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Random misfire p0300

Fuel Sys. Cl Fault Fuel Sys. Cl Fault Cals Load % 31.37 ETC 194 Degrees Fahrenheit STFT B1% 4.67

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  • Cars & Trucks Master
  • 5,680 Answers

You have to do tune up,wires, sparks plugs,coils.vacuum leak.

Posted on May 06, 2013

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Posted on Jan 02, 2017

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SOURCE: 5vz-fe misfire codes

Replace the coil pack.

Posted on Dec 26, 2008

  • 1861 Answers

SOURCE: the 4runner is throwing 3

Replace the coil pack..

Posted on Dec 26, 2008

  • 1 Answer

SOURCE: 99 4runner 5vz-fe 3.4 misfire

I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.

Posted on Jan 23, 2009

jturcotte
  • 8562 Answers

SOURCE: I am getting Code p0442 Evap Emission system leak

these are hard to diagnose. First trace evap hose from fuel tank to evap cannister. Check for cracks in hose or loose connections. Check out cannister for cracks. Also check hose from cannister to intake manifold. If hoses are good, it may be leaky purge valve. Hope this helps.

Posted on Oct 05, 2010

tunde007
  • 2382 Answers

SOURCE: x type jag 3.0 V6

Hi, What causes a cylinder to misfire? Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression. Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad spark plug wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

If you find a P0300 random misfire code, it means the misfire is random and is moving around from cylinder to cylinder. The cause here would likely be something that upsets the engine's air/fuel mixture, such as a major vacuum leak, a leaky EGR valve or unusually low fuel pressure (weak pump or faulty pressure regulator).

In the case of a steady misfire, isolating the misfiring cylinder is the first step in diagnosing the problem. The old-fashioned method for finding a weak cylinder is to temporarily disconnect each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.
A power balance test will tell you the same thing, but this requires some hookups and an engine analyzer. A power balance test is preferable to pulling plug wires, because it keeps you away from the voltage and prevents the voltage from causing any damage to the electronics in the ignition system.
When a plug wire is physically disconnected from a spark plug, the high voltage surge from the coil cannot follow its normal path to ground through the plug wire and spark plug, so it passes back through the coil. Most ignition systems are robust enough to withstand such voltage backups intermittently but not on a prolonged basis. If the coil or ignition module is already weak, it may push the component over the brink causing it to fail.

Posted on Nov 12, 2010

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2 Answers

What is causing the P0300 random misfire code on my 2001 Mitsubishi montero limited (not sport)?


misfires are for faulty electrics ---plugs, HT leads, distributor coils ECM but they are also from low fuel pressure , faulty injectors, faulty injector wiring
now you say at 5300 rpms is at the top end range so items to check are the fuel pressure ( should be at around 55-65 psi constant) fuel flow (filters , EVAP venting problem
Plugs with excessive gap, Low quality HT leads or faulty leads --excessive resistance is stopping spark at high pulses
ignition control module --failing at high cycles and coil or coils not good enough to handle the high cycles
If you have a distributor , then it may be worn bushes in the distributor that is initiating the misfire by not running true in the housing causing the rotor button to be missing spark for certain leads

May 12, 2016 | Cars & Trucks

1 Answer

What does Fuel Sys 1, and Sys 2 CL mean? What does STFT B1,and LTFT B1 mean?


You have problem could be bad coils,plugs,wires ,vacuum leak,carbon built up.

Feb 11, 2015 | 2000 Porsche Boxster

2 Answers

How do I fix a trouble code for Nissan Murano P0300?


DTC P0300: Random multiple misfire detected. Probable cause:
1. Vacuum leaks, damaged hoses and/or incorrect routing
2. Fuel contamination
3. Ignition system fault. Check ignition module, coil, spark plugs and wires
4. Fuel system problem

Jan 29, 2015 | 2003 Nissan Murano

1 Answer

2002 Mazda MPV P0172 and P0300


-25 LFT? your dealing with a fuel injector that is leaking or not atomnizing, Inspect the fuel pressure vacuum line is fuel coming out of the pressure regulator?

Apr 28, 2012 | Lexus Cars & Trucks

1 Answer

I am getting Code p0442 Evap Emission system leak detected (small) i have cleared it once already and it came back within a day with this Freeze frame Data: Sys 1 CL Sys 2 CL-Fault Calc Load(%) 47.45...


these are hard to diagnose. First trace evap hose from fuel tank to evap cannister. Check for cracks in hose or loose connections. Check out cannister for cracks. Also check hose from cannister to intake manifold. If hoses are good, it may be leaky purge valve. Hope this helps.

Oct 05, 2010 | 2000 Chevrolet Cavalier

1 Answer

5vz-fe misfire codes


Replace the coil pack.

Dec 26, 2008 | 1999 Toyota 4Runner

2 Answers

99 4runner 5vz-fe 3.4 misfire


Replace the coil packs.
Your issue is NOT the converter, or you would have a P0420/P0430 code

Dec 26, 2008 | 2001 Toyota Tacoma

1 Answer

Random engine misfiring- fault code P0300- 1999 cutlass


Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300

Dec 15, 2008 | 1999 Chevrolet Cavalier

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