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1993 deville bogging down
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mike93
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Apr 14, 2010, 1:42 PM
Post #1 of 12
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1993 deville bogging down
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Hi everyone I have a 1993 Cadillac Deville with 104,000 miles with a 4.9 at low speeds hot or cold when i let off the gas and re apply the gas the car bogs down and shakes real a little bit when holding my foot on the gas trying to give it more gas the car has a rebuilt transmission that was done 7 months ago but what is wierd it bogs down at like 25mph and up and once goes lower then 25mph and u feel it down shifts it goes away then once up to 25mph or more the car bogs down again the car has had a full tune up egr valve replaced tps sensor replaced everything has been replaced fuel filter, catalytic converter had a compresssion test done everything was fine please help me oh and also I have no diagnostic codes.
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re-tired
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/ Moderator
Apr 14, 2010, 5:27 PM
Post #2 of 12
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Re: 1993 deville bogging down
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You may get lucky . A lot of caddy's have these symptoms . The following repair has fixed several dozen caddy's for me . Follow the main ground wire from battery to the front of engine . It should mount on a stud just in front of the starter . Remove cable and stud , clean everything including block REAL GOOD . Clean battery terminals . Let us know if it helps.
LIFE'S SHORT GO FISH
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mike93
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Apr 14, 2010, 8:38 PM
Post #3 of 12
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Re: 1993 deville bogging down
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ok so the wire that goes in front of the starter take off and clen that battery terminals are cleaned but will clean again but the stud and cable in front of the starter take off and clean? thanks
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re-tired
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/ Moderator
Apr 14, 2010, 9:14 PM
Post #4 of 12
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Re: 1993 deville bogging down
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There's no guarantee that this will fix. On older caddy's if this ground gets the least bit loose or corroded it will drive the sensors on the eng crazy, anytime you put additional electrical demand i.e. accelerating, turning on ac etc . The eng goes bonkers.
LIFE'S SHORT GO FISH
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mike93
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Apr 14, 2010, 9:28 PM
Post #5 of 12
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Re: 1993 deville bogging down
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Ahh it's worth a try maybe and hopefully it will fix it but if not any other ideas on what it could be? thanks
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mike93
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Apr 19, 2010, 10:20 AM
Post #6 of 12
(1743 views)
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Re: 1993 deville bogging down
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Hi everyone im still having trouble but let me explain a little better now when the car bogs down and shakes a lil it feels like the car is in cruise control for a second or two because the car moves by it's self when it's bogging down without my foot on the pedal it feels like the car is in torque converter lock up but at the wrong times they had told me after the rebuilt the transmission that they didn't change any of the solenoids but what do you think please help thanks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 19, 2010, 10:51 AM
Post #7 of 12
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Re: 1993 deville bogging down
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Anything could be but the question is did you do what R-T suggested?
By that if confused, it means follow battery ground cable to the engine and clean that up - wire brush, sandpaper - whatever works to get that perfect. Then I'd look to find a strap going from either battery directly or engine to probably firewall to ground it securely as well. Block and metal of car's body need good ground.
R-T has mentioned this quirk a few times here for funky acting problems and that was the solution to most from what I've read from those who came back to say one way or the other.
If you can't find these then add a good one out of every-thing's way from block to body. There are enough existing items to double up use of a bolt for that. No harm done if it fails to fix the problem.
Verbose as I am, body will get some ground thru silly things like throttle cable housings and little stuff but not enough. Most of that stuff is well insulated NOT to be a ground.
Agreed - it's too bad the sensors in trans were not all done when it was rebuilt but this could rule out this part,
T
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mike93
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Apr 19, 2010, 12:37 PM
Post #8 of 12
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Re: 1993 deville bogging down
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yeah didn't try that yet a little confused but i understand now the ground is on the starter from the battery? yeah and im gonna change the solenoids myself soon
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 19, 2010, 1:58 PM
Post #9 of 12
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Re: 1993 deville bogging down
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NO! Positive goes to the starter! Better said - starter solenoid which is on top of it on most. Look at battery for indications of which is which - words like "neg" or just the "-" minus sign, color is frequently black for negative, red for positive but could be both black if changed since new??
Don't get those confused or hooked up wrong. Don't have enough headache medicine for what that can do
T
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mike93
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Apr 19, 2010, 2:20 PM
Post #10 of 12
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Re: 1993 deville bogging down
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Ok so it's the negative ground i need to follow and clean but yeah im gonna do that but it's really weird when the car downshifts from second to first it stops bogging down
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 19, 2010, 2:54 PM
Post #11 of 12
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Re: 1993 deville bogging down
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Correct. This whole thing is to rule that out as the source of the trouble and hope it is that simple and cheap. May not but as R-T (re-tired) has mentioned, so many strange issues have been just that,
T
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mike93
User
Apr 19, 2010, 2:57 PM
Post #12 of 12
(1722 views)
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Re: 1993 deville bogging down
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ok i will try that and will let you know
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