Exhaust went red this mornings
 

So I started my car fine set the choke out And left it to warm up.... 1984 gsl with rb muffler 2gdfis and not much else. I came back to see a red underglow... Cool some might think but no I immediately look under and between the cat and the exhaust manifold it was glowing red hot so I hit the choke off and if sputter ( backfired) down to idle and I let it cool and drove to work checked it and it was fine . Thinking the cat was plugged lead me to the muffler shopped were I asked them to cutie out and straight pipe it. Rx7 specialties apparently buys old cats so l asked them to keep it to take there and when he brought me the cat and asked if I still wanted to keep it I said no as it was hollow. So problems leading up to this were thati went from 450 km a tank down to 350 km a tank and don't know why. The oil filler tube had lung mustard but after always warming it up before that disappeared but there is still some condensation in there. Anyone have ideas. I've been searching about running rich and mostly I think I'm running rich but I would have been for a while and this glowing is new so I'm stumped and only maybe a quarter as capable of a mechanic. Advice or opinions welcome thanks guys;) merry Christmas happy Hanukkah

Umm idk why your gas mileage dropped but are you running super lean and is ur timing off?? I know if u run lean and ur timing is off your exhaust will get way hotter. I dont think ur exhaust haveing a straigh tpipe inste dof a busted out cat will change MPG.

that was extremely difficult to read. all Canadians write like that?

No I just had the cat taken out after work to see of this was the problem but it was hollow just thinking mpg dropped because for some reason it might have been running rich but I am planning on checking the timing out tomorrow and checking the plugs just looking for more input to help me pin down the problem before Christmas hopefully.

No I'm on an iPad and it sucks my $&@ to type on

well theres your problem.... rotaries are are notorious for going into exhaust rage in the presence of apple products...

kidding aside do you still have your air pump hooked up? well at least before you cut the cat out ?

Like this??

http://www.youtube.com/watch?v=Mvknj...hTxipIBuFbJHGx

My choke doesn't go in for the 5 minutes and the other day it was out for a bit and I noticed my first cat got cherry red. Turned the car off and ran it with choke pushed in and it was fine. Usually cat get cherry red because of rich condition.

id say this, are your coils still good/ igniters.

Cats are overrated anyways, tests pipes are what all the cool kids run.

No leading ignition = glowing exhaust. Check for spark...




.

This. Glowing exhaust is typically RICH, not lean. Lean increases gas temperatures inside the pipe, true, but not hot enough to make the pipes glow like that because all the fuel is completely burnt up and its just hot air.

Overly rich causes unburnt fuel that is still combusting to travel down the pipe where it continues to burn, thus causing the pipe to get hot and glow. This also makes sense as to why it did it with the choke on, since the choke basically blocks air to richen the mixture for warm up. This would exaggerate any problems you have any other time. Not to mention obviously this also explains the fuel consumption, you're just pumping the gas out the tail pipe.

You need to check your ignition (coils, ignitors, plugs, wires, timing, etc). 80% of all carburetion problems are ignition :)

~T.J.

yea i have to say mine is really rich wile warming up my exhaust is fucking critial red untill after the cat would a getting rid of the cat help cool things down a bit due to less backpressure?

If the leading ignition is not firing, then the trailing ignition will spark the mixture. When this happens, the mixture will still be combusting when it hits the exhaust system.

Pull a leading plug and see if you have spark. I bet you don't. :)

I'm checking my plugs out today just got new coils before the 2gcdfis maybe the second gen could is bad. I have new plugs so I'll put them in and see if there is a difference

Ill go with too rich thats why you are losing gas mileage and by choking it your increasing the fuel even more. A cold rotary running rich will always turn the exhaust red.The unburnt fuel is burning in the exhaust.

I put in bur7eq or whatever the 2 gen s are in the leading spots and regular ngk in the trailing since I have 2gcdfis seems to be running better but will give it a cold start tomorrow morning and see how that goes. If I'm running to rich should I adjust the mixture ?? Or is this going to be a cold weather thing?? Also my plugs I took out were a little brown with a bit of corrosion but I have never changed the plugs in the three years I have had this and it seems to be running smoother. When I was starting it from cold I could hear little backfires like a pop pop but very quiet I will see if thesis still the case tomorrow?

Check the leading igniter also

Hhhhm would the 2gc have anything to do with this I have brand new 1 gen coils in already
But I just put second gen plugs in the leading today? Do ppl think I am running rich or that I'm running rich because of a bigger problem I know it's Christmas so don't think to hard

Basically this, check both your ignitors, and the wiring for the direct fire you got. I wired mine backwards going to my ignitor and it still ran fine but was running extra rich and the exhaust about melted down.

make sure your cats not clogged up and that your airpump is working properly while your at it.

Coil is wired right so the only thing would be ignitors does anyone have a good way to check ignitors then?

Or should I just search...... Hopefully someone's in the Christmas spirit

So no red exhaust but now it's squeaking and was having trouble idling when cold could this be sign of the igniter failing I just switched spark plugs with 2 gen leading and regular trailing??

Did i do something wrong in the plug change ?

I'm sick as a dog, and damned near out of patience here, so at the risk of repeating myself:

Did you visually verify that you have spark on your plugs?

Or you could just keep on swapping parts around hoping it gets better...

Well car runs fine daily aside from backfiring with the choke on but I will visually check spark this for suggestion will update tomorrow.

This for this suggestion*
Damn ipad

whats the verdict?

my exhaust will glow red when i sit and rev but thats because i
am running a holley for a streetport, and i am only stock :(

one thing i did with my 2gc tho is ran thicker wire to it and
it helped alot, alot less cutting out while driving

Your timing may be slightly retarded (firing a tad too late). A timing light is a very good investment....

Checked spark by pulling out one leading plug and turning over and there was a shit load of sparks lol prolly did it wrong but the plug had spark

cat got removed yesterday... no more cherry exhaust and i get more oomph to boot.

And I had the cat removed and it has a backfire going on while the choke is on but only when the chokes on I havent let it warm
Up with the choke on like I did when it went red because I don't like it backfiring while chokes on

ok so with the cat removed its backfireing more now? cuz my backfire has all but stopped.

Yes with cat gone mine
Is backfiring but it's more of a sputter but I can't say that because while it's warming
Up with the choke on in the dark I can see the puffs of smoke along with the noise but it is definitely more than a sputter. Maybe I am thinking to much about this tho?

if you'v got the choke on the car isent going to idle/fast idle smooth. since its going to be rich. mine pops and puffs away wile on choke also. if i let the choke go when its got enough warmth in it she settles down to a dead smooth idle. so if your off choke idle is full of vibrations and pops and sputters then be worried.

if it sounds like this before he kill it because its too cold then its fine.
http://www.youtube.com/watch?v=-NvE7Ck78U0

uh could you use a proper pc mobile links dont work on pc.

and here is the video after a bit of work

http://www.youtube.com/watch?v=Ki_yKsa0vzY


as for that your paranoid. also your car is really quiet.

heres my cold start. (with cats) and dead cold

http://www.youtube.com/watch?v=ZaRBX...2&feature=plcp

here it is at about 50c or so and trying to make it backfire. the second part is full op temp and purrs untill i pull the choke to try and get flames to come out. (yes i ment to shut it off to try and get bacfire... it failed. and yes i know the starter was like FUCK YOU!!!!. it rairly dose that)


http://www.youtube.com/watch?v=Uzjn-...1&feature=plcp


since i got the circulating heater in it and took the cat out it starts easyer and dosent pop nearly as much. it also sounds a bit different. i had found out that i had melted a hole in my cat... it also glow'd bright red untill past the end of the door. now with the cat out theres no glow or discoloration on the replacement pipe asides from where it was welded. i may make another video with the cat out.

so unless someone says theres something wrong (asides from the obvious i'v mentioned) then i wouldent be worried

Awesome thx you. It's good to know I can't and literally mean can't do shit with this iPad lol except for view and comment.... Pathetic apple truly sad:( as for your help thank you. very helpfulF man and much appreciated I was only worried cause it only started to happen after the exhaust went red and the cat got removed(which was hollow anyway) that it started to happen. And yea I always find that other ppls exhaust sounds more raspey and poppy than mine? Not a concern tho lol

no prob. you must have some crazy muffler on there for it to be that quiet. i can barley hear it in the video... where as mine LOL. im thinking of getting one of these.. its quite quirky.

http://www.racingbeat.com/images/items/16031.2.jpg

Rb muffler that's it lol before I had the muffler changed the neighbors hated me cold starts innthe morning f@"$&d there lives haha happy new years man I'm gonna cold start it tomorrow just for fun even tho I prolly won't drive it!!:)

yea now that you mention it it looks like a powerpulse muffler... no wonder its quiet.

yea quiet not for me. my buzzer dosent work so i wana know when im doing 7K when i'v got my music going. (i'v had it happen a couple of times)

Lol yea I still got the buzzer. And she
Is my dd so I redline line a few times every day but I don't bag her lol.
My old 88 gxl one morning wouldn't start after I
Left her at work for a week while we were out of town working and I was jumpstarting the car she didn't like to start When she was cold typicL but this car especially it had a aftermarket exhaust(I'll put up a pic) but blue green flames came out all four holes like four feet high!!! The guys I was working with thought I blew up the car hahaha!!! Came over to check on me!!

well i made a new cold start this time in -20c and showing the circulating heater. it definately sounds a bit different with the cat out.

hmm seems to smoke a bit less now?


http://www.youtube.com/watch?v=K9n8LxmBJy8

lol couldent do the semi warm 3k run because the tach was frozen still

http://www.youtube.com/watch?v=Iux0uASwKHk