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Hard starting after sitting 850 1996

posted by  Jayfry on  Sun Oct 24 20:17 CST 2004
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last visit: Sun Apr 6 17:28 CST 2008
[RELATED]

I'm hoping someone here might be able to give me some options to check on this one. This thing has me stumped. Up until a few weeks ago the car has started AOK every time for the 80k miles we've owned it. Not that it may make a difference, but the last big repair we had done (clutch and engine seal) was just a week before this started to occur. This has been going on for about 3 weeks. It's NA, 5 speed.

Symptoms:
After sitting 4-5 hours the engine will not start promptly. It will turn over and try to start but shudder for a 1-2 seconds before stopping. Turn the key again and it fires up immediately - like it should. Starts AOK for a couple hours after that. Obviously this becomes an issue commuting to work and home.

Things I've checked so far:

1. Fuel pressure at rail for ignition-on (pre-start) is 40 psi immediately, during running it's 46 psi. Turning off the engine it drops immediately to 40 psi. It takes about 30 minutes to drop off 6-8 lbs.

2. I installed a new fuel filter - just in case.

3. Battery connections are tight and clean.

4. The Fuel Pressure Regulator does NOT have and return fitting. It has only one fitting that goes to the vacuum tree. The replacement FPRs DO have a vacuum and return fuel line fitting. I find that odd since it just sits there hooked to vacuum. The vacuum end seems to be intact - no gasoline in the line.

5. No other obvious symptoms such as codes/lights. Mileage is good, acceleration/power is great through all RPMs. Idles smoothly. No gasoline or unusual exhaust smell. Ambient temp has been about the same as before.

Being that this started so suddenly has me wondering what changed. It will start just fine for 1,2,3 hours. It's the long wait when it malfunctions.
Any suggestions that I might be able to check would be appreciated.
Many thanks in advance!
JF








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    Hard starting after sitting - my solution 'It's the gas', stupid! 850 1996

    posted by  Jayfry on  Sat Nov 6 21:25 CST 2004
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    last visit: Sun Apr 6 17:28 CST 2008
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    It had to be the simpliest of solutions....After using the same gas station and brand for years I came to the conclusion it was several loads of bad gas. We happen to be out of town and took a fill up. The problem disappeared immediately. Runs fine now.

    To think that we kept filling up at THAT station for weeks - still getting portions of the crap that was in that stations "supreme" grade tank!!!!

    From now on that's the first thing I'll change if those type of problems show up.

    amazing how some crud or "blend" can make such a big difference - yet it's not something I would have focused in on immediately- looks, smells, tastes like good gas....

    good luck and hope your fix is just as easy if you read this trying to figure your issue out!

    Jeff








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    Hard starting after sitting 850 1996

    posted by  KlausC on  Tue Oct 26 11:10 CST 2004
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    last visit: Fri Oct 24 10:15 CST 2014
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    I had that problem with my 88 245. The check valve died and gasoline was running back into the tank after the car was shut down. Not sure if 850s have one. Try turning the key to II and waiting for 5 seconds before hitting the starter, if that works then it's only a $10 fix.

    Klaus
    --
    98 V70Rawd(101Kmi), 95 854T(85K mi), 88 245(165K mi)







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