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Won't idle / stalling when hot?
https://slantsix.org/forum/viewtopic.php?t=55842		 Page 1 of 1
Author:  Nomad [ Thu Jul 24, 2014 9:53 am ]
Post subject:  Won't idle / stalling when hot?
Hey guys,
Here we are again… Noobie question!

’77 225 slant six, 3-speed manual. New old stock carburetor w/ new float and set for manual trans., also new old stock distributor, vacuum advance can and alternator + the valve lash is set to specs. Ran fine since I replaced the parts mentioned above a year a half ago (18-20 in of vacuum at idle, no stall, decent mileage).

Just had the timing chain and sprockets replaced (it had about 8 degrees of play in and was loosing too much oil from the cover) + radiator hoses, cap and thermostat.
Got the van back from my mechanic this morning. Everything was going nicely (ran better than it ever had: very smooth idle, better acceleration)…
… for about 20-30 minutes!

Then it suddenly stalled after making a sharp turn on a parking lot.
Restarted the engine a couple of times but it won’t idle at all (needle on the vacuum gauge was bouncing everywhere a few times before the engine died)
A little load on the electrical system (like playing with the power steering a bit) seemed to make it die even faster.
Might be temperature related, but I did not let it cool down to see what difference it will make.

I had to keep my feet on the gas to prevent it from dying at every stop but I was able to drive it back safely to my mechanic’s place (a few blocks away).
I’ll let him deal with the issue. He knows old cars, and since he’s an old friend of a good friend of mine he has my trust.

Still, I’m curious about what you guys think might cause the stall.
Opinions and advices here had been my best ressources for learning about slant six engines for the past years, so feel free to give it a shot!
Thanks in advance :)


NB: Also, forgot to tell my mechanic that Dan’s fuel line mod wasn’t a temporary hack, so he plugged back the old metallic fuel line rather than removing it, I don’t think it’s related but it might still be worth mentioning.
And please forgive me if my english is not perfect ;)
Author:  Joshie225 [ Thu Jul 24, 2014 10:04 am ]
Post subject: 
Sounds like trash in the idle circuit. The trash could easily have come from the old fuel line. I would pull and disassemble the carburetor.
Author:  nm9stheham [ Thu Jul 24, 2014 10:37 am ]
Post subject: 
^^^ This is my first thought too. And it could be general rust and crud in the fuel tank or the old line; tank rust is VERY common for cars as old as yours. A vacuum leak would also do this; it would be good to check all vacuum lines; a line may have fallen off or cracked.

The tendency to die faster with the power steering is likley just the direct load from the power steering system.

And you English is a million times better than my French! :wink:
Author:  Nomad [ Thu Jul 24, 2014 12:29 pm ]
Post subject: 
Author:  Aggressive Ted [ Thu Jul 24, 2014 1:14 pm ]
Post subject: 
I would remove the old metal gas tubing so that mistake won't happen again....what a bummer.

I run a fuel filter that is actually a fuel water separator that filters down to 2 microns. That seems to keep the carb super clean the past 10 years or so...

Click on the red link to view pictures....
Author:  nm9stheham [ Thu Jul 24, 2014 7:15 pm ]
Post subject: 
Ted, does the bowl pull off of this unit for cleaning? Looks interesting....
Author:  Aggressive Ted [ Fri Jul 25, 2014 1:03 am ]
Post subject: 
Yes, the filter is a canister type and unscrews like an oil filter. It also has a drain at the bottom to let the water out. It is the same style used on all marine engines and 18 wheelers.
Author:  nm9stheham [ Fri Jul 25, 2014 7:22 am ]
Post subject: 
Very good; thanks for the info! Looks like a good unit for these old cars, with the rusty/cruddy gas tanks being so common.

If you don't mind, I'll add it to my lost of things to reccommend.
Author:  Nomad [ Fri Jul 25, 2014 12:14 pm ]
Post subject: 
I’ve always been impressed by your setup Ted
I should probably use a fuel/water separator like yours, specially since I have to go trough a full tank of that crappy winter-blend gas + stabilizer every spring after letting the van sit outside all winter…

Anyway, after letting the van run a while and fine tuning the carburetor the issue seems to be gone .Not sure what it was.
Also, just went the muffler repair shop and now everything sounds perfect!

BTW it’s amazing how fast the engine is reaching optimum operating temperature now that heat riser valve is working freely.
Author:  Aggressive Ted [ Fri Jul 25, 2014 5:51 pm ]
Post subject: 
Glad it running good again!

I put so many miles on my car it isn't funny.....long commutes to work, etc..
Having the fuel water separator over the years has been a real blessing as I sit for hours sometimes in traffic and idling at 500 rpm it never misses a beat.

Having a full 12 volts to coil is sure nice too! The plugs stay nice and clean.
Author:  1930 [ Sat Jul 26, 2014 12:01 am ]
Post subject: 
Quote:
Glad it running good again!

I put so many miles on my car it isn't funny.....long commutes to work, etc..
Having the fuel water separator over the years has been a real blessing as I sit for hours sometimes in traffic and idling at 500 rpm it never misses a beat.

Having a full 12 volts to coil is sure nice too! The plugs stay nice and clean.
Not to get off topic from original post but I would like to know where the filter can be purchased and at what cost. Maybe a part #?
Author:  Aggressive Ted [ Sat Jul 26, 2014 8:27 am ]
Post subject:  Fuel Filter and fuel water separator
Quote:
Not to get off topic from original post but I would like to know where the filter can be purchased and at what cost. Maybe a part #?
Sure, I have listed it many times before on this site. A good investment!

Perma-Cool fuel water separator part# Perma-Cool 81794 - Perma-Cool Fuel Filter and Water Separator Kits Fuel Filter/Water Separator, Paper, 2 Microns, 1/2 in. NPT Inlet/Outlet, Kit. Perma-Cool 81000 - Perma-Cool Replacement Fuel Filter Elements

Re-routed fuel line with 30R9 fuel injection hose.
Author:  1930 [ Sat Jul 26, 2014 2:30 pm ]
Post subject: 
Thanks, did you order it on-line or was a kit avail locally? ( where ) I am going to get it.
Author:  Aggressive Ted [ Sat Jul 26, 2014 2:41 pm ]
Post subject: 
I ordered it on line but since found that my local auto parts store can get them too! Any marina will have them as well or any truck stop.
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