Question about 2001 Daewoo Lanos

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Misfiring ran a obd2 and it showed #4cilinder misfiring where should I start

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  • bpurkey Jun 14, 2008

    I will try that. Thank You

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  • Master
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Replace spark plugs, and if this vehicle come with plug wires do it as well

Posted on Jun 14, 2008

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04 saturn ion ran good when parked started in morning shaking bad check engine light flashing has 7e9 code for 2 months


Check engine light flashing means you have catayltic converter damaging misfire . Don't know where you came up with 7e9 code . This has nothing to do with OBD2 and isn't a code . WithYour lack knowledge of this basic stuff ,your best bet , take it to a qualified repair shop .

Feb 11, 2017 | Saturn Cars & Trucks

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How to find a misfire on a ford obd2


if you have a slight misfire and only get a P0300 random multiple misfire code here is a trick that i use. u will need to have a scanner with a "generic/global OBD2" setting. go into mode 6 and go to special tests and find test number 53. fi you find this you will see a special misfire counter and will show misfire history. clear the codes and get the misfire to come back. recheck this section in the scanner and you will see where that hidden misfire is. this trick is great for finding bad coil boots or water on the boots without going though the trouble of removing all the coils for Ford engines with coil-on-plug systems.

on Nov 19, 2010 | Ford F-150 Cars & Trucks

2 Answers

Obd2 port not working 1999 toyota sienna


Run for 3-4minutes thn turn off n disconnect nevative battary lead 4 5minutes thn connect nevative battery lead n try tht 50-50

Apr 01, 2014 | 1999 Toyota Sienna

1 Answer

Sunfire connection error


If the cig lighter fuse is powered, the engine computer may have died.
Does the check engine light come on when you turn the key switch on ?

Feb 24, 2014 | 2000 Pontiac Sunfire

1 Answer

Legacy misfire


Not much you can do without some testing when the miss is occurring. It could be electrical or the fuel injector.

Jul 17, 2013 | Cars & Trucks

2 Answers

Possible vacuum leak dont know what else


i work for autozone as a tech first question did the obd2 give codes if so what are they the person representing autozone might be green ..
are you getting a single misfire of random misfire
if you are single and you did what you said then do this get a can of spray carb cleaner put the red tip in it start the car and let it idle spray the carb cleaner around the intake and all the vacum lines
if your engine rears up you have a vacum leak eather in the rubber or in the intake manifold
if you had a multi cylinder misfire change the crank sensor that will smooth the engine out
if it runs like a dog check the cam sensor if you car has one ( some use the crank sensor also as a cam sensor
make sure you disconnect the battery before doing anything (mamdatory) after your done re connect the battery and start the car wait 5 min to see if the check engine light comes back on then do another obd2 check at autozone get someone who is well schooled in ignition systems like me if you get another code let me know what the code is and i'll try to help with the explanation

Mar 09, 2010 | 2000 Pontiac Grand Am GT

1 Answer

My 1996 cavalier wont pass inspection as the analyzer cannont communicate with my vehicles computer, what does that mean, autozone computer wont work either . i have no idea what to do, mechanic said it...


Testing your OBD2

Before You Begin
Since all vehicles are not the same please refer to the manual supplied with the OBD2 code reader for vehicle specific instructions.
Is your vehicle compliant?
All cars and light trucks manufactured since late 1995 should be OBD2 compliant. Two factors will show if your vehicle is definitely OBD2 equipped:
  • There will be a note on a sticker or nameplate under the hood: "OBD2 compliant”
  • There will be an OBD2 connector as shown below
april08_img1.gif
Pin 2 - J1850 Bus
Pin 4 - Chassis Ground
Pin 5 - Signal Ground
Pin 6 - CAN High (J-2284)
Pin 7 - ISO 9141-2 K Line
Pin 10 - J1850 Bus
Pin 14 - CAN Low (J-2284)
Pin 15 - ISO 9141-2 L Line
Pin 16 - Battery Power
Where is the connector located?
The connector must be located within three feet of the driver and must not require any tools to be revealed. Look under the dash and behind ashtrays.
Important info about OBD2
  • Can diagnose/check engine problems in all CAN and OBD2 vehicles (1996 and newer) and many of the most popular OBD1 (1981 to 1995) vehicles
  • Features unique patented all-in-one screen display and LED display for quick emissions check
  • Automatic refresh updates data every 30 seconds when connected to the vehicle - an easy way to verify repair completion
  • Code definition can be displayed in English, French and Spanish
  • Can be Flash updated with a standard Windows® PC
  • Features memory/battery backup for off-car review and analysis
Connecting
Connecting the OBD2 Code Reader is as simple as locating the DLC connector. The DLC connector is usually found under the driver side (left side) of the dash. The cable attaches only one.
Reading the LCD Display
april08_img2-small.gifClick to enlarge
Before you start testing, take a good look at the LCD display. The illustration above explains what the various icons mean and how the DTC (Diagnostic Trouble Code) will be displayed. The unit is self-powered by three-AAA batteries and will let you know when they are running low. When connected/receiving power from the vehicle, the CAR Icon will display.
The OB2 code reader is a very simple tool to use. Once it is connected, turn the power on. Once the ignition is switched to the on position, the code reader is checking the system for any stored DTCs.
The meaning of each DTC can be found in the manual supplied with your code reader.

Example: the code reader displays a DTC PO309, Cylinder 9 misfire was detected.
P0298 Engine Oil Over Temperature P0300 Random/Multiple Cylinder Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder 2 Misfire Detected P0303 Cylinder 3 Misfire Detected P0304 Cylinder 4 Misfire Detected P0305 Cylinder 5 Misfire Detected P0306 Cylinder 6 Misfire Detected P0307 Cylinder 7 Misfire Detected P0308 Cylinder 8 Misfire Detected P0309 Cylinder 9 Misfire Detected P0310 Cylinder 10 Misfire Detected P0311 Cylinder 11 Misfire Detected
Once you know what the problem is, you have to determine what's causing it. In this case the intake manifold gasket was faulty. Once the repairs have been made, it is time to clear the DTC and check the system to verify the repair.
Clearing the Diagnostic Trouble Code (DTC)
Clearing the DTC is very simple. Press the ERASE button on the code reader. A message will display on the screen; "SURE" for conformation. If you wish to clear the DTC press and hold down the ERASE button again until a message appears on the screen "DONE". If you did not wish to clear the codes and hit Erase by mistake at the screen message "SURE" simply press the link button to return without erasing any DTCs.
When you clear the DTC(s) from the PCM (Power train Control Module)you also clear ALL of the other gathered information that the PCM has collected, including Freeze Frame, Drive Cycle data, manufacture specific enhanced data end everything stored in memory is erased - just like if you cleared the Cache files on your PC.
The vehicle's PCM will need to re-learn the information that was erased. Don't be alarmed!! This is easily accomplished just by driving the vehicle. All you have to do is get driving.

Good luck and check the OBD 2 connection port.

Dec 02, 2009 | 1996 Chevrolet Cavalier

2 Answers

2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark


might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

Mar 23, 2009 | 2002 Ford Windstar Cargo

1 Answer

OBD2 read Misfire on 2,3 and 4 cylinders


p code will translate more of your problem what is p codes pls

Dec 10, 2008 | 1994 Toyota T100

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