Engine: B5244: - 2.4T5 - Intermittent stutter/misfire.

MisterGee19 · May 28th, 2021, 18:58

My 2005 2.4 T5 has been well behaved until recently.

Last couple of weeks ago i was travelling on the mway at a steady 70ish and the car started to misfire and hesitate intermittently.. it did it 3 or 4 times and only for a second or two each occasion
since then its done it very occasionally, during light throttle/steady state but very very intermittently. 99.5% of the time its fine, giving it the boot and it still goes like a rocket (its got an MTE remap)
As I knew i had a weak battery, that has been replaced last weekend and codes cleared in case that was causing issues.. but it has not solved the issue.

I have been checking with vida, and there are no codes giving any indication of an issue.

Does anyone have any suggestions about where to start looking? - Dont really want to start firing the parts cannon at it just yet....

Simmy · May 28th, 2021, 22:03

how old are your spark plugs and leads?

jason11 · May 29th, 2021, 00:10

Fuel filter.?

T5R92011 · May 29th, 2021, 00:20

Bad fuel pressure sensor (on the end of the fuel rail) can cause the hesitency.

These are fairly cheap to buy and easy to replace. My last T5 I noticed one morning that throttle response had developed a very slight delay for the engine RPM to raise, and the need to push a bit harder to do so.

New pressure sensor fitted fixed the issue. They are about £30 these days, bosch ones, on ebay. These sensors are worth changing at higher mileage anyway so I'd say try that first.

MisterGee19 · May 29th, 2021, 06:57

So the plugs were replaced in 2018 - genuine Volvo. the car has done less than 5k miles since then.
Fuel filter was replaced last weekend as I had a spare.

Can’t comment on the age of the (genuine) coils. But given they are numbered they have been in for longer than the plugs.

Regarding the fuel pressure sensor - it that something I can log with Vida to check performance of?

MisterGee19 · May 29th, 2021, 12:30

Quote:

Originally Posted by T5R92011

Bad fuel pressure sensor (on the end of the fuel rail) can cause the hesitency.

These are fairly cheap to buy and easy to replace. My last T5 I noticed one morning that throttle response had developed a very slight delay for the engine RPM to raise, and the need to push a bit harder to do so.

New pressure sensor fitted fixed the issue. They are about £30 these days, bosch ones, on ebay. These sensors are worth changing at higher mileage anyway so I'd say try that first.

Good shout on the Fuel pressure sensor..
Just gone out to get some logs and can see this when it stutters... fuel pressure reading goes waaaay up, and the ecu drops the duty cycle.

MisterGee19 · Jun 13th, 2021, 07:09

Just to update this - fuel pressure sensor replaced with a Bosch sensor from ebay and the car has been behaving.

I do seem to still have a very slight fluttery stumble at very low throttle openings and a ecm120d maf flow too low code so think I have a vac leak somewhere or a dying maf.

May 28th, 2021, 18:58	#1
MisterGee19 Member Last Online: Mar 26th, 2024 21:43 Join Date: Sep 2019 Location: manchester	2.4T5 - Intermittent stutter/misfire. My 2005 2.4 T5 has been well behaved until recently. Last couple of weeks ago i was travelling on the mway at a steady 70ish and the car started to misfire and hesitate intermittently.. it did it 3 or 4 times and only for a second or two each occasion since then its done it very occasionally, during light throttle/steady state but very very intermittently. 99.5% of the time its fine, giving it the boot and it still goes like a rocket (its got an MTE remap) As I knew i had a weak battery, that has been replaced last weekend and codes cleared in case that was causing issues.. but it has not solved the issue. I have been checking with vida, and there are no codes giving any indication of an issue. Does anyone have any suggestions about where to start looking? - Dont really want to start firing the parts cannon at it just yet....

May 29th, 2021, 00:20	#4
T5R92011 FCW Auto Service Last Online: Yesterday 19:19 Join Date: Feb 2015 Location: Gloucester	Bad fuel pressure sensor (on the end of the fuel rail) can cause the hesitency. These are fairly cheap to buy and easy to replace. My last T5 I noticed one morning that throttle response had developed a very slight delay for the engine RPM to raise, and the need to push a bit harder to do so. New pressure sensor fitted fixed the issue. They are about £30 these days, bosch ones, on ebay. These sensors are worth changing at higher mileage anyway so I'd say try that first. __________________ FCW Auto Service (Gloucester) https://www.fcw-autoservice.com

May 28th, 2021, 22:03	#2
Simmy Premier Member Last Online: Today 11:19 Join Date: Mar 2017 Location: Manchester	how old are your spark plugs and leads?

May 29th, 2021, 00:10	#3
jason11 Junior Member Last Online: May 28th, 2024 19:43 Join Date: Jun 2010 Location: pershore	Fuel filter.?

May 29th, 2021, 06:57	#5
MisterGee19 Member Last Online: Mar 26th, 2024 21:43 Join Date: Sep 2019 Location: manchester	So the plugs were replaced in 2018 - genuine Volvo. the car has done less than 5k miles since then. Fuel filter was replaced last weekend as I had a spare. Can’t comment on the age of the (genuine) coils. But given they are numbered they have been in for longer than the plugs. Regarding the fuel pressure sensor - it that something I can log with Vida to check performance of?

Jun 13th, 2021, 07:09	#7
MisterGee19 Member Last Online: Mar 26th, 2024 21:43 Join Date: Sep 2019 Location: manchester	Just to update this - fuel pressure sensor replaced with a Bosch sensor from ebay and the car has been behaving. I do seem to still have a very slight fluttery stumble at very low throttle openings and a ecm120d maf flow too low code so think I have a vac leak somewhere or a dying maf.

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