Part 1 -Misfire Codes: How to Troubleshoot and Repair Them (Toyota 1.8L)

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Misfire Codes: How to Troubleshoot

and Them (Toyota 1.8L)

May 03, Updated: May 13, 2013 Written by: Torres-Arredondo

A misfire condition and its misfire trouble code can be the one of many different components failed. that troubleshooting its can seem almost impossible.

For the misfire code could be by a bad Coil-on-Plug (COP) ignition or a bad fuel injector, or in one engine having very low compression, and the could go on. but I think you get the idea.

The news is that testing a code, or misfire codes, or a idle condition is not that and it’s something you can do!

In this I’m going to explain in detail the most common of misfires and misfire codes P0301, P0302, P0303, -OBD II equipped 1.8L

I’m also gonna’ you a simple diagnostic strategy will help you get to the bottom of the is causing your Toyota’s (rough idle).

W hat is a Misfire

In the simplest of terms, a misfiring is a cylinder that’s ‘dead’, it’s missing one of the 3 things it for the combustion process to take It’ll be missing fuel or spark, or air (compression).

So, if just one of the cylinders is ‘dead’, the engine’s and performance will be affected for the If your Toyota has two misfiring it’s not gonna’ start and run and if it it’s not gonna’ go anywhere.

are a few other symptoms you’ll see a misfire:

The check engine light will be on.

One or more misfire (P0300-P0304) will be stored in pick up’s PCM memory = Powertrain Control Module = injection computer).

P0300 Cylinder Misfire.

P0301 #1 Misfire.

P0302 Cylinder #2

P0303 Cylinder #3 Misfire.

Cylinder #4 Misfire.

Sometimes, tho’ your OBD II equipped is suffering a bona-fide misfire, the PCM set/register any misfire codes (no engine light either).

of power upon acceleration.

of unburned gas exiting the tail

Rough idle and may stall.

but does not start.

Will not the emissions tests.

Bad gas mileage.

the misfire codes don’t you what exactly is the cause of the or rough idle condition. is a way to find out exactly what is it.

One of the most important things you to know, to successfully diagnose a or rough idle condition, is causes a misfire. Let’s go to the subheading and find out.

W hat a Misfire Condition?

To get to the meat of the each cylinder, in your 1.8L 4 banger, needs 3 to create and output power, 3 are:

It’s when a of fuel, or a lack of spark, or a of air (compression) occurs, in one or several of the engine’s cylinders, that Toyota starts to misfire. look into more

Ignition System . The ignition is responsible for the production and delivery of The ignition system is usually the behind most misfires.

The usual suspects (that a Misfire) are:

BAD spark

Carbon tracks on the spark and spark plug Boot.

Toyota Corolla II

BAD (COP) ignition coil.

Oil (from the valve cover) the spark plugs and spark boots (this is a very problem).

Testing all of the ignition components is not hard and it doesn’t expensive tools or expensive equipment.

The following tutorial help with what a track is and how it can cause a misfire

Carbon Tracks are a Common of Ignition Misfires (at: ).

Here’s another real case study worth at:

Fuel System . The Fuel is responsible for the delivery of fuel. If is missing from any one specific cylinder, it will misfire.

Fuel system problems include some of the following:

BAD injectors.

Broken fuel connector (this is a very, common problem).

Electrical in the fuel injector wires are keeping the fuel injector signal from reaching the injector.

This is usually the of human error and after a mechanical repair where the harness was damaged.

BAD fuel computer not pulsing the fuel (this is a very rare but it happens).

BAD fuel pump.

The tutorial should be of help:

Mechanical Condition . The pistons and head valves are the ones draw air into the engine. all cylinders wear out evenly. but now and then, either thru’ of maintenance or some mechanical you’ll have one or more out at an accelerated pace.

To make the long story those cylinders (with wear and tear) to produce a than average Compression that will cause a condition.

Other issues, can not be overlooked are vacuum leaks.

out this tutorial:

Toyota Corolla II


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