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 > Class C 1994 with e350 chassis exhaust manifold glowing red

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j-d

Sunny Florida USA

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Posted: 09/12/17 05:59pm Link  |  Quote  |  Print  |  Notify Moderator

Is this the side where you fixed the broken crossover pipe stud? I wonder if the scorched wiring you found was at least partly the hot manifold.

From what I've read, excess unburned gasoline will overheat the catalytic converter, not the exhaust manifold. I think the hot manifold is a result of a LEAN condition as others have mentioned.

Older 460's got "EGR Plates" added, between the Intake Manifold and the Four Barrel Carburetor. This provided mounting for the EGR valve and the needed port back into the engine. The thick carburetor insulator gasket was on top and there was a thin gasket under. On ours, the Plate rusted to the mounting studs and the thin gasket blew out underneath. Lean condition. Ran better with both gaskets new and the connections cleaned up so tightening the nuts at the carburetor tightened the whole stack.

I also read that "older" 460's developed intake manifold gasket leaks. Again, lean condition. You may be able to spray carb cleaner, even WD-40, around the intake areas with engine running. If it "finds" an intake leak, you'll hear it in how it runs.


If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB

jcb47769

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Posted: 09/13/17 06:37am Link  |  Quote  |  Print  |  Notify Moderator

The manifold leak is on the opposite side (passenger side) from the large leak (fixed now) where I was battling the broken stud. The engine is EFI, could the computer be adjusting lean based on bad inputs? Or does that not happen on 1993 (i think I'm 1993 chassis)?

j-d

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Posted: 09/13/17 08:48am Link  |  Quote  |  Print  |  Notify Moderator

Check the Date on the Door Jamb Label provided by FORD. If it's later than AUG/SEP 1992 it's a 1993 chassis. Could make a difference in troubleshooting and parts.

According to RockAuto.com a 1992 has O2 sensors. Or SensoR. It only shows an Upstream (of the Converter) sensor. Some three-wire and some four-wire. That would mean it has some form of fuel mixture control.

Is this 460 TBI (Throttle Body Injection, Two Injectors in a carburetor-looking body) or MPI (Multi Port, Eight Injectors)?

Injectors are pretty dependable. This is above my pay grade, but I wonder if a clogged injector would not be detected as a fault, but run that area lean. And maybe even the O2 sensor report lean and richen via the rest of the injectors.

PaulJ2

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Posted: 09/14/17 11:02am Link  |  Quote  |  Print  |  Notify Moderator

Red hot manifolds mean either ********/late ignition timing or improper spark advance operation. Would also likely be down on power.
Make sure initial timing is set to specs with jumper wire disconnect if required. Some require this, some not.

Chum lee

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Posted: 09/14/17 11:30am Link  |  Quote  |  Print  |  Notify Moderator

jcb47769 wrote:

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?


The primary purpose of EGR is to lower combustion chamber temperatures which reduces NOx emissions. The end result of adding EGR is lower exhaust temperatures. It's quite common for EGR valves to plug up.

Excessive exhaust temperatures is one reason exhaust manifolds and studs break/crack.

Chum lee

jcb47769

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Posted: 09/14/17 03:54pm Link  |  Quote  |  Print  |  Notify Moderator

Made a little progress, EGR reconnected, now manifolds are ok but exhaust pipe just after is glowing red. I checked to see if the muffler was blocked and i dont think so. I'm replacing the o2 sensor just on principle, it's rusty and I'm keeping this class C for a while [emoticon]

Anyone know how to do the reset on the computer that make it have to relearn usage and adjust gas consumption?

* This post was edited 09/14/17 04:10pm by jcb47769 *

CharlesinGA

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Posted: 09/16/17 11:49am Link  |  Quote  |  Print  |  Notify Moderator

jcb47769 wrote:

Made a little progress, EGR reconnected, now manifolds are ok but exhaust pipe just after is glowing red. I checked to see if the muffler was blocked and i dont think so. I'm replacing the o2 sensor just on principle, it's rusty and I'm keeping this class C for a while [emoticon]

Anyone know how to do the reset on the computer that make it have to relearn usage and adjust gas consumption?


Ford EEC IV system, its not that sophisticated, just change the parts and drive it. Nothing for it to relearn. EEC IV is a very good system but there are things you need to pay attention to. Most have already been mentioned.

My experience is with smaller engines wiht EEC IV and not the 460 but the systems all work the same.

Find out what year the chassis is, and buy the FACTORY manuals off of Ebay, they are worth their weight in gold.

Charles


2007 Winnebago View 523H on a 2006 Dodge (Daimler-Chrysler aka Mercedes) Sprinter 3500 chassis. Bought Sept 2015 with 18K miles on it, Prog Ind HW30C, Prog Dymanics PD4645, Chill Grille, PML/Yourcovers.com deep alum trans pan, Roadmaster sway bar.

DiskDoctr

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Posted: 09/16/17 07:34pm Link  |  Quote  |  Print  |  Notify Moderator

460 ignition system (as I mentioned earlier) tends to burn out, causing misfires, dumps unburnt fuel into the exhaust, clogs up the catalytic converter.

You won't regret replacing the parts.

I spent extensive time working on and solving 1991 460 problems. All is good now for some time. Lots more power, too [emoticon]

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