Hesitation and loss of power in 2000 V70 2.4turbo

Jan 02, 2007 3 Replies
C

I have a 2004 v70 2.4turbo with 66k miles. For the past 1000 miles I have noticed a significant hesitation and loss of power.



· Just after start up, the car runs fine. · The check engine light comes on for about 60 seconds (which I think is a little long). · Once the car warms up, about 3-4 minutes, I start to get the hesitation. It is most notable when the gas pedal is down about 25%; full acceleration appears to be fine. The hesitation will be about 1-2 seconds and then power is restored and the car will buck with the sudden power. · The problem has lessened somewhat since winter has started (I assume it has to due with the cold weather). · At about 60k miles, a full servicing was completed, new spark plugs were installed and air filter and fuel filter. · Fuel economy is decreased about 3-4 miles per gallon

These are some of the possible causes I suspect: · Clogged Cat converter · Clogged fuel filter · Bad O2 sensor (not sure which one, closer to the engine or on the cat converter) · Bad temperature sensor · Bad spark plug wires



I do a lot of work on older cars, but don't have much experience on testing electronic components. Could anyone give me some help on testing to determine the problem? I believe the problem is probably a bad O2 or temperature sensor. I would replace to see if this is the problem but at $250 each, I don't want to purchase and see if it makes a difference.



Thanks for your help. Please just post to the group as I don't check this email.



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J

I would suspect a faulty ETM. I had the flash upgrade done on my 1999 S70 and I notice a difference in response time and performance albeit slight. If you are getting that kind of hesitation I would think you should get a dealer to look at the module for you. Either that or hook your car to on OBDII reader and see if there is anything obvious.

Jordan.

1999 S70 Loaded!

cook wrote:

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G

You need to see if any codes are set in any systems this can be done @ the dealer or someone who has the equipment to read all of the systems in the car your generic OBD2 scanner will not read all the systems in the car Glenn

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C

To further help in the diagnosis, I went to autozone and got a free OBDII analysis. Here it is: P0333 Voltage from Knock Sensor 2 is too high for the current engine operating condition (bank 2) P0338 Voltage signal from crankshaft position sensor "A" is too high for the current operating conditions.

What doesn't make much sense is I am not getting any knocking noise. Shouldn't I be getting this if the knock sensor goes? Does this problem indicated 2 things going wrong or one thing causing both to go awry? Given that this is an international crowd, I should mention that my winter temps are about 0 C (32 F).

Based on this, how would one test the Knock Sensor? Where is this Knock Sensor 2?

Thanks.

Glenn wrote:

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