Before the cat

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Thread: Before the cat

  1. #1
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    Before the cat

    I popped my hood last night after a short drive and I noticed that the component in between the catalytic converter and the engine was glowing red. I am trying to look up information about this but I don't know what it is called. any help? If i can figure out how to add a picture I will do that.

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  3. #2
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    1.8T engine? (Always give some basic information before asking for help). Might be the turbocharger's turbine housing- but it shouldn't glow red hot after a "short drive" unless that was wide-open throttle up a long hill.

  4. #3
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    Trying to post a picture

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  6. #4
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    yes, the 1.8T. Sorry, crucial details. The short drive was probably 3 miles. a couple of hills but nothing too big. If I could get a picture to post, it has 2 bolts in it going from the top down.

  7. #5
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    it's the turbo all right...........third bolt in back you cannot see, check your coolant level, imo ,turbine is frozen

  8. #6
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    I can hear the turbine spin up when it is supposed to. Is there a down pipe on this model of Passat or does the turbo go straight to the catalytic converter?

    On a side note, I changed my oil tonight and notice that there was oil in my intercooler hose.

  9. #7
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    Some oil in the hose is to be expected. The PCV system discharges crankcase vapors into the duct before the turbo, so everything from there to the intake manifold, including the throttle, will get some oil residue.

  10. #8
    PZ
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    The turbo goes straight to the cat, then the downpipe. You could have a clogged cat, your car could be running lean, it could be running hot or it could even be a misfire. Does the car have the CEL on?

  11. #9
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    Nope. no check engine light. I was looking at it last night and there is an air pump hose (Part# 058 133 785 3) that is cracked. I can't tell if it is leading to the turbo or the secondary air intake. Could this be causing an improper mix?

  12. #10
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    That elbow is on the line that runs from the secondary air injection pump to the combi-valve. It it's leaking you could have less air being injected into the exhaust which could throw the mixture off. If the leak is bad enough, exhaust can leak out of those hoses when the SAIP is supposed to be running. That will mean less exhaust will make it to the oxygen sensor which can also throw the mixture.

  13. #11
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    Well, that could be the source of the random exhaust smell that I get every now and then. It is cracked in 2 different spots. It could also explain why the sound of the SAIP went from an airplane to more of a whistle. I ordered the $7 part off Amazon and splurged for the $4 overnight shipping. stay tuned.

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