Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

'02 Nissan Altima smog fail and high idle rpm

  Email This Post

New User

Mar 15, 2010, 2:43 PM

Post #1 of 3 (1936 views)
'02 Nissan Altima smog fail and high idle rpm Sign In

2002 Nissan Altima 2.5
91000 miles

Recently failed smog test. Passed visual, Passed Emissions. But failed the functional check: This vehicle failed the MIL/Check Engine Light Test due to failure to successfully complete all OBD self tests.

Now I did just pick up my car from my mechanic that afternoon before the smog test because he had been fixing a leak from the timing cover. Would that job require the battery to be disconnected causing the memory system to reset?

Well, the smog tech told me to drive it 50 miles or so and then re-test. The check engine light is not on and i'm over the 50 miles.

But before I bring it in again, the smog tech also told me that the idle rpm was 1300. He said it should be 900 rpm. What could be causing this high idle ... and more importantly, for the time being, will the high idle cause me to fail the smog, even though I did pass emissons and my service engine soon light is not on?

steve01832 profile image

Mar 15, 2010, 8:09 PM

Post #2 of 3 (1928 views)
Re: '02 Nissan Altima smog fail and high idle rpm [In reply to] Sign In

Every state has its own rules and regulations when it comes to I/M testing. Here in MASS, our emissions test only consists of the inspector plugging a scan tool in and checking for codes. Depending on where you live will depend on what kind of emissions test is performed.


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Mar 16, 2010, 8:07 PM

Post #3 of 3 (1917 views)
Re: '02 Nissan Altima smog fail and high idle rpm [In reply to] Sign In

cherub; Yes, disconnecting the battery can erase the KAM (keep alive memory). It is very similar to your PC at home. When you turn it on, it goes through several 'checks' before you can start using it. The PCM in your car does the same thing, but takes longer. Usually, two drive cycles. When we 'clear codes', we will attempt to drive the vehicle far enough so that the readiness monitors have completed prior to giving it back to the customer. Note, I said attempt. Some times, it can take several trips. This is so that the PCM can 'relearn' stratedgies. In WA state, the idle speed must be below 1100rpm to test. If your idle doesn't return to normal, have your mechanic check for a vacuum leak, or minimum idle adjustment.
SW Washington

'02 Nissan Altima smog fail and high idle rpm

  Email This Post

Latest Forum Post

I have a 1988 Dodge D100 318 and I just had new timing put in all new plugs spar...

Hi, my partners ford puma's (1.7 2000 65k milage) brakes keep locking up. The pe...

I just bought a 1992 Isuzu Trooper. I seems to run strong with a V6 3.2 liter en...

2004 Ford Explorer 4.0 v6 160k Hey guys so recently my car has been shaking ...

My 87 motor home wont start unless gas is poured into carburetor. I replaced th...

1990 Astro Van with replaced engine (from 1990 C1500 pickup). Unknown true milea...

Feed Button

Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap

Search for (options) Privacy

web statistics