Car

Ask a Mechanic Online and Get Answers to Your Car Questions

Ask an Expert,
Get an Answer ASAP!

Car
This answer was rated:

1989 GMC: idles..rough..a very low RPM to a Higher speed..injector

A 1989 GMC Jimmy idles...
A 1989 GMC Jimmy idles very rough, but will run well on the road. The idle is like an oscellation from a very low RPM to a Higher speed. I got a fuel cleaning/injector service but so far it still idles roughly although it seems to be improved somewhat. Do you have a probable cause?
Show More
Show Less
Ask Your Own Car Question
Answered in 7 minutes by:
12/1/2008
Golden Wrench
Golden Wrench, Shop Foreman
Category: Car
Satisfied Customers: 348
Experience: ASE 30 Years of fixing severly broken cars and light trucks
Verified
I'm GW. Is the check engine lite on?
Ask Your Own Car Question
Customer reply replied 9 years ago
No there is no check engine light on. The truck has not been driven much. It is in the garage most of the time, but has run well before.
You may want to check for a vacuum leak at the rear of the throttle body gasket.
Ask Your Own Car Question
Customer reply replied 9 years ago
I went out this afternoon and checked every vacuum hose that I could find that comes out of the housing where the fuel is being induced and I could not find any that appeared to be loosing vacuum. When I removed the hoses and covered the port they were connected to with my finger, I could feel the suction. I am not sure where the location is that you say to check for vacuum loss. It may be somewhere other that the connections I see that pull a vacuum, I don 't know. I really didn't see anything I thought was a problem. Maybe I'll need a mechanic with instruments and know-how to find it if it is a vacuum leak. I'll agree that a vacuum leak seems to be a likely cause because when the engine is ideling tha vacuum is considerably less than when the engine is at the running RPM. That could account for the fact that it runs OK on the road because while the engine is running faster it overcomes any possible vacuum leak.
The vacuum leak usually occurs when the base gasket pulls through. You can hear it. Or spray wd-40 at the back of the throttle body, and if the engine smoothes, it's leaking.
Golden Wrench
Golden Wrench, Shop Foreman
Category: Car
Satisfied Customers: 348
Experience: ASE 30 Years of fixing severly broken cars and light trucks
Verified
Golden Wrench and 87 other Car Specialists are ready to help you
Ask your own question now
Customer reply replied 9 years ago

I think I see the gasket you are talking about now. I sprayed WD-40 around it and after a short delay noticed the engine did run a bit smoother. I think it may be the gasket although the engine will sometimes run quite smooth on its own for a short time so I'm still not certain that is the only problem. As an expert, do you think the replacement of this gasket is a job that should be undertaken only by a trained mechanic or could it be done by a somewhat mechanically inclined person who can do some minor repairs and upkeep. The throttle assembly seems to be held in by 3 bolts into the engine block. If these are removed can you lift it to replace the gasket after disconnecting the attached hoses and linkages. My concern is that these holdown bolts have been in there for 20 years and may be very difficult to deal with.

 

I do value your help and will not skip out on payment!

 

Yes, you can, just be sure to clean the old gasket off the manifold anf tbi unit. Easy repair. GW
Ask Your Own Car Question
Let me know how it goes. GW
Ask Your Own Car Question
Customer reply replied 9 years ago
Thanks a lot. I don't think I'll be able to do anything until after New Years. I want to allow plenty of time.
OK. GW
Ask Your Own Car Question
Ask Golden Wrench Your Own Question
Golden Wrench
Golden Wrench
Golden Wrench, Shop Foreman
Category: Car
Satisfied Customers: 348
348 Satisfied Customers
Experience: ASE 30 Years of fixing severly broken cars and light trucks

Golden Wrench 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:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time!

Paul MCorpus Christi, TX

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Technician

1,243 satisfied customers

16 years of experience

Ted G.

Ted G.

ASE Certified Technician

1,724 satisfied customers

20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

George H.

George H.

ASE Certified Technician

1,537 satisfied customers

ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

GM Tech (Cam)

GM Tech (Cam)

Auto Service Tech

669 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Amedee

Amedee

Former ASE Master Tech

2,520 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Jerry

Jerry

Master Mechanic

2,181 satisfied customers

ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager

Richard

Richard

ASE Certified Technician

1,000 satisfied customers

12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes

< Previous | Next >

Related Car Questions
I hook up the charger to the battery in my truck set the
I hook up the charger to the battery in my truck set the charge on 12V and as soon as it is pluged in the amp needle jumps to 4-5 then 0 back and forth and does not stop until it is disconected. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Need an enclosed trailer to haul aglide and a honda rancher
Need an enclosed trailer to haul a*****glide and a honda rancher 4x4 and maybe some kyaks. Looking for any sugguestions and insight… read more
Mechanic01
Mechanic01
1,736 satisfied customers
1094 Isuzu Trooper heater blower motor and how to find it.
1094 Isuzu Trooper heater blower motor and how to find it. To replace it. … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
My truck is in line so why is my steering wheel not in line
My truck is in line so why is my steering wheel not in line it sets cock to the left so if i adjust my tie rodes will it run side ways… read more
vwtech0405
vwtech0405
VW Technician
Associate Degree
8,868 satisfied customers
My 2010 odyssey sliding door on the driver side will open
My 2010 odyssey sliding door on the driver side will open some times but not always . Then after a few days will start working again … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a 2002 Toyota Solara. I just noticed that one of my
I have a 2002 Toyota Solara. I just noticed that one of my headlights is out. What should it cost at a shop to replace the bulb?… read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
Losing power checked with code reader P0113 intake temp
losing power checked with code reader P0113 intake temp sensor … read more
Cesar Jimenez
Cesar Jimenez
Owner/CEO
Vocational, Technical or Trade School
111 satisfied customers
Audi Q5 front brakes worn down after only 11,000 miles.
Audi Q5 front brakes worn down after only 11,000 miles. Sounds strange to me. … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Cant get back sliding door open passenger. just makes noise
Cant get back sliding door open passenger. just makes noise but will not open. … read more
Dan
Dan
Dealership Technician
Associate Degree
1,786 satisfied customers
I need to talk personally to a mechanic about my situation
I need to talk personally to a mechanic about my situation they would be a lot of typing and it would be much agers just to call the technician … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
I just bought a 1995 Damon Ultrasport. There are three
I just bought a 1995 Damon Ultrasport. There are three switches on the steps going into the RV. Two are white and one is red. What do they go to? … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
Code po344 in a 2012 Chrysler 300 3.6. Camshaft sensor. I
code po344 in a 2012 Chrysler 300 3.6 JA: Just to clarify, what's the exact code? And have you tried to reset it? Customer: camshaft sensor JA: Are you fixing your 300 yourself? What have you tried so… read more
Curtis
Curtis
Vocational, Technical or Trade Scho
1,694 satisfied customers
The car wont turn over the batt is up I make the starter
the car wont turn over the batt is up I make the starter crank by crossin the stater solenoid where to look? … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,429 satisfied customers
2000 Toyota Sienna 3.0 Had multiple cylinder misfire 1-6 as
2000 Toyota Sienna 3.0 Had multiple cylinder misfire 1-6 as well as lean bank one..... Changed Plugs,Wires, and engine air filter... Cleared codes and lean bank one is still coming back. Vehicle has n… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,429 satisfied customers
We set the timing according to the diagram. Once it was all
Eric, We set the timing according to the diagram. Once it was all together, we started the vehicle and cylinder 4 and 5 were misfiring with no cam crank corillation codes, just misfire. We pulled the … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
I have a 2007 Hyundai Sonata NF Elite and it's done 117000
I have a 2007 Hyundai Sonata NF Elite and it's done 117000 kms. I've just been asked if the timing belt has been replaced as I"m trying to sell it but it doesn't appear so. Was it due at 90000? … read more
George H.
George H.
ASE Certified Technician
Associate Degree
1,537 satisfied customers
Have an 04 Navigator 4WD crank no start, suspect FPDM but
Hey, have an 04 Navigator 4WD crank no start, suspect FPDM but have looked under rear can not find it, where is it located. … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,429 satisfied customers
My 1959 Plymouth Sport Fury has a Kelsey- oval bellows brake
My 1959 Plymouth Sport Fury has a Kelsey-Hayes oval bellows brake booster, which was rebuilt in 9/13. At cruisn' the coast in 10/17 booster "locked up". Had to disconnect vacuum line to release. Recon… read more
roy
roy
Associate Degree
3 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