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Rough idling. Intermittent.... I replaced the MAP and
Intermittent.... I replaced the MAP and cleaned the MAF … read more
Jerry Newton
Jerry Newton
Cadillac Technician
Vocational, Technical or Trade Scho
5,694 satisfied customers
I have a 1994 northstar with poor idle with no load. when
I have a 1994 northstar with poor idle with no load. … read more
Roy
Roy
shop foreman
Associate Degree
4,585 satisfied customers
Cadillac Deville: I have a 1992 Cadillac Deville with a 4.9litre
I have a 1992 Cadillac Deville with a 4.9litre engine. 38,000 miles on the engine. When I start it up it won't start until I press the gas. Then it acts as though it is only running on three cylinders… read more
Eric
Eric
Retired
N/A
33,918 satisfied customers
Cadillac Seville SLS: 97 Northstar engine code running lean
97 Northstar engine code running lean with exhaust fumes in ac air except when ac set on recirculate. exhaust smells bad. idle rough on warm up.… read more
Roy
Roy
shop foreman
Associate Degree
4,585 satisfied customers
Cadillac Deville D'Elegance: small coolant 1998 northstar
small coolant 1998 northstar starts fine rough for 10-15 vseconds then smooth uses quqrt every 10 days or so… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,942 satisfied customers
98 Cadillac Seville: runs fine..occasional shudder..stall..restarts
I have a '98 Cadillac Seville with a Northstar engine, with only 63,300 miles on it. It starts easily every morning, but after 10-15 seconds it starts running rough, shaking, runs rough for the first … read more
Ivan
Ivan
Automotive Instructor
Bachelor's Degree
4,857 satisfied customers
2004 Cadillac DTS: 25,000 miles..rough..service engine light came on
I have a 2004 Cadillac DTS (4.6L Northstar) with 25,000 miles. Other than maintenance (lube, oil) it has never required any shop work. A few months ago the engine idled rough and the "service engine" … read more
David H
David H
Vocational, Technical or Trade Scho
2,678 satisfied customers
Deville: northstar engine..started running rough..idleing..coil packs
I have a o3 deville with northstar engine, It started running rough especially when idleing and would be so bad at times that it would shut off. I changed the plug and wires it still did the same. I t… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,942 satisfied customers
Deville: heater blows neutral tempSystem is pressurized..sys
1998 sedan Deville northstar Overheating Pulled thermostat since it seemed to be circulation issue, heater blows neutral temp System is pressurized. sealed sys., ? is an air pocket or radiator plugged… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
10,970 satisfied customers
2000 sts: northstar..firing..power and could barely climb a hill
I have a 2000 sts with the northstar engine. A few days ago it started to act like the engine wasnt firing quite right. It was lacking in power and could barely climb a hill. I replaced the spark plug… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,942 satisfied customers
2002 Seville: 000 miles..always run..synthetic oil for oil changes
I have a 2002 Seville with 43,000 miles, mint condition. Recently purchased. I have been told to always run synthetic oil for oil changes on Northstars. I also have been told that if you change the oi… read more
carguyjosh
carguyjosh
Associate Degree
2,164 satisfied customers
The car running hot i change the radiator..fans..000 miles
I why to know why is the car running hot i change the radiator, thermastat, replace anti-freeze. fans are working and it still over heats it over heats after it runs for about 15-20 minutes. the engin… read more
David H
David H
Vocational, Technical or Trade Scho
2,678 satisfied customers
1999 Cadillac STS: spark plugs..check engine light..oxygen senor
My 1999 Cadillac STS was doing some rough idiling, and I replaced all eight spark plugs. But its still idiling rough and the check engine light is still on. Does the oxygen senor need to be replaced t… read more
Dave Nova
Dave Nova
Cadillac Technician
Associate Degree
1,522 satisfied customers
check coolant comes..idle the car runs a little rough, but runs great
My warring light for check coolant comes on, I don't see any fluid leaking, at an idle the car runs a little rough, but runs great at high speeds.… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
10,970 satisfied customers
Cadillac Seville sts: Northstar..Oil comes into coolant water
Hello. The car: Cadillac Seville sts year 1994 chassinr. 1G6KY5294RU819838(Northstar) Problem: Oil comes into coolant water. In the expander tank is lots of greycolored stuff. No water in oil, only oi… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
10,970 satisfied customers
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
Auto Technician / Consultant
Vocational, Technical or Trade Scho
12,791 satisfied customers
1999 Cadillac: Touring..coolant, runs rough on start up..smooth..tail
I have a 1999 Cadillac El Dorado Touring. A few weeks ago it started loosing coolant, runs rough on start up but ran smooth after 30 seconds then smoked from both tail pipes for about a minute then st… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
10,970 satisfied customers
1997 cadillac deville: idles rough..white smoke..smoothly..radiator
I have a 1997 Cadillac devile that idles rough after starting and white smoke comes out of the tailpipe after about 3-5 minutes then clears up and rides smoothly. I have also had to replace the radiat… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
10,970 satisfied customers
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Meet the Experts:

Jerry Newton

Jerry Newton

Cadillac Technician

5,694 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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