Warm start problems - G35Driver - Infiniti G35 & G37 Forum Discussion

Jul 24, 2014 | 02:01 PM

432koi

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Warm start problems

The car starts up fine when the engine is cold, but for warm starts it'll crank then the rpm would drop very low and occasionally stall. I can prevent the engine from dying by hitting the accelerator, but I would really like to get this fixed.

Things I have tried:
New battery
New MAF
New spark plugs
Cleaned throttle body
Hard reset ECU

Any ideas of what else I can try?

Jul 24, 2014 | 02:36 PM

432koi

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This isn't my car, but the problem is nearly identical.

Jul 25, 2014 | 01:52 AM

ScraggleRock

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Throttle body cleaning

Jul 25, 2014 | 05:44 PM

432koi

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Quote:

Originally Posted by treacherous

Maybe?

"ITB11-018a
-REVISED-
2007–2008 INFINITI G35 SEDAN, 2007 G35 COUPE, 2008 EX35, 2009-2010 FX35; ENGINE HESITATION OR STOPS RUNNING AT IDLE OR VERY LOW SPEEDS
The customer reports any of the following:
• Engine hesitation at idle or very low speeds,
and/or
• Engine speed drops lower than expected when decelerating or coming to a stop,
and/or
• Engine stops running at idle or very low vehicle speeds (parking lot maneuvers), but can be restarted."

http://x.infinitihelp.com/forum/loca...4#.U9HWalYlxzF

Thanks, I called the dealership mentioning this TSB, and one of the solutions is to reflash the ecu. They want to charge $140 to do it, this seems pretty high to me to be honest. Does this seem remotely reasonable? Anybody know if it is possible to diy this?

Jul 26, 2014 | 04:21 PM

432koi

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Quote:

Originally Posted by treacherous

It is probably based on shop rate. Any other dealers you can check with? Not generally possible for DIY as it requires an expensive Nissan Consult System and probably a subscription that only Nissan/Infiniti dealer has access to download the flash updates.

The next closest dealership is a couple hour drive away, it looks like I'll just have to pay the fine.

Jul 28, 2014 | 09:03 AM

Moonn

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From: Pittsburgh, PA

I'm currently working through the same issue with my 2008 G35x.

I removed and cleaned throttle bodies over the weekend. Now I'm getting high idle on cold start so I'm going to reset ECU and perform relearn procedures for accelerator pedal release position, throttle valve closed position and idle air volume.

Did you try any of the relearn procedures when you reset ECU?

Jul 29, 2014 | 12:30 PM

Moonn

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From: Pittsburgh, PA

I tried ECU reset and various relearn procedures but I'm not sure if they worked. Idle is still elevated, ~1,400 rpm on cold start but settles down to 600 rpm when warm. Warm start issue seems to been cured.

Can anyone tell me if cold idle speed of 1,400 rpm is OK or do I need to repeat one or more relearn procedures?

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Jul 29, 2014 | 01:22 PM

432koi

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Quote:

Originally Posted by Moonn

I actually have tried the relearn procedures, but honestly I think there might be a bigger problem in my car. From what I understand though it takes the ecu some time to fine tune the idle after it's been reset and I think the rpm will depend on the weather. I've noticed during the winter my cold start idle revs would be very high.

Jul 29, 2014 | 01:48 PM

haildamage

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relearn ECU?

so what's the relearn ECU procedure for the newer models?

so my car does NOT even attempt to start so the RPM needle does NOT move at all.

no crank of any sort...