Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford

I am trouble shooting a hesitation upon acceleration on a

Customer Question
4.6L, 95 Ford Thunderbird LX...
I am trouble shooting a hesitation upon acceleration on a 4.6L, 95 Ford Thunderbird LX. The symptom includes intermitten back fires, bogging out, no acceleration or slow acceleration as if restricted in gas. I introduce a secondary source of fuel (carb cleaner) while accelerating and it seemed to react to it. In other words it accelerated fine. I checked several components including mass air, vacuum leaks, coils, crank sensor, cam sensors, codes, tps egr and spark plugs, vacuum, calatlytic converters and all checks out. The problem is consistent while it is cold or hot, but I did notice that upon start up the acceleration is normal for about the first two accelerations. After it just gets worse. the can does not shut off but does get a bit shaky. I also noticed that if i turn the ignition switch off and on the acceleration is normal for the first couple accelerations and back to bogging out. Everytime I close the switch and open it, the acceleration returns and goes away. Any suggestions or questions on a solution for this strange symptom?
Submitted: 2 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 31 minutes by:
10/1/2015
Ford Mechanic: 6Bucs, Ford Senior Master replied 2 years ago
6Bucs
6Bucs, Ford Senior Master
Category: Ford
Satisfied Customers: 984
Experience: Ford senior master tech, 18 years experience.
Verified

Hello and thank you for your question. My name is James.

Given the symptom and behavior of the vehicle, have you had a chance to check the fuel pressure yet? Low pressure will cause what you describe. You'll want to see 33 psi minimum. We can chat back and forth here until we get to the bottom of it.

James

Ask Your Own Ford Question
Customer reply replied 2 years ago
Excuse the delay, there was a problem with the response system due to internal mix up. Yes, the fuel pressure checked, with additional 10psi resoponse from Fuel Pressure Regulator when vacuum removed. That was one of my thoughts as well. Psi would also spike upon acceleration. It would never go passed 45psi. I also removed vacuum from regulator to increase pressure but the symptom was still present.
Customer reply replied 2 years ago
I kept an eye on the short term fuel trims while attempting to reproduce the symptom. They showed a good air/fuel mixture of 1% to 2%. While accelerating gradually the trims did begin to compensate for a "lean condition" of about 19%, but when the symptom began the trims went to -9% on both banks and stood there until symptom went away once I released accelerator. At times it would just continue throughout an extended time period or until ignition was cycled.
Another theory of mines led me to determine if an alternator interference was present, so I removed the belt and disconnected regulator and power cable, But still with same Symptom.
Ford Mechanic: 6Bucs, Ford Senior Master replied 2 years ago

Ok thank you. Can you tell me what mass air flow sensor readings you found?

Can you also look at the BARO reading and let me know what it is?

Ask Your Own Ford Question
Customer reply replied 2 years ago
MAF: .79v idle and up to 4.v wot no drop outs.
BARO: 157.6Remember, with engine running with symptom present, If I cycle ignition from off to on, symptoms are no longer present for the following 3-5 seconds.
Customer reply replied 2 years ago
I also disconnected battery to clear any memorized compensating conditions. Another, way I eliminated the possibility of MAF failure, was by turning ignition off and disconnecting MAF, starting engine and seeing if symptom was still present but all remained the same with the same symptom.
Ford Mechanic: 6Bucs, Ford Senior Master replied 2 years ago

Okay thank you. The Baro reading indicates a geographic elevation of about 4600 feet above sea level. Does this sound correct for your location?

Ask Your Own Ford Question
Customer reply replied 2 years ago
That is off by about 4500, 6Bucs, Where did you get those specs from? The elevation of the vehicle is about 72' above sea level. Which would put 157.6Hz at proper Baro pressure-(Read more at: http://www.modularfords.com/content/204-Understanding-Engine-Sensors-Part-3-Barometric-Pressure-Sensor)
Customer reply replied 2 years ago
Can there be some internal (vacuum) leak causing these lean like conditions? Ever heard of any such things? I asked the owner if he had done any work on his car prior to present symptom and he said that he had his transmission changed out 7 days before. I don't see any connection there but thought I should mention it. Awaiting your response.
Customer reply replied 2 years ago
Hello and thank you for your question. My name is ***** ***** . We can chat back and forth here until we get to the bottom of it."Hey James I am not sure what happened but I never received a response after the last message I posted. Did you opt out?
Ask 6Bucs Your Own Question
6Bucs
6Bucs
6Bucs, Ford Senior Master
Category: Ford
Satisfied Customers: 984
984 Satisfied Customers
Experience: Ford senior master tech, 18 years experience.

6Bucs 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:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

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

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,155 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

27,937 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,335 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
Getting spark to distributor but not to spark plugs. 1986
getting spark to distributor but not to spark plugs. 1986 ford ranger. 4 cylinder 2.3 liter engine … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
I'm trying to replace the number 4 spark plug on a 2004 Ford
I'm trying to replace the number 4 spark plug on a 2004 Ford F-150 5.4L v8 Triton engine. It seems like the spark plug socket isn't grabbing the plug, and it just keeps spinning around. … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
Replaced the spark plugs on my 2011 Ford Taurus, but a month
Replaced the spark plugs on my 2011 Ford Taurus, but a month later I got P0305 so I went to autozone and picked up a coil and replaced it. Now a month after that, I have p0205 and p0305. I switched th… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I have a spark plug in an Explorer that is stuck and now the
I have a spark plug in an Explorer that is stuck and now the spark plug is stripped … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
What is a reasonable price for a tune-up and spark plugs
What is a reasonable price for a tune-up and spark plugs that aren't connecting consecutively… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
I week ago, the full set of spark plugs were changed, and
I week ago, the full set of spark plugs were changed, and the gearbox oil replaced. Yesteday, and intense vibration in the engine and and acute noise appear when the car is in D or R, but not when it … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
3 spark plug wires were chewed in half on right side of six
3 spark plug wires were chewed in half on right side of six cylinder, so wanted to doublecheck location on distributor cap … read more
Randall
Randall
Auto Technician / Consultant
Vocational, Technical or Trade Scho
69 satisfied customers
MY 1999 F250 7.3 When cranking engine my alternator charge
MY 1999 F250 7.3 When cranking engine my alternator charge for about 5 min. then stop. Replaced everything Batt, alternator, plug to alternator cant find problem … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
I have a 2001 Ford Escape V6 and one of my spark plugs is
Hello, I have a 2001 Ford Escape V6 and one of my spark plugs is stripped: the 5/8 socket will not grab it. Since the spark plug sits deep in the valve cover I cannot grab it with a vice grip or any o… read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Check engine light after changing spark plugs, stays on,
check engine light after changing spark plugs JA: Does the light stay on, or does it blink? Customer: stays on JA: What is the model/year of your Ford? Customer: 1992 F15 4.9 JA: Are you fixing your v… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,155 satisfied customers
Oil in spark plug well of ford 5.4 Triton engine. 3000
yes, Was told there was blown out plug, so am pulling plugs one by one to check. This is the one passenger side closest to cab … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,000 satisfied customers
Changed the spark plugs that were toasted could not get two
changed the spark plugs that were toasted could not get two out on the far left side. It then would shoot high rpms to 4k rpm, then i changed the Idle air then the throttle position sensor which i onl… read more
Mechanic01
Mechanic01
1,130 satisfied customers
Have 2013 ford fusion 1.6l with 79,000 miles. spark plug
have 2013 ford fusion 1.6l with 79,000 miles. spark plug wont come out and dealership says they have to replace the whole valve at 3700. Engine overheated the other day so we check codes and found the… read more
Gunvir Singh
Gunvir Singh
1,702 satisfied customers
2008 FORD RANGER 2.3L 4 CYLINDER, 4 SPARK PLUGS. REPLACEMENT
2008 FORD RANGER 2.3L 4 CYLINDER, 4 SPARK PLUGS. REPLACEMENT COIL FROM AUTOZONE C1342 DOESNT MATCH LAYOUT OF EXISTING COIL 1S7G-12029-AC. SUPPOSED TO BE DIRECT REPLACEMENT. PLUG ON RIGHT ON BOTH. EXIS… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
27,937 satisfied customers
2006 F150 5.4l, Changed spark plugs and coil packs. runs
Changed spark plugs and coil packs. runs worse than it did before. … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
1985 ford bronco 5.8 eng distributor cap / spark plug
1985 ford bronco 5.8 eng distributor cap / spark plug /wireing order. on the cap. from the black dot. is munber 1 dose it go to the right or to the left and dpse it go in order 1 / 2 / and so on to 8… read more
roy
roy
Associate Degree
3 satisfied customers
I have A ford fusion 4 cylinder changed spark plugs and
I have A ford fusion 4 cylinder changed spark plugs and boots . now I have a shimmy when idle could it be the coils ? … read more
Ron Z.
Ron Z.
Vocational, Technical or Trade Scho
2 satisfied customers
L loosen the spark plug on passenger side and 2nd spark plug
Hi l loosen the spark plug on passenger side and 2nd spark plug from front, l can't pick up .l think it's lean on the side, it's very tight place but l deal with it, then nothink work's. Thank you. It… read more
Kenny Z
Kenny Z
Ford Senior Master Technician
High School or GED
16 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