IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy your stuff using this and it helps MVS!

1998 V70 T5; problem hot starting & occasional brief power loss at speed

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

Post Reply
clifford06
Posts: 341
Joined: Thu Aug 01, 2013 5:03 pm
Year and Model: 2000 T5
Location: texas
Has thanked: 6 times
Been thanked: 4 times
United States of America
clifford06

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Tue Sep 17, 2019 2:48 pm

Did a test drive today . Got the engine to normal temp . Wouldn't restart . Jumped the relay and still no start . Losing my patience !!



User avatar
erikv11
Posts: 9372
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 72 times
Been thanked: 228 times
United States of America
erikv11

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by erikv11 » Tue Sep 17, 2019 5:41 pm

There's also the gray fuel injection main relay up under the radiator - or maybe that relay is not used on a 98? My 98 is not here or I would check. Someone else will remember.

It's basically guaranteed to be an electrical/electronic part, that when it heats up the resistance gets too high. V = IR so currrent drops and the component stops working and the car stops working. Could be a relay, sensor, or a critical wire that is thin or poorly connected.

Did you yet check if the positive battery cable heats up under usage? Right at the positive terminal, common problem.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

clifford06
Posts: 341
Joined: Thu Aug 01, 2013 5:03 pm
Year and Model: 2000 T5
Location: texas
Has thanked: 6 times
Been thanked: 4 times
United States of America
clifford06

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Wed Sep 18, 2019 4:58 pm

If its the battery cable , would the problem be in the section that connects to the fuse box ? I do recall a good indy shop before this issue , saying positive cable had corrosion . Also, what does the smaller wire on the + cable connect to ? Thinking of picking up a cable from Autozone and see what happens. Thanks !



clifford06
Posts: 341
Joined: Thu Aug 01, 2013 5:03 pm
Year and Model: 2000 T5
Location: texas
Has thanked: 6 times
Been thanked: 4 times
United States of America
clifford06

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Wed Sep 18, 2019 5:15 pm

I just looked in my main fusebox, and the end of the wire that is bolted down is covered with " white battery acid " . Is this where the four wire cable that is bolted to my positive battery connector runs to ? If so, couldn't I just replace it with section of battery cable ?



User avatar
erikv11
Posts: 9372
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 72 times
Been thanked: 228 times
United States of America
erikv11

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by erikv11 » Wed Sep 18, 2019 5:19 pm

On a 98 the problem is usually the main cable where it connects to the lug, the main cable that runs down to the starter. And you can feel the cable near the lug gets hot to the touch when you run the car, there is no mistaking it. I'd check it before buying a cable.

FYI you can't just remove the positive cable to the starter, as it is integrated into the wiring harness. You have to leave the old cable in the vehicle and run a new one. Lots of posts on this site of people making new positive cables by various methods, or some examples of just grabbing one from Autozone.

The smaller 4-wire cable connects to the fuse box. That cable is very problematic on 99-00 cars but much less so on a 98. Still worth checking out - it will get hot if it is corroding.

OK now I am seeing your most recent reply too ... you can replace that cable to the fuse box but accessing the lug in the fuse box is something of a PITA. I might start with cleaning up all the cable ends well, see if that alleviates the problem.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

clifford06
Posts: 341
Joined: Thu Aug 01, 2013 5:03 pm
Year and Model: 2000 T5
Location: texas
Has thanked: 6 times
Been thanked: 4 times
United States of America
clifford06

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Wed Sep 18, 2019 6:39 pm

The lug on my car sits on top . Putting a wrench on bolt the may be a PITA , just like owning this car ! I'll try tomorrow. If it solves my problem I no problem about rigging up a new cable.



User avatar
abscate
MVS Moderator
Posts: 19244
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 232 times
Been thanked: 767 times
Trinidad & Tobago
abscate

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by abscate » Wed Sep 18, 2019 6:56 pm

Make sure you disconnect the negative cable first. If you touch the wrench to a metal surface, you can weld it to the metal, and then watch it burn up your car. Very unpleasant.

Disconnect negative
Tighten positive
Reconnect negative


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

clifford06
Posts: 341
Joined: Thu Aug 01, 2013 5:03 pm
Year and Model: 2000 T5
Location: texas
Has thanked: 6 times
Been thanked: 4 times
United States of America
clifford06

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Wed Sep 18, 2019 7:16 pm

Will do ! Hooking up wrong would definitely leave a bruise ! Thanks



clifford06
Posts: 341
Joined: Thu Aug 01, 2013 5:03 pm
Year and Model: 2000 T5
Location: texas
Has thanked: 6 times
Been thanked: 4 times
United States of America
clifford06

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by clifford06 » Thu Sep 19, 2019 5:25 pm

Well , the fuse box + battery cable is pretty corroded . Bought a battery cable to replace it. I'll cut a notch to install into box. My question " What to do with the connection end of cable in fuse box ? " Tape it up , cut off ? Don't want to have a bare wire in the fuse box . There 's not much slack in it to pull it out of box . I'd appreciate if anyone who has replaced this wire to chime in on how you secured it .



User avatar
abscate
MVS Moderator
Posts: 19244
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 232 times
Been thanked: 767 times
Trinidad & Tobago
abscate

Re: 1998 V70 T5; problem hot starting & occasional brief power loss at speed

Post by abscate » Fri Sep 20, 2019 3:47 am

Let's see a picture of this bad boy.

I'll show mine first.
You do not have the required permissions to view the files attached to this post.


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

Post Reply
  • Similar Topics
    Replies
    Views
    Last post