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Will new plugs and wires solve a rough running problem at
Will new plugs and wires solve a rough running problem at idle?. Plus the service engine soon light is on and it starts flashing once we hit speeds of 40mph..… read more
Randall C
Randall C
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Vocational, Technical or Trade Scho
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Cadillac Deville: 2005 Cadillac Deville intermittently goes
2005 Cadillac Deville intermittently goes dead on all four coils near radiator. You can unplug the coil master harness plug and makes no difference on idle. When left four coils are dead, car will run… read more
Jerry Newton
Jerry Newton
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Cadillac Seville SLS: My 2001 cad SLS with northstar motor
My 2001 cad SLS with northstar motor has a prblem with the idle... sometimes its normal for a week or so then it will not idle at all for a few days then it idles high and stays that way while driving… read more
Dan
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1990 CADILLAC DEVILLE: 000 miles..driven..other Caddy to garage
1990 CADILLAC DEVILLE IGNITION PROBLEM I bought a Cadillac in Florida that only had 56,000 miles on it and had it in the garage for later use. Car got driven 3 -4 times a year when I went down.. Decid… read more
Eric
Eric
Retired
N/A
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2002 deville: coil pack..throwing the mass air flow sensor code
I have a 2002 Deville DTS....Northstar.. Recently, I have replaced the plugs, boots, rear coil pack....my missing is gone and it is running pretty good.. But it is throwing the mass air flow sensor co… read more
Pete
Pete
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1993 STS: rough..idling..stalling..I have replaced the ICM, Coil Pack
My 1993 STS is rough idling and stalling. The error message are PO25 and PO95. I have replaced the ICM, Coil Pack, Ignition wires and plugs. It ran well for about a week and started rough idling again… read more
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sls..000 miles..000 on it 5500mile synthetic oil changes mostly hiway
I have an 03 sls ld8 y engine i am told. the car has 136,000 miles on it runs strong. bought it used with 48,000 on it 5500mile synthetic oil changes mostly hiway. i take great care of this car but mo… read more
David H
David H
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Seville: Cad..engine may have hg blown..oil pan leak
I am about ready to buy a mint condition 1997 Cad Seville SLS. The engine may have HG blown, needs rear shock and minort oil pan leak. What should I be looking at for $ for a HG replacement for 1 or b… read more
Matt D
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2001 seville sls: Trouble codes p307, num 7 misfire..coil..circuit
2001 seville sls 4.6 northstar. Trouble codes p307, num 7 misfire an p357, num 7 coil circuit problem. Has misfire and runs rough. Replaced 1 3 5 7 coil pac.(near firewall), num 7 plug w/ ac delco pla… read more
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I have a 97 Cadillac STS with NorthStar V8. Car is in mint condition with
I have a '97 Cadillac STS with NorthStar V8. Car is in mint condition with 84K miles. I noticed the Low Coolant indicator and the car started running rough when first started, but smooths out within 1… read more
Randall C
Randall C
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Vocational, Technical or Trade Scho
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94 eldorado: northstar..smoking, white smoke and smells extreamly rich
I have a 94 eldarado with the northstar. It start smoking, white smoke and smells extreamly rich. any suggestions would be greatly appreciated… read more
Dave Nova
Dave Nova
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1994 Cadillac Seville SLS: / North-Star V-8The car starts..miss
I have a 1994 Cadillac Seville SLS w/ North-Star V-8 The car starts without a problem and runs very well. It doesn't lope or miss and when you give it gas it responds wonderfully. It has the North-sta… read more
Mazda Ed
Mazda Ed
Lead Technician
High School or GED
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John a. i may purchase a 1996 sts cad. with 92000 miles.
John a. i may purchase a 1996 sts cad. with 92000 miles. what might be some causes of hard starting and rough operation?? would this be expensive? also could a cadilitic converter smell bad? thanks, b… read more
John
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ASE Certified Technician
2 YEARS COLLEGE
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DeVille DTS: CEL, DTC p300 random misfire,figured changing plugs..oem
03 Cad DeVille DTS 4.6 140k original plugs. Started skipping last week, flashing CEL, DTC po300 random misfire,figured changing plugs w/ oem would correct it. Before changing scanned w/ MT2500 misfire… read more
Jerry Newton
Jerry Newton
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Vocational, Technical or Trade Scho
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deville: cad..ideling high and at stops the rpm goes..ignition cool
I have a 01 cad deville it is ideling high and at stops the rpm goes up and down between 900 to 1500rpm. I have changed the plugs, boot and wires.should Iget the ignition cool for the front and rear? … read more
Steve
Steve
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1997 STS: a litre of coolant 2-300 klms..leaks..smooth
1997 STS Seville northstar using about a litre of coolant 2-300 klms sometimes has a very very toxic smell and white smoke comming out of tail pipes. Have no leaks anywhere and engine does not heat up… read more
Randall C
Randall C
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Vocational, Technical or Trade Scho
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My 1994 cad northstar engine..turn engine..restart
My 1994 cad northstar engine has started white dense smoking on startup along with rough running. I turn engine off and restart, and there will be no problem. This went along for about a month, but no… read more
Auto Go
Auto Go
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Associate Degree
845 satisfied customers
2003 deville: the morning it cranks..white smoke..specs..fuel pressure
I have a 2003 deville and when i try to start it in the morning it cranks alot longer than normal and white smoke fills the garage but all the specs are good with the fuel pressure and craking amps ju… read more
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Steve
Service Manager/ Technician
5,472 satisfied customers
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Meet the Experts:

Jerry Newton

Jerry Newton

Cadillac Technician

1,738 satisfied customers

ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

Dave Nova

Dave Nova

Cadillac Technician

1,522 satisfied customers

ASE Master Certification. GM World Class Certification

Gm Tech (Cam)

Gm Tech (Cam)

Cadillac Mechanic

1,090 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

John

John

ASE Certified Technician

941 satisfied customers

ASE CERTIFICATIONS A1-A8 & L1 / 40 YEARS AUTOMOTIVE EXPERIENCE

Chris (aka- Moose)

Chris (aka- Moose)

Cadillac Technician

811 satisfied customers

16 years of experience

George H.

George H.

ASE Certified Technician

783 satisfied customers

ASE Master Tech 15+ Years

Don - Mo Lurch

Don - Mo Lurch

Cadillac Technician

705 satisfied customers

GM, Cadillac Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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