How JustAnswer Works:

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

Ask Richard Your Own Question

Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 14218
Experience:  12 years at a Jaguar dealer as technician and shop foreman.
10437779
Type Your Jaguar Question Here...
Richard is online now
A new question is answered every 9 seconds

99 jaguar xk8: it going into fail safe mode/reduce performance/ etc

Resolved Question:

99 jaguar xk8, I've had problems with it going into fail safe mode/reduce performance/ etc. I have taken it to the shop countless time and always I get a bill for nothing. Apparently the art of trouble shooting has gone with the invent of the computer. However the throttle body was replaced, but like every other time it seems fine for a couple of weeks then the same faults. At one time the car wouldn't start, it would crank over but seemed like it was almost locking up. I had it haul to a local master mechanic and he said he had to soak it with break fluid to get the compression back up. I had him change the plugs and service the transmission. He told me I just needed to drive the car more (I would if it wouldn't leave on the side of the road). Since then I drove every day for about 2 weeks then the same problem. So today I took the air intake cover off just to check the air filter and look for loose electrical connectors on the throttle body. I notice that with the air intake cover off and the mass air sensor unplugged the car was missing at 2800 RPM. If the mass air sensor unplugged does not cause this miss, other than a bad plug, plug wire, what should I look for that will cause the engine to miss? Also can you tell me where to get a maintenace manual for this vehicle looks like I'm going to need one.

v/r, Ron
Submitted: 3 years ago.
Category: Jaguar
Expert:  Richard replied 3 years ago.

Hello and welcome to justanswer.com

 

So right know the vehicle no longer has a starting problem but does have a missfire when driving? Did the restricted performance warning message come back on?

Customer: replied 3 years ago.

That is correct, it starts fine, and it's misses at exactly 2800 RPM both driving or in park. The restricted performance, with check engine light red or yellow is illuminated, depends on the mood of the car.

Ron

Expert:  Richard replied 3 years ago.
Ok you may have a problem with an ignition coil. Pinpointing which one will be difficult but since the engine light is on this may help. Since that warning came on there should be fault codes stored that the dealer should have been able to read with their scan tool. You can use an OBD II scan tool to retrieve the faults as well. Most parts stores like autozone or pepboys usually do this at no charge. See if you can get a four digit code from the system which may give us an idea of the problem.
Customer: replied 3 years ago.
Pinpointing which one, so each plug has it's own ignition coil and is that something I can replace in my garage? If this is the problem is it possible to pinpoint by removing individual plug wires and listen for a difference in the engine? I will try to make it to a autozone and get back to you with the code information.
Expert:  Richard replied 3 years ago.
Yes each spark plug has it's own coil. They can be replaced very easily. You can remove each one to see if there is a change in engine rpm but before doing that lets get the fault codes. We do not want to induce any codes just yet.
Customer: replied 3 years ago.
Okay I'm back from auto zone, they were able to pull the codes but did not have jaguar info. Here is what they pulled: P0111, P0112, P1229, P0102, P1111. One other issue is that I get a low coolant message, but the coolant reservoir is full.
Expert:  Richard replied 3 years ago.
The fault codes P0111, P0112 and P0102 were induced when you removed the mass air flow sensor. The code P1229 is for the throttle motor. This is usually either a faulty throttle motor or relay. Since you stated you had the throttle replaced this may be covered under a parts warranty if done at the dealer. You could have all those fault codes cleared then scan it again once the warnings come back on.
Customer: replied 3 years ago.

Does either the throttle motor or relay or disconnecting the mass air flow sensor have anything to do with the miss at 2800 RPM?

Expert:  Richard replied 3 years ago.

Not really but since the mass air flow sensor was disconnected it may have fouled the fueling adaptations. Clear all the fault codes and disconnect the negative battery terminal cable for 10 minutes which reset the fuel adaptions.

Customer: replied 3 years ago.
How do I clear the fault codes?
Expert:  Richard replied 3 years ago.
Go back to autozone and have them clear the fault codes.
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 14218
Experience: 12 years at a Jaguar dealer as technician and shop foreman.
Richard and 4 other Jaguar Specialists are ready to help you

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 P Elm City, NC
< Last | Next >
  • 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 P Elm 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. Phil Marysville, 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. Charles Walnut 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!
    Sue Charleston, 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. Jim Castleberry, FL
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Anthony

    ASE Certified Technician

    Satisfied Customers:

    351
    ASE Master Automobile Technician with over 20 years exp. in this field.
< Last | Next >
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    351
    ASE Master Automobile Technician with over 20 years exp. in this field.
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Engineer

    Satisfied Customers:

    295
    Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Jaguar Mechanic

    Satisfied Customers:

    180
    Import Training, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    European Car Expert

    Satisfied Customers:

    170
    ASE & Bosch Certified Master Tech. Over 30 years experience.
  • http://ww2.justanswer.com/uploads/audidoc/2008-12-23_175252_headshot.jpg JagDoc's Avatar

    JagDoc

    European Shop Owner

    Satisfied Customers:

    127
    20 years of experience working with Jaguars. Independent European shop owner and technician.
  • http://ww2.justanswer.com/uploads/jcjcrespo/2009-06-07_193210_xtratech.jpg Juan Crespo's Avatar

    Juan Crespo

    ASE Certified Technician

    Satisfied Customers:

    96
    30+ years experience
  • http://ww2.justanswer.com/uploads/gemmechanic/2009-05-04_110543_dsc07268.jpg gemmechanic's Avatar

    gemmechanic

    Mechanic

    Satisfied Customers:

    84
    Advanced Trade Certificate in Automotive engineering. 30+ years in the automotive industry
 
 
 
Chat Now With A Jaguar Mechanic
Richard
Richard
10090 Satisfied Customers
12 years at a Jaguar dealer as technician and shop foreman.