Question about 1995 Oldsmobile Aurora

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All of a sudden my car has a miss and lack of power, a stumble when starting off.. The last time this happend it was a coil for cyl 3 & 8. how do I check this out ?

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  • Oldsmobile Master
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A SCAN TOOL WILL TELL YOU WHAT CYLINDERS MISFIRING.THATS QUICK WAY TO CHECK.CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS BY FILLING GAS TANK AND PUTTING A BOTTLE SEA FOAM IN TANK.MISFIRING LACK OF POWER AND STUMBLING ON ACCELERATION MOST TIME CLOGGED FUEL INJECTORS WILL CAUSE THOSE PROBLEMS.

Posted on Jul 12, 2010

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  • Oldsmobile Master
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Hook it up to an OBD-II scanner and check for a miss if it is obd-II compliant.
OBD II DIAGNOSTIC TROUBLE CODES Introduction To comply with On-Board Diagnostics Second Generation (OBD II) regulations, the Powertrain Control Module (PCM) is equipped with software designed to allow it to monitor vehicle emission control systems and components. Once the ignition is turned on or the engine is started, and certain test conditions are met, the PCM runs a series of monitors to test the emission control systems and components. Test conditions include different inputs such as time since startup, run-time, engine speed and temperature, transaxle gear position, and the engine open or closed loop status. Once the monitor is started, the control module attempts to run it to completion. If a particular monitor fails a test, a code is set and operating conditions at that time are recorded in memory. If the same component or system fails twice in succession, the Malfunction Indicator Lamp (MIL) is activated. Monitors are divided into 2 types: Main Monitors and the Comprehensive Component Monitors.

  • Catalyst monitor
  • Exhaust Gas Recirculation (EGR) monitor
  • Evaporative (EVAP) emissions monitor
  • Fuel system monitor
  • Misfire monitor
  • Oxygen (O2) sensor monitor
  • O2sensor heater monitor
Certain monitors, in particular the fuel system and misfire monitors, have limitations that are different from any of the other monitors. The first time either of these monitors fail, the MIL is activated, and engine conditions at the time of the fault are recorded. In order for the control module to turn off an MIL related to these 2 monitors, it must determine that no faults are present with engine operating conditions similar to when it detected the fault. To qualify, the engine must be operated within a specified speed range, engine load range and temperature range. A warm-up cycle is considered to be vehicle operation after the engine has been turned off for a period of time, with the Engine Coolant Temperature (ECT) input rising a specified amount and reaching normal operating temperature. When the MIL is turned off because a fault is no longer present, most OBD II codes will be erased after a minimum of 40 warm-up cycles. Misfire and fuel system codes require a minimum of 80 warm-up cycles before they clear. OBD II Systems use a standardized test connector, called the Data Link Connector (DLC). It is usually located under the left side of the instrument panel. The DLC is located out of the line of sight of vehicle passengers, but is easily viewable from a kneeling position outside the vehicle. The connector is rectangular in design and contains up to l6 terminals. It has keying features to allow for easy connection. Both the DLC and Scan Tool connectors have latching features that ensure the scan tool will remain properly connected. Some common uses of the Scan Tool are to identify and clear Diagnostic Trouble Codes (DTC's) and to read control module freeze frame. The Malfunction Indicator Lamp (MIL) looks similar to the "Check Engine" lamp. However, on OBD II Systems, it is controlled under a strict set of guidelines that dictate when the MIL is illuminated. If any of the control module monitors detects a fault that could impact vehicle emissions, a fault code is set. A One-Trip Monitor requires that a test fail once, a Two-Trip Monitor requires a test fail twice in succession, and a Three-Trip Monitor requires that a test fail 3 times in succession to activate the MIL. The MIL is mounted in the instrument panel and has 2 functions: To act as a bulb check at key on and to inform the driver that an emissions fault has occurred. Once the engine is started, if no faults are detected, the control module should extinguish the MIL after a few seconds. If the MIL remains on or flashes with the engine running a driveability symptom is present. Federal law required all vehicle manufacturers to meet On Board Diagnostics, Second Generation or OBD II standards by 1996. In order to meet this standard, the automobile's on-board computer must monitor and perform diagnostic tests on vehicle emissions to ensure that the vehicle is operating at an acceptable (legal) emission level. The maximum allowable emission level is set by the Federal Test Procedure (FTP). All 1997–01 vehicles are OBD II compliant. All OBD II vehicles have the same 16-pin diagnostic connector or DLC. This eliminates the need to have a manufacturer specific connector to plug a scan tool into your vehicle. all of a sudden my car has a miss and lack of - prev.gif next.gif

Posted on Jul 12, 2010

Testimonial: "i know this but the check eng light never came on,i'm looking for a way to check the coils."

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1 Answer

Shift light flashing changed transmission \coil ecm\pcm transmission module diagnostics cyl missfire invalid data u0401


First is year make and model. A U code is data communication codes. Sorry to say, you could have done all this and it could have just been a bad wire.

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Code 303 is a miss or lack of power on cylinder 3. If you know for a fact that cylinder is getting spark it could be an injector problem.
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I would say its the coil. A crank or cam sensor could cause one cylinder to miss, or go completely dead, but I doubt it would affect two cylinders. And you would get a code for either sensor.

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Sport Wrangler 6 cyl. Engine lite flashing. Diagnostic tool lists code PO305. I looked it up and it states misfire in cyl #3 & 5. How do I fix this?


Check the plugs, wires and coil pack for these two cylinders. Most lilkely it is the coil pack, they work for 2 cyclinders at a time. cylinder motors use 3 and 8 cyl moters use 4 of these. If your und=sure where the coil pack is, follow it backwards from the spark plugs.

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I have a Ford Escort 2000 year model. It has a very poor idle. I checked the codes and it showed p0171 p0304 and p1131. I replaced the plugs, wires and the throttle position sensor. The car drove...


The PO 304 ---is a misfire code for cyl #3, just a code

The PO 353 --- is a misfire code for cyl#3 that refers you
to PO 350 which is an undetermined Primary or Secondary
Malfunction You can not have 300 & 350 codes on the same vehicle

The PO171 -is a Lean O2 Code for Bank 1 most likely from
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The PO 1131 ---Lack of Switching ,lean trying to correct
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Personally I think anyone that uses 10 oz of anything,
in an 16 to 18 gallon fuel tank is wasting their money
There has never been any mfg recommend injector cleaner
In a ford they say not to use it,as it will damage the pintel coating,
which I doubt,still useless product

Did you clean the MAF Sensor

Continue to check for leaks,including
the EVAP System Hoses & Components

I would scope the O2 Sensors,you won't have
a scope & I don't care for a meter, as you don't
see the switching counts or time if they are old & slow

At 100,000 miles, change the ones closest to the engine

For a 40 mph issue under the slightest of vacuum load
check the Egr Valve,unplug hoses,plug them & road test
up hill

Do all your egr & coil testing on a hot day & up hills,
easy on the gas to load the engine some

The misfire codes you get on a ford are only correct about
2/3 of the time & you disregard almost all the misfire ones
You may have to walk 1 new coil until you get to the bad one

Your real issue is the idle problem
Check all vacuum items
Be nice if you could Smoke Test everything
& end that exercise

Check the cam timing before you spend days
going into the belt area

You could use a scanner to look at data,don't know if
you know anyone with one at work

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2 Answers

Cyl. 3 miss fire code po303


my money would be on the coil cover, especially if it had been a long time since the last tune up. it is certainly worth trying, as this is part of a routine tune up anyways. good luck!

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4 Answers

Missing and stumbling during acceleration


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