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 > Class C 1994 with e350 chassis exhaust manifold glowing red

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jcb47769

Rhode Island

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Posted: 09/10/17 10:02am Link  |  Quote  |  Print  |  Notify Moderator

Has anyone seen anything like this?
[image]

It's not a clogged catalytic converter, and I've replaced the PCV valve recently.

Exhaust manifold glows under heavy load (hills and over 55)

I found a small exhaust leak in the manifold gasket, thinking about sealing it with exhaust repair epoxy instead of risking the rusty bolts holding on the manifold.

BluegrassBill

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Posted: 09/10/17 11:56am Link  |  Quote  |  Print  |  Notify Moderator

Normal. Be sure its the gasket and not a cracked exhaust manifold. Cracked manifold very common for a 460. Usually passenger side rear.


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ernie1

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Posted: 09/10/17 12:36pm Link  |  Quote  |  Print  |  Notify Moderator

Yeah I"ve seen that in my 1989 E350 that also got the tail pipe beet red and blistered the paint on the side of my rv. Problem? The O2 sensors were bad which caused the gas to flow heavily into the catalytic converter and finally caused the internal portions to fall apart and plug up. Result was lack of power and 4mpg.

Llibnmap

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Posted: 09/10/17 02:54pm Link  |  Quote  |  Print  |  Notify Moderator

IMO if mainfolds are glowing red it's running way too rich! Either that or the exhaust is clogged. Just my thinking

Bill

Edd505

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Posted: 09/10/17 03:15pm Link  |  Quote  |  Print  |  Notify Moderator

That have a heat riser by chance? If it does it's sticking.


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ScottG

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Posted: 09/10/17 04:17pm Link  |  Quote  |  Print  |  Notify Moderator

Llibnmap wrote:

IMO if mainfolds are glowing red it's running way too rich! Either that or the exhaust is clogged. Just my thinking

Bill


On a gas eng it would indicate a lean condition.

If it has been a long time since the 02 sensor has been replaced, I would do so.
They get lazy and cause poor performance way before they're so bad it triggers a CEL.


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jcb47769

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Posted: 09/10/17 05:13pm Link  |  Quote  |  Print  |  Notify Moderator

No CEL but EGR is disconnected at the moment. It was glowing before I disconnected it though. Do 1994 e350s get check engine light though?

Home Skillet

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Posted: 09/10/17 09:01pm Link  |  Quote  |  Print  |  Notify Moderator

Llibnmap wrote:

IMO if mainfolds are glowing red it's running way too rich! Either that or the exhaust is clogged. Just my thinking

Bill


100% correct.


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DiskDoctr

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Posted: 09/10/17 10:33pm Link  |  Quote  |  Print  |  Notify Moderator

FIL has a 1991. Check your plugs for weak spark, allowing unburnt fuel.

Replacing your rotor, cap, plugs and wires and ignition coil can breath quite a bit of power and life back into these 460 gassers.

Home Skillet

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Posted: 09/12/17 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

I would also check the fuel pressure regulator.
The would leak fuel internally, allowing raw fuel into the vacuum hose. Which then goes into the engine.

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