IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

98 V70 T5 rough idle after warm up, eventually stalls... Topic is solved

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

User avatar
abscate
MVS Moderator
Posts: 20521
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 289 times
Been thanked: 905 times
Trinidad & Tobago
abscate

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by abscate » Mon Jun 24, 2019 3:44 pm

That problem will come back. I doubt the pulse damper caused those symptoms.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
valvolvo70
Posts: 36
Joined: Sat Oct 13, 2018 8:39 am
Year and Model: 1998 V70 T5
Location: Michigan
Has thanked: 6 times
Been thanked: 2 times
United States of America
valvolvo70

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by valvolvo70 » Tue Jun 25, 2019 4:47 pm

abscate wrote: ↑
Mon Jun 24, 2019 3:44 pm
That problem will come back. I doubt the pulse damper caused those symptoms.
I'm typically a positive guy so I thought sharing what has worked thus far, after trying several other options, seemed to be inline with the overall helpful comments and suggestions on this site. If it goes to hell again, I'll start with your earlier recommendation$.

yeahyeah
Posts: 9
Joined: Mon Oct 01, 2018 10:02 pm
Year and Model: 2002 V70 T5
Location: WA
Has thanked: 0
Been thanked: 0
United States of America
yeahyeah

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by yeahyeah » Mon Sep 02, 2019 12:18 pm

Did the problem come back? Looking at a similar symptom on a S70

User avatar
valvolvo70
Posts: 36
Joined: Sat Oct 13, 2018 8:39 am
Year and Model: 1998 V70 T5
Location: Michigan
Has thanked: 6 times
Been thanked: 2 times
United States of America
valvolvo70

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by valvolvo70 » Mon Sep 02, 2019 2:02 pm

yeahyeah wrote: ↑
Mon Sep 02, 2019 12:18 pm
Did the problem come back? Looking at a similar symptom on a S70
Nope...

User avatar
misha
Posts: 4202
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 54 times
Been thanked: 117 times
Serbia
misha

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by misha » Fri Apr 03, 2020 4:10 pm

valvolvo70 wrote: ↑
Wed Oct 17, 2018 1:35 pm
Just replaced the thermostat and ECT...same problems...stumped. Time for a beer.
I found the topic!
So let's go back from a beginning.
Is ECT oem Volvo?
Did you checked connectors for corrosion on both sides(ect side and wiring loom side)?

Is the connector fully 'home"...is it seated properly?

Next....FPR.
'98 T5 (since you have just a damper at fuel rail) is M4.4 and fpr is at passenger's side rear wheel.
Check it's vacuum line for fuel(there should NOT be even a trace of fuel in the vacuum line).Few drips of fuel in the vacuum line are enough for misfiring,sputtering and rough idle.

When FPR is leaking in the vacuum line it's always followed with black smoke from the exhaust.

Disconnect vacuum line,cap the line from the engine side and start the car.Watch for fuel drops from vacuum line from fpr as the car runs...again...there should not be even a trace of fuel.Let it idle for 10-15 min just in case if membrane starts to leak a bit later(it happens).

About evap code....

This time i would check a purge valve which is on driver's side,mounted right besides a radiator and one vacuum line goes directly to intake manifold under the vacuum tree and idle valve(iac).
Remove the purge valve and blow through it.
It's normal state is CLOSED.
It's opened in some conditions when ecu ask for it while the car is running or idling.
So...when removed it must be closed(not able to blow through it).

Cap & rotor.

Are they oem Bosch?

This problem will need detailed inspection.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

User avatar
valvolvo70
Posts: 36
Joined: Sat Oct 13, 2018 8:39 am
Year and Model: 1998 V70 T5
Location: Michigan
Has thanked: 6 times
Been thanked: 2 times
United States of America
valvolvo70

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by valvolvo70 » Sat Apr 04, 2020 9:38 am

misha wrote: ↑
Fri Apr 03, 2020 4:10 pm
valvolvo70 wrote: ↑
Wed Oct 17, 2018 1:35 pm
Just replaced the thermostat and ECT...same problems...stumped. Time for a beer.
I found the topic!
So let's go back from a beginning.
Is ECT oem Volvo?
Did you checked connectors for corrosion on both sides(ect side and wiring loom side)?

Is the connector fully 'home"...is it seated properly?

Next....FPR.
'98 T5 (since you have just a damper at fuel rail) is M4.4 and fpr is at passenger's side rear wheel.
Check it's vacuum line for fuel(there should NOT be even a trace of fuel in the vacuum line).Few drips of fuel in the vacuum line are enough for misfiring,sputtering and rough idle.

When FPR is leaking in the vacuum line it's always followed with black smoke from the exhaust.

Disconnect vacuum line,cap the line from the engine side and start the car.Watch for fuel drops from vacuum line from fpr as the car runs...again...there should not be even a trace of fuel.Let it idle for 10-15 min just in case if membrane starts to leak a bit later(it happens).

About evap code....

This time i would check a purge valve which is on driver's side,mounted right besides a radiator and one vacuum line goes directly to intake manifold under the vacuum tree and idle valve(iac).
Remove the purge valve and blow through it.
It's normal state is CLOSED.
It's opened in some conditions when ecu ask for it while the car is running or idling.
So...when removed it must be closed(not able to blow through it).

Cap & rotor.

Are they oem Bosch?

This problem will need detailed inspection.
I'll run through this list on my T5 and then respond to your questions, thank you for your detailed list!

User avatar
valvolvo70
Posts: 36
Joined: Sat Oct 13, 2018 8:39 am
Year and Model: 1998 V70 T5
Location: Michigan
Has thanked: 6 times
Been thanked: 2 times
United States of America
valvolvo70

Re: 98 V70 T5 rough idle after warm up, eventually stalls...

Post by valvolvo70 » Sun Apr 05, 2020 4:54 pm

UPDATE:
Removed purge/EVAP valve and could blow right through it, should be closed. Found a post here on "how to clean EVAP" and sprayed throttle body cleaner until all the black gunk stopped running out each end. Some recommended taking the valve apart, I didn't. Blew through the valve again, it was closed, reassembled valve. Tried to start several times and it only turned over. On the final try there's a loud POP (fire cracker) and smoke billowing from behind/below the engine block, looked like a magic trick in my garage. Oil (spray) was forced from under the oil cap onto the plugs, and after removing the cap, there was smoke inside the block. First thought was I didn't wait long enough for the TB cleaner to evaporate before starting? or......its toast.

I haven't tried to start it again until I here recommendations as to the next steps, if any.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post