Volvo AWD S70 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 5/2009 S70 INDEX

[<<] [>>]

THREADED

THREADED EXPANDED

FLAT

PRINT ALL

MESSAGES IN THIS THREAD

REPLY TO THIS MESSAGE

SAVE

hard to start white smoke/ temp circuit failure S70 1998

posted by dennis 850 on Mon Apr 24 06:33 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Tue Nov 13 14:21 CST 2007

[RELATED]

Hello, I just purchased a 98 S70 turbo with 109k miles on it. I have a check engine light on, so I went to my local autozone and had it scanned. It came up with 1 code, coolant circuit failure. would that be the coolant temp sensor or the coolant switch? Also, sometimes it is hard to start, I have to pump the gas and it will then start but, when it does their is a puff of white smoke out of the tail pipe. It doesn't seem to smoke any other time. Would the coolant sensor or switch have anything to with the hard start issue? I have checked the cap, rotor and plugs and they all look like they need to be replaced. there was no oil on the plugs.

Thanks!
Dennis

00 S70 T-5 82k
98 S70 Turbo 109k
85 740 145k

REPLY TO THIS MESSAGE

Replies to this message will be emailed.

SAVE

hard to start white smoke/ temp circuit failure S70 1998

posted by KlausC on Mon Apr 24 07:57 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Fri Oct 24 10:15 CST 2014

[RELATED]

You are correct, the Engine Coolant Temp sensor needs to be replaced. The fuel injection uses this info to determine amount of fuel to deliver.
The white smoke is a concern, but fix one thing at a time.
I would suggest you find an 87C/89C thermostat and replace it at the same time. Dealers only carry the hotter one.

Klaus
--
(V♂LV♂s 1975 164, 1995 854T, 1998 V70R)

REPLY TO THIS MESSAGE

SAVE

hard to start white smoke/ temp circuit failure S70 1998

posted by dennis 850 on Tue Apr 25 05:38 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Tue Nov 13 14:21 CST 2007

[RELATED]

Thanks, Klaus I have the coolant tempp sensor ordered. So, I will replace that and see what happens. When I crank it up and it cranks with no problem I am not getting the white smoke. I only get a puff of white smoke when I have to pump the gass while trying to crank it, when it doesn't want to start. I think the smoke is comeing from all the extra fuel being pumped in while trying to to get it started.

Thanks
Dennis

REPLY TO THIS MESSAGE

SAVE

hard to start white smoke/ temp circuit failure S70 1998

posted by KlausC on Wed Apr 26 04:11 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]

[IGNORE ALL POSTS]

last visit: Fri Oct 24 10:15 CST 2014

[RELATED]

If I remember correctly, white smoke = water, black smoke = oil, and blue smoke = gas. Black and blue are confusing, I can't remember which is which, but the smell is distinctive.
If you have to "pump" the gas pedal to start the car, and there is a small puff of non-white smoke coming out, you may have fuel pressure problems. After it starts, if it runs well, then it could be loss of fuel pressure overnight. That could be a result of the fuel pressure regulator breaking down and allowing fuel to enter the vacuum line and the intake manifold.
A new ECT sensor is needed, but I don't think you are out of the woods yet.

Klaus
--
(V♂LV♂s 1975 164, 1995 854T, 1998 V70R)

<< < > >>

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.