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For the last 2+ winters, it had been getting harder to start the car in temperatures that were below freezing. The battery tested fine in January 2016. In February 2017, the car would crank and crank and it didn't start one morning when it was about 5 deg F. Again, the battery tested fine at above 12V. After searching the internet this winter to try to find out why it takes 2 or 3 times to start when the temperature is under 32 deg F, I found a YOUTUBE video titled "2006-2008 Hard Start and Cold Start Fix". The problem seems to be limited to the 2006 to 2008 FX35 and some FX45s. The solution seems to be linked to replacing that A/C amplifier module that is in the center console with the HVAC controls. The replacement part number is 27760-8Y71A. It's a mystery why the A/C amplifier component would have anything to do with the car not starting when it's cold outside, but thus far, this appears to have fixed the problem.

I had spent a nice chunk of change last winter replacing the spark plugs and all of the coils because after 10 years and about 130,000 miles, a mechanic suggested that there was probably micro cracks in the boots for the coils and moisture was getting in over night as the engine cooled off and then freezing. Last winter, that did nothing for this hard start cold problem or my gas mileage!

The number that is on the part that you will remove if you experience this same hard starting cold problem will be 27760-8Y70A. Infiniti has incremented the part number by "1" (8Y70A versus 8Y71A). Infiniti has apparently recognized that this module has temperature environmental issues as it ages but there isn't any recall or technical bulletin. This part is not cheap. The list price is over $590.

After watching the YOUTUBE video a couple of times, the total removal and replacement time, plus putting the screwdrivers away was only 25 minutes. Follow the video and you will be fine.

Good luck.
 

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Some have found a replacement part on eBay for less than $100 and it seems to help. No word on how long the fix is, but it's a much better option than $500+...
 

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For the last 2+ winters, it had been getting harder to start the car in temperatures that were below freezing. The battery tested fine in January 2016. In February 2017, the car would crank and crank and it didn't start one morning when it was about 5 deg F. Again, the battery tested fine at above 12V. After searching the internet this winter to try to find out why it takes 2 or 3 times to start when the temperature is under 32 deg F, I found a YOUTUBE video titled "2006-2008 Hard Start and Cold Start Fix". The problem seems to be limited to the 2006 to 2008 FX35 and some FX45s. The solution seems to be linked to replacing that A/C amplifier module that is in the center console with the HVAC controls. The replacement part number is 27760-8Y71A. It's a mystery why the A/C amplifier component would have anything to do with the car not starting when it's cold outside, but thus far, this appears to have fixed the problem.

I had spent a nice chunk of change last winter replacing the spark plugs and all of the coils because after 10 years and about 130,000 miles, a mechanic suggested that there was probably micro cracks in the boots for the coils and moisture was getting in over night as the engine cooled off and then freezing. Last winter, that did nothing for this hard start cold problem or my gas mileage!

The number that is on the part that you will remove if you experience this same hard starting cold problem will be 27760-8Y70A. Infiniti has incremented the part number by "1" (8Y70A versus 8Y71A). Infiniti has apparently recognized that this module has temperature environmental issues as it ages but there isn't any recall or technical bulletin. This part is not cheap. The list price is over $590.

After watching the YOUTUBE video a couple of times, the total removal and replacement time, plus putting the screwdrivers away was only 25 minutes. Follow the video and you will be fine.

Good luck.
For the last 2+ winters, it had been getting harder to start the car in temperatures that were below freezing. The battery tested fine in January 2016. In February 2017, the car would crank and crank and it didn't start one morning when it was about 5 deg F. Again, the battery tested fine at above 12V. After searching the internet this winter to try to find out why it takes 2 or 3 times to start when the temperature is under 32 deg F, I found a YOUTUBE video titled "2006-2008 Hard Start and Cold Start Fix". The problem seems to be limited to the 2006 to 2008 FX35 and some FX45s. The solution seems to be linked to replacing that A/C amplifier module that is in the center console with the HVAC controls. The replacement part number is 27760-8Y71A. It's a mystery why the A/C amplifier component would have anything to do with the car not starting when it's cold outside, but thus far, this appears to have fixed the problem.

I had spent a nice chunk of change last winter replacing the spark plugs and all of the coils because after 10 years and about 130,000 miles, a mechanic suggested that there was probably micro cracks in the boots for the coils and moisture was getting in over night as the engine cooled off and then freezing. Last winter, that did nothing for this hard start cold problem or my gas mileage!

The number that is on the part that you will remove if you experience this same hard starting cold problem will be 27760-8Y70A. Infiniti has incremented the part number by "1" (8Y70A versus 8Y71A). Infiniti has apparently recognized that this module has temperature environmental issues as it ages but there isn't any recall or technical bulletin. This part is not cheap. The list price is over $590.

After watching the YOUTUBE video a couple of times, the total removal and replacement time, plus putting the screwdrivers away was only 25 minutes. Follow the video and you will be fine.

Good luck.
Hello,
I have a 2008 Infiniti fx35 and I’ve been having the same cold start issue. I asked the dealership about it and they pretty much laughed and didn’t understand why the A/C amplifier has anything to do with this issue. I’m willing to purchase the part if I can be sure that this is what it is. Are you having any more problems since replacing this part? Please reply
 

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I have a 2006 and have had the starting issues twice and both times it was corrected by replacing the battery. It seems to like a good strong battery with high cold cranking amps. Although the battery turned the engine over fine it wasn't enough to make it fire right up. A new battery fixed it both times.
Being that yours is worse in colder weather I'd give it a try and replace it with one with a minimum of 650cca's.
A test would be to jump it off another car or booster to see if it helps. Then you'll know for sure.
Also let it set for a few seconds between the dash lights coming on and starting it. So turn the key to where the dash lights are on, count 10 seconds and then start it and see if it fires right up then. That would be another indication of a slightly weak battery.
 

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Swapped out the A/C amplifier with the superseded part number. Part cost me over $500 but the problem is fixed. Worth the money. Definitely something wrong with old A/C amplifier and there is some sort of starting circuitry that it affects on the vehicle. Especially on cold mornings.
 
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