Cadillac

Cadillac repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

My 92 cadillac deville 4.9 it idles ok when you put in drive…

Customer Question
My 92 cadillac deville...

My 92 cadillac deville 4.9 it idles ok when you put in drive and accelerate it boggs down get of gas and drive normal it ok and then when you give it more gas it will not accelerate i have done a complete tuneup and changed the whole distributor and fuel pump and filter but it still does it can you help

Mechanic's Assistant: Have you ever replaced the fuel pump, or is this the original?

New fuel pump and filter

Mechanic's Assistant: Are you fixing your DeVille yourself? What have you tried so far?

Complete tuneup, fuel pump and fuel filter and new distributor

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Im at whitts end

Submitted: 1 year ago.Category: Cadillac
Show More
Show Less
Ask Your Own Cadillac Question
Answered in 1 hour by:
3/22/2017
Cadillac Mechanic: Amedee, Cadillac Technician replied 1 year ago
Amedee
Amedee, Cadillac Technician
Category: Cadillac
Satisfied Customers: 28,116
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome!

My name isCustomerand I can assist you with your question.

Ask Your Own Cadillac Question
Cadillac Mechanic: Amedee, Cadillac Technician replied 1 year ago

I will try my best to answer all of your questions.

However, before we get started, please let me mention a few things.

1. If at any point you would like to speak on the phone, please feel free to request a phone call on your end and I can call you right away.

2. If you dont understand any technical terms or anything that I mention (component tests or theory or operation), please let me know and I will provide you with a more in debt explanation or answer.

3. Please understand that I am here to help you anyway I can.

Ask Your Own Cadillac Question
Cadillac Mechanic: Amedee, Cadillac Technician replied 1 year ago

Are you looking for possible causes or would you like me to walk you through this diagnoses?

Have you checked for codes in the computer?

Ask Your Own Cadillac Question
Customer reply replied 1 year ago

Do not have any, no lights on

Cadillac Mechanic: Amedee, Cadillac Technician replied 1 year ago

Hello and thank you for that information.

Based on my experience, the two most common causes for this condition are low fuel pressure and plulgged exhaust. You said the fuel pump and filter were replaced? If so, what is the fuel pressure at under a load?

Also, what is the engine vacuum at or exhaust back pressure readings at?

Another possible cause would be fuel injectors. The fuel injectors could be bad or they may not be opening up enough to allow enough fuel into the engine. This would be based on a computer input. For example, the MAP sensor or TPS could be bad. I would check both sensors and signals at idle and under a load.

Ask Your Own Cadillac Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a cadillac mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Amedee Your Own Question
Amedee
Amedee
Amedee, Cadillac Technician
Category: Cadillac
Satisfied Customers: 28,116
28,116 Satisfied Customers
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector

Amedee 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

1,730 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

1,075 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

795 satisfied customers

16 years of experience

George H.

George H.

ASE Certified Technician

781 satisfied customers

ASE Master Tech 15+ Years

Don - Mo Lurch

Don - Mo Lurch

Cadillac Technician

704 satisfied customers

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

< Previous | Next >

Related Cadillac Questions
I have a 1993 Cadillac Deville 4.9 liter engine. Traveling
I have a 1993 Cadillac Deville 4.9 liter engine. Traveling on the Interstate the car just started losing power and bucking and jerking and spitting and back firing until it finally cut off. I was able… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,639 satisfied customers
My 91 Cadillac Deville will run if the motor has been
My 91 Cadillac Deville will run if the motor has been setting for awhile, or is cold but as soon as it get warm or operating temperature, it starts missing bogs down then won't idle or pull itself whe… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,426 satisfied customers
Cadillac brougham: I have a 1990 cadillac brougham 5.7 with
I have a 1990 cadillac brougham 5.7 with 30,000 miles in mint condition. The car has had 360 miles put on it in the last 12 years. The car runs rough, feels like its starving for fuel, and when heavy … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
Cadillac Deville DHS: Had to have car towed as quit shortly
Had to have car towed as quit shortly after filling tank with gas. Serviceman says there is water in gas and has taken a sample of the gas for us. How expensive might this end up? Cadillac Deville DHS… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Cadillac Deville: I have a 1991 Cadillac Deville with the 4.9
I have a 1991 Cadillac Deville with the 4.9 V8. It started missing so I took it to a local mechanic and he changed the spark plugs, spark plug wires, new rotor at Distributor. It still missed. He took… read more
Jerry Newton
Jerry Newton
Cadillac Technician
Vocational, Technical or Trade Scho
1,730 satisfied customers
Cadillac Deville: I have a 92 Cadillac Coupe DeVille runs good
I have a 92 Cadillac Coupe DeVille runs good new plugs and wiresafter about 1 mile cuts off and if you have cut the gas off could it be the fuel. pump are something else then I can crank it up run may… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 1989 cadillac deville, Ive replaced several parts
I have a 1989 cadillac deville, I've replaced several parts on it including a fuel pump and the car will run but it has trouble pulling once you drive it. Wont go over 20 ml it's like it's not getting… read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
1994 Deville: mph..ignition module, coil, cap, rotor, plugs wires
1994 Deville 4.9 standard engine / Problems: Engine cuts off @ stops / RPM tacks up to about 3500 at start ups then slows but still above normal / High idle will not release until braked to 4 mph. / H… read more
Jerry Newton
Jerry Newton
Cadillac Technician
Vocational, Technical or Trade Scho
1,730 satisfied customers
1999 Cadillac Deville: 20 minutes..the engine started..acceleration
My 1999 Cadillac Deville Concours killed on me yesterday and the only warning i had was it seemed to begin to idle rough then when i accelerated it died. after about 20 minutes and some begging, the e… read more
supermechanic
supermechanic
Service consultant
Vocational, Technical or Trade Scho
10 satisfied customers
1991 cadillac: rotor..throttle body..idling, its erratic..gas pedal
i have a 1991 cadillac with a 4.9 just got major tune up consisting of p;ugs, wires, distributor cap, rotor, ignition module, ignition coil, pcv valve, i also have had the throttle body removed and cl… read more
JHoop
JHoop
Owner,Technician
High School or GED
93 Cadillac Allante: boggs-down..fuel pressure loss issue..cold start
I have a 93 Cadillac Allante. I replaced the FPR but now the car boggs-down when I get on it. I changed the FPR to resolve a fuel pressure loss issue but on initial cold start this issue is still pres… read more
Dave Nova
Dave Nova
Cadillac Technician
Associate Degree
1,522 satisfied customers
sedan..blows..diagnostic..wires, rotor, distributor cap, map sensor
Year : 1993 Make : Cadillac Model : sedan deville Engine : 4.9 My car appears to run fantastic for a couple hundred miles then it shows some hesitation, loses power, misses, backfires and blows apart … read more
John
John
ASE Certified Technician
2 YEARS COLLEGE
941 satisfied customers
sixty special: hot outside..50 - 60 miles..face durring acceleration
I have a 1992 Fleetwood sixty special, with the 4.9. When it is hot outside ( 85 plus dg ) and I drive it for 50 - 60 miles it starts to fall on it's face durring acceleration. If I pull over and shut… read more
Vladgmru
Vladgmru
Automotive Electrician
Vocational, Technical or Trade Scho
1,586 satisfied customers
1986 Cadillac Deville: accelerating..new fuel pump, new fuel filter
History: 1986 Cadillac Deville, set up without driving a lot. 2 years ago, started going dead when accelerating. Local mechanic empted and cleaned fuel tank, new fuel put in. 3 months later still goin… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
1995 Cadillac: Sedan Deville..the accelerator to keep it running..idle
My 1995 Cadillac Sedan Deville is having trouble staying running after starting. I have to tap the accelerator to keep it running. It will not idle. I've changed the in-line fuel filter. The spark plu… read more
supermechanic
supermechanic
Service consultant
Vocational, Technical or Trade Scho
10 satisfied customers
Cadillac deville: the computer, o2 sensor, map..TPS..EGR..distributor
i have a 94 4.9 cadillac deville (Not the Northstar) , low mileage which has an intermittent stumbling problem and at times completely cuts out like it is running out of gas. I have replaced all the e… read more
rpmdiag
rpmdiag
High school
7,747 satisfied customers
1983 Cadillac Deville: accelerator..spark plugs..throttle body gasket
I have a 1983 Cadillac Deville 4.1LHT When i start it idles high and low. When i put it in drive and push down the accelerator it starts to cut out and "choke". I have replaced the spark plugs and the… read more
rpmdiag
rpmdiag
High school
7,747 satisfied customers
1991 Cadillac DeVille: throttle body..air cleaner housing..accelerates
I have a 1991 Cadillac DeVille. 4.9 engine. I just cleaned the inside of the throttle body and put the air cleaner housing back on and now the engine accelerates on its own . I just tap the accelerato… 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