XJ40 ( XJ81 ) 1986 - 1994

'88 XJ40 Rough Idle After Tuneup

 
  #1  
Old 06-10-2017, 12:39 AM
Junior Member
Thread Starter
Join Date: Jun 2017
Location: aug
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default '88 XJ40 Rough Idle After Tuneup

Just got the same car, sitting since 09, so far FPR is the only thing that hasn't been regular maintenance. Still after tune up it will idle VERY ruff like it wants to stall but doesn't. Will drive just fine. Stinky smoke coming out the pipes. I'm going to do the o2 sensor and ICV this week. Any other suggestions?
 
  #2  
Old 06-10-2017, 12:55 AM
Veteran Member
Join Date: Sep 2012
Location: Victoria BC Canada
Posts: 1,870
Received 1,190 Likes on 744 Posts
Default

Clean out the intake plumbing and throttle body butterfly
 
The following users liked this post:
Don B (06-10-2017)
  #3  
Old 06-10-2017, 11:09 PM
Join Date: Feb 2014
Location: The Beautiful Mid-South, U.S.A.
Posts: 16,600
Received 7,673 Likes on 4,280 Posts
Default

Originally Posted by Anubis Osiris View Post
Just got the same car, sitting since 09, so far FPR is the only thing that hasn't been regular maintenance. Still after tune up it will idle VERY ruff like it wants to stall but doesn't. Will drive just fine. Stinky smoke coming out the pipes. I'm going to do the o2 sensor and ICV this week. Any other suggestions?
Hi Anubis,

Welcome to the Jaguar Forums! It's great to have you with us.

I have moved your posts to a new thread so we can focus on your specific issues (the other thread to which you posted had had no activity for years).

The first thing I would recommend is that you check the Vehicle Condition Monitor for any stored Diagnostic Trouble Codes (DTCs). To check, turn the key to Position II (Ignition On) but do not start the engine. Press and release the VCM button on the trip computer to the right of the steering wheel. Now watch for a message to appear in the small window below the speedometer where the odometer/mileage is usually displayed.

If any codes are stored, they will be in the form of "FF" or "Fuel Fault" followed by a number. Write down anything that is displayed and post it here so we can help.

One test of the FPR is to pull the vacuum hose, turn the key to position II or even crank the engine briefly, then check for signs of wet fuel at the FPR vacuum hose fitting. If you see any, the diaphragm has failed and raw fuel is being inhaled into the intake manifold and contributing to rich running.

You can test the O2 sensor's performance by back-probing its electrical connector.

There is a wealth of information, including factory service documentation, available from the 'HOW TO' quick links thread on the home page of this XJ40 forum, and at websites such as jagrepair.com.

You can remove the IACV, disconnect the stepper motor and clean all the carbon from the valve and the stepper motor pintle. I use a small wire brush on the pintle and a battery terminal brush in the ports of the valve body, along with a suitable solvent (whatever's handy, like brake cleaner or throttle body cleaner).

There are plenty of other possible causes of can you please tell us what was done in the tuneup?

Also, please visit the https://www.jaguarforums.com/forum/n...-intro-must-5/ and post a required introduction so we can learn something about you and your Jaguar and give you a proper welcome.

Cheers,

Don
 

Last edited by Don B; 06-10-2017 at 11:16 PM.
The following users liked this post:
93SB (06-18-2017)
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
innzane
X-Type ( X400 )
0
04-22-2017 04:30 PM
nonfinito
PRIVATE For Sale / Trade or Buy Classifieds
2
06-14-2016 12:34 PM
amcdonal86
XJ6 & XJ12 Series I, II & III
25
01-19-2012 10:03 PM
93greenconv
XJS ( X27 )
1
01-25-2011 10:58 PM
dijmand
S-Type / S type R Supercharged V8 ( X200 )
10
10-12-2009 09:09 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: '88 XJ40 Rough Idle After Tuneup


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: