Question about 2001 Cadillac DeVille

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I have a trouble code po303 misfire in the number 3 cylinder, I have replaced plugs, wires, coil and the crank sensor, none of this solved the problem! Any suggestions.

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Sounds like computer isues theres noughting you can do at home to check this out you might have to bring in and get hooke up to diagnostics. This way you will no what kind of money you have to sink into it. sorry buddy.

Posted on Mar 24, 2011

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You could have a bad or dirty fuel injector for this cylinder,or even an intake gasket vacuum leak at this cylinder intake runner,some times even a sticking valve spring can do the same thing.a bad crank sensor would set a different code and not just affect one cylinder.

Posted on Mar 24, 2011

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It could be a faulty PCM

Posted on Mar 24, 2011

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Check compression in that cylinder if its good it could be fuel injector

Posted on Mar 24, 2011

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1 Answer

Po303


code po303 refers to cylinder 3--misfire detected===causes --engine mechanical fault---wiring---ignition/ fuel system---injector---ECT/MAF sensor---ECM. check plug and HT lead to no 3 cylinder. Check that the injector to 3 cylinder is operational and not blocking or squirting. Have a compression test done to check for compression / gasket problems

Dec 14, 2013 | 2006 Chevrolet HHR

1 Answer

1997 honda civc 4 trouble codes po301,po302'po303'po304


All cyls misfiring. 97 honda. How many miles?Sounds like plug wires or a wet distributor cap. Yet if it is a Vtec The misfires could be occurring after the cams engage. Possible VTEC solenoid issue.

Apr 05, 2013 | 1997 Honda Civic

2 Answers

Miss fire on number 3 cly po303 code on 2000 fodr ranger 4.0


Causes for a cylinder misfire include. Bad spark plug, bad spark plug wire, bad coil ( or coil pack) if no wires, Bad fuel injector..I would start in the order I listed.

Aug 30, 2011 | Ford Ranger Cars & Trucks

1 Answer

Getting a PO300 code, have replaced the crank, MAP sensors, fuel pump and filter and replaced Coil #3 /new Plugs, i am running out of options. Been like this for two weeks and I need a vechile for work.


P0300 Random/Multiple Cylinder Misfire Detected, if your doing the cylinder number 3 the code should have read PO303,, either way, these are some of what needs to be checked A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
  • If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Jun 17, 2011 | Chevrolet TrailBlazer EXT Cars & Trucks

3 Answers

Hello my mustang is sputtering badly, idles at between 900 and 1000 rpm. has a bad exhaust smell and acts like it wants to stall alot. the oem codes it gave were po303 and po316. what does this mean and...


303= cylinder #3 misfire the 316 is just another code for misfire detected during start up:
I would say buy a new plugs and wires, this will correct the problem, Tim

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Apr 25, 2011 | 2002 Ford Mustang

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

Engine light keeps comeing on mecanic change o2 senser worked for half hour came back on cods keep saying its miss fireing have had this problem for a month know


Start Small work to Big = Saved Money!
The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.

Nov 20, 2009 | 2004 Dodge Intrepid

1 Answer

Has a po303 and a po300 code


P0300 is a random misfire and P0303 is a misfire on cylinder 3. That's where the trouble is. Change your sparkplugs and see if the coil that drives the #3 cylinder has signs of damage. Then reset the code. If it comes back, swap that coil with another, reset the code, and see if the misfire code moves. If it does, the problem is the coil. If it does not, the problem is the plug, wire (if applicable), or ignition driver for the coil.

Nov 18, 2009 | 1997 BMW Z3 Roadster

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

4 Answers

HI I HAVE A 2001 MAZDA TRIBUTE AND THE CODES PO301 AND PO303 CAME UP IN THE DIAGNOSTIC REPORT. THE CAR TURNS OFF WHEN I WARM IT UP IN THE MORNING IN THE COLD AND AFTER THAT ITS FINE I ALREADY CHANGED THE...


cylinder 1 misfire and low compression. Plugs and wires changed plus new fuel injectors. The engines still misses and no one can find the cause. When put on the computer it read misfire cylinder 1.

Dec 31, 2008 | 2004 Mazda Tribute

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