EGR tubes and TPS question.
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HT4100 4.1, 4.5, 4.9 Discussion, EGR tubes and TPS question. in Cadillac Engine Technical Discussion; I have some maintenance to do on my Deville and as such, have a couple of questions dealing with the ...
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    EGR tubes and TPS question.

    I have some maintenance to do on my Deville and as such, have a couple of questions dealing with the 4.9. 1. Is there a specific way to clean the EGR tubes? One of them is completely clogged with carbon so that needs to be taken care of. 2. I think the TPS needs to be replaced and was told that on some cars they have to be "programmed". Is that the case with these motors? I have got to get this car getting better gas mileage.

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    Re: EGR tubes and TPS question.

    Rod out the EGR tube with whatever it takes, coat hangar, screwdriver, etc. Don't worry about the TPS until that is done. That may be all you need.

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    Re: EGR tubes and TPS question.

    If you replace the TPS it will have to reset. If the car doesnt coast down when you let off the gas then it may be out of whack but otherwise it's probably fine.

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    Re: EGR tubes and TPS question.

    Went over to a friend's house and cleaned the TB. He kept spraying and spraying till the whole can is nearly gone. Now the car is keeping it's self idled up to the point that it was maintaining around 50 mph on it's own coming back down the road. Maybe that will evaporate out of the system over night and it will act better tomorrow. If not, any other ideas?

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    Re: EGR tubes and TPS question.

    The carb cleaner will be eliminated in minutes if not seconds. I guarantee it was gone before you shut the hood.

    Its likely your TPS is out of adjustment...

    Enter diagnostics and go into 'ECM OVERRIDE?' Whne you get to ISC, press the 'cooler' button and watch the ISC plunger retract until it does not touch the throttle lever.

    Then press 'off' and go into 'ECM DATA?' and the first listing will be TPS. Watch the number count down while the ISC is still retracting which takes about 20-30 seconds. When it stops counting down it should be between -.5 and .5. Its likely that yours is outside of the range.

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    Re: EGR tubes and TPS question.

    I know nothing about going into the system on these cars. It is much easier to do on my ETC. ISC?

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    Re: EGR tubes and TPS question.

    Quote Originally Posted by Ranger View Post
    Rod out the EGR tube with whatever it takes, coat hangar, screwdriver, etc. Don't worry about the TPS until that is done. That may be all you need.
    If it is clogged badly you may have to use a drill bit (FSM recommends).

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    Re: EGR tubes and TPS question.

    Quote Originally Posted by ga_etc View Post
    I know nothing about going into the system on these cars. It is much easier to do on my ETC. ISC?
    Try the sticky at the top of the forum. I'm familiar with the Eldo/Sevilles's DIC, not the Deville. ISC is 'Idle Speed Control' motor.

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    Re: EGR tubes and TPS question.

    Quote Originally Posted by ga_etc View Post
    Went over to a friend's house and cleaned the TB. He kept spraying and spraying till the whole can is nearly gone. Now the car is keeping it's self idled up to the point that it was maintaining around 50 mph on it's own coming back down the road. Maybe that will evaporate out of the system over night and it will act better tomorrow. If not, any other ideas?
    Spray alone will not do it. You have to rod that hardened carbon out.

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    Re: EGR tubes and TPS question.

    We took a coat hanger and cleaned it out.

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    Re: EGR tubes and TPS question.

    Now that it's all cleaned out, it sounds like it is idling too high. I would disconnect the battery for 10-15 min and go through the idle relearn process outlined in the owners manual. It may idle fine without the idle relearn because it will default to clean throttle body setting but I usually do it anyway.

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    Re: EGR tubes and TPS question.

    I disconnected the TPS for a min and hooked it back up. The idle is back to where it should be. I cleared the codes and after driving the car, no codes have popped back up. E55 is gone, but the slight rough idle and jump/sputter under light load is still there and gas mileage hasn't improved. At this point I'm thinking fuel delivery problem somewhere. It accelerates fine so I doubt it's a fire problem. I'm thinking the fuel filter is getting stopped up, but not sure.

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    Re: EGR tubes and TPS question.

    If the filter was the problem the engine would starve for fuel under high fuel demands such as highway driving or WOT. If that's not the case, forget the filter.

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    Re: EGR tubes and TPS question.

    Well it's not starving for fuel. If anything I think it's running a little rich. I'm lost with this thing. It accelerates fine, and feels like it has the power it should. I don't know where to start.

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    Re: EGR tubes and TPS question.

    Have you checked for a leaky FPR?

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