Ht-4100 rwd info
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HT4100 4.1, 4.5, 4.9 Discussion, Ht-4100 rwd info in Cadillac Engine Technical Discussion; looking to buy 1984 fleetwood d'elegance with 47981 miles but has a poping sound from throdle body what could this ...
  1. #1
    EIGHT2BIARRITZ is offline Cadillac Owners Member
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    Ht-4100 rwd info

    looking to buy 1984 fleetwood d'elegance with 47981 miles but has a poping sound from throdle body what could this mean is it worth repair

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    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Ht-4100 rwd info

    Sounds like a burnt valve.

  4. #3
    carnut is online now Cadillac Owners Master
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    Re: Ht-4100 rwd info

    No it sounds like a flat cam lobe. If you can get it to pop constantly as you power brake the car, its a flat cam. Power brake is " left foot on brake pedal right foot on throttle pedal, apply throttle" gently for 20 seconds. Also remove the oil filler cap and inspect its underside for a light brown milky substance, if there, the intake gasket failed and damaged the cam at least. not worth the repair.

  5. #4
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Ht-4100 rwd info

    Of course there is the simple thing that could cause the popping, a carbon track in the distributor cap. But the cam lobe failure is highly likely on these engines.
    The "good" thing about the rear wheel drive is that a cam change is the same as a Chevy V8 RWD, and not like the FWD situation.
    If you were into doing your own work, it would not be too bad of a job, but paying to have it done would likely be expensive.

  6. #5
    carnut is online now Cadillac Owners Master
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    Re: Ht-4100 rwd info

    My experience is if the cam is flat, then that coolant has already attacked the crankshaft and camshaft bearings. cam bearings are not usually serviced in one's driveway.

  7. #6
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Ht-4100 rwd info

    If there is no coolant leak, a low miles engine could be saved with a new cam, lifters, and timing set. It's all about how much you want to spend to make a driver out of it.

    These engines seem to have cam problems more than any I've worked with, but I have no idea why.

    There is a tool (which I don't have) that cuts a fine groove in the lifter bore to put a bit more oil on the cam and lifter to provide longer life for those.

  8. #7
    carnut is online now Cadillac Owners Master
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    Re: Ht-4100 rwd info

    The cams didnt last because of coolant leaking internally thru failed intake gaskets. It rinses the oil off the lobe, flattening it very quickly. Hard to imagine that someone would repair a leak and not check the cam. The 2.8 V/6 in the S10 Chevys and S15 GMC's had the same issue, infrequent or lack of replacing coolant.

  9. #8
    MrDobin is offline Cadillac Owners Fanatic
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    Re: Ht-4100 rwd info

    Dont buy it. I obsessively looked into these things for a while before I found my FWD Seville. The dangers of the low power RWD just didnt come out worth it. If you got the funds sitting around to redo things extensively hey why not, otherwise I would personally pass.

  10. #9
    steelybill is offline Cadillac Owners Enthusiast
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    Re: Ht-4100 rwd info

    I had a RWD '85 Fleetwood BR. It ran good for the short time we had it. My wife was in a wreck with it..totalled, and almost totalled her, on her way home from work. It did last for 7 weeks !!

    As for driving a RWD or FWD, the FWD, to me, handles a lot better. Maybe it's the rack & pinion steering (?)

    But the FWD is a bitch to work on for anything heavy, and the 4.xx engines sure seem to need work all the time.

    I had two cam failures with my 4.1, with no coolant leaks. It's doing OK now though, and has decent power.

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