Rough Idle no CEL

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Feb 17, 2019 | 10:14 AM

Desmond Harris

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Newbie - Just Registered

Joined: Feb 2019

Posts: 1

Rough Idle no CEL

At stop lights rpm will drop to about 500 then attempt to recompensate to about 550-600. Car will rumble a little. No CEL. Any ideas? Are there obd2 scanners that can give me an idea without a CEL?

Feb 17, 2019 | 11:58 AM

mahanddeem

Senior Member

Joined: Mar 2009

Posts: 1,382

From: Maryland

Quote:

Originally Posted by Nopike

Probably not, unless you hook it up to Consult at the dealer. Which I would avoid,

I would start at page Page EC-581

https://www.nicoclub.com/FSM/Maxima/...0Maxima/EC.pdf

https://www.nicoclub.com/FSM/Maxima/2014%20Maxima/

only CONSULT? It's not 2001 anymore.
Many scanners (even some cheap ones on Amazon or eBay) can connect to ECU and PCM and read codes from both engine and transmission. Including AFR ratios, fuel pressure, ignition timing, O2 sensors data, in real time as well as logging while you drive. You just need to research and learn on them.
As for the OP, rough idle can come from dirty air filter, worn spark plugs, bad ignition coils, bad gas, clogged fuel filter, clogged EGR valve, etc.. You have to rule out the mentioned things.

Last edited by mahanddeem; Feb 17, 2019 at 12:01 PM.