Hesitation and slow accelerating

George Holmer · Oct 17th, 2017, 13:14

I have a June 2000 V70 2.4 20v non-turbo automatic with a hesitation issue. Every so often, if accelerating up from a slower speed or from standing still, the engine does not respond much at all takes a second or two get going. It then has a bit of a burst of speed. This started this summer as I was driving to Spain and has been getting worse.

I did have an issue when I bought the car with the camshaft position sensor which I have now, seemingly, fixed.

I have since replaced the air filter, fuel filter, spark plugs and fuel pump (for unrelated reasons) so they are brand new and I swapped the ETM for one from a scrapped V70 I have with the same vintage and engine, but manual, but that made matters worse.

The autobox has not given me any issues at all and works fine. Any ideas what this could be? I have no engine codes.

C70 98 · Oct 17th, 2017, 13:31

I had pretty similar problems with a T5 earlier, hesitation, revs on idle all over the place, misfires at low revs and generally slow and powerless, no codes anywhere, it was a faulty MAP sensor that caused it.

George Holmer · Oct 17th, 2017, 13:33

Ok, I will try that one.

George Holmer · Oct 17th, 2017, 17:00

Sadly no difference.

C70 98 · Oct 17th, 2017, 17:42

Did you try disconnecting the MAP sensor, just pulling the electrics from it? Don't really know what it could be then, there is a hundred and one things that could cause it.
Air/vacuum leak?

George Holmer · Oct 17th, 2017, 17:57

No, I did not try that. I'll try that too.

Volvo V70 diesel · Oct 17th, 2017, 18:10

Hy George,

Before possessing a diesel V70, I drove a 855, petrol 2,5 20 Valves. To the read of your explanation, I would bend for the crankshaft pulse or camshaft sensor.

What's the type of your engine and the Volvo name of the "gearbox" ?

VV70

George Holmer · Oct 17th, 2017, 21:09

The engine is a B5244S2, the gearbox is the 5-speed, I believe the 5 AWD AW55-50.

I pulled the crankshaft sensor of the donor car but my car is too hot to work on. However, I just had the famous ABS issue come up so I will do the ABS module too tomorrow but when I read the engine codes, it says I have "Knock sensor 1 failure" which is new. Could that cause this issue?

DunkinBiskits · Oct 17th, 2017, 21:45

guys, stop clutching at straws and get a code reader onto it.

all hearsay does is lead people astray.

A dead knock sensor is no good, although there are 2 sensors one might not grab all the necessary sonic info from the block. bear in mind theough that the fault code may be a sympton of a fault, or the cause. dont just assume the sensor is goosed.

George Holmer · Oct 17th, 2017, 21:55

A) As I said, it does not produce any codes (until today that is).
B) I have an advanced code reader and have checked
C) I am extremely fortunate in that I have a scrap car with the exact same engine from September 2000 so I don't have to invest any money in parts. The ETM and MAP came from the scrapped car.

Oct 17th, 2017, 13:14	#1
George Holmer VOC Member Last Online: Sep 16th, 2023 12:51 Join Date: May 2011 Location: Leuven	Hesitation and slow accelerating I have a June 2000 V70 2.4 20v non-turbo automatic with a hesitation issue. Every so often, if accelerating up from a slower speed or from standing still, the engine does not respond much at all takes a second or two get going. It then has a bit of a burst of speed. This started this summer as I was driving to Spain and has been getting worse. I did have an issue when I bought the car with the camshaft position sensor which I have now, seemingly, fixed. I have since replaced the air filter, fuel filter, spark plugs and fuel pump (for unrelated reasons) so they are brand new and I swapped the ETM for one from a scrapped V70 I have with the same vintage and engine, but manual, but that made matters worse. The autobox has not given me any issues at all and works fine. Any ideas what this could be? I have no engine codes. __________________ Current: 2004 LHD Volvo V40 auto Many, many previous Volvos including a V40, a 262C, 945 LPT Polar (Belgian spec), V90, 2006 V70 petrol, 740 TDI, 940 TDI, 850 GLT, C70 2.0GT and V70 D5 auto.

Oct 17th, 2017, 13:33	#3
George Holmer VOC Member Last Online: Sep 16th, 2023 12:51 Join Date: May 2011 Location: Leuven	Ok, I will try that one. __________________ Current: 2004 LHD Volvo V40 auto Many, many previous Volvos including a V40, a 262C, 945 LPT Polar (Belgian spec), V90, 2006 V70 petrol, 740 TDI, 940 TDI, 850 GLT, C70 2.0GT and V70 D5 auto.

Oct 17th, 2017, 17:00	#4
George Holmer VOC Member Last Online: Sep 16th, 2023 12:51 Join Date: May 2011 Location: Leuven	Sadly no difference. __________________ Current: 2004 LHD Volvo V40 auto Many, many previous Volvos including a V40, a 262C, 945 LPT Polar (Belgian spec), V90, 2006 V70 petrol, 740 TDI, 940 TDI, 850 GLT, C70 2.0GT and V70 D5 auto.

Oct 17th, 2017, 17:57	#6
George Holmer VOC Member Last Online: Sep 16th, 2023 12:51 Join Date: May 2011 Location: Leuven	No, I did not try that. I'll try that too. __________________ Current: 2004 LHD Volvo V40 auto Many, many previous Volvos including a V40, a 262C, 945 LPT Polar (Belgian spec), V90, 2006 V70 petrol, 740 TDI, 940 TDI, 850 GLT, C70 2.0GT and V70 D5 auto.

Oct 17th, 2017, 18:10	#7
Volvo V70 diesel Member Last Online: Nov 11th, 2018 17:37 Join Date: Aug 2017 Location: Grenoble	Hy George, Before possessing a diesel V70, I drove a 855, petrol 2,5 20 Valves. To the read of your explanation, I would bend for the crankshaft pulse or camshaft sensor. What's the type of your engine and the Volvo name of the "gearbox" ? VV70 Last edited by Volvo V70 diesel; Oct 17th, 2017 at 18:28.

Oct 17th, 2017, 13:31	#2
C70 98 Member Last Online: Jul 20th, 2021 20:51 Join Date: Aug 2013 Location: Middle part of Volvo country	I had pretty similar problems with a T5 earlier, hesitation, revs on idle all over the place, misfires at low revs and generally slow and powerless, no codes anywhere, it was a faulty MAP sensor that caused it.

Oct 17th, 2017, 17:42	#5
C70 98 Member Last Online: Jul 20th, 2021 20:51 Join Date: Aug 2013 Location: Middle part of Volvo country	Did you try disconnecting the MAP sensor, just pulling the electrics from it? Don't really know what it could be then, there is a hundred and one things that could cause it. Air/vacuum leak?

Oct 17th, 2017, 21:09	#8
George Holmer VOC Member Last Online: Sep 16th, 2023 12:51 Join Date: May 2011 Location: Leuven	The engine is a B5244S2, the gearbox is the 5-speed, I believe the 5 AWD AW55-50. I pulled the crankshaft sensor of the donor car but my car is too hot to work on. However, I just had the famous ABS issue come up so I will do the ABS module too tomorrow but when I read the engine codes, it says I have "Knock sensor 1 failure" which is new. Could that cause this issue? __________________ Current: 2004 LHD Volvo V40 auto Many, many previous Volvos including a V40, a 262C, 945 LPT Polar (Belgian spec), V90, 2006 V70 petrol, 740 TDI, 940 TDI, 850 GLT, C70 2.0GT and V70 D5 auto.

Oct 17th, 2017, 21:45	#9
DunkinBiskits Master Member Last Online: Jan 1st, 2024 13:30 Join Date: Nov 2016 Location: Merseyside	guys, stop clutching at straws and get a code reader onto it. all hearsay does is lead people astray. A dead knock sensor is no good, although there are 2 sensors one might not grab all the necessary sonic info from the block. bear in mind theough that the fault code may be a sympton of a fault, or the cause. dont just assume the sensor is goosed. __________________ https://www.facebook.com/VolvoComposites/ Horsepower is how fast you hit the wall Torque is how far you take the wall with you Last edited by DunkinBiskits; Oct 17th, 2017 at 21:47.

Oct 17th, 2017, 21:55	#10
George Holmer VOC Member Last Online: Sep 16th, 2023 12:51 Join Date: May 2011 Location: Leuven	A) As I said, it does not produce any codes (until today that is). B) I have an advanced code reader and have checked C) I am extremely fortunate in that I have a scrap car with the exact same engine from September 2000 so I don't have to invest any money in parts. The ETM and MAP came from the scrapped car. __________________ Current: 2004 LHD Volvo V40 auto Many, many previous Volvos including a V40, a 262C, 945 LPT Polar (Belgian spec), V90, 2006 V70 petrol, 740 TDI, 940 TDI, 850 GLT, C70 2.0GT and V70 D5 auto.

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