Question about 2002 Ford Ranger Regular Cab

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CAN A SMALL EVAP LEAK CAUSE A CYLINDER MISFIRE

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Not likely. Probably two different problems.

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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2000 Town Car - 3 codes (P0307 - I believe misfire on #7) but P0430 & P0442 I don't know


P0430 - Catalyst System Efficiency Below Threshold (Bank 2) Indicates Bank 2 catalyst system efficiency is below the acceptable threshold.
  • Use of leaded fuel
  • Damaged HO2S
  • Malfunctioning ECT
  • High fuel pressure
  • Damaged exhaust manifold
  • Damaged catalytic converter
  • Oil contamination
  • Cylinder misfiring
  • Downstream HO2S wires improperly connected
  • Damaged exhaust system pipe
  • Damaged muffler/tailpipe assembly
  • Retarded spark timing
Compare HO2S upstream & downstream switch rate. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage which makes the switching frequency of the downstream HO2S quite slow compared to the upstream HO2S. As catalyst efficiency deteriorates, its ability to store oxygen declines and the downstream HO2S signal begins to switch more rapidly approaching the switching rate of the upstream HO2S. Once beyond an acceptable limit the DTC is set. Catalytic converter bad !


P0442 - EVAP Control System Leak Detected (Small Leak) The PCM monitors the complete EVAP control system for presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.04 inch) is detected by the EVAP running loss monitor test.
  • After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
  • Small holes or cuts in fuel vapor hoses/tubes
  • Canister vent solenoid stays partially open on closed command
  • Damaged, cross-threaded or loosely installed fuel filler cap
  • Loose fuel vapor hose/tube connections to EVAP system components
  • EVAP system component seals leaking (EVAP canister purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly)
EVAP Leaks P0442 and P0455

May 27, 2017 | Lincoln Town Car Cars & Trucks

1 Answer

08 pt cruiser nonturbo. Giving codes random (multiple) misfire, cylinder 3 misfire, camshaft sensor 2 a circuit ( bank one or single sensor), small emissions leak ( evap).What is wrong with this car?


You just listed everything wrong with the car. If you don't feel qualified to troubleshoot and repair it, take it to a certified, reputable mechanic. You have at least two different problems here that will require troubleshooting which can't be done in a couple of sentences.

Jan 31, 2017 | Cars & Trucks

1 Answer

I have a 2004 Lincoln Aviator AWD. It just begun sputtering at idle and when I accelerate. My engine light is on and flashing... the code is P0456 - Small EVAP Leak. Can a leak in the EVAP cause the...


When the evap monitor runs, any leak in that system
will allow unmetered air into the induction system &
yes, cause lean cylinder misfires (fuel trim issues)

You have a MIL Lamp on your dash & have checked
for codes, so you should already be at a shop & scan
the vehicle data for any or all problems

May 02, 2014 | 2004 Lincoln Aviator

1 Answer

P0303 & High Idle


Cylinder 3misfire may be caused by vacuum leak. Vacuum leak can raise idle. If vacuum leak is due to a broken EVAP line, you will get all these codes and symptoms.

Apr 20, 2014 | 2006 Chrysler Town & Country

1 Answer

P1300


Error Code: P0301
Description:
Cylinder 1 - Misfire Detected
Possible Cause:
Wiring.
Ignition system.
Fuel injectors.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression.
Base engine problems.
Engine control module (ECM).

Error Code: P0302
Description:
Cylinder 2 - Misfire Detected
Possible Cause:
Wiring.
Ignition system.
Fuel injectors.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression.
Base engine problems.
Engine control module (ECM).

Error Code: P1300
Description: Random Misfire

Possible Cause:
As above.

Jan 22, 2014 | 1996 Honda Civic

1 Answer

Oil leak and a Cylinder 1 misfire.


Nothing to do with fuel chemistry

As long as ANY light is on you have a problem

Are the upsteam or front O2 Sensors over 100,000 miles

Your exhaust converter is 12 to 14 years old,that's when they
just look good & do nothing inside

Sep 11, 2012 | 1998 Nissan Maxima

1 Answer

My Nissan yesterday started idling terribly and when I was driving it was shaking and vibrating so bad it felt like I was driving with square tires.


I doubt the EVAP problem is causing the rough running. The knock sensor code means the knock sensor noted a severe vibration. The cylinder 4 code could mean the miss has become bad enough to trigger a code for one cylinder.
I would look at the injectors and for a vac leak. And the spark plugs can be firing in air but not inside the cylinders under pressure.

Sep 10, 2012 | Nissan Cars & Trucks

2 Answers

P0456 and p0301


The most common misfire causes on the cars I've worked on have been:
  1. Spark plugs
  2. Spark plug wires
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket


Article Source: http://EzineArticles.com/1982987

Feb 11, 2012 | 2005 Dodge Neon

2 Answers

Which is it? Carburetor ice or water in gas?


Hmmm.. Your van has No carburator.. Its direct multiport fuel injection.. It sounds like you have excessive moisture in the tank and lines.. Id try a new fuel filter..

Mar 08, 2009 | 1996 Dodge Caravan

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