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Old 11-29-2004, 02:56 PM   #1
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Angry 454 Engine Problem

Got everything fixed with the batteries, now I have a problem with the engine. The engine will run fine until it is warmed up and than it will just quit and I will not be able to restart it. I will let it sit for 5 or so minutes and than it will crank right up and go again. Anyone got any ideas on what it could be.

Brian
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Old 11-29-2004, 03:03 PM   #2
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Probably either Fuel or Spark

Easy enough to diagnose -

Start engine with the air filter off. As soon as it stops, look down into the carb and activate the throttle (take the key out of the ignition first) and observe whether or not there is fuel present, if not, start checking fuel filters, electric pump, and lines - lots of info here in previous threads about fuel delivery in the 345's.

If fuel is not the problem, check for spark during the "no start" period.
If electrical problem is determined, I would start with the coil (most likely culprit), and diagnose both "upstream" and "downstrean" from there.
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Old 11-29-2004, 03:08 PM   #3
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I agree with Dennis. Sounds like fuel delivery to me but certainly check the spark as well. also check to make sure your choke is opening up all the way.
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Old 11-29-2004, 03:53 PM   #4
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GM ignition modules have been a problem, if it turns out to be that, it is inside the distributor, under the rotor. Should be two 3/16" head screws holding it in. Be sure and use dielectric grease under the new module, or it will fail in short order.

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Old 11-29-2004, 05:27 PM   #5
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It takes 4 things to make an engine run---fuel---ignition<spark>---compression--and timing. All you have to do is determine which one is missing when it refuses to start. While there are things that can cause compression and timing to come and go it's highly unlikely. Dollars to donuts it's fuel or ignition. An easy way to check ignition is to pull a plug wire off , attach an known good spark plug to it and lay it on the engine. While someone cranks the engine check for spark at the plug. Caution,,,watch where you put your hands, sleeves, etc while you do this . It's easy to get wraped up in a fan belt when your in the engine compartment.-----Pieman
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Old 11-29-2004, 07:09 PM   #6
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Choke is not opening.

Quick way to verify is watch the choke after you start the engine It should be fully open within about 3-4 minutes. if it doesn't open if will drowned the engine.

Verify power to the choke element once you start it cold. Round doohickey on curb side of carb with one plug). The engine has to be running for it to get power. There is a oil pressure switch that will not send power to the choke if there is no oil pressure. On a 350 that switch is behind the distributor. I think on the 454 its above the oil filter on the side of the block or its on the street side of the block just in front of the motor mount. The sensor will have 2 or 3 wires on it depending on the carb. There is a Quad that has a fuel mis solenoid and it will have a wire for that.

If there is power then meter the resistance on the element. I think its suppose to be 45ohms but its been a while since I have checked one.
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Old 12-13-2004, 09:24 AM   #7
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Update

Finally got around to analyzing everything that deals with the fuel system and it ended up being the electrical fuel pump. To figure this out I put a clear filter up next to the carb and drove the AS around town. When under load the filter would go empty. So that's when I figured that it had to be the fuel pump. Changed the fuel pump and drove it on a 60 mile trip and no problems.

Thanks for all the help.
Brian
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Old 12-13-2004, 09:30 AM   #8
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great job of self diagnosis. Common failure for sure on your model.
The other item mentioned- the ignition module, is a spare part that is worth carrying also. Inexpensive insurance.
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Old 12-13-2004, 09:40 AM   #9
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Bad Coil

Sounds like a classic example of a bad coil to me.

Coil cool it runs, coil gets hot it quits.

At least that's the first place I look.

Don
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Old 12-13-2004, 10:21 AM   #10
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Thumbs up Nice One!

Brian - nice job! Good idea to use a clear filter up front to "see" what was going on with fuel pressure. Another "shade tree" diagnostics device I'll remember for the future.
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Old 12-13-2004, 10:29 AM   #11
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Smile

I changed a lot before I figured out it was the fuel pump. I just left the new parts on and will keep the old ones for spares. From what I have learned from this forum is that you can never have too many spare parts for these beauties.

Thanks,
Brian
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Old 12-13-2004, 11:27 AM   #12
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true- somewhere in the archive folks posted lists of what they were carrying with them on the road...quite amazing

(edit) actually here is the thread I mentioned----

http://www.airforums.com/forum...ht=spare+parts
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Old 12-13-2004, 02:47 PM   #13
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Does your motorhome look like this?

Hi Brian this is Richard in Bat Cave.
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Old 12-13-2004, 04:30 PM   #14
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That would be my lovely lady!
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