Volvo AWD S70 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 1/2017 S70 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE    PRINT   SAVE 

ETS and high octane gasoline S70

posted by  MFahsel on  Sun Feb 6 07:49 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Sun Jun 10 15:20 CST 2012
[RELATED]

My ETS light has been coming on regularly and I understand that I'll need a new control unit in the near future. My question is this: Is there any connection between using high octane fuel (93 Octane) and the throttle body? The reason I ask this question is, it seems that when I use the higher octane fuel, the ETS light stays off and the car runs smoother than when I use regular gasoline. Is this just a conincidence or is there a connection?








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    ETS and high octane gasoline S70

    posted by  joe knows on  Tue Feb 8 13:45 CST 2005
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

    i was just reading this and other responses,low octane gas in these particular cars causes carbon build up in the eng.ie;valves rings etc. your crankcase ventilation is responsible for getting rid of some of it.where does the crank case vent to?thats more theory than fact,however the ones ive had to replace on customers cars,for some reason most of the time have been people who run low grade gas or dont get reg service.good luck.








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    ETS and high octane gasoline S70

    posted by  someone claiming to be Andy on  Sun Feb 6 08:52 CST 2005 [RELATED]

    I've seen a couple posts here about a correlation between fuel and the electronic throttle body. Its something I'd like to see explained in more depth becase the throttle body is no where near the fuel. Fuel is injected into the intake manifold way downstream of the the throttle body.

    The only thing that passes through the throttle body is air.








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      ETS - Crankcase ventilation involved? S70

      posted by  Erik A on  Sun Feb 13 03:46 CST 2005
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Mon Aug 31 10:16 CST 2009
      [RELATED]

      A good point, I guess the air has to be quite badly polluted to explain the contamination..? And why isnt the dirt trapped in the air filter then?

      According to a Volvo mechanics here, cleaning solves many of the ETM cases (but obviously not all) so the contamination seems to be the main issue.
      As far as I understand, the crankcase ventilation passes through the throttle body. Could it be crankcase fumes that are causing the problem? If so I guess both oil quality and oil change interval could be involved. The amount of crankcase fumes would probably increase considerably as the engine gets worn?

      Or is it simply combustion fumes flowing backwards when the engine is stopped? I have seen "gumming" in the carburettor on some cars I have had. The gumming was above the fuel nozzles so I find it hard to believe it was caused by the fuel. I have always thought it was caused by combustions fumes when turning off but maybe crankcase fumes is a better guess?

      Any thoughts?
      Rgds
      Erik







    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      ETS and high octane gasoline S70

      uid 4751's pic
      posted by  MittenHed on  Sun Feb 6 17:01 CST 2005
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Thu Oct 23 02:03 CST 2014
      [RELATED]

      True, in theory. Take yours apart some time, and explain how all that black stuff came out of the air...
      --
      01 V70 2.4 M5 and a Mini








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        ETS and high octane gasoline S70

        posted by  someone claiming to be Andy on  Mon Feb 7 15:54 CST 2005 [RELATED]

        Air is full of crap and gunk, fuel would actually clean it a bit. I'd wager that there also a contribution of minor amounts of oil mist from the turbo bearings.








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    Doubt it S70

    posted by  jda2000 on  Sun Feb 6 08:17 CST 2005
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Sun Jan 1 21:27 CST 2012
    [RELATED]

    What kills the ETS module is heat and gunk that accumulates in the throttle body. So it's possible that running cheap regular gas would lead to more gunk accumulation, but I doubt it.

    Remove your TB/ETS module and give it a good cleaning. Then run high octane quality gas and see what happens. You have nothing to loose and lots to gain.
    --
    '88 240, '92 745, '98 v70 John, Tampa Bay








    •   REPLY TO THIS MESSAGE    PRINT   SAVE 

      Doubt it S70

      posted by  jpryb on  Mon Feb 7 05:22 CST 2005
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS] [RELATED]

      I thought I saw an authoritive post in which someone did a failure analysis on a failed throttle body unit. He found that the failure was due to wearing away of the resistive material used in the potentiometer (a variable resistor), which electrically controls the throttle body. There is a "wiper" that moves across the potentiometer when you step on your accelerator pedal. Every time you step, it wipes across the surface of this resistive material. Over time, the material wears away, and voila - ETS failure.

      If this is the case, then it has nothing to do with the stuff flowing through throttle body, since the potentiometer has no idea what kind of gas you are using. I suggest that your observation is just a coincidence, and the potentiometer material will shortly wear away so much that your throttle won't work at all.

      Keep good walking shoes in the car.








      •   REPLY TO THIS MESSAGE    PRINT   SAVE 

        Doubt it S70

        posted by  someone claiming to be Andy on  Mon Feb 7 15:53 CST 2005 [RELATED]

        http://www.brickboard.com/AWD/index.htm?id=884279







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

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.