"mkbruin, Atlas VP" (mkbruin)
07/13/2017 at 09:49 • Filed to: None
2
10|
"mkbruin, Atlas VP" (mkbruin)
07/13/2017 at 09:49 • Filed to: None | 2
| 10 |
Background: It ran! For the past two weeks I’ve been starting it 3x per week, backing into the driveway, idling for 15-20min, then pulling back into the garage. Last weekend I took it out for the first time. Drove about 1.5 miles to the gas station, filled up with the top octane gas, drove across the parking lot to Kroger, then drove home. Absolutely no issues. Three hours later I went to drive it to dinner, no start.
A close inspection revealed a vacuum line that had essentially disintegrated. I replaced that line, but while I’m sure the other lines aren’t 100% they at least appear intact.
Air Canister lid off, wife pumping the pedal, gas is spraying into the carb. It’s getting fuel.
Pulled a plug wire last night, connected a spare plug and grounded to the chassis. Confirmed I’m getting spark.
Put a jumper on the diagnostic for the check engine light to look for codes. Repeats code 12 endlessly, no other codes.
This is driving me batty. It worked, and then didn’t. It never died on me, it just wouldn’t turn back on. I’m getting air/fuel/spark, I think. But it’s not even trying to start.
Maybe filling the tank loosened debris? Maybe that debris clogged the carb? That’s about all I can think of now, gas going to the carb but not getting through to combustion. But why would that happen after I park and not while driving? Ugh.
RamblinRover Luxury-Yacht
> mkbruin, Atlas VP
07/13/2017 at 09:55 |
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Automatic choke failure? You can have “normal” quantities of gas at the carb, but still fail to start without the choke operating - at least with some engines. That, or maybe EGR valve failed open and your engine is just sucking its own exhaust?
I’m trying to think of things that would have actuated on warm-up, and failed either then or on cooling back down.
pip bip - choose Corrour
> mkbruin, Atlas VP
07/13/2017 at 09:57 |
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fuel pump?
Future next gen S2000 owner
> mkbruin, Atlas VP
07/13/2017 at 10:24 |
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Timing off? Seems unlikely bit also seems to fit symptoms. Maybe your neighbors rotated your distributor cap 180 degrees.
Does starter fluid do anything? Maybe a choke issue?
I’m grasping at straws.
Edit: I final thought. Vacuum leak downstream of carb causing lean condition. That’s my best idea.
Textured Soy Protein
> mkbruin, Atlas VP
07/13/2017 at 10:27 |
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Is all that piping some kind of diabolical EGR system? Just from the looks of it I feel like it wants to cause problems.
jimz
> Textured Soy Protein
07/13/2017 at 10:40 |
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that’s a Turbo Trans Am, with the ill-advised 301 c.i. turbo V8.
cletus44 aka Clayton Seams
> mkbruin, Atlas VP
07/13/2017 at 10:48 |
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Wait, you own a turbo Firebird?
Demon-Xanth knows how to operate a street.
> mkbruin, Atlas VP
07/13/2017 at 10:50 |
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Turbo 301, nice. I’ll still take a ‘65 Corsa if I want a problematic turbo.
Danimalk - Drives a Slow Car Fast
> mkbruin, Atlas VP
07/13/2017 at 11:21 |
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I don’t really know that engine but just going off your repair history, if you already had one fail on you and the vaccum lines are that old/ bad as you say, then I would look at all those more closely first. I’m sure there are a lot, but do any do anything downstream of the carb that could effect the amount or pressure of the air/fuel/spark?
BiTurbo228 - Dr Frankenstein of Spitfires
> mkbruin, Atlas VP
07/13/2017 at 11:27 |
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Do you have some easy-start stuff? Try spraying that into the airbox and see if it’ll fire and run with that. If it does, then your ignition system’s not at fault.
I like Ramblin’s suggestion of an auto-choke failure. If it starts with the easy-start, try to keep it running on the throttle until it warms up. Once it’s nice and hot, shut it off again and see if it’ll start up without the easy-start. If it does, money’s on some fault in the choke mechanism.
crowmolly
> mkbruin, Atlas VP
07/13/2017 at 14:01 |
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Doesn’t stumble at ALL when it’s trying to start?
What components did the vacuum line connect??
I’d try this order:
1.) Make sure the choke isn’t stuck closed
2.) Try some starting fluid down the venturis
3.) Take off the distributor cap (mark or leave the wires in place) and see what the inside looks like.