Question about Cars & Trucks
With cruise control on runs better ive changed fuel fiter that heled fuel pressure is 55lbs
Sounds like a timing problem or a vacuum leak. But you do need to specify the year, make, and model for any kind of accurate answer. If the vehicle is OBDII (96 or newer), it should have the service engine light illuminated and needs to be scanned for trouble codes.
Posted on May 04, 2015
Intake air leak of some sort, vacuum pipe etc but you are going to have to tell us the make model year etc and anything you have already checked?
Posted on May 02, 2015
Testimonial: "thanx tim im gunna go take the egr off see if the piston moves while runnin that would make sence why it only does it occasionally"
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Posted on Jan 02, 2017
sounds like you have a huge vacuum leak at the engine, check under the hood for a sucking noise, I think you will find one.
Posted on Aug 26, 2008
SOURCE: loss of power and misfires
It sounds like the catalytic converter. I had the same problem. What to check....after driving for a couple of miles pull over and look underneath at the converter, if it is glowing there is your trouble.
Posted on Dec 04, 2008
You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach
You learn the vehicles Systems,Test,then Replace,if you have a failed component.
Work on the Misfire Issues.
Then you lean O2 Codes will go away.
Not a the plugs.
Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors
Posted on Nov 24, 2010
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 valveFaulty catalytic converter(s)Stuck/blocked EGR valve / passagesFaulty camshaft position sensorDefective computer
Possible Solutions: If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. 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.
Hope this helps.
Posted on Mar 08, 2012
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