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Missing going down the road. just changed the coil pack on
missing going down the road. just changed the coil pack on the front of the northstar due to p300 and p304 codes. smoothed it out at idle now rough going down the road … read more
Clayso
Clayso
Shop Owner Master Technician
ASE Master Certified Automobile Technician
879 satisfied customers
Same seldom used 01 DeVille now 53,000 miles, Has 171 and
Same seldom used 01 DeVille now 53,000 miles, Has 171 and 174 codes, lean mixture both banks. Cleared codes went 14 miles and light came back on 171, 174 codes. Put in 2 containers of injector cleaner… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,904 satisfied customers
i am work on a 2003 cadille deville 32 northstar v-8 and i
i am work on a 2003 cadille deville 32 northstar v-8 and i have cod one is po174 and po171 now troubleshooting i thingit the mass air flow sensor ok whart do you thark… read more
GMWrencher
GMWrencher
Associate Degree
410 satisfied customers
Cadillac Deville: I have a difficult-to-diagnose rough idle
I have a difficult-to-diagnose rough idle problem with a 2002 Cadillac Deville with the 4.6L Northstar engine. It idles perfectly when first started cold. However, after about 5 minutes (switching to … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
29,922 satisfied customers
Greetings - 2001 Eldo ETC: Codes PO171 & 174. 1st occurred
Greetings - 2001 Eldo ETC: Codes PO171 & 174. 1st occurred near the end of aXXXXXwhen the wife stopped for fuel. Checked the usual suspects: MAF, PCV, and Plenum. No apparent vacuum leaks, not stutter… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,904 satisfied customers
Cadillac Seville: my check engine light came on i got it
my check engine light came on i got it checked out code i was given was oxygen sensors and random miss fire the mechanic told me that he thought the random miss fire was causing the O2 codes to kickou… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,904 satisfied customers
pm151: also surges at stop lights if that helps..po171
getting a po151 code car also surges at stop lights if that helps if this is connected also getting a po171 and 174 if thats also connected… read more
Paul M ASE Master
Paul M ASE Master
Automotive College
4,537 satisfied customers
Cadillac: check engine light..low voltage..174 ( fuel trim system lean
I have a 99 sls cadillac and I am getting a check engine light with these codes a P0131 (ho2s low voltage bank one sensor 1) also a PO171 and 174 ( fuel trim system lean, bank 1 and 2) how do I correc… read more
Neal
Neal
Auto repair pro, 30 years experience
Associate Degree
8,213 satisfied customers
miles per..my 03..tires are up new filter (K&N) same driving habits
Why do I get 6 to 8 miles per gal. less on my 03 that I did on my 2 98's? it has 45K on it, tires are up new filter (K&N) same driving habits same oil? same driver? Checked out front end, I am willing… read more
David H
David H
Vocational, Technical or Trade Scho
2,678 satisfied customers
2003 Cadillac: recall..the replacement of fuel tank presure..PO171
I was told there was recall on 2003 Cadillac for the replacement of fuel tank presure sensor. I called Cadillac they said my car was replaced. A retired Cadillac person said if I had a problem with th… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,904 satisfied customers
2003 Cadillac Seville: stall..Check engine light came..o2 sensors
Have a 2003 Cadillac Seville. Car seemed to stall. Check engine light came on checked codes and changed both upstream o2 sensors. Changed mass air sensor, but now when unplug mass air sensor car runs … read more
George H.
George H.
ASE Certified Technician
Associate Degree
783 satisfied customers
2004 cadillac deville: 56,000 miles..my check engine..lean..light came
I have a 2004 cadillac deville with 56,000 miles on it my check engine lite came on. I have installe my test meter and the codes that came up were 0171 and 0174 lean burn on both banks. I cleared the … read more
David H
David H
Vocational, Technical or Trade Scho
2,678 satisfied customers
2000 Cadillac: northstar..rough..idels codes p300 po171
I have a 2000 Cadillac with northstar engine it idols rough and sounds like it loops only when idels codes po300 po171 po174… read more
david
david
Heavy Duty Repair Mechanic
Vocational, Technical or Trade Scho
500 satisfied customers
2001 cadillac eldorado etc: 8/7 failed ny inspection
2001 cadillac eldorado etc-1g6et12911b101894 purchased 7/21/10 n.j. car. on 8/7 failed ny inspection. po135 o2 sensor heater circuit bank 1 sensor 1.po171-systemtoo lean b ank1 po174 system too lean b… read more
Dave Nova
Dave Nova
Cadillac Technician
Associate Degree
1,522 satisfied customers
My 03 sls idles very low..choke..air conditioner..stalls
My 03 sls idles very low. When choke and air conditioner are on the idle is okay but when idling otherwise the idle is very low and the vehicle nearly stalls. What could cause this?… read more
Dave Nova
Dave Nova
Cadillac Technician
Associate Degree
1,522 satisfied customers
2001 Deville: lean..MAF sensor..vacuum lines..the intake
2001 Deville, getting lean burn errors on banks 1 & 2, replaced the MAF sensor but error condition persits. Visually inspeced vacuum lines but see no problems however only aware of the PVC line and a … read more
George H.
George H.
ASE Certified Technician
Associate Degree
783 satisfied customers
i am getting a pcm code p0171 and p0174 fuel trim lean bank
i am getting a pcm code p0171 and p0174 fuel trim lean bank 1 and bank 2. any idea on how to fix this? also i cannot get the engine cover back on. It is an 04 deville. Thx… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,904 satisfied customers
2000 Cadillac DTS: lean..missfire..Car is idling at 900..RPM.
2000 Cadillac DTS 4.6 MIL is on PO171 bank one lean PO174 bank two lean PO300 random multiple missfire I've checked for obvious vacuum leaks and can't find any. Car is idling at 900 RPM. I unhooked th… read more
chuckoly
chuckoly
Director of Diagnosic & Technical Suppor
Associate Degree
6 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

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1,522 satisfied customers

ASE Master Certification. GM World Class Certification

Gm Tech (Cam)

Gm Tech (Cam)

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30,513 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)

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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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