Cadillac

Cadillac Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Cadillac
This answer was rated:

Cadillac Deville: Diagnostic trouble codes P0171 and P0174

Diagnostic trouble codes P0171 and...
Diagnostic trouble codes P0171 and P0174 have been registered. These are Fuel Trim System Lean Banks 1 and 2 respectively. If I re-set these, they re-appear the next time I am under heavy load. I presume continued operation under these circumstances will result in engine (ie. valve and/or piston) damage. What are possible causes and solutions?

Thanks,

Bill
Show More
Show Less
Ask Your Own Cadillac Question
Answered in 4 minutes by:
7/12/2012
David H
David H, Cadillac Technician
Category: Cadillac
Satisfied Customers: 2,678
Experience: 18 years cadillac dealer.ase master certified.gm master certified
Verified
I would start with a new fuel filter.Also remove the gray engine cover.With the engine idling spray water around the intake manifold pat attention to the area between the throttle body and intake manifold where the rubber plenum boot is.This boot tears and leaks vacuum on all 2001 deville's at some point.To replace the plenum boot requires intake manifold removal and new intake seals as well as the new plenum boot.
Ask Your Own Cadillac Question
Customer reply replied 5 years ago
What am I looking for while spraying the water? Should the idling smooth out? Or am I just looking for the water to disappear into the intake at a leak?
The engine will either start to run very rough or stall out if water hits a vacuum leak.
David H
David H, Cadillac Technician
Category: Cadillac
Satisfied Customers: 2,678
Experience: 18 years cadillac dealer.ase master certified.gm master certified
Verified
David H and 87 other Cadillac Specialists are ready to help you
Ask your own question now
Ask David H Your Own Question
David H
David H
David H, Cadillac Technician
Category: Cadillac
Satisfied Customers: 2,678
2,678 Satisfied Customers
Experience: 18 years cadillac dealer.ase master certified.gm master certified

David H is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Jerry Newton

Jerry Newton

Cadillac Technician

1,569 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

1,003 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

George H.

George H.

ASE Certified Technician

775 satisfied customers

ASE Master Tech 15+ Years

Chris (aka- Moose)

Chris (aka- Moose)

Cadillac Technician

744 satisfied customers

16 years of experience

Don - Mo Lurch

Don - Mo Lurch

Cadillac Technician

690 satisfied customers

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

< Previous | Next >

Related Cadillac Questions
Today a service engine soon light came on on my 2005 Caddi
today a service engine soon light came on on my 2005 Caddi Deville … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
Service engine light soon light is on and blinking. Engine
service engine light soon light is on and blinking. Engine seems to be idling very roughly. … read more
Gm Tech (Cam)
Gm Tech (Cam)
Cadillac Mechanic
Vocational, Technical or Trade Scho
1,003 satisfied customers
Engine turns over & you got fuel & fire but will not start.
engine turns over & you got fuel & fire but will not start … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
My check engine light came on and took it to a mechanic and
my check engine light came on and took it to a mechanic and put like 3 sensors on it.. but today they told me that the duel timing chains were out of sync... ? it drives fine to me, but they said that… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,421 satisfied customers
Check engine light was on, now alarms going off. Stays on
003 , but even though I just got a message from it the engine is hot the temp. Gauge is not showing it's over heating … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
After changing the thermostat it still reads engine coolant
after changing the thermostat it still reads engine coolant hot and the temp gauge moves into the red … read more
ggrote1
ggrote1
Vocational, Technical or Trade Scho
13 satisfied customers
My check engine and stabillatrak light are on the dashboard.
My check engine and stabillatrak light are on the dashboard. The transmission works in all gears but won't allow the car to do more than 27mph. Won't recognize sportier (manual)… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Gas is getting to fuel filter, ive replaced the fuel relay
gas is getting to fuel filter, ive replaced the fuel relay fuse and filter. the truck will start with ethenol, or starting fluid. but will not start with just gas … read more
roy
roy
Associate Degree
3 satisfied customers
Service engine light keeps coming on (not check engine).
Service engine light keeps coming on (not check engine). What could this be? I had Meineke check it and they told me it was the computer. I had it replaced and the light still comes on. I replaced the… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
The engine of my 2006 cadillac cts was changed by an engine
the engine of my 2006 cadillac cts was changed by an engine of a 2008 cts the car worked very well for 11 months, a month later I had to try 2/3 to start the car, then it was not possible to turn it o… read more
Michael Solis
Michael Solis
363 satisfied customers
I have a 1995 cadillac sts a north star engine. Last couple
I have a 1995 cadillac sts a north star engine. Last couple weeks it has become hard starting. 10-15 seconds, after it starts it runs great???? … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
A knocking noise on the driver side of the engine. For a
a knocking noise on the driver side of the engine JA: Where exactly do you think the noise is coming from? And how long has this been going on? Customer: for a month sounds like in the bottom the engi… read more
Jerry Newton
Jerry Newton
Cadillac Technician
Vocational, Technical or Trade Scho
1,569 satisfied customers
Same problem as Pete, roaring engine, feels like driving in
Same problem as Pete, roaring engine, feels like driving in low gear, sluggish and jumpy acceleration … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a '86 Cadillac Cimarron 2.8 engine. Engine cranks and
I have a '86 Cadillac Cimarron 2.8 engine. Engine cranks and has a hard time starting. After it starts it idles rough and there is a bit of lost power. … read more
Dan
Dan
Auto Mechanics 1&2/diesel mech
0 satisfied customers
I just changed the fuel filter on my 2009 cadillac sts, now
I just changed the fuel filter on my 2009 cadillac sts, now it won't start, it just clicks … read more
Mechanic01
Mechanic01
1,700 satisfied customers
Need to change the fuel filter on my 2010 sex, not sure,
need to change the fuel filter on my 2010 sex JA: Is the fuel filter an external one, or is it inside the tank? Customer: not sure JA: What is the model of your '10 Cadillac? Customer: 2010 sex 3.0 JA… read more
Gunvir Singh
Gunvir Singh
1,817 satisfied customers
I have a 1996 cadillac eldorado i pulled the fuel filter on
i have a 1996 cadillac eldorado i pulled the fuel filter on one side put a test after the filter it read 80 psi would trickle down to 55 psi in 10 minutes. than i put the same test on the fuel rail it… read more
Matt
Matt
Engineer
Bachelor\u0027s Degree
5 satisfied customers
94 Cadillac SLS: Changing the fuel filter. How do I
94 Cadillac SLS: Changing the fuel filter. How do I disconnect the quick connects on the plastic lines?… read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x