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308 odometer moves while not moving

Discussion in 'Technical Q&A' started by stephenofkanza, Jun 4, 2005.

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  1. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
    542
    Kansas
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    Stephen LeRoy Sherma
    #1 stephenofkanza, Jun 4, 2005
    I know my speedometer is fast ( I have to go close to 78 to be doing 70, I use the tach at 4k in 5th and it seems to be a common problem for 308.
    I have seen several threads on this.
    But I have noticed (when warming the engine for 15 minutes, on days that the weather is NOT Ferrari friendly, that the odometer is registrating a couple of tenths and I am not moving, nor the car is in gear.
    Has anybody else experienced this?
    Thanks

    stephen
     
  2. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    May 4, 2001
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    #2 Dr Tommy Cosgrove, Jun 4, 2005
    You mean the odometer is actually rolling over when it is sitting still?
     
  3. ArtH

    ArtH Rookie

    May 16, 2005
    47
    N. Virginia
    #3 ArtH, Jun 4, 2005
    Well isn't this why we buy Ferraris? "They look like they're going fast even when parked".

    Thus: "It's a feature, not a problem" -- to mis-quote Microsoft.

    I don't have any ideas except to wonder if the speedo is driven off of some intermediate shaft in these cars, or could it just be vibration?

    Art
    New 79 308
     
  4. Darolls

    Darolls F1 Veteran
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    #4 Darolls, Jun 4, 2005
    The speedo is driven electronically, by an impulse generator.

    How the odo can be acquiring mileage while the car is static, is beyond me.

    Does the mileage show correctly when the car is moving?

    Also, why are you "warming the engine for 15 minutes, on days that the weather is NOT Ferrari friendly"?
     
  5. Kram

    Kram Formula Junior

    Jul 3, 2004
    867
    Park bench, Canada
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    Mark
    #5 Kram, Jun 4, 2005
    It’s amazing what machines can do - against design specifications.
    The only thing I can think of is that the drum with the 1/10s on it has a light spot -perhaps caused by a missing tooth. When parked and running the engine’s vibrations cause the drum to rotate so that the heavy side - opposite the missing tooth - is pointing down.
    The missing tooth could be caused by someone trying to alter the milage with a jeweler's screwdriver.

    Hey, I said it’s a guess.
     
  6. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
    542
    Kansas
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    Stephen LeRoy Sherma
    #6 stephenofkanza, Jun 5, 2005
    Yes, the odometer moves 2 tenths while the car is not moving in neutral in 15 minutes.
    I try to drive at least once a week. Weather and road work prevented my
    weekly drive, so as it was past 2 weeks I decided to run the engine at least
    15 minutes. The speedometer also a slight amount of speed.
    When driving the speed error keep my attention ( in Kansas to make up for
    budget shortcomings and not raising taxes yhey have tripled fines - couple of
    friends have paid $150 each for 7 miles over.) . That combined with the 11%
    error with the speedometer it is hard to say.
    I thought the wheel tire combo was the cause of the speed error until
    I found out they were 390's not 15".
    I have read that the sending unit could be the cause of speed errors.
    I was wondering if it could cause odometer errors too?

    stephen
     
  7. geekstreet

    geekstreet Karting

    Feb 7, 2005
    220
    Sydney
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    Cam
    #7 geekstreet, Jun 5, 2005
    Check the archives - this problem came up a few weeks ago. I think it is due to an electrical fault generating input to the odo unit. As you say, it's not mechanical, so the electrical gremlins can have fun.
     
  8. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #8 Dr Tommy Cosgrove, Jun 5, 2005
    I just know there are some people out there who will have a fit knowing that their 3000 mile garage queen 308 can actually roll up miles just sitting still! I can almost hear wires being yanked off sending units as I type this.
     
  9. Darolls

    Darolls F1 Veteran
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    #9 Darolls, Jun 5, 2005
    Not a good idea!

    If you're not going to drive it, don't start it.

    Sorry I can't help you with the 'Ghost' mileage.
     
  10. stephenofkanza

    stephenofkanza Formula Junior

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    #10 stephenofkanza, Jun 6, 2005
    I thought running it for at least 15 minutes was better than let it set.
    I have seen threads to drive at least once a week. I have a limit of 2000
    miles a year on the insurance and a $ limit of 1500 miles a year until shes paid for. That would bring me up 45,000 maint. I had the belts done when I bought her at 39950. Regretably I have 1/4 mile of gravel country road between me and the highway. There are times in the winter the road is not passable unless you are in a truck for a month at a time. She is not a low
    milage trailer queen but I try to protect her from the elements and road rash.

    stephen
     
  11. Ken

    Ken F1 World Champ

    Oct 19, 2001
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    #11 Ken, Jun 6, 2005
    I thought that too but have now realized it's not true. The condensation in the exhaust system, oil, etc. needs driving the car to evaporate away. Plus, you'll be fouling the plugs and getting deposits on the valves. What the car needs is to be at temp. then driven HARD every now and then to keep the internals clean. I regularly rev it high now and the engine is much better off for it.

    Ken
     
  12. Verell

    Verell F1 Veteran
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    May 5, 2001
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    Verell Boaen
    #12 Verell, Jun 6, 2005
    Ken's right on,
    It's OK for the car to sit undriven over the winter. It's OK to drive it hard enough to cook all moisture out of the exhaust, oil, etc.

    Sitting idling is NOT ok, you get condensation in oil & exhaust, build carbon up inside heads & piston crowns.

    Search the bodies of posts in the archives for 'winter' & 'storage'. Several good posts in old fchat archives.
     
  13. enjoythemusic

    enjoythemusic F1 World Champ

    Apr 20, 2002
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    #13 enjoythemusic, Jun 6, 2005
    Last edited by a moderator: Sep 7, 2017
    No no. Just jack up the car's rear tires, put her in reverse, and watch the miles disappear :)
    Image Unavailable, Please Login
     
  14. stephenofkanza

    stephenofkanza Formula Junior

    Mar 5, 2005
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    Stephen LeRoy Sherma
    #14 stephenofkanza, Jun 6, 2005
    Thanks guys!

    Now define 'driven hard'.
    I normaly don't go above 6K.
    I have got a 1986 Porsche 944 Turbo and they told me If I ran it at 5K
    the engine would last forever. It has a RED LINE at 6500,
    so I just adjusted 308 to 6K. I was hoping to cut down on valve gude wear
    since I understand they are 'soft'.
    The shifting gate is still take getting used to.
    I have an 89 Geo Metro that I hammer and nobody notices.
    The Porsche (same shift pattern) I get attention.
    The 308 looks good sounds good and draws attention without the engine even running. When I am driving I don't abuse the brakes or the engine.

    stephen
     
  15. jimangle

    jimangle F1 Rookie

    Nov 5, 2003
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    #15 jimangle, Jun 6, 2005
    My speedometer occasionally bounces around when I'm sitting still and idling, and the odometer rolled as well. My Jag xjs v12 did the same thing. It's the damn electronic speedos. Since the speedometer needle won't start to move until 10mph and above, your speedo is probably moving at 5mph or slower therfore making your odometer roll slowly. To me, it's no big deal, so I haven't done anything about it. It happens once in a blue moon. It could be a power spike from somewhere.
     
  16. f355spider

    f355spider F1 World Champ
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    May 29, 2001
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    #16 f355spider, Jun 7, 2005
    Check the archives, but you may be in need of a new speedometer sender. Also check the grounds on the speedometer itself. Make sure the ground wires are clean and tight.
     

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