Question about 2004 Nissan XTerra

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Computer reads multiple misfires rough idle trouble starting

When the engine is cold the car starts fine, but if it is warm you have to try a few times and then it has a hard time "catching", idle is rough even if rpms increase, tends to idle at about 500 on its own (i have tried putting my foot on the gas to raise the rpms but this does not seem to help)

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The air fuel mixture sensor is probably starting to fail. You need to have a simple diagnosis done at the shop and then have it replaced - they are usually not much a reputable mechanical shops. When the motor warms up your air/fuel mixture changes hence the rough idle etc. Hope this helps.

Posted on Dec 31, 2008

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Can be related to low fuel pressure or problem with crank sensor.


Also it can be weak battery or starter.


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To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------


Click the link below:------


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These details will help.

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This can actually be several things but most common is the coolant temp sensor, it tells the computer how much fuel to give the engine depending on temp, if the sensor goes bad then it may be giving engine too much fuel when it's warm, which may be why it starts fine cold cause it needs more fuel to start cold, try holding the gas pedal to the floor when u start it warm, if it does start and run rough for a few seconds it's cause it was flooded due to excessive fuel.. Get scanned for any trouble codes..

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I have a 92 yj 2.5l 5 speed. it has only after warming up a misfire/rough idle. its fine when its cold and once it warms up and idle comes down it misfires/idles really rough. may be lacking power also. i...


check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.

check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.

The ECT has two wires going to it and is dedicated to sending information to the engine computer. It has nothing to do with your dash gauge that shows coolant temp. That sender has only one wire and is dedicated to the coolant temp gauge.

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