99 Seville - Rough Idle at Startup

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99 Seville - Rough Idle at Startup

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Cadillac Forum >> Cadillac Models >> Cadillac Seville >> 99 Seville - Rough Idle at Startup

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99 Seville - Rough Idle at Startup - 6/24/2008 3:20:44 PM

dtabbert

Posts: 2
Joined: 6/24/2008
Status: offline

My Seville idles very rough after starting (whole car shakes). After driving for a bit (mile or so) it smooths out. This only happens once every couple of months or so. Seems to occur after the car has sat unused for a few days, though this is not always the case. The car has been doing this for the past 3 years since I bought it (purchased with 55K miles on it, today it has 110K). Any idea on what could be the cause of this intermittent problem or a fix? There are no warnings or indicators flashing saying there is a problem.

< Message edited by dtabbert -- 6/24/2008 3:37:06 PM >

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DRT

Post #: 1

RE: 99 Seville - Rough Idle at Startup - 6/24/2008 7:44:43 PM

Katzmans Caddy

Posts: 1162
Joined: 12/3/2006
Status: online

I am going to suggest the basic tune up items:
1. Spark Plugs
2. Wires
3. Coils
4. Fuel Filter
5. Air Filter
6. Clean Mass Air Flow (special cleaner in aerosol)

(in reply to dtabbert)

Post #: 2

RE: 99 Seville - Rough Idle at Startup - 6/25/2008 9:46:14 AM

carnut

Posts: 303
Joined: 2/23/2008
Status: offline

My thought is a sticking injector. By sticking, I mean sticking closed or sticking open overnight so one cylinder floods. Sticking closed would cause a miss on the cyl. not getting fuel. Sticking open overnight would allow fuel to drip thereby flooding a cylinder. depending on duration, it might not set a code. So try some "SEAFOAM" fuel treatment to clean the injectors.

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2 1984 Eldos, 1991 Allante, 88 Allante (sold)

(in reply to Katzmans Caddy)

Post #: 3

RE: 99 Seville - Rough Idle at Startup - 6/26/2008 7:13:06 PM

Katzmans Caddy

Posts: 1162
Joined: 12/3/2006
Status: online

quote:

ORIGINAL: carnut
So try some "SEAFOAM" fuel treatment to clean the injectors.

I think this is a good suggestion.

(in reply to carnut)

Post #: 4

RE: 99 Seville - Rough Idle at Startup - 6/28/2008 3:34:06 PM

dtabbert

Posts: 2
Joined: 6/24/2008
Status: offline

Tried the tuneup (around 100K miles), did not fix it. Will try the Seafoam suggestion.

Thanks a bunch for the suggestions!! I let you know how it turns out.

(in reply to Katzmans Caddy)

Post #: 5