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Crazy idle

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  #1  
Old 06-01-2018, 01:57 AM
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Crazy idle

Yes I searched but didnt find all my answers

Last time I drove my car was November 2017( I did turn the car on every other day )... now I started to drive it again and the idle is around 950.. then randomly drops to 800 back to 950 .. around those numbers... I can hear little pops in the exhaust and it just happneds ay random sometimes it last for 10 seconds sometimes for 2 seconds


My question is
Is this been caused because I never did the idle relearn after installing the nwp throttle body? My check engine light doesnt come on theres no codes I already scanned it



If I get car tuned the idle will be fixed right?
 
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Old 06-01-2018, 10:02 AM
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It's possible putting a new throttle body in caused the problem. Not sure if a tuner will fix it (they should - I would guess), but you can try doing it yourself with the foot pedal method.
 
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Old 06-01-2018, 10:02 AM
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Popping is usually a misfire, pull and inspect the plugs, run some Sea Foam through the fuel system as well.
 
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Old 06-01-2018, 04:52 PM
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But if it was the coil packs would I get a code by now ?

For the seafoam just pour a entire bottle on a full tank of gas?
 
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Old 06-01-2018, 09:01 PM
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When I SeaFoamed my car; I put a 1/3 in the tank, 1/3 in the crankcase, and 1/3 into the intake via the brake booster hose coming from the battery compartment slowly.

You could get a code or have some misfire counters if you can read OBD2. I'd try the pedal reset first though. It could take several tries to get it working though.
 
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Old 06-02-2018, 12:10 AM
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I don't know exactly which method Nissan employs to determine misfire but its probably a mix of rpm calc, O2 calc, and coil pack voltage sensing and then it takes an educated guess and uses the crank sensor to determine which cylinder is misfiring and if it can't pinpoint one it gives the generic.multiple misfire.

What I think is happening on your vehicle is you have an INTERMITTENT misfire meaning it fires on some cycles but not on others, you can verify by listening to the exhaust because it will.make an irrythmic "thud.... thud thud... thud... thud.... thud thud thud" sort of sound.

Intermittent misfire is usually just a bad spark plug, coil (especially if it only does this with a hot engine) or injector, if it's got a very specific rythym then maybe the ECU just hasn't recognized it as an error yet.
 
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