Author Topic: Frustrated Too! My Engine Still Shuts off after 15 minutes.  (Read 5130 times)

Offline Trevor Y

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Gentlemen, I thought I had my problem licked after the last thing it did and that was to set my Dist. air gap back down to .008 from over .020 from when I got the car.
Things fired better and small drives made it look like I was ok, but....
Yesterday, fired her up and drove around the neighborhood to make sure things where ok.
They were but after 15 mins or so as I came down my alley she acted a little funny, I knew I needed gas so parked it,
when inside to get my stuff to go over the Cindys house and 10 minutes later fired her up and headed to the gas station.
It was bucking a bit, but once again I though gas. Turned her off and filled her up. Off I went down the road for 3 miles and 2 lights, not a problem.
Left the lights and sped up to take an on ramp to the freeway, at the freeway , opened her up and it started kicking.
I feathered the pedal, pumped the pedal, but all the time loosing speed and kicking an bucking til finally coming to a stop with the engine dead.
Lots of fast traffic so I got out of the car opened the hood and let her cool off for 20 minutes exactly. I know from previous, that it might start after
10 min cool down, but will die again shortly after.
It started up with kicks and bangs like she was firing wrongly, but did start and away I went and made it home.

This 1972 has a 383 engine with 727 auto. Stock intake that I just put on with new gaskets.
New fuel pickup, fuel line blown out, fuel gauge installed on line to carb, 5 psi all the time, new fuel filter before the pump.
Holley 670 cfm Street Avenger, I just installed a 4.5 power valve and cleaned out the filters on the two inlets.
The Old MSD-6A box is wired directly to the Battery with good power and ground.
The Coil is a brand new MSD Epoxy Filled unit that i was told is ok to install on the manifold horizontally, Don't do this to the oil filled MSD ones.
I jumpered the single ballast resistor to rule that out.
I checked all the plugs and gapped, they where at 35 and I went with 45, obviously not part of the equation.
Mopar electronic distributor with 0.008 air gap.

Well this is what I have and not sure of my next move.
Maybe get a new pickup that goes into my distributor and try that.
That sound the cheapest.
Next would be a new distributor, but that would be just for fun, since the guts should fix any problem there.
Next would be a new MSD box.

Please throw in your 2 cents, this is driving me mad!!!!
Thanks
Trev


1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick




Offline HP_Cuda

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #1 on: May 07, 2012 - 12:30:47 PM »

Whats the stock gap on your points? I'm thinking they are closing up and shutting you down.

No spark without a gap there. Once I actually had my point completely close on me when my other hot rod over heated on me. Was kinda crazy to diagnose but once they were gapped properly ran like a charm again.
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD

Offline Chryco Psycho

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #2 on: May 07, 2012 - 12:36:46 PM »
Try the pick up coil , I was trying to fire a new engine to do the cam break in , the engine would quit 2 mins into the run & would not refire , I thought it was a carb setting problem [6 pack ] at first , shut it off ofr 5 mins & it would fire right back up , acted like it was flooding , started misfiring & would die out . Installed a new pick up & the problem stopped .

Challenger - You`ll wish You Hadn`t

Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #3 on: May 07, 2012 - 12:53:18 PM »
Thanks HP, its not points, its electronic so air gap.
Thanks C P, I'll pick up the new pick up at Napa hopefully.
Or do I get that at Mopar down the street?
Does anyone have the part number or what I ask for.
I'm thinking its the same part across the board, but could be wrong.
Trev
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick

Offline HP_Cuda

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #4 on: May 07, 2012 - 01:23:58 PM »

You think the armature is touching? It shouldn't be..

Some pointers:
http://www.mymopar.com/downloads/elecignconv.pdf  :cheers:

You can always pull a plug and see if you have spark, then move onto fuel delivery.
« Last Edit: May 07, 2012 - 01:36:17 PM by HP_Cuda »
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD

Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #5 on: May 07, 2012 - 01:29:37 PM »
Yes, the last time it happened was on a side street, so I cranked it off the starter solenoid with the key on and used the coil wire against ground on the block.
The spark was terrible and hit and miss.
This is where I figured out the triggering off the distributor pick up and fixed the air gap.
Spark was crisp and hot then, so thats why I thought I had her fixed til yesterday.
Didn't want to get killed on the highway yesterday so opted to sit in the ditch til she cooled.
I'm picking up a new pickup today.
I'll report.
Trev
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick

Offline Chryco Psycho

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #6 on: May 07, 2012 - 02:03:43 PM »
Rock Auto has it for under $10
Standard part# LX102 or LX102T
 or Airtex /Wells 4P1240

Challenger - You`ll wish You Hadn`t

Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #7 on: May 07, 2012 - 03:33:00 PM »
Wow, thats cheap, Napa is 40.44 and is a Echlin MP804 he thinks....lol.
Ahhhhh.
Thanks
Trev
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick

Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #8 on: May 08, 2012 - 10:09:30 AM »
Well picked up your LX102 for $32.00 up here, Wow, we really pay throught the a....!
It did not help at all.
Still stalled down the street after heated up.
Checked the spark while hot and it was like 4 sparks and then 4 nothings and 4 sparks and 4 nothings while I cranked the engine using the starter relay with the key on.
I let the car sit for an hour once home, then went out and checked the spark again off the coil wire.
I expected 8 like clean sparks, but it was the same.
I'm going to pick up a new fuel pump today since I'm sitting at 4-5 psi and shop for a new MSD-6A for Thursday.
Everything else has been replaced or cleaned or checked.
Thanks guys.
Trev
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick

Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #9 on: May 09, 2012 - 11:09:01 AM »
Update for Tuesday!
Picked up the new fuel pump and installed it.
Everything went well and the Push Rod for the Pump looked brand new.
It measured out at 3.22", not sure what its suppose to be, but that was it.
Started up the car right away with a steady 5.25 psi fuel pressure.
It was rock steady where the old pump made my pressure needle jump.
Took her out for a ride and once again, the car is a little better with everything i do.
Drove around a lot in the neighborhood and I thought this might be the fix.
Well, stopped at my buddies shop for 2 minutes and let it run.
Went to leave and 100 yards away she started to die again and no throttle pumping would keep her going.
Let her cool down and finally made her home.
Tim brought over a new MDS-6A digital and after a hot tub and shower, installed that and went to sleep at 11, just dead and worn out.
Tonight, we will see how this fires and if all my troubles go away.
Next thing is a bomb I guess!!! lol
Trev
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick

Offline 4Cruizn

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #10 on: May 09, 2012 - 11:35:38 AM »
 :popcorn:

Offline HP_Cuda

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #11 on: May 09, 2012 - 01:03:03 PM »

Definitely sounds electrical now, unless we have a carb issue.

That would suck if it's vapor lock but for that many times it would be a long shot.
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD

Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #12 on: May 09, 2012 - 01:09:20 PM »
I have driven around with the gas cap off, does that eliminate vapor lock?
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick

Offline dodj

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #13 on: May 09, 2012 - 03:30:20 PM »
Noticed your Blaster coil is mounted horizontally in a warm spot. I have heard they are not supposed to be mounted like that. Could be contributing?
Scott
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2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
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Offline Trevor Y

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Re: Frustrated Too! My Engine Still Shuts off after 15 minutes.
« Reply #14 on: May 09, 2012 - 03:45:41 PM »
lol, that was my post..... The Red ones are filled with oil with an air bubble, they can not be laid over horizontally.
This one is there heavy duty epoxy filled one. It can be laid over.
I still might move it to the fender well.
Thanks for making me think about how I will mount it once again.
Trev
1972 Barracuda - FM3 Moulin Rouge - 383 - Slapstick