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 anything with this and it helps MVS!

Cold weather start but won't stay running...CTS ?

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
SonicAdventure
Posts: 345
Joined: Fri Jul 03, 2015 9:43 am
Year and Model: 1996 850 wagon
Location: America
Has thanked: 17 times
Been thanked: 6 times
United States of America
SonicAdventure

Cold weather start but won't stay running...CTS ?

Post by SonicAdventure » Thu Nov 14, 2019 7:15 am

The past two days have been pretty cold here in PA, low 20’s. Coldest temps I’ve tried to operate the 850 I bought this summer.

Last night and this AM, it would start up and immediately stop. Last night it was in the 30’s but it eventually stayed running after a few tries and didn’t give any more problems.

This AM it would start right up but immediately stall after reaching 1,000 rpms. It’s 21 degrees right now.

The fact that there has been such a temperature drop and the immediate presence of this start but not stay running issue leads me to believe it’s probably CTS related as that is the only sensor that could cause a no spark condition strictly by temperate readings, right?

I have an older CTS (maybe two) from other cars which I’ve tested resistance on. However, I’m inclined to just buy a new one. What is the acceptable resistance for these anyway? I’m not getting a check engine light for CTS...would it throw one if this was for sure the issue?

It’s supposed to go up into the 40’s today, so I’m going to try again later.

Thanks

User avatar
RickHaleParker
Posts: 4519
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 578 times
United States of America
RickHaleParker

Re: Cold weather start but won’t stay running...CTS ??

Post by RickHaleParker » Thu Nov 14, 2019 7:31 am

Engine Coolant Temperature sensor (ECT).

My '98 C70 did the same a few years back. It was a Altitude sensor that crapped out when it got cold. Any sensor the the ECM uses to make Air/Fuel calculations can do the same.

Try pulling DTC codes now when the problem is active.

Leaks in the Air induction that gets worst when it is cold can do the same.
--------
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

Chuck W
Posts: 337
Joined: Wed Dec 24, 2014 10:45 am
Year and Model: 97 854 T5
Location: Indianapolis, IN
Has thanked: 22 times
Been thanked: 48 times
United States of America
Chuck W

Re: Cold weather start but won’t stay running...CTS ??

Post by Chuck W » Thu Nov 14, 2019 7:51 am

Have you checked the CTS plug for corrosion? That could be causing a false reading also.

Had this issue with my '97 T5 last winter.
'97 854 T5 - Manual swap in process (COP, "R" Brakes, 16T)
'97 855 GLT - Hers. RN swap/16T/exhaust/302s/Flashable M4.4
'78 GLE - Waiting in the wings. Future whiteblock/T5 swap.

User avatar
abscate
MVS Moderator
Posts: 21944
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 361 times
Been thanked: 1108 times
Trinidad & Tobago
abscate

Re: Cold weather start but won’t stay running...CTS ?? 9186486 ?

Post by abscate » Thu Nov 14, 2019 8:37 am

Pull the connector and check for corrosion per Chuck

Then search the forum using the part number (invented by the Mongols in 850 BC) to find the resistance chart

viewtopic.php?f=1&t=79330&p=427389&hili ... 86#p427389

I believe its 9186486 for the -1998 (for reference its 9125463 from 1999-end of P80 line)

Did you nab the one from the 1998 or do I have it? PM if you want it back

Its free

Part free
7.99 USPS small box
25 Shipping Handling
49.95 Shop supplies
7.37 Environmental Fee
$99 Core charge

:-)
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
erikv11
Posts: 9847
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 103 times
Been thanked: 312 times
United States of America
erikv11

Re: Cold weather start but won’t stay running...CTS ??

Post by erikv11 » Thu Nov 14, 2019 8:40 am

+1 on the ECT dirty connector idea. Had it on my 95 about 3 winters ago, it's a pretty common problem.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

User avatar
E Showell
Posts: 3172
Joined: Thu Oct 16, 2008 4:00 pm
Year and Model: V70R '06 AWD Auto
Location: Long Valley, N.J.
Has thanked: 35 times
Been thanked: 76 times
United States of America
E Showell

Re: Cold weather start but won’t stay running...CTS ??

Post by E Showell » Thu Nov 14, 2019 8:45 am

Spray contact cleaner followed by a very small dab of dielectric grease could be your friend under those circumstances.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

scot850
Posts: 6184
Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
Has thanked: 18 times
Been thanked: 250 times
Canada
scot850

Re: Cold weather start but won’t stay running...CTS ??

Post by scot850 » Thu Nov 14, 2019 10:08 am

Is your car an NA or turbo? There may be another issue in relation to turbo cars and cold temperatures.

Turbo engines can have an issue with the intercooler freezing.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

User avatar
SonicAdventure
Posts: 345
Joined: Fri Jul 03, 2015 9:43 am
Year and Model: 1996 850 wagon
Location: America
Has thanked: 17 times
Been thanked: 6 times
United States of America
SonicAdventure

Re: Cold weather start but won't stay running...CTS ?

Post by SonicAdventure » Thu Dec 19, 2019 3:50 am

So I got a new ECT sensor from FCP and installed it last week. Followed by a coolant flush and oil change. I put some wiring connector spray on a q-tip and cleaned the plug before putting the new ECT unit on. Also, I tested the new sensor with a multi-meter against the old one which seemed to be on the fritz (not displaying consistent readings in below freezing temps).

Car has been running fine, but it’s 16 degrees here this AM and it’s doing the same thing it was before - starts up and suddenly dies.

Not sure what to try next. I thought I had this sorted out, but it’s obviously something else. Any other clues? Also, I looked up front behind the passenger side headlight and I didn’t see a barometric sensor or the plug for one...

No CEL whatsoever for any of this, however, I know the CEL works because it indicated misfires this summer before I did my tune up.

Any thoughts?

User avatar
abscate
MVS Moderator
Posts: 21944
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 361 times
Been thanked: 1108 times
Trinidad & Tobago
abscate

Re: Cold weather start but won't stay running...CTS ?

Post by abscate » Thu Dec 19, 2019 5:15 am

Sonic, try unplugging the MAF and running the car on the default air fuel rpm map to see if that helps. That will help rule out a vacuum leak.

Are your ignition parts all new and good? Peek under the distributor cap for moisture, dirt, and other detritus.

Finally, a fuel relay can fail on a temperature change, so that’s worth investigating

Does it eventually start and run ok or are you stuck?
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
SonicAdventure
Posts: 345
Joined: Fri Jul 03, 2015 9:43 am
Year and Model: 1996 850 wagon
Location: America
Has thanked: 17 times
Been thanked: 6 times
United States of America
SonicAdventure

Re: Cold weather start but won't stay running...CTS ?

Post by SonicAdventure » Thu Dec 19, 2019 5:53 am

abscate wrote:
Thu Dec 19, 2019 5:15 am
Sonic, try unplugging the MAF and running the car on the default air fuel rpm map to see if that helps. That will help rule out a vacuum leak.

Are your ignition parts all new and good? Peek under the distributor cap for moisture, dirt, and other detritus.

Finally, a fuel relay can fail on a temperature change, so that’s worth investigating

Does it eventually start and run ok or are you stuck?
Will try the MAF test. Full tune up this summer including cap rotor wires plugs and igniter so we’re good there. When you say fuel relay do you mean fuel pump relay? I have some extras sitting around I can test with. Technically not stuck (other than my driveway) but luckily I work from home...yes once the temp gets above 30 or so, it starts fine and runs with no issues.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post