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Red Hot exhaust

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ARTIC-1 View Drop Down
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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Topic: Red Hot exhaust
    Posted: 12 August 2010 at 9:39pm
i have a stock 2.8 witch i just finnish putting togather,on the first fire up it
ran real smooth,but had slight miss in it.rockers needed to be ADJ.so
tonihgt after work i pulled the top of the motor all down to ADJ all valve lash
out,i had all reddy run it for about an hour so far,alls well,small miss!put it
all back togatger an fired it up COLD an with in 1 min i could see the
exhaust turnning cherry red! on all 3 on the front side,iam sure the back
side was to?where do i start?fule regulater-injector,allso the idle was
jumping up to 2000 then allmost stall,any help would be great,thanks
SNOW MAN
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86-GT/AUTO-2.8_ BLACK
88-TTop/ Duke-2.5. RED
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Capt Fiero View Drop Down
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Post Options Post Options   Quote Capt Fiero Quote  Post ReplyReply Direct Link To This Post Posted: 12 August 2010 at 10:21pm

If you have a fuel pressure gauge, check the fuel pressure, and double check the timing.  I should rephrase that, check the timing first, advance it at least a couple degrees.

Other common issues for glowing exhaust are, fuel pressure too low, bad or disconnected O2 sensor.  Bad ground for O2 sensor.

If you have an intake leak due to a gasket that did not seal correctly it will cause a high idle, and lean condition which can cause the red exhaust syndrome.

Double check all the hoses that you removed and put back on, double check all the bolts that they are tight.

Start with the easy stuff and the basics and work your way up.

Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.
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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 12 August 2010 at 10:44pm
Thank Dave
SNOW MAN
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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 22 August 2010 at 9:59pm
HI GUYS
so i fixed the VAC leek an it runs real nice,i fired it up tonight @ dusk an
notice in the dark the exhaust manifolds glow red? normal? or ive still got a
leek some were,any one know or any ides what to look for next,thanks
SNOW MAN
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Post Options Post Options   Quote Patrick Quote  Post ReplyReply Direct Link To This Post Posted: 22 August 2010 at 11:06pm

Did you set the timing with the jumper in place?

 

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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 22 August 2010 at 11:16pm
yes,where is it located,
SNOW MAN
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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 22 August 2010 at 11:31pm
Found it,this is rite i take it?
Remove panel that houses cigarette lighter (they are torx screws). Behind
panel is ALDL (Assembly Line Diagnostic Link), use a wire or paper clip (bent
to a "U" shape), and connect terminals A and B. They are the only two pins
side by side on the connector.

Start engine, SES light will flash every second, ECM is in "field service" mode
(all computer advance is removed).

Connect timing light and point to marks, timing is 10 degrees BTDC.
SNOW MAN
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Post Options Post Options   Quote Patrick Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2010 at 12:45am

That's correct. You've just got to hope the outer ring of your harmonic balancer hasn't slipped (like mine had), otherwise the timing marks would be all out of whack.

 

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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 04 January 2011 at 7:56pm
Hello all
Hope the holidays went well for everyone,New years day i fired up the Fiero @dusk an got some vid of the hot spots,so this is what i have learned here so
far with every ones help.
-EGR
-VAC Leek
-TIMEING
-an maybe injectors
all this could cause this prob?where to start?
thanks

2011-01-04_195159_pipe_.mov
SNOW MAN
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Post Options Post Options   Quote Patrick Quote  Post ReplyReply Direct Link To This Post Posted: 04 January 2011 at 10:34pm

You're allowed to upload more than 3 seconds of video.

 

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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2011 at 12:03am
ok i had to slice an dice an HDMI file to see if it would all work,sorry.ill try
to max it out next to 2megs,cheers
SNOW MAN
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Post Options Post Options   Quote Dawg Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2011 at 1:40pm
A slight glow in the dark is just fine.

The Dawg
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Post Options Post Options   Quote Romeo Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2011 at 2:56pm
Damien could be right. If it's pitch black out, I have seen manifolds glow ever-so-slightly right at the ports. How does the engine run if you block off EGR completely? Still rough? How is your fuel efficiency? If you have no other symptoms other than a faint glow, I wouldn't fret.
Never shift into reverse without a back-up plan.
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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2011 at 6:53pm
so much good info here,thanks.Eng runs a little,alittle rough in my mind,but dosen't shake or miss.when i built the 2.8 i checked the timeing with the heads off,with#1 @TDC an marked the harmonic
balancer,it was on the mark-0 no slipage.i disconnect the EGR when it was running last weekend an pulled it open by hand to see if anything would change,yes,with it held open,@2000 to 5000 rpm the
Manafold would get hot faster.hooked it back up.back to SQ-A?timeing was done with the jumper in @15/16@1000RPM,so its vaccume probly? so many lines,allso brake booster,should check it to.any help
would be great! thanks

2013-03-28_233109_HOT_Fiero.mov
SNOW MAN
87-GT/AUTO-2.8_ WHITE
86-GT/AUTO-2.8_ BLACK
88-TTop/ Duke-2.5. RED
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Post Options Post Options   Quote kharmata Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2011 at 10:24pm
Originally posted by Dawg Dawg wrote:

A slight glow in the dark is just fine.The
Dawg


So...what is a slight glow exactly...a very very faint
touch of light red or would it be acceptable to see a
definite red color change encompassing the pipe in varied
spots...??? anyone got pics maybe?
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Post Options Post Options   Quote ARTIC-1 Quote  Post ReplyReply Direct Link To This Post Posted: 29 March 2013 at 12:26am
Still working on the fire ball,did any one look at the movie
i poster?-thats not a slight glow exactly?-I use a Laser Infrared
Thermo gun an got
surface temperature-800 dg.@5000/RPM
an shut her down befor somthing melted eh! After replacing
all ECM fuel metering components,an fixing Vac/leeks its a lot
better,but @ 5000rpm just the rear 3 CYL-2-4-6 get hot.1-3-5
 get red-
slight glow LOL- but not like the rear bank.What i know
for sure is.
-#A-going through a ton of fuel
-#B-smell unburnt fuel in exhaust when running.
-#C- same in closed or open loop.
-#D- injectors don't leek/holds 30LB-+ for one hour
-#E-EGR is all new/pipe an valve,no leeks.
-#F-new -CTS/ECM sensor
-#G-cold start INJ is not leeking,tested good.
-#H-the 0/2 is new less than one hour on most
of this stuff,so i think its Fuel- any one care to toss
 their 2 cents in would be appreciated.next i will check
the Cat an see if it fried! an fuel SYS again-AUGF!
thanks all for reading this post,an heres the movie again
in case you miss it in past post LOL-Cheers.
Thanks-Joe

 

2013-03-29_001838_HOT_Fiero.mov
SNOW MAN
87-GT/AUTO-2.8_ WHITE
86-GT/AUTO-2.8_ BLACK
88-TTop/ Duke-2.5. RED
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