I have a 99 jaguar xjr that keeps throwing a code for random cylinder misfire. It has singled out several times the num

Expert's Assistant chatimg
Customer: i have a 99 jaguar xjr that keeps throwing a code for random cylinder misfire. It has singled out several times the num 1 cylinder. i have replaced the coil and spark plug. i can clear the code and the car goes back to running normal. do u have any suggestions to solve the problem?
Answered by Richard in 3 mins 13 years ago
imglogo
Richard
15+ years of experience
logo

19,890 satisfied customers

Specialities include: Automotive Mechanic, Small Engine Repairs, Auto Body Repairs, Diesel Engine Repairs

Hello and welcome to justanswer.com

 

Is the code P0300? With the new coil and plug can you still pinpoint it to cylinder 1?

Customer

p0301 p0174 p0300 p1316

Ok

 

It sounds like you have a vacuum leak. On the supercharged engines the bellows between the top plate and the ducts will leak which can cause the rough running and those codes. Try spraying around those bellows with carb cleaner to see if there is a chnage in engine rpm. Also look at the plastic breather hoses on both valve covers to make sure they are not leaking. As far as the valet there are two ways to get it out of valet. You can either open the trunk with a master key or use the remote.

Customer
the key will unlock the doors but not the trunk. when the button is pressed for thr trunk on dash it only gives me the valet mode signal

Ok

 

You will need a master (black) key for the trunk or use the fob remote to get out of valet mode.

Read less
unlike
0 Likes
logoBack
logologo
Richard
logo
logo
19,890 satisfied customers
logo
15+ years of experience
imglogo
Richard
+ years of experience
logo

19890 satisfied customers

Ellen

Ellen

Licensed mechanics

31,131 satisfied customers

Pearl avatar
Steve Pearl, Mechanic's Assistant
14 Mechanics are online right now.
Related Car Questions
I have 2012 Jaguar xj 5.0l have all cylinders misfired and
12.31.2022
img
Julio Quispe
Car Specialist
490 Satisfied Customers
Engine light is flashing, cruise not available is displayed
10.20.2022
img
Daniel Chaidez
Technician
6,307 Satisfied Customers
2004 Jaguar XJR, misfiring BANK1, 1 3 5 7. Idling and
6.30.2022
img
Chris(aka-Moose)
Jaguar Technician
152 Satisfied Customers
Changed both cats on my 2009 Jaguar XF throwing codes p0316,
12.9.2021
img
Chris(aka-Moose)
Jaguar Technician
152 Satisfied Customers
Misfires cal # 3. 90000. random from 2000 to 3000. X type
12.7.2020
img
BrianS121
Senior Technician
106 Satisfied Customers
How it works
logoAsk for help, 24/7
Ask for help, 24/7
Members enjoy round-the-clock access to 12,000+ verified Experts, including doctors, lawyers, tech support, mechanics, vets, home repair pros, more.
logoExpert will respond in minutes
Expert will respond in minutes
After you reach out, we match you with an Expert who specializes in your situation. Talk, text, chat, whichever you prefer.
logoSave time & money
Save time & money
No scheduling hassles, missing time from work, or expensive consults.
A JustAnswer membership can save you significant time and money each month.
Sarahesq and 87 other Automotive Mechanics are ready to help you.
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.
Last Updated: 12-20-22
Why you’ll love JustAnswer
JustAnswer is the best way to get expertise on-demand from doctors, lawyers, vets, mechanics and more. Since 2003, we’ve helped more than 9 million people in 196 countries and have an A+ rating with BBB and a 9.6/10 rating with TrustPilot.
Highly rated, verified Experts
We pride ourselves in our 8-step verification process including license and credential checks. Vetted by us and rated by customers, like you.
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.
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.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
Web sites like justanswer.com/legal ...leave nothing to chance.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
JustAnswer, Professional Services  General, San Francisco, CA
Google reviews
TrustPilot Reviews