A/C off, shifts great! A/C on, shifts late!

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05-20-2005, 02:18 PM

dr-rjp

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A/C off, shifts great! A/C on, shifts late!

Why does my tranny hesitate to downshift when the A/C is running, but has no hesitation when it is off?

I'm referring to situations where I punch the pedal, and not gentle acceleration.

Shouldn't the electronics be compensating for the change?

Or is it a torque converter issue, rather than an ECU or ECT issue?

HELP!

05-21-2005, 09:19 AM

s0ber

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My auto works fine, check ur TPS sensor? :\ lol

05-21-2005, 09:35 AM

dr-rjp

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Quote:

Originally Posted by s0ber

My auto works fine, check ur TPS sensor? :\ lol

Which one? The WOT one?

05-21-2005, 09:37 AM

Kevlo911

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I am the same damn problem. AC on, it doesn't want to downshift, if it does its too late

05-21-2005, 09:39 AM

s0ber

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Dunno, I try not to WOT with A/C on, kills my gas. Plus with the extra load it feels crappy...

05-21-2005, 09:47 AM

Kevlo911

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It doesn;t have to be WOT. Say you are going like 30mph, it will stay in 3rd gear w/ throtle at 75%. With the AC off in same situation, it will downshift to 2nd.

05-21-2005, 10:04 AM

s0ber

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Yeah I know what you mean now, I figured that was normal.. I've been planning a 5spd swap since.

05-21-2005, 10:06 AM

Kevlo911

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Quote:

Originally Posted by s0ber

Yeah I know what you mean now, I figured that was normal.. I've been planning a 5spd swap since.

Great minds think alike

05-21-2005, 04:43 PM

dr-rjp

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I am going to ask a few Infiniti & Nissan techs to see what they say, as well as a couple of transmission shops.

05-21-2005, 07:03 PM

#10

tnd

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hope i dont have that prob

05-22-2005, 12:16 AM

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maximazation

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the reason why i think that is happening is because the A/C draws power from the engine since it is powered by the belt and engine is driving it, so it would cause a little delay...i have also noticed in my last car i had which was an auto and it did the same thing...i could be wrong tho..just my theory