Question about 2003 Mercury Mountaineer

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Car is running rough, but no codes r being detected

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May just be a vacume leak, Might stop by a locial shop and ask them to just look at it and see if you need to replace a vacume line, You could also have a little water in your tank, "bad Gas" try a bottle of HEAT and add to your gas tank, This will clean up and deposits and moisture in your fuel line and tank. Good luck to you.

Posted on Apr 11, 2011

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Starts up but runs rough, exhaust smells, and when you give it gas it wants to shut off.


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My 2001 dodge Dakota is running rough and the check engine light is on.


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Feb 17, 2015 | Dodge Cars & Trucks

1 Answer

What is code p0300?


P0300 - Random, Multiple Cylinder Misfire Detected Fault Code Definition
  • Random, Multiple Misfire Detected
Symptoms
  • Check Engine Light flashing
  • Rough running, hesitation, and/or jerking when accelerating
  • In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
Common Problems That Trigger theP0300
  • Worn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable)
  • Incorrect ignition timing
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  • Low or weak fuel pressure
  • Improperly functioning EGR system
  • Defective Mass Air Flow Sensor
  • Defective Crankshaft and/or Camshaft Sensor
  • Defective Throttle Position Sensor
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1994 nissan runs rough when you take off.


You probably can't but if it's running rough on acceleration under load, the first suspect is a dirty fuel filter.

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Misfiring


code p0303 refers to cyl 3 misfire detected ===causes engine mechanical fault--wiring--ignition/fuel system--injector--ECT/MAF sensor--ECM
code p0316 refers to misfire detected during start up --first 1000 revs===causes --engine mechanical fault--wiring--ignition/furl system--injector
the common fault cause is ignition/ fuel system and injectors so I would be checking fuel pressure and injector systems for clean and wiring connections are good especially on no 3 injector.

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Diagnostic codes p0171


P C M detects an excessively lean condition. (just a suggestion, Have MASS AIR FLOW SENSOR CHECKED AND CLEANED. This may solve the problem. Good luck.

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Codes:p1346/p1349/p1354/p0446/p0300/p0301/p0303/p0305/p0307/ p0430/car runs rough when idling/lexus gs 400 1998


P0301 Cylinder No. 1 Misfire Detected
P0302 Cylinder No. 2 Misfire Detected
P0303 Cylinder No. 3 Misfire Detected
P0304 Cylinder No. 4 Misfire Detected
P0305 Cylinder No. 5 Misfire Detected
P0306 Cylinder No. 6 Misfire Detected
P1346 Variable Valve Timing (VVT) Circuit Range/Performance Fault
P1349 Variable Valve Timing (VVT) System Malfunction
P0330 Knock Sensor
P0446 EVAP Vent Control Fault
P0430 Catalyst System

Stop driving immediately.....

You defiantly skipped on your timing........

Feb 14, 2011 | 1998 Lexus Gs 400

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sounds like a cylinder has low compression

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Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.

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1999 Ford E250 van Rough running


complete tune up plugs wires distributoe cap and rotor

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