Red hot exhaust manifold

[joshcorti11]

Hi guys, I have a 2004 Audi A4 B6 that I bought a couple months back from a buddy. When I purchased this car it was in pieces and had just gotten done over heating so I rebuilt the top end and re-timed the engine. I am satisfied with the way the vehicle is running, but there are a couple issues. My biggest concern is the GLOWING RED EXHAUST MANIFOLD. I do have a code reader and these are the codes I am pulling: P0420 (Catalyst System Efficiency Below Threshold Bank 1) P0299 (Turbo Charger Under-boost Condition), and lastly P0322 (Ignition/Distribution Engine Speed Input Circuit No Signal) I also found it weird that unplugging the MAS Sensor had no effect on the vehicle's performance. Do you guys have any ideas on what can be causing this red hot exhaust manifold? I do not want to drive the car to much in this condition to obviously avoid any further damage.
Thank you for you time, Joshua Cortigiano.

[old guy]

Possibly a partially clogged catalytic converter.

[EuroxS4]

Clogged cat for sure!!!!It common especially if the car has been leaking coolant into the cylinders for an extended period of time.

[IndoReef]

The heat in the exhaust flow is building up to quickly, the manifold is glowing because it has contact with the engine block/ exhaust ports .
Simple something is restricting the exhaust flow. Like stated it is going to be the Cat getting clogged, mine has over a year ago and i gutted it.

[B6_A4_Kid]

Clogged cat for sure, same thing happened to me.


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[BARRY]

ditto

[PSI NRG]

Definitely a clogged cat. Since I deleted my cat for a test pipe my manifold/turbo only glow unless I'm doing full throttle pulls and boosting hard.

[joshcorti11]

WOW EVERYONE thank you for all the information. I just order a new cat for my car and now it all makes sense! The whole reason the car over heated and the head cracked in the first place was because the water pump went bad. I know antifreeze went everywhere so thats gotta be what clogged up the cat. I appreciate all the info and I will leave a post on this thread with a performance update once the Cat is replaced. Thank again guys!!

[joshcorti11]

well i replaced the cat and the exhaust manifold, cat, and turbo charger are all still glowing red. Does anyone have any other ideas?
Thank you.

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maybe O2 sensors?

[joshcorti11]

Also, the car will only run when the MAF is unplugged. Can that have something to do with everything glowing red?

[persaudnav]

New cat and turbo. Must of costes u a bit? So when the MAF is connected car dies? After the work was performed what DTC's did u get?

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[EuroxS4]

Look at your fuel trims on MVB 32 if there maxed out at 25% your maf is no good.


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[Shortrun]

What do the spark plugs look like?

[joshcorti11]

Just a code for the MAF all the other codes have went away for now.

New cat and turbo. Must of costes u a bit? So when the MAF is connected car dies? After the work was performed what DTC's did u get?

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- - - Updated - - -

I checked the fuel trims with my blue driver obd2 scan tool and they all look good

Look at your fuel trims on MVB 32 if there maxed out at 25% your maf is no good.


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- - - Updated - - -

I have not checked them yet, but i will. Is there anything specific I should look out for?

What do the spark plugs look like?

[serezha]

Check wires on ignition coil ,maf.

serezha

[joshcorti11]

Are you saying to check the wiring harness?

Check wires on ignition coil ,maf.

serezha

[persaudnav]

With no MAF input. A default value or an incorret value is registered. I believe you're dumping too much fuel because the MAF value is incorrect. A faulty MAF may be the culprit. Check your long and short term fuel trims to verify.


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[joshcorti11]

well everyone i am stumped I just replaced the MAF and now the car will run with the MAF plugged in (it would not before), but it still seems under powered and the exhaust manifold is still glowing red. I don't think it is the timing because the car was running just fine when i first got everything back together.

[BARRY]

you'll need to log a bunch of ECU readings and report back to us. purchase a cheap OBD2 Bluetooth scanner and download free Torque from the app store. Then we could direct you to what parameters to log.

with all the things you've done so far really we need to know what's going on from the ECU standpoint.

[Gin+]

Log timing. Sky high egts can result from retarded timing. I see you originally posted a P0322 code which makes me suspicious as well.

[joshcorti11]

Log timing. Sky high egts can result from retarded timing. I see you originally posted a P0322 code which makes me suspicious as well.

Okay thanks for the response. What am I looking for when I log timing? If it was retarded timing wouldn't that retarded the vehicle right away? I did drive it for a little while with no issues at all. Also, if i was looking for retarded timing with the high EGT's would i be looking at the timing in the head with the chain and cam shaft lobes or would I be looking at the timing belt connected to the crank gear and cam shaft sprocket? I really appreciate your time.
Joshua Cortigiano

[joshcorti11]

you'll need to log a bunch of ECU readings and report back to us. purchase a cheap OBD2 Bluetooth scanner and download free Torque from the app store. Then we could direct you to what parameters to log.

with all the things you've done so far really we need to know what's going on from the ECU standpoint.

Thank you for the response. I already have the obd 2 blue driver, which can log a bunch of different things. Would that be sufficient?

[joshcorti11]

Okay guys the first pic is the current codes the vehicle is pulling.
[IMG][/IMG]
these next 3 pics are from the test i ran. The first pic is the test, the second pic is the vehicle at idle, and the third pic is the vehicle at 2000rpms.
[IMG][/IMG]


Here is the next set of test i ran. The first pic is the test, the second pic is the vehicle at idle, and the third pic is the vehicle at 2000rpms
[IMG][/IMG]

[BARRY]

can you take a picture of your timing belt cam timing as well as your chain tensioner timing. I want to confirm your timing belt is not off by a tooth.

[joshcorti11]

can you take a picture of your timing belt cam timing as well as your chain tensioner timing. I want to confirm your timing belt is not off by a tooth.

If worse comes to worse I will pull the whole front end off again :( and check the timing, but right now I am trying to narrow down all the other possible solutions.

[BARRY]

well...you can just pull off the plastic cover and slowly rotate your crank to TDC. its a bit difficult to get actual TDC without a dead on sight to the crank. from the top you'll only be making a very close guess. should be good enough to identify any issues though.

just don't forget your ratchet on the crank. i've done that once before and luckily it flew off without damage.

[JLAllroad]

Btw .....my new bone stock 2004 B6 used to glow red when ran hard....these usually run lean when untuned and rich when tuned to keep egts down.

Is the car tuned?
Is the car running well but you are concerned about the glow?
Underboost I would check for a loose wastegate and or bad N75, torn or old Diverter Valve

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[joshcorti11]

Btw .....my new bone stock 2004 B6 used to glow red when ran hard....these usually run lean when untuned and rich when tuned to keep egts down.

Is the car tuned?
Is the car running well but you are concerned about the glow?
Underboost I would check for a loose wastegate and or bad N75, torn or old Diverter Valve

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The car is not tuned, and right now I would say it is running in limp mode. I did replace the diverter valve and cat a couple of weeks back with no luck. I know the secondary air pump is bad because it will occasionally scream when I start up the car, so this is the next part on the list.

[JLAllroad]

The car is not tuned, and right now I would say it is running in limp mode. I did replace the diverter valve and cat a couple of weeks back with no luck. I know the secondary air pump is bad because it will occasionally scream when I start up the car, so this is the next part on the list.

Air pump will give you a cel when it actually quits but will not affect drivability just cold start emissions.


At this age you could chase vacuum leaks and check valves and pcv ....maintenance items would be plugs, coil packs, and fuel filter...all of which I would do before the SAI Pump.

Mind you this all assumes that the physical timing is correct, but, as stated I would not immediately assume issue due to the GLOW


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