Question about 1998 Toyota Corolla

3 Answers

Check engine light is on the code was po300 cylinder misfire detected probable causes are vacuum leak injector fault high or low fuel pressure or ignition system fault spark plugs,ignition wires, or coil

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  • ssdog77 Mar 03, 2009

    how to u detect a vacuum leak

  • ssdog77 Mar 03, 2009

    the spark plugs are brand new the ignition wires look good how do i check the coil

  • ssdog77 Mar 06, 2009

    i got some boschplatinum plugs that are alrady gapped 2 weeks ago i pulled them out yesterday the bottom of the plugs was black.i went to autozone the salesman said the plugs that i bought were bad for my car.so i bought the right ones. i changed them out.the engine light came back on after driving it for a minute.it still seems to be driving messed up.should i get the plug wires and install them.i did not put premium gas in the car.all i did was change the plugs and put some fuel injector cleaner in it.i want to starve all the gas out of it first then ill put some 89 octane in it then i think i will change the plug wires.how do i reset the check engine light.

  • ssdog77 Mar 06, 2009

    i think i will change the wires today should i drain all the gas out of it.

  • ssdog77 Mar 06, 2009

    should iclean the throttle body

  • ssdog77 Mar 07, 2009

    i got some ngk plugs and new plug wires and its running a hell of alot better now thank you

  • ssdog77 Mar 07, 2009

    how do i reset the check engine light though i drove it all day it didnt come on until when i drove it today

  • Anonymous Mar 18, 2014

    Engine check light; final stage (fault code light) High voltage

  • Anonymous Mar 18, 2014

    Engine check light; final stage (fault code light) High voltage

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3 Answers

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  • Toyota Master
  • 1,861 Answers

I respectfully disagree.
A P-0300 will NOT be set in a Corolla by a dirty fuel filter.
Replacing the fuel filter could be a very costly operation, as I have observed that the fuel line threads that connect to the fuel filter easuily get damaged when removing the fuel filter.

In short, don't replace the filter until you are SURE that it is the culpit.
In this case, the fuel filter is NOT the culprit..
Save your money; and your time.
Additionally, premium fuel does not clean fuel injectors. That expense would be a waste of money. The engine will actually run WORSE on premium fuel; the engine is NOT designed to run on premium. 87 or 89 (better choice/89) is the grade to use.

If you really want to track down the P-0300 code, which is a multiple/random cylinder misfire, I would look at the quality of the fuel in the car; ie water in the gas. Second, I would remove the plugs and examine them closely. A worn center electrode will also set the P-0300 code, as will bad/weak plug wires (over 5 years old).

Please feel free to contact me back if you need further assistance. Thanks for choosing FixYa for assistance.

Posted on Mar 05, 2009

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  • Toyota Ed Mar 05, 2009

    By the way, your Corolla does NOT have an "Air Flow meter".

  • Toyota Ed Mar 06, 2009

    Platinum plugs are not good at all for your car.

    You need Nippondensos, and new wires for sure.



    I'd appreciate a FixYa rating for my help. Thanks.

  • Toyota Ed Mar 06, 2009

    Yes. DO clean the throttle body.

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  • Contributor
  • 20 Answers

Code PO300 is a random missfire and may be hard to find. you could have a dirty fuel filter causing a slightly lean condition.I would change it. check for vacuum leaks by spraying carb spray around intake mainfold and listen for engine speed change. stay away from ignition wires. Throw a can of fuel injector cleaner in with your next fillup and put in supreme gasto clean fuel injectors. Also clean throttle body with throtte body cleaner and make sure hose fron throttle body to air flow meter (if it has one) is tight and is not cracked. Finaly disconnect battery for 30 seconds to reset code. Joe ASE Master Tech

Posted on Mar 04, 2009

  • bulldogsja Mar 12, 2009

    I guess I will answer your last question because “TOYOTA ED” is more than likely mad at you now for giving him a low ranking. He is real sensitive about his gold star getting tarnished as I found out reading some of his past solutions. The easiest way for you to clear your computer if you do not have a scanner is to disconnect the battery for 30-60 seconds then reconnect it. Also I stand firm on my recommendation to change the fuel filter as it can cause low fuel pressure and as the service manual states low fuel pressure is a possible cause for PO300. “TOYOTA ED” needs to read the service manual. Also I do not think you are afraid of stripping the threads on a new fuel filter if you were you would not be on this web site asking for advice you would take your car to a shop. I close not by asking you to give me a high vote because unlike “TOYOTA ED” (who begs for a high vote) it really does not mater to me what ranking you give me because competence and honesty needs no vote.

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  • Contributor
  • 24 Answers

What I have found is 9 out of 10 times it's a worn distributer gear.
Many try to say it's the fuel injection , but I have found it to be the distributer gear has worn out.
replace your distributer

Posted on Apr 19, 2009

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1 Answer

It reads codes po300 po300 po522 but it runs perfect sometimes I need to press fuel pedal to start?


code p 0300 refers to random/multiple cylinder misfires detected ===causes spark plugs ---HT leads ---injector/s--ignition coil/s---low compression---wiring
code p 0522 refers to engine oil pressure sensor/switch--low voltage ===causes wiring short to ground ---engine oil pressure sensor /switch---ECM
for the first code having to alter the accelerator position ( which tells the ECM to let in more fuel indicates either a low pressure in the fuel manifold or that the injectors need cleaning
At high way speeds when the engine appears to be running good , it is still possible to have random misfires caused by low fuel pressures and /or dirty injector tips
It would be a good idea to check the oil pressure with a mechanical gauge ,then replace the oil pressure sensor/switch

Sep 26, 2015 | Cars & Trucks

1 Answer

1998 volvo s70 2.4 glt turbo


code p0102 refers to MAF/VAF sensor ---low input ===causes --wiring short to ground. MAF/VAF sensor
code po172 refers to system too rich --bank 1=== causes ---intake blocked --EVAP canister purge valve---fuel pressure ---HO2S sensor
code po random misfires ---plugs --wiring ---injectors--low compression
code po305 refers to cylinder 5 misfire detected ===causes --engine mechanical fault--ignition/ fuel system ---injector ---ECT/MAF

I would check that the air filter is not blocked first as it affects the MAF/VAF sensors . Have a fuel pressure system pressure test done

Feb 13, 2014 | Volvo S70 Cars & Trucks

1 Answer

Is there an erg valve on a honda accord 2008 4 cyl


code p0300 refers to--random/multiple cylinder/s misfire detected...Causes---spark plugs---HT leads---injectors---ignition coils ---low compression ---wiring
code p0302 refers to cylinder 2 misfire detected Causes ---engine mechanical fault---wiring---ignition/fuel system ---ECT/MAF sensors ECM
code po303 refers to cylinder 3 misfire detected Causes Engine mechanical fault---wiring---ignition/ fuel system ---injector---ECT/MAF sensor ECM The common fault to all is the fuel/system ignition
I would have the injectors checked and have a pressure test done on the fuel manifold to check pump and fuel regulator valve.

Apr 05, 2013 | 2008 Honda Accord

1 Answer

I have a 2002 Jaguar X-type. The check engine light came on and it has been acting jumpy/shaky. I recently took it to be diagnosed and the codes I recieved back were P1314, P1316, P1111, and P0302..What do...


All fault codes can be checked out at http://www.bluejag.co.uk but here are the results for some of yours. You can ignor P1111. Looks like a faulty plug or coil pack cylinder 2

Fault Code:- P1314 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire rate catalyst damage -bank 2 NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- ECM Default:- Maximum engine speed reduced


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure
Fault Code:- P1316 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire excess emission NOTE: This DTC will flag only when accompanied by an individual cylinder misfire DTC: P0300 - P0306

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Cylinder compression low Worn camshaft / broken valve spring(s) Fuel delivery pressure (low / high) Fuel injector(s) restricted / leaking Fuel injector(s) continuously open Fuel contamination Fuel injector circuit fault(s) (Injector DTCs also flagged) Spark plug failure / fouled / incorrect gap ECM to ignition coil primary circuit fault (Cylinder misfire detected DTC also flagged) Ignition coil failure

Fault Code:-
P0302 Indicates a Power-train fault


The fault is generally due to a problem in the Ignition or Misfire area


Fault Description: Misfire detected ?€" cylinder 2

Action of ECM:- none


After clearing the DTC, complete the Misfire monitor drive cycle
Check for a reoccurrence of fault DTC.


Possible Fault:- Refer to P0300 Possible Causes

Aug 25, 2011 | 2002 Jaguar X-Type

2 Answers

I just need to know what the vdescription is for the code. the code came up P0300


PO300 IS THE GENERIC CODE FOR AN UNIDENTIFIED ENGINE MISFIRE. iT COULD BE CAUSED BY A SINGLE OR MULTIPLE CYLINDERS. BUT THE FREQUENCY OF THE MISFIRE IS NOT SUFFICIENT FOR THE MONITOR TO PINPOINT. POSSIBLE CAUSES CAN BE LARGE VACUUM LEAKS, EGR LEAKAGE INTO THE INTAKE MANIFOLD, EGR PASSAGE RESTRICTIONS, LOW FUEL PRESSURE, DIRTY FUEL INJECTORS, IGNITION COIL MALFUNCTIONS.
HOPE YOU FIND THIS USEFUL. HAVE A GOOD DAY.

Mar 14, 2011 | 1997 Ford Thunderbird LX

1 Answer

My 98 sonoma truck runs but lacks power with service engine soon light on .trouble code reads po300 cylinder misfire detected (random) what dose this mean


See also: P0300 diagnostic code @ OBD-Codes.com
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect Fuel Pressure
EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Mar 13, 2011 | GMC Sonoma Cars & Trucks

1 Answer

Code p1313 p1316 p1111 p0301 means what?


Odd one this to have P1111 as well.

According to my data P1111 is all dtc checks compleated, http://www.bluejag.co.uk however some websites show it as a Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage, I'm fairly sure that the latter is incorrect.

check the basics first plugs, leads, corroded ground connections etc then its a bit of a guessing game


As for the other codes

P0301 = Misfire detected - cylinder 1
P1313 = Misfire rate catalyst damage - bank 1
P1316 = Misfire excess emission


Possible causes (as per JTIS):

Cylinder compression low
Worn camshaft / broken valve spring(s)
Fuel delivery pressure (low / high)
Fuel injector(s) restricted / leaking
Fuel injector(s) continuously open
Fuel contamination
Fuel injector circuit fault(s)
(Injector DTCs also flagged)
Spark plug failure / fouled / incorrect gap
ECM to ignition coil primary circuit fault
(Cylinder misfire detected DTC also
flagged)
Ignition coil failure

hope this helps

Mar 13, 2011 | 2002 Jaguar X-Type

3 Answers

CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

3 Answers

1999 jeep cherokee 6 cylinder engine light


1.Plugs
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,
Lee

Dec 12, 2009 | 1999 Jeep Grand Cherokee

4 Answers

Po300 random mulitple misfire detected p1399 misfire any cylinder


If only one of your cylinders was misfiring, you probably would be getting a more specific code than P1399.
Also check the distributor rotor along with the cap and coils and wires (as mrgreenz suggests); the EGR valve to make sure it doesn't leak; your fuel pressure which can cause random misfires if the pressure is too low; and injectors if they are really dirty. If you have really high mileage, I probably would first just change out the plug wires with a new set, then reset the DTC and see if the code comes back.
Hope this is helpful as well.

Nov 27, 2009 | 2000 Honda Accord

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