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 RT side manifold glowing red ?

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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 12:35 am

I'm hoping to get some help with finding out why the rt. side manifold glows red ? During a smog check the engine is reved to 2500 rpm and held there for 60 seconds, it was then I noticed it starting to glow. Has anyone else ran into this issue ?
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Fred Kiehl

Fred Kiehl

Posts : 5913
Join date : 2009-11-13
Age : 72
Location : Largo, FL 33774

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 7:46 am

I remember a post that said it was a clogged cat. I do not remember if it was on this forum or the other one.
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lakeffect

lakeffect

Posts : 3892
Join date : 2009-08-18
Location : Rochester NY 14621

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 8:51 am

Please verify if you have batch flow and not Individually controlled injectors. Under batch flow an entire bank of injectors, odd or even, is connected together, and all go off at the same time.

If you swap the harness connectors right for left, one of two things should happen. The problem also swtiches sides , or it stays where it is.

If it stays on the same side, I'd go along with the clogged cat idea. the exhaust isn't getting out. If it switches sides it's likely that you are going lean. For some reason you just aren't getting enough fuel in that bank. Maybe bad ground,
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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 12:26 pm

The ground did enter my mind... but do the injectors have seperate grounds ? Now if the cat was clogged, wouldn't be glowing as well ? I had read here that that was a sign of a clogged cat and there is flow at the tail pipe. It does feel sluggish from a dead stop which is what made me look at a possible cat being the problem. But hey guys I really do appretiate the help and I will start with the injector's and if not I'll have to find someone to check the flow rate or the cat. Thanks again guys.
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200OZ
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200OZ

Posts : 1736
Join date : 2009-08-06
Age : 46
Location : Farmington NY.

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 2:27 pm

My RT side manifold was glowing last year and found it to be a clogged cat. The cat was glowing a little bit, bearly noticeable compared to the cherry red manifold though.

Mike
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toomanytoyz

toomanytoyz

Posts : 3233
Join date : 2008-11-04
Age : 44
Location : Sandown, NH USA

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 5:30 pm

Yep. Plugged cat. but there's a reason it's plugged... Figure it out after you replace it or it'll happen again. Or just hollow it out or replace it with a test pipe. Wink

That side is running pig rich or burning oil or something to cause it to plug.
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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 6:40 pm

I wish I could. We have to test once a year in Nevada. Gutting it might work ? Twisted Evil

Mike... did you find out what caused it to get clogged ?
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phantom 309

phantom 309

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 7:11 pm

lakeffect wrote:
Please verify if you have batch flow and not Individually controlled injectors. Under batch flow an entire bank of injectors, odd or even, is connected together, and all go off at the same time.
,
eh?? your experience with your mongrel doesn't reall translate well into mpfi,. or tbi,.

Nick
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200OZ
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200OZ

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeFri Jun 18, 2010 11:49 pm

I had my RMW for about 3 months, and the car was running progressively worse by the day so I did a complete tune up (opti plugs, wires). It's when I took it out for a test drive when I finished the tune up that I noticed the glowing manifold. The next day I took off the right side cat a few golf ball sized pieces fell out of the back side of the converter. After I cleaned it out I noticed some of the intact pieces were melted. The opti I took off the car had three plug wire terminals that were all but gone in the cap, just some white powder was all that remained (I was surprised the car ran at all when I saw that). So after the tune up my gas mileage went up from 13-14 mpg to 17-18 mpg. The 3 corroded terminals on the dist. cap were all on the right side, so I was just pouring unburned fuel into the right cat, and it melted and broke. I coincidentally had bought an NOS set of export pipes a few weeks earlier off CL and put them on instead of selling them, which was my original intent when I bought them. Fixed.
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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeSat Jun 19, 2010 1:34 am

I changed the opti and W/P a few months ago, but I had changed the plug wires and plugs maybe a year before. I don't remember seeing anything like that as far as the wires are concerned. Some did come out without the terminal, but being that the wires were the ones it came with from the factory, I figured that was to be expected. I pulled the broken off terminals out and replaced the wires. I had to do the opti due to the W/P going bad. As I said before, I had the cat in the back of my mind for a while now. I guess I'll have to have it checked out and if bad, I'll have to replace it. Thanks for all the help guys... I will post the end result.
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94 LT1 Wagon

94 LT1 Wagon

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Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeTue Aug 03, 2010 12:46 am

Well the cats got replaced with Magnaflow cats, but it's still glowing ? doesn't appear to be as bad but still red. The fuel pressure reg. was also replaced due to having the smell of fuel at idle with the A/C on, also had the pcm reflashed and the LT. side knock sensor and connector replaced. Everything else came up after the cats were replaced and got CEL. Next in line is gonna be a cat back, but this manifold has me scratching my head still.
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phantom 309

phantom 309

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeTue Aug 03, 2010 11:16 am

you need to datalog the car,. check a/f ratio's etc,. could be a bad injector,.bad O2,.
did/does it pass emissions? throwing parts at something because of an unknown problem,. can oft times cost unknown amounts of time and money,.
Diagnose it right first,. then fix it,.

Nick
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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeTue Aug 03, 2010 2:36 pm

It has passed smog just fine in the past. After the reflash was done then all the other issues came up, a buddy of mine at the local Chevy dealer scanned it yesterday with their scanner and all is well ? Like I mentioned before, it's still glowing, not as bright but still there. The reflash was done cause my scanner said there was a problem with the PCM, the regulator was changed because of the fuel smell and because the pressure would drop off on the gauge. The smell went away but the pressure still dropped off after the reg. I put a new sending unit and fuel pump in it not more than four months ago. Throwing parts at it just because isn't my thing, that's why I'm asking here. I was hoping that maybe someone had been threw this and hit the nail on the head ! The big thing for me is not having a CEL getting any feed back from two scanners and knowing something just isn't working as it should.
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phantom 309

phantom 309

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeTue Aug 03, 2010 6:25 pm

well not sure what sort of scanner (as you put it) is being used here,. but idling etc,. not showing the problem,. it's be best to drive the car with a data logger hooked up,.
you mentioned you had a reflash,. because of your scanner,. the problems started after the reflash,. am i missing something here?
perhaps try a different pcm,.
who reflashed it??


Nick
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sherlock9c1



Posts : 2308
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Location : Huntsville, AL

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeTue Aug 03, 2010 10:59 pm

I sent my injectors to Witchhunter Performance and they found I had 3 bad injectors, two of which were so bad they had to be replaced. When you run out of options, do the injectors.
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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeTue Aug 03, 2010 11:37 pm

phantom 309 wrote:
well not sure what sort of scanner (as you put it) is being used here,. but idling etc,. not showing the problem,. it's be best to drive the car with a data logger hooked up,.
you mentioned you had a reflash,. because of your scanner,. the problems started after the reflash,. am i missing something here?
perhaps try a different pcm,.
who reflashed it??


Nick

Local chevy dealership reflashed it.
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94 LT1 Wagon

94 LT1 Wagon

Posts : 80
Join date : 2010-06-05

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PostSubject: Re: RT side manifold glowing red ?   RT side manifold glowing red ? Icon_minitimeWed Aug 04, 2010 12:02 am

Injectors had crossed my mind, I'll pull them off and have them tested. The knock code came up after the reflash, the sensor and wire connector were replaced, code cleared at the dealership and all is good, no more CEL or stored codes. Just the manifold glow. Sorry for not being clear on that, I'm just freaking frustrated.
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