Dead coach

[steve southworth]

> You describe a lack of spark. Figure the liquid coming down the carb throat is in fact gasoline then a lack of spark to light it is highly
> indicated. Check with the timing light and report back. Or just hazard ten bucks and buy a new ignition module. Worst case it's a spare to have
> on hand. Advance or any of them ought to have a light for lend.
>
> --johnny

Pertronix module.

Checked with timing light. No flash. Pulled spark plug (#7) grounded it and saw very weak spark (amber) with only an occasional blue one. I will
test the timing light on the toad to determine if it is working.
--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

 

[dave stragand1]

That's not really ideal -- carburetors are set up for specific
applications. Even a 455 car carb is set up quite differently from a
455 GMC Motorhome carb, so a 403 carb will be different as well.
However, it should still start & run.

I'd still check the spark as folks had mentioned, and also would still
give it a quick shot of starter fluid just to be sure it isn't related
to poor fuel.

It is cranking over at a fast enough speed when you turn the key,
correct? I don't think that was mentioned, so best not to assume.

Does the oil pressure look okay when cranking, and have you checked the
oil level? (This can be an obscure, lifter-related cause of a
no-start).

-Dave
1978 Transmode near Pittsburgh

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of
Steve Southworth via Gmclist
Sent: Wednesday, October 16, 2019 5:24 PM
To: gmclist
Cc: Steve Southworth
Subject: Re: [GMCnet] Dead coach

One thing not mentioned. I have a 455 but the carb is off a 403.

From what I can tell it should not make a difference. At least for
starting. Air moves past a Venturi and sucks out enough gas to make
the proper
mixture. ?????

--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

 

[LarryW]

Steve,
I had a similar situation on a cold restart. Also have a pertronix type pointless ignition. There are two types of Pertronix. One type has a ring of
magnets mounted under the rotor and sensor on the points plate. Part #1181. Magnet passing the sensor triggers spark. The other type has just a
sensor that triggers off of the distributor cam lobes. Part # 1181LS (LS is Lobe Sensing) Mine had the ring of magnets type, and one of the magnets
dropped out and wiped out the trigger mechanism....no spark. If you find one of the magnets missing, from the ring, that is probably the problem of
no spark. If that is the problem, replace it with the PerTronix 1181LS....NOT the 1181. See this link:

https://www.amazon.com/sk=pertronix+1181&gclid=Cj0KCQjw_5rtBRDxARIsAJfxvYAQtQFGvEmU8uaAl_2d2PNroDw5YZY5sC93XSo7EHXGMxwjB8pecwUaAuh7EALw_wcB&hvadid=174254216159&hvdev=c&hvlocphy=9019332&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=9664558291525399405&hvtargid=aud-646675773986%3Akwd-4196625802&hydadcr=7467_9322228&tag=googhydr-20&ref=pd_sl_63rx6cmyl9_e.

If this is the problem also check your coil. This problem somehow sent full time juice to the coil and boiled my coil. Ended up getting this coil.
https://www.summitracing.com/parts/pnx-40011

Also check the braided wire that grounds the points plate to the distributor body. Found mine broken.

HTH
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

 

[Rich Kinas]

I had a similar problem with my coach when I was originally bringing it
home. I swapped the plugs and closed the gap (to assist a weak spark), it
fired right up and ran perfectly.

Rich

On Wed, Oct 16, 2019 at 6:24 PM Larry via Gmclist
wrote:

> Steve,
> I had a similar situation on a cold restart. Also have a pertronix type
> pointless ignition. There are two types of Pertronix. One type has a ring of
> magnets mounted under the rotor and sensor on the points plate. Part
> #1181. Magnet passing the sensor triggers spark. The other type has just a
> sensor that triggers off of the distributor cam lobes. Part # 1181LS (LS
> is Lobe Sensing) Mine had the ring of magnets type, and one of the magnets
> dropped out and wiped out the trigger mechanism....no spark. If you find
> one of the magnets missing, from the ring, that is probably the problem of
> no spark. If that is the problem, replace it with the PerTronix
> 1181LS....NOT the 1181. See this link:
>
>
> https://www.amazon.com/sk=pertronix+1181&gclid=Cj0KCQjw_5rtBRDxARIsAJfxvYAQtQFGvEmU8uaAl_2d2PNroDw5YZY5sC93XSo7EHXGMxwjB8pecwUaAuh7EALw_wcB&hvadid=174254216159&hvdev=c&hvlocphy=9019332&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=9664558291525399405&hvtargid=aud-646675773986%3Akwd-4196625802&hydadcr=7467_9322228&tag=googhydr-20&ref=pd_sl_63rx6cmyl9_e
> .
>
> If this is the problem also check your coil. This problem somehow sent
> full time juice to the coil and boiled my coil. Ended up getting this coil.
> https://www.summitracing.com/parts/pnx-40011
>
> Also check the braided wire that grounds the points plate to the
> distributor body. Found mine broken.
>
> HTH
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[Ken B]

Steve, call me at home if you need help. My number is on the Black list.
A GMCer helped me 80 miles away last Thursday and that is about what Logansport is from here. So I am just paying it forward. If there is no answer
here, I will be outside with my backhoe digging holes and planting trees. SPEAK SLOWLY to my voice mail and repeat any numbers twice.

Ken B.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[steve southworth]

KenB - Update. I got the GMC running only to find out I have a completely blown out LH exhaust manifold gasket. I've picked up a new one and will
be, hopefully, getting it installed this morning. I'll also email you as my hearing is also not so great.

Thanks to everyone for help so far. When this is all done I'll publish a forensic analysis of this whole topic.

> Steve, call me at home if you need help. My number is on the Black list.
> A GMCer helped me 80 miles away last Thursday and that is about what Logansport is from here. So I am just paying it forward. If there is no
> answer here, I will be outside with my backhoe digging holes and planting trees. SPEAK SLOWLY to my voice mail and repeat any numbers twice.
>
> Ken B.

--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

 

[Ken B]

OK Steve,

If you need anything, call me. Email is OK but like normal snail mail, I only check it occasionally. The telephone will get a you a more immediate
response.

I should be home planting trees today and I should be around the Valparaiso Airport on Saturday and Sunday. Call my home first. I do not live with
my cell phone and I leave it in my car, sometimes for days, between use. (two 1 Nine - two 6 three - eight 1 seven 4)
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana