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Discussion Starter #1
Hey guys so my grandpa passed away 10 years ago and my cousin took over this 87' coupedeville. I bought it off him 2 years later. car ran perfect because my grandpa would barely drive it unless it was to the liquor store. I got it at 70k miles and it now has 89k. back in 2008 I would drive this car as a pizza boy and again no problems besides water pump and power steering. I went off to school in 2009 and couldn't afford the registration and college expenses. I had no help from family. so I was not driving her for about 2-3 years and the car sat in my grandparents driveway. finally im trying to bring her back to life and I have been for the last few years off and on. with it sitting it caused a lot of problems. cracked brake solenoid or something like that. needed brakes all around from rust. radiator flus tune up tires battery etc. with all that done the car started up in 1 shot. sounds like I remember revs strong and idles perfect.

problem: so after driving for a good 5 minutes everything is normal but then while cruising on the throttle the car starts to lose power in a decelerating motion and the car starts to hesitate or hiccup trying to get power back and sometimes it does but the end result is it always dies and shuts off. I can start it up again but once the car is warm it just repeats itself. sometimes I can cruise for 10 minutes or more and everything seems fine but again history repeats itself.

help: what should I do. im not extremely experienced but im pretty good at research and if directed to do something I can figure it out. I just need a starting point. battery is new. I bought that stuff you put in the gas to help clean injectors but maybe im not giving it enough time. I bought spark plugs so that's my next move. someone said it may be an o2 sensor, crank sensor, or a bad fuse somewhere or coil. any help is greatly appreciated. want to drive my grandpas car again.

my email just in case
[email protected]
 

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White Diamond '03 DHS (with DTS floor shift)
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Re: 87 coupedeville starts, runs, dies after 5 min HELP

problem: so after driving for a good 5 minutes everything is normal but then while cruising on the throttle the car starts to lose power in a decelerating motion and the car starts to hesitate or hiccup trying to get power back and sometimes it does but the end result is it always dies and shuts off. I can start it up again but once the car is warm it just repeats itself. sometimes I can cruise for 10 minutes or more and everything seems fine but again history repeats itself.
Sounds a lot like a weak fuel pump. Check your fuel pressure.
 

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1985 Sedan DeVille
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1,883 Posts
Re: 87 coupedeville starts, runs, dies after 5 min HELP

Air, fuel, spark, pick one

Are there any codes?
 

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Discussion Starter #6
I don't have a sanner but my mechanic who did all my work said there were no codes when he looked at it months ago. I told him my problems and he said its cuz it sat for awhile that the fuel just needs to run through the system and add more gas. ill look into a new fuel pump and change my spark plugs and see what happens. thanks everyone.
 

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1992 DeVille
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2,339 Posts
Yeah my suggestion would be to hook up a fuel pressure gauge and watch the reading. Sick looking car by the way. Super straight, would love to see more pics
 

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1985 Sedan DeVille
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It sounds like timing issue to me. If its temperature related then my initial suspicion would be the ignition control module inside the distributor getting hot. Or possibly the coil. Guessing really
 

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White Diamond '03 DHS (with DTS floor shift)
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I don't have a sanner but my mechanic who did all my work said there were no codes when he looked at it months ago. I told him my problems and he said its cuz it sat for awhile that the fuel just needs to run through the system and add more gas.
:xbs:
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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my money is on a faulty ignition module -

should be easy enough to check for spark when it dies -
 

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1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
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Don't need a scanner to pull codes you can do it thru the dash. Check one of the sticky posts in the top of the FWD deville section.
 
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