[DeTomaso] Really Hot Header

Tue Dec 17 13:42:22 EST 2013

Without knowing anything about what your problem is, a rich exhaust can
cause a red hot header too. I found this out the hard way when I missed
matched the header order in a set of headers I made. In my case the lack
of back pressure allowed unspent fuel to burn in the header doubling my
Exhaust Gas Temperature readings in most throttle settings.

This was easy to tell. By removing the header, these tubes were sooted up
charcoal black. These rich primaries also had metal discoloration where
the others did not.

Gary

>
> If it is EFI - most of the new control systems have an O2 sensor on each
> side of the exhaust.  On the older Ford modules ( 93 and up Mass air)
> the pulse is read at cylinder pulse delay for each cylinder by the O2
> sensor in each exhaust.  This allows the ability to adjust each cylinder
> on the fly using the timing of the pulse to the O2.  Most Mass air
> systems that I have dealt with use individual cylinder pulsing up to
> 2000 rpm and the bank, bank from there on up.
> This is not saying I always get it right.
>
> jerry knotts
>
>
>
> On 12/16/2013 8:40 PM, Asa Jay Laughton wrote:
>> Plugged exhaust wouldn't let any gas out, or not enough anyway and it
>> will dilute the O2 sensor.  I don't think that's your problem. It
>> sounds like a lean condition on that one side.  Originally you didn't
>> specify you were using fuel injection I don't think.  My first
>> reaction was a fuel or air problem manifesting itself after so many
>> minutes.
>>
>> However, now I'm thinking your O2 sensor has gone bad, but that
>> doesn't make sense entirely if only one side is getting super hot.
>> You'll need to do some more troubleshooting.  Pull the plugs and read
>> them.  Describe your intake and fuel delivery system. Give us a bit
>> more info.
>>
>> Asa Jay
>> Asa Jay Laughton, MSgt, USAFR, Retired
>> & Shelley Marie
>> Spokane, WA
>> ******************************
>> http://www.racingagainstautism.com
>> http://www.teampanteraracing.com
>> http://facebook.com/racingagainstautism
>>
>> On 12/16/2013 4:44 PM, sean mundy wrote:
>>>  Thanks Michael.
>>> I thought of that too but my A/F meter and sensor is connected to the
>>> left side that got red hot.  During my 4min run it was only reading
>>> 11-12.5.  Just about its normal condition.
>>> My first thought was my exhaust was plugged somehow.   Have to get
>>> someone to put there hand over the exhaust tips next time I can get
>>> it started.
>>>
>>> ------------------------------------------------------------------------
>>> From: michael at michaelshortt.com
>>> Date: Mon, 16 Dec 2013 19:38:06 -0500
>>> Subject: Re: [DeTomaso] Really Hot Header
>>> To: seanmundy at hotmail.com
>>> CC: detomaso at poca.com
>>>
>>> Serious vacuum leak leaning out one side would be my guess.
>>>
>>> Michael Shortt
>>>
>>>
>>> On Mon, Dec 16, 2013 at 7:33 PM, sean mundy <seanmundy at hotmail.com
>>> <mailto:seanmundy at hotmail.com>> wrote:
>>>
>>>     Thought I had all my engine problems behind me but now I got a
>>>     new one.
>>>     Started running poorly again after about 15min of driving.  Won't
>>>     idle, backfires and barely runs.
>>>     Try again next day and it starts but 15min later, crappy again.
>>>     This weekend it was really hard to start cold but eventually
>>>     I got it to run for about 3-4 minutes
>>>     by blipping the throttle a lot.  Shut it off and smelled
>>>     something burning.
>>>     Opened the back and my left side header was glowing red.   Right
>>>     side header was normal.
>>>     My IR temp gun showed only 140 on the heads. Water and oil temp
>>>     gauges were barely reading.
>>>     Any ideas on what could cause just one side Header to glow red
>>>     hot so fast?  Thanks, Sean
>>>
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>>>
>>>
>>> --
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Michael L. Shortt
>>> Savannah, Georgia
>>> www.michaelshortt.com <http://www.michaelshortt.com/>
>>> michael at michaelshortt.com <mailto:michael at michaelshortt.com>
>>> 912-232-9390
>>>
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