General: 70: - exhaust backfire

jack taylor · Jul 13th, 2018, 15:35

Hi, I have a 1998 V70, 2.5, 20v petrol.Last year a new cat and exhaust were fitted together with a PCV kit. Recently the exhaust has started popping/backfiring when I lift off the accelerator.I have yet to clean the throttle body and fit a new rear silencer. Research on here indicates that excess fuel might be the cause of the popping but I dont know which part of the engine would cause the excess fuel. I would appreciate help please. thanks.

DunkinBiskits · Jul 13th, 2018, 16:00

dont worry about it mate if its below 15/1600 rpm. its idle fuel just hitting a hot exhaust and getting air from there rather than through the inlet as throttle plate is pretty much shut.

if its higher up the rpm then check your TPS is returning to 0%

jack taylor · Jul 13th, 2018, 16:32

Hi DunkinBiskits, thanks very much for the info. Please excuse my ignorance but I dont know what " 5/ 1600" means. thanks jack.

DunkinBiskits · Jul 13th, 2018, 17:02

RPM Jack, 1500/1600 rpm

jack taylor · Jul 13th, 2018, 17:10

Thanks very much mate; most grateful.

Jul 13th, 2018, 15:35	#1
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	exhaust backfire Hi, I have a 1998 V70, 2.5, 20v petrol.Last year a new cat and exhaust were fitted together with a PCV kit. Recently the exhaust has started popping/backfiring when I lift off the accelerator.I have yet to clean the throttle body and fit a new rear silencer. Research on here indicates that excess fuel might be the cause of the popping but I dont know which part of the engine would cause the excess fuel. I would appreciate help please. thanks.

Jul 13th, 2018, 16:00	#2
DunkinBiskits Master Member Last Online: Jan 1st, 2024 13:30 Join Date: Nov 2016 Location: Merseyside	dont worry about it mate if its below 15/1600 rpm. its idle fuel just hitting a hot exhaust and getting air from there rather than through the inlet as throttle plate is pretty much shut. if its higher up the rpm then check your TPS is returning to 0% __________________ 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; Jul 13th, 2018 at 16:05.

Jul 13th, 2018, 17:02	#4
DunkinBiskits Master Member Last Online: Jan 1st, 2024 13:30 Join Date: Nov 2016 Location: Merseyside	RPM Jack, 1500/1600 rpm __________________ https://www.facebook.com/VolvoComposites/ Horsepower is how fast you hit the wall Torque is how far you take the wall with you

Jul 13th, 2018, 16:32	#3
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	Hi DunkinBiskits, thanks very much for the info. Please excuse my ignorance but I dont know what " 5/ 1600" means. thanks jack.

Jul 13th, 2018, 17:10	#5
jack taylor Master Member Last Online: May 15th, 2022 15:53 Join Date: Jan 2008 Location: Torrenueva, Costa del Sol	Thanks very much mate; most grateful.

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