help with E049
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Cadillac Seville / Cadillac Eldorado Forum Discussion, help with E049 in Past Cadillac Vehicle Discussion; Hey guys, I just posted on the purchase of a 1990 eldorado. Ever since I've known this car, it's given ...
  1. #1
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
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    Question help with E049

    Hey guys,

    I just posted on the purchase of a 1990 eldorado. Ever since I've known this car, it's given the e049 code for the air management system, but never bothered to repair it as the owner never wanted to spend the cash to repair it. Now it's in my hands and I'd like to get rid of the SES light.

    Back when I replaced the exhaust system on this car, I noticed that the air tube running to the catalytic converter was rusted out. I replaced it along with the exhaust, assuming it would kill the SES light, killing 2 birds with one stone. That wasn't the case however.

    Now that I own the car I've been looking at the issue more closely. So far I've just replaced the diverter valve with a used junkyard unit. This did not cure the problem either.

    I'm not sure of where the air should be directed under certain conditions. I plan to take a trip to the local library this week to take a look at the MOTORS books they have in stock for the diagnosing procedures. I don't have an FSM, but I consider these books to do pretty well, especially since they are free to use.

    I read somewhere recently that a leaking injector can cause this code to trip. I have noted that the car has a slight miss at idle, it can be felt in gear. It is a rythmic miss, indicating it's most likely isolated to one cylinder. I have replaced the cap, rotor, wires, and plugs all at the same time, with no change in the miss. I'm wondering if anyone has some clever techniques to diagnosing, or at least confirming the possibility of a leaking injector before I pull the fuel rail. I'd also appreciate if anyone could explain why a leaking injector could cause this code to be set...

    After typing that, I suppose I should check the pressure regulator as well, since I guess it could cause similar symptoms to a leaking injector

    Other than the *slight* miss at idle this car runs great. I'd like to add that the car even delivers fantastic fuel mileage, at 26 on the highway and 21 in the rural city. The car also gives great power throughout it's RPM range. I'm guessing this is the reason the previous owner never cared to fix it.

    Hearing any experience with this or a similar problem would be great. Please fill me in if you have any ideas.

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  3. #2
    chubbyranger is offline Cadillac Owners Connoisseur
    Automobile(s): 99 Seville STS, 08 STS4 N* 1SG F55
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    Re: help with E049

    I had an intermittent E49 on my 1990 CDV - replaced the switching/divert valve as well and it did not go away. However, it did not occur that often either so a reset by clearing codes would buy me a few months. With FSM you should be able to individually disable cylinders through diagnostics so that may be the key to isolating your problem. Check eBay.

  4. #3
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
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    Thread Starter

    Re: help with E049

    Thanks for the reply,

    I was considering leaving it as well, since mine also appears infrequently. Still kind of bothers me though and I'd like to take care of it if possible.

    I have what I consider to be a great supplement to an FSM. I am aware of the capabilities of shutting down individual injectors. I could try but I thought since the miss can be hard to feel at times, it would not be easy to pinpoint it this way. But I may not have another option really.

    Just kind of wondering about the theory behind a leaking injector tripping this code before I go any further... Any ideas from anyone?

  5. #4
    BDCadillac is offline Cadillac Owners Member
    Automobile(s): 1990 Cadillac Seville
    Join Date
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    Re: help with E049

    Quote Originally Posted by drewsdeville View Post
    Hey guys,

    I just posted on the purchase of a 1990 eldorado. Ever since I've known this car, it's given the e049 code for the air management system, but never bothered to repair it as the owner never wanted to spend the cash to repair it. Now it's in my hands and I'd like to get rid of the SES light.

    Back when I replaced the exhaust system on this car, I noticed that the air tube running to the catalytic converter was rusted out. I replaced it along with the exhaust, assuming it would kill the SES light, killing 2 birds with one stone. That wasn't the case however.

    Now that I own the car I've been looking at the issue more closely. So far I've just replaced the diverter valve with a used junkyard unit. This did not cure the problem either.

    I'm not sure of where the air should be directed under certain conditions. I plan to take a trip to the local library this week to take a look at the MOTORS books they have in stock for the diagnosing procedures. I don't have an FSM, but I consider these books to do pretty well, especially since they are free to use.

    I read somewhere recently that a leaking injector can cause this code to trip. I have noted that the car has a slight miss at idle, it can be felt in gear. It is a rythmic miss, indicating it's most likely isolated to one cylinder. I have replaced the cap, rotor, wires, and plugs all at the same time, with no change in the miss. I'm wondering if anyone has some clever techniques to diagnosing, or at least confirming the possibility of a leaking injector before I pull the fuel rail. I'd also appreciate if anyone could explain why a leaking injector could cause this code to be set...

    After typing that, I suppose I should check the pressure regulator as well, since I guess it could cause similar symptoms to a leaking injector

    Other than the *slight* miss at idle this car runs great. I'd like to add that the car even delivers fantastic fuel mileage, at 26 on the highway and 21 in the rural city. The car also gives great power throughout it's RPM range. I'm guessing this is the reason the previous owner never cared to fix it.

    Hearing any experience with this or a similar problem would be great. Please fill me in if you have any ideas.
    This sounds almost exactly what is happning with my seville. i need help with it. i hate that ses light. except i havent started to repair it i just got E049 today

  6. #5
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
    Join Date
    Oct 2004
    Location
    Oak Creek, WI
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    5,381
    Thread Starter

    Re: help with E049

    What ended up happening with this car is one of the check valves on the AIR system were leaking. This was sending hot exhaust gasses up to the diverter valuve, destroying the diaphragms. In turn, this was causing the system to pump fresh air to the front exhaust manifold, full time. Since the fresh air gets pumped AHEAD of the oxy sensor, it was screwing with the fuel trim, causing the miss and stumble. The fuel trim on the left bank was maxed out (160) while this problem was occuring.

    To repair the problem, I needed to replace both check valves and the dirverter valve. This brought the fuel trim back to normal and consequently the code disappeared.

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