gets too high, a DTC P1133 may set. Refer to "Fuel System Diagnosis".
  • Leaking injector - A leaking or malfunctioning injector can cause the system to go rich.
  • Manifold Absolute Pressure (MAP) sensor - An output that causes the PCM/ECM to sense a higher than normal manifold pressure (low vacuum) can cause the system to go rich. Disconnecting the MAP sensor will allow the PCM/ECM to set a fixed value for the MAP sensor. Substitute a different MAP sensor if the rich condition is gone while the sensor is disconnected.
  • Pressure regulator - Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the pressure regulator.
  • Throttle Position (TP) sensor - An intermittent TP sensor output can cause the system to go rich due to a false indication of the engine accelerating.
  • O2S 1 contamination - Inspect O2S 1 for silicone contamination from fuel or improper use of RTV sealant. The sensor may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The PCM/ECM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem.

Dec 03, 2010 | 1999 Daewoo Nubira

3 Answers

1993 buick skylark w/ 3.3 V6. Died at stop

You have 35 psi of fuel pressure and injection pulse?

Jul 08, 2010 | 1993 Buick Skylark

2 Answers

91 chevy 4.3 v-6 runs extremely rich when engine is cold gives codes 13, 33 and 54 I know what these codes are but I need to know is could the computer coolant temp sensor or the air cleaner temp sensor...

DTC - 13 Oxygen sensor circuit open or no activity
DTC - 33 MAP sensor circuit error (signal high indicating low vacuum)
DTC - 54 Fuel pump circuit low voltage

Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.

The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".

Jan 10, 2010 | 1991 Chevrolet S-10

1 Answer

1993 Hyundai Excel motor runs very rich fuel mixture at idle and at all speeds. Fuel injected.Stalls easily at idle.Black smoke out of exhaust.Have replaced temp sensor to no avail.

sure he has an ecm installed .. its an injection based car.. probably air filter isn't that good .. also check if air intake pass is clear of any wastes

Apr 27, 2009 | Hyundai Motor 1993 Excel

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