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!

96 850 not starting sometimes

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: 18829
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 731 times
Trinidad & Tobago
abscate

Re: 96 850 not starting sometimes

Post by abscate » Fri Jun 21, 2019 10:12 am

Two ways to isolate the fuel vs spark diagnostic tree

1 Measure fuel pressure with gauge. Hearing the pump is not enough, these cars need spec fuel pressure to run.

2 Starter fluid on the no start condition. Easier to implement when the no start is intermittent.

A three second shot into the air cleaner snout will give you a quick burst of running if your igntiion is good.


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

User avatar
greg850r
Posts: 263
Joined: Thu May 03, 2012 5:06 pm
Year and Model: a long list
Location: Mo
Has thanked: 4 times
Been thanked: 9 times
United States of America
greg850r

Re: 96 850 not starting sometimes

Post by greg850r » Sat Jun 29, 2019 9:41 pm

Clemens wrote:
Tue Jun 18, 2019 5:38 am
After truning over, remove a spark plug and see if it is wet or smells like fuel. If so, you might have no spark. Otherwise not enough fuel.
There is also a good chance that it is the engine coolant temp sensor. If it is faulty you might get a no start situation.
Anybody got more on the coolant temp sensor causing a no spark? I have a 96T wagon I started another thread about a few months ago and never have figured it out.

96 850 turbo no spark, most of the time

Post by greg850r » 31 Jan 2018, 09:55


05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

User avatar
abscate
MVS Moderator
Posts: 18829
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 221 times
Been thanked: 731 times
Trinidad & Tobago
abscate

Re: 96 850 not starting sometimes

Post by abscate » Sun Jun 30, 2019 4:39 am

A bad ECT will not inhibit spark but you May have more than one problem.

When was the last time the plugs cap rotor and wires were serviced?


Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

mattconrad850
Posts: 4
Joined: Sat Feb 08, 2014 2:18 pm
Year and Model: 1997 850 wagon
Location: NY USA
Has thanked: 1 time
Been thanked: 0
United States of America
mattconrad850

Re: 96 850 not starting sometimes

Post by mattconrad850 » Sun Jun 30, 2019 7:16 am

Had same issue, turned out it was my fuel filter, ran great but in the sun (strange) hot weather wouldn't start, once the outside air was cooler it would fire right up, got stranded 2x had it towed, cranked fine, tested for pressure at shrader slight surge then nothing, removed fuel feed tube and no gas in there at all, filter was full of gas, had other issues too which made finding it difficult, mostly evap issues, hoses split



User avatar
greg850r
Posts: 263
Joined: Thu May 03, 2012 5:06 pm
Year and Model: a long list
Location: Mo
Has thanked: 4 times
Been thanked: 9 times
United States of America
greg850r

Re: 96 850 not starting sometimes

Post by greg850r » Sat Jul 06, 2019 9:31 am

abscate wrote:
Sun Jun 30, 2019 4:39 am
A bad ECT will not inhibit spark but you May have more than one problem.

When was the last time the plugs cap rotor and wires were serviced?
Plugs, cap, rotor, wires, cam sensor, crank sensor, coil unit all swapped with those on a running car to no avail. I'm really chasing my tail on this one.


05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

shegarty
Posts: 252
Joined: Mon Sep 12, 2011 7:38 am
Year and Model: 1998
Location: port hope
Has thanked: 7 times
Been thanked: 2 times
Canada
shegarty

Re: 96 850 not starting sometimes

Post by shegarty » Sat Jul 06, 2019 9:58 am

Have you ruled out a fuelling issue yet? Low pressure or lack of volume could be a problem.


current - 98 S70 T5 SE (225k km)
previous - 90 745T (400k km - sold); 94 855 T5 - (206k km - blown timing idler bearing)

User avatar
greg850r
Posts: 263
Joined: Thu May 03, 2012 5:06 pm
Year and Model: a long list
Location: Mo
Has thanked: 4 times
Been thanked: 9 times
United States of America
greg850r

Re: 96 850 not starting sometimes

Post by greg850r » Sat Jul 06, 2019 5:26 pm

Fuel pressure was good and it was lacking spark the last time I was working on it.

Here's the thread from the last attempt to get it running.
viewtopic.php?t=84297


05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

User avatar
greg850r
Posts: 263
Joined: Thu May 03, 2012 5:06 pm
Year and Model: a long list
Location: Mo
Has thanked: 4 times
Been thanked: 9 times
United States of America
greg850r

Re: 96 850 not starting sometimes

Post by greg850r » Mon Jul 08, 2019 7:38 pm

I just changed wires, cap, rotor, cleaned and gapped plugs and found the ECT plug was losing connection so I took it apart and cleaned the connectors with emory cloth and removed them from their holders so I could positively attach them. While I was at it I cleaned and reattached cam and crank sensor plugs. Sprayed some starting fluid in the intake by the radiator and it popped but that's all. I went for the lawn mower syndrome and just cranked it throttle on the floor for the longest time. When I gave up and released the key it fired and revved because my foot was still on the floor. I let it run until the temp gauge moved and shut it down. Tried restart and had to crank it wide open again but it fired a little quicker this time. It ran fairly well when it quit on me but sounds pretty bad now. I think it sat too long. Valve train noise still there when warm and I bet the rings are stuck. I'm going to pop the plugs back out and add about 4oz Marvel to each cylinder and call it a night. This must have been a combination of things but as long as I have you guys to throw ideas at me I don't give up. I've let this one sit for months at a time and probably that added to the problems I had making it go. Thanks for all the suggestions guys. I'll report back in a few days after I run it in and make a few more tweaks.


05 Cross Country wagon
99 C70 Convertible
96 850R wagon
96 850T wagon
96 850 GLT 5spd N/A sedan
97 850R 5spd sedan
66 GTO 421SD 4spd
67 GTO 455 T400
02 Powerstroke 4x4
85 Yota 4x4
24' 454 Challenger
07 Softail Custom
02 Sportster Custom
Parts cars not included

Post Reply