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Glowing exhaust manifold

Discussion in 'Stock 1991 - 1994 Explorers' started by packpride, September 28, 2008.

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    1. packpride

      packpride New Member

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      I have a problem with a glowing exhaust manifold. I have a 90 ranger 2.3 with about 300,00o mile on it. It started all of a sudden. I did the usual tune up stuff, plugs,wires, coils ,and ecm with no luck. I had the cat checked and there is no problem with it. What would cause this problem
       
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    3. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    4. Sams01XplrSprt

      Sams01XplrSprt Southern Cali Explorer Elite Explorer

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      welcome
       
    5. RockinExplorer

      RockinExplorer Active Member

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      Pictures would be good, but most likely the cat is totally blocked, put your hand over the exhaust outlet(when cold) and see if it moves your hand, if not the cat is pretty much toast. Or crawl under the car hit the cat, if it rattles its blocked.
       
    6. aldive

      aldive Elite In Memoriam

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      How was this performed.

      Your description does sound like a cat problem to me.
       
    7. packpride

      packpride New Member

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      That was my first guess a clogged cat so I had the cat tested by two different shops. The first checked by just how much it was flowing.He said it could be a number of things have to run some tests.The second checked the flow, the temperature before the cat and after.He said if there was a blockage the temperature at the back would be colder than the front.It was the same.Ran a diagnostic no codes timing is ok so i,m stumped.I noticed the manifold only glows at the bottom not at the head. I did a tune up could the wrong heat rang of plug cause this just a thought.O and I removed my exhaust pipe my cat is hollow go figure.
       
    8. Dopler174

      Dopler174 Official Welcome Committe Moderator Emeritus

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      It sounds like blocked exhaust. I would pull the down pipes from the manifold. See if it is still glowing hot. If not, then it's probably the cat(s).
       
    9. mcelwajy

      mcelwajy Member

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      everytime I've dealt with glowing exhaust parts, the cat has been the culprit. We don't have e-check in my part of ohio, so I have no cat!
       
    10. Melon

      Melon Active Member

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      Did it start just after the plug wires were done? I had a glowing cat on a 3.8L SC T-Bird once and I had the plug wires in the wrong order.

      -Melon
       
    11. fordnut71

      fordnut71 Active Member

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      id say cat also. but check your firing order.1,3,4,2
       
    12. boggs1227

      boggs1227 Well-Known Member

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      :rolleyes: yet again...my bad
       
      Last edited: November 13, 2008
    13. Fivspeed

      Fivspeed New Member

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      Newsflash....cat has it been guessed already. The OP says his is hollow...move on to guessing something else.

      The problem may be a firing order issue, as some have mentioned, but I'm leaning towards a fuel issue. For your exhaust manifold to be glowing red, fuel is making its way to your exhaust manifold. So, think leaky injector, general misfire, bad exhaust valve (not closing all the way) etc.
       
    14. boggs1227

      boggs1227 Well-Known Member

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      :popcorn:
       
      Last edited: November 13, 2008
    15. little x

      little x Well-Known Member

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      Thanks for posting the obvious Fivespeed. It was really irritating me that everyone kept saying cat after the OP said his was hollow. A very informative great 1st post to this forum.

      To op: when you took out the pipes I assume that while you had them off you checked to make sure all the pipes were clear, not just the cat?
       
    16. mechanix

      mechanix Got beer?!?!?! Elite Explorer

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      What was the reasoning of changing the ECM? Are you sure the one you installed was the right calibration? There are many different calibrations to ECM's. Maybe you got the wrong one and it is dumping fuel like mad into the engine? Also do you notice any performance issues? Like when you take off from a dead stop the truck will "stumble"? Do you notice any dark gray exhaust coming from the tail pipe? This will be an indication of unburnt fuel. I know you have said you had the exhaust checked out, did they use a back pressure gague? Also you said your cat is hollow, where did all the junk from the cat go? Maybe the cat broke apart and is sitting in your muffler causing the issue.

      Eric
       
    17. boggs1227

      boggs1227 Well-Known Member

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      i wonder if the ecm could have the memory re-flashed to the stock parameters for his year (factory settings) ?
       
    18. boggs1227

      boggs1227 Well-Known Member

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      ...i guess this post is a good example of what can happen when either you or others do not read every reply in a post ....funny how something can get out of hand when some yells "fire " and others hear that and start running without looking around first.
       

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