1995 960 misfire 3ltr

krismorgan · Feb 3rd, 2021, 12:44

Hi guys/gals.
Recently had a low rpm misfire,changed plugs,coilpacks-even changed the inlet gasket(common fault i read) to no avail.So as i was really annoyed i went for an italian tune and got home to a trail of baffle material hanging out of the tailpipe.Pulled as much out as possible(prev owner had put spurious mid and end exhaust on).Obviously a blockage in there.
My question is would the collapsing baffles cause the misfire?
I did buy an obd2 reader but it will not work(boots up fine on my sons punto).
cheers

360beast · Feb 3rd, 2021, 13:33

Quote:

Originally Posted by krismorgan

Hi guys/gals.
Recently had a low rpm misfire,changed plugs,coilpacks-even changed the inlet gasket(common fault i read) to no avail.So as i was really annoyed i went for an italian tune and got home to a trail of baffle material hanging out of the tailpipe.Pulled as much out as possible(prev owner had put spurious mid and end exhaust on).Obviously a blockage in there.
My question is would the collapsing baffles cause the misfire?
I did buy an obd2 reader but it will not work(boots up fine on my sons punto).
cheers

These aren't OBD2 you need a code reader specific for these cars, I know LokiGLT makes them for the 940 but don't know if the 960 will be the same.

TonyS9 · Feb 3rd, 2021, 13:39

Not sure on the 3ltr, but I do know it uses a 2x3 channel ignition amp, these do faulty on occassion. I'm using 1 on my wasted spark redblock.

Is there any temperature or time characteristic? Does the rev counter seem steady?

Do you have spark checkers? Would be good to see if its a specific bank or cylinder.

TonyS9 · Feb 3rd, 2021, 13:46

Quote:

Originally Posted by 360beast

These aren't OBD2 you need a code reader specific for these cars, I know LokiGLT makes them for the 940 but don't know if the 960 will be the same.

The later 960s are OBDII, thats how they sold them in the US after 96. The 940 wasn't upgraded and Volvo either didn't understand what was happening or failed to accomplish it on the LH2.4 even after fitting the OBDII socket in 96 on 940s as they were not sold in the US after 95 when ODBII became mandatory.

Perhaps early pre96 960s are also not ODBII compliant?

krismorgan · Feb 3rd, 2021, 14:51

rev counter is fine and working ok.

Laird Scooby · Feb 3rd, 2021, 17:52

The blocked exhaust will cause problems. Also try adding 0.5L of synthetic ATF to the engine oil to free of sticky hydraulic lifters, a common cause of misfires on cars so fitted.

You will need to reset the fault codes, OBD won't work on a 1995 car as it's not OBD, despite appearances.

On a 940 you can reset the codes by pulling fuse #1 for 30 seconds or so, not sure on the 960 though as they have a different fusebox i think.

Dippydog · Feb 3rd, 2021, 20:14

My '95 960 has two "boxes" in the engine bay-passenger side near to bulkhead/scuttle-which as I understand it flashes out codes?

krismorgan · Feb 3rd, 2021, 23:51

Quote:

Originally Posted by Dippydog

My '95 960 has two "boxes" in the engine bay-passenger side near to bulkhead/scuttle-which as I understand it flashes out codes?

mine is the 95 model but is the s90 shape,my older 960 had the 2 boxes,this has an obd reader socket in the center console.

krismorgan · Feb 3rd, 2021, 23:52

Quote:

Originally Posted by Laird Scooby

The blocked exhaust will cause problems. Also try adding 0.5L of synthetic ATF to the engine oil to free of sticky hydraulic lifters, a common cause of misfires on cars so fitted.

You will need to reset the fault codes, OBD won't work on a 1995 car as it's not OBD, despite appearances.

On a 940 you can reset the codes by pulling fuse #1 for 30 seconds or so, not sure on the 960 though as they have a different fusebox i think.

I am pulling the back box off tomo to check,and i will add the atf too,nice heads up,thanks

krismorgan · Feb 4th, 2021, 12:27

Great news,i did the atf trick and pulled rear box off(clogged up),cut a square flap in the top and it had rotted inside totally,cleaned it out and welded the flap up(it will do till next mot).
Fired straight up and back to smooth tickover and how it was before

As for the obd2 i checked fusebox and the fuse for alarm/diagnostics was missing-put in a fuse and all hazards came on(prev owner said alarm was disconnected) but also the obd reader booted up,no codes woohoo.

Many thanks all for the help and advice.

Feb 3rd, 2021, 17:52	#6
Laird Scooby Premier Member Last Online: Today 00:28 Join Date: May 2012 Location: Lakenheath	The blocked exhaust will cause problems. Also try adding 0.5L of synthetic ATF to the engine oil to free of sticky hydraulic lifters, a common cause of misfires on cars so fitted. You will need to reset the fault codes, OBD won't work on a 1995 car as it's not OBD, despite appearances. On a 940 you can reset the codes by pulling fuse #1 for 30 seconds or so, not sure on the 960 though as they have a different fusebox i think. __________________ Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........

Feb 3rd, 2021, 12:44	#1
krismorgan Junior Member Last Online: Aug 24th, 2022 09:15 Join Date: Oct 2017 Location: birmingham	1995 960 misfire 3ltr Hi guys/gals. Recently had a low rpm misfire,changed plugs,coilpacks-even changed the inlet gasket(common fault i read) to no avail.So as i was really annoyed i went for an italian tune and got home to a trail of baffle material hanging out of the tailpipe.Pulled as much out as possible(prev owner had put spurious mid and end exhaust on).Obviously a blockage in there. My question is would the collapsing baffles cause the misfire? I did buy an obd2 reader but it will not work(boots up fine on my sons punto). cheers

Feb 3rd, 2021, 13:39	#3
TonyS9 Premier Member Last Online: Apr 9th, 2024 21:44 Join Date: Jul 2009 Location: Holywood	Not sure on the 3ltr, but I do know it uses a 2x3 channel ignition amp, these do faulty on occassion. I'm using 1 on my wasted spark redblock. Is there any temperature or time characteristic? Does the rev counter seem steady? Do you have spark checkers? Would be good to see if its a specific bank or cylinder.

Feb 3rd, 2021, 14:51	#5
krismorgan Junior Member Last Online: Aug 24th, 2022 09:15 Join Date: Oct 2017 Location: birmingham	rev counter is fine and working ok.

Feb 3rd, 2021, 20:14	#7
Dippydog Premier Member Last Online: Apr 25th, 2024 17:55 Join Date: Jun 2016 Location: S****horpe	My '95 960 has two "boxes" in the engine bay-passenger side near to bulkhead/scuttle-which as I understand it flashes out codes?

Feb 4th, 2021, 12:27	#10
krismorgan Junior Member Last Online: Aug 24th, 2022 09:15 Join Date: Oct 2017 Location: birmingham	Great news,i did the atf trick and pulled rear box off(clogged up),cut a square flap in the top and it had rotted inside totally,cleaned it out and welded the flap up(it will do till next mot). Fired straight up and back to smooth tickover and how it was before As for the obd2 i checked fusebox and the fuse for alarm/diagnostics was missing-put in a fuse and all hazards came on(prev owner said alarm was disconnected) but also the obd reader booted up,no codes woohoo. Many thanks all for the help and advice.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)