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Old 11th April 2011, 11:30   #1
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Default Tata Vista TDi : Drop in power with cold engine + aircon

I am having a peculiar ac problem with my Vista Tdi.
When i am taking the car out for the first time in the day, and i switch on the ac when i have not driven for 5-6 kms, i feel the engine's pulling power to be greatly reduced, actually it's horrible especially in 2nd gear .
But, when i have done some 5-6 kms, and then when i switch on the ac, it behaves normal, although there's a very small feel of engine lag.

What could be the probable reason for this or what i am feeling is not correct?

Also, what is the correct way of driving with ac on because i assume, there will be a little bit of lag when the ac is on
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Old 11th April 2011, 13:09   #2
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Default re: Tata Vista TDi : Drop in power with cold engine + aircon

The engine needs to be warmed up sufficiently before it churns out optimum performance.
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Old 11th April 2011, 14:32   #3
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Default re: Tata Vista TDi : Drop in power with cold engine + aircon

Do idle you car for a minute before driving it, especially early mornings
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Old 11th April 2011, 15:14   #4
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Default re: Tata Vista TDi : Drop in power with cold engine + aircon

@Turbo Delight, as has been said above: pls remember to idle the engine for about a minute before you start. Also avoid using the a/c immediately after starting, esp on a cold engine.

But one more question - was any other work done on your car recently ?
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Old 11th April 2011, 15:35   #5
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Default re: Tata Vista TDi : Drop in power with cold engine + aircon

You should switch on your car's AC only when Engine has sufficiently warmed up. This will cause less strain to the engine and will not cause drop in pick up. Follow as others have suggested and update with result.
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Old 11th April 2011, 18:00   #6
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Default Re: Tata Vista TDi : Drop in power with cold engine + aircon

I dont know whether this is related to your problem or not,but the Vista's 1 service/year policy is too stretched for Indian driving conditions. I have a Vista TDI and i dont drive my car much so it catches a lot of dust.My air filter was clogged because of heavy dust from nearby construction. I just cleaned the air filter and did a thorough service and everything is fine now and I am again getting the initial turbo response which I was missing.
Regarding your problem just check your ECU and other sensors,I hope they are doing the job properly.
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Old 14th April 2011, 11:42   #7
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Default Re: Tata Vista TDi : Drop in power with cold engine + aircon

Thanks everyone for posting the replies. I know that a normal diesel engine does require 8-9 kms of running to reach it's optimum temperature and i do idle for a minute when the engine starts from cold.
But still i am getting this problem. And there was no work done on my car recently. So, i am not sure why i am having this problem.

But, is it that other diesel owners also experience this morning problem ?
If others are not facing, then this definitely is some problem with my car.
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Old 14th April 2011, 12:54   #8
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Default Re: Tata Vista TDi : Drop in power with cold engine + aircon

^^ Diesel engines take longer than Petrol engines to warm up. My Diesel cars take upto 5-6kms in winters to reach optimum operating temperature, while in summers the time taken a lot lesser.
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Old 14th April 2011, 13:20   #9
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Default Re: Tata Vista TDi : Drop in power with cold engine + aircon

Am I missing some thing here?.

Quote:
Originally Posted by turbo_delight View Post
I know that a normal diesel engine does require 8-9 kms of running to reach it's optimum temperature ....
If you do know this and do the same, then why do you complain when your car behaves as you mentioned below?.

Quote:
Originally Posted by turbo_delight View Post
... and i switch on the ac when i have not driven for 5-6 kms, i feel the engine's pulling power to be greatly reduced,....

...But, when i have done some 5-6 kms, and then when i switch on the ac, it behaves normal, although there's a very small feel of engine lag....
I think there is no problem.
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