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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #1
ok on a 94 4.9l sdv were is the fuel pump i was hoping it would be the problem ,,,, when i pull out from a stop and lay into it it sounds like inside the cabine is a grinding/chuggin sound almost like if u put a heavy bolt in a 2l bottle n shook it for about 2 seconds and it does it other times as well like when you go to merge or something if any one has any idea of what this problem may be let me know cuz this has me stumped as of what it is :nono:


but the thing is i doubt it would be the infamous main bearing thump but idk ... never heard it before....
 

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First... your fuel pump is in the tank and it cannot make that kind of sound. Any bottled water in the cabin? No kidding. I know several cases when people forgot something in the cabin or trunk and could not find the problem.
If you hear the sound only under acceleration I would assume your exhaust lines hit the body and make that terrible grinding sound. How are you motor mounts? Open the hood and powerbrake the car in gear (increase RPM in D or R and keep the left foot on the brake pedal FIRMLY). Watch the motor from the driver seat. It should not move more than about 1/2". Checking thing on a hoist (powerbraking carefully) while someone watching th eexhaust lines etc. is the best. It was the only way I could finde the point my exhaust pipe hit a braket under body.
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #3
alright cool thanks for the tip ill get on it tonight to see if thats were its comin from!!
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #4
another thing ive recently noticed but forgot to mention when ever it would make the noice it would slightly lose power would that be caused by the engine mounts?
 

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Dew Barfer said:
another thing ive recently noticed but forgot to mention when ever it would make the noice it would slightly lose power would that be caused by the engine mounts?
No, engine mounts would noy cause loss of power... Is there any corellation with left or right turns? Is it possible your flywheel hits something?
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #6
sorry for how long it took to respond my computer was down.
no it doesnt normally happen around turns but more so on the strait aways when u put a heavy load on the engine exp. pulling out and gunning it to merge w/ traffic but it really only happens around 25-35 mph!?!:suspect:
 

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Sounds like a trans internal problem, possibly a slipping or damaged hard part inside the trans.
Most tranny shops will road test it and give you an idea of what you are looking at for cheap or free.
Dealership will charge you for a diagnostic most likely.
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #9
the tranny fluid is kinda dirty looking and at the top of the hash marks, but other than that by the feel of it, its smooth as silk no debris as far as i could tell at least.........
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #11
im not entirely shure.... but its worth a try but ive heard horror stories from people who flushed the tranny in there 4t60 like the whole thing going w/ in a day or two of the flush any suggestions?
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #13
sorry didn't mean to scare you heh alright do u know how many qt the tranny holds as for when i go to drain her n change the filter? some time soon as to maybe bring some resolute to this problem..


p.s. i really need to get a service manual -- for this kinda information
 

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you can drain no more than 6 QTS despite full capacity is 8 QTS.
The factory sevice manuals are available on ebay all the time for less than $20 Dexron III is fine. Pan bolts -10 lbs.ft.
How many miles on the clock?
 

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"94 sdn deville R.I.P." 91 sedan deville 1978 eldorado
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Discussion Starter #15
she has 134,*** sad part is im not really shure of her history i got her this past march
 

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Servicing a trans with an internal problem is not much of a fix.
Flushing is good, but with high mileage and no history, it might be what finally allows this thing to let go.
Trans services are easy but you sure can make a mess if you are unfamiliar with it. I'd take it someplace and have it done.

If you could take this car somewhere and just let someone drive it and give you an indication of what might be wrong you could really save yourself some trouble.
 
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