Technical question Cold/hot start QV | FerrariChat
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Technical question Cold/hot start QV

Discussion in '308/328' started by johnk..., Jun 23, 2016.

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  1. johnk...

    johnk... F1 World Champ
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    Jun 11, 2004
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    John Kreskovsky
    #1 johnk..., Jun 23, 2016
    I don't usually ask for assistance and in fact I think I know the problem here but would like to here others chime in. The car, 1985 308 GTB QV. The problem, warm start. Symptom. When dead cold starts fine. Once up to temperature, if shut off and attempt to restart, say 15 minutes later, starts right up. Let is sit for a few hours, so it's still warm but not hot, car will fire and die. To start I must keep cranking and crack the pedal a hair. Also noticed a couple of drips of gas on frame by fuel pump or accumulator. I haven't gotten under the car yet but this seems like a typical accumulator problem. What's the consensus?
     
  2. Crowndog

    Crowndog F1 Veteran

    Jul 16, 2011
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    Robert
    #2 Crowndog, Jun 23, 2016
    Seems like you answered your own question. One of the symptoms of a bad accumulator is gas dripping out the vent nipple at the bottom. Good luck.


    Sent from my iPhone using Tapatalk
     
  3. johnk...

    johnk... F1 World Champ
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    #3 johnk..., Jun 23, 2016
    Yes, based on stuff I have read here on Chat that is what I figured. But, to be honest, I've owned the car for 31 years and this is the first problem it has had. So, I haven't had the opportunity to learn much about DIY repairs. It's been like a Honda. Get in, turn the key and drive. Lucky I guess.

    Thanks for the reply.
     
    BizJetGuy likes this.
  4. braq

    braq Karting

    Mar 29, 2010
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    Paul XXXcX
    #4 braq, Jun 23, 2016
    Those were the symptoms on mine, and they went with the accumulator replacement.
    It is a typical part for kjet cars, so mine was a mb r107 part no, cheers braq
     
  5. SeattleM5

    SeattleM5 Formula 3
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    Ettore Palazzo
    #5 SeattleM5, Jun 23, 2016
    Last edited: Jun 23, 2016
    Hot start issues often result from the inability to hold residual pressure after engine shut off. The most accurate method for determining if this is your issue is to check fuel pressures after shut off. I'm not sure what the 308 QV WSM says, but for the 328 residual pressure should remain above 2.6 Bar after 20 min. The accumulator is often the culprit as the internal rubber diaphragm fails. The tell tale sign is leakage of fuel out the back side orifice of the accumulator which it sounds like you may be experiencing. Is your 308 a US or non US version? US versions have a hose on the posterior accumulator nipple such that if the accumulator fails, fuel is directed back to the left side fuel tank. Non US versions have no such hose so when the internal diaphragm fails fuel leaks directly out the backside of the accumulator on the ground. Note that along with a failed accumulator, leaky fuel injectors and failure of the internal o ring on the fuel distributor primary pressure regulator can cause hot start issues for the same reason, i.e. insufficient residual pressure after shut down.

    Sent from my SM-G900V using Tapatalk
     
  6. johnk...

    johnk... F1 World Champ
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    #6 johnk..., Jun 24, 2016
    Thanks for the replies. I have to get under the car and confirm that the drips are from the accum, but seems pretty evident that it is the likely problem.
     
  7. mike32

    mike32 F1 Veteran

    May 13, 2016
    5,968
    Isle of man- uk
    #7 mike32, Jun 24, 2016
    Just jack up the RH side and take the rear right wheel off, remove the wheel liner and it is straight in front of you on the right, assuming it is the same as the mondial.
     
  8. David Lind

    David Lind Formula 3

    Nov 19, 2008
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    #8 David Lind, Jun 24, 2016
    ... and some fuel will come out, possibly a very short spray, so have a pan ready. And make sure the battery shut off is engaged so you have no hot wires when this fuel is escaping.
     
  9. robo330

    robo330 Formula Junior

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    #9 robo330, Jun 24, 2016
    Just went through the same issue on my 85 308QV! Check the thread on "Hot Start" problems "robo330". Long story short, it was a couple of things. First the Accumulator was not holding pressure and needed to be replaced. Second, the Primary Pressure Regulator that is screwed into the Fuel Distributor needed new "O" Rings (large one is a O Ring, smaller is a Disc, really a O Ring with flats and a new Crush Washer. Larry Fletcher at CIS Flow Tech helped me out). Lastly, my Control Pressure Regulator (also known as a Warm Up Regulator or WUR) had been taken apart and incorrectly re-assembled. The Bi-metallic element was not functioning correctly. This might all sound a little complicated, but, if you read Carl Rose's "Ferrari 328 CIS Fuel Pressure Check, July 2004, it will make more sense. I would suggest you replace the Fuel Accumulator (about $200 depending where you buy it), and if the problem goes away, you OK. If it persists, do a Fuel Pressure Check. That will indicate where else there may be an issue with the system. Come back to the site, and someone will advise you further if required. The people on this site are enormously helpful. Good Luck!
     
  10. johnk...

    johnk... F1 World Champ
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    #10 johnk..., Jun 24, 2016
    Looks to be pretty certain it's the accum. I've had the car idling in the drive way with a pan under the area where the accum is and there is a little gas in the pan. Just need to get under it and confirm.

    John k...

    P.S. Amazing that a Qv can sit and idle for 20 minutes and the water temp never gets over 190*F. :)
     
  11. ferrariowner

    ferrariowner Formula 3

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    #11 ferrariowner, Jun 24, 2016
    Horsepower is heat. Btw. I had to replace my accumilator after 30 years as well.
     
  12. yelcab

    yelcab F1 World Champ
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    #12 yelcab, Jun 24, 2016
    Hey Robo, JohnK is one of those people that regularly dish out advice. ..
     
  13. johnk...

    johnk... F1 World Champ
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    #13 johnk..., Jun 24, 2016
    Ok, problem solved. Not the accumulator, but fuel holding fuel pressure was the issue. Had to get under there to see it. Turned out that all that was necessary was to snug up on the cap that holds the banjo fitting onto the fuel pump check valve. No more leaks. Now that I think of it, I recall having this same problem about 20 years ago. :)

    Now I'll let it sit for a few hours and see if it starts.
     

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