XJ XJ8 / XJR ( X308 ) 1997 - 2003

Misfire on XJR

Thread Tools
 
Search this Thread
 
  #41  
Old 07-23-2012, 01:10 PM
dsnyder586's Avatar
Veteran Member
Join Date: Jun 2011
Location: Costa Mesa, CA
Posts: 2,134
Received 542 Likes on 423 Posts
Default

Any damage is already done, so take out the plugs and do a compression check- make sure to squirt oil in the cylinders first. Any "0" reading=bent valves.

Not the end of the world, but alot more work.
 
  #42  
Old 07-23-2012, 01:13 PM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default

Ok so here is the good news. We didn't skip any teeth. I went home at lunch today and she fired right up. No engine codes, but the RPM was high, @ 1200 RPM at idle. There was also a strong gas smell when idling.

Did I mention I replaced the coolant sensor? The temperature gage was not registering anything so I think the after market sensor I got isn't working, which would account for the rich mixture and the higher RPM.

Calling the dealer to get the part. I'll update you all later.

I really mean this when I say THANK YOU. Since there is very little information on this car except here, it is great know I can come here and get ideas and opinions and that I'm not the only one with problems.
 
  #43  
Old 07-23-2012, 01:14 PM
jondyak's Avatar
Junior Member
Join Date: Jun 2012
Location: Goodyear Arizona
Posts: 2
Likes: 0
Received 1 Like on 1 Post
Default

Take a look at the spark plug wells. They leak oil and cause the same issue with spark jumping to the oil
 
The following users liked this post:
pingj (07-23-2012)
  #44  
Old 07-23-2012, 03:14 PM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default

Originally Posted by jondyak
Take a look at the spark plug wells. They leak oil and cause the same issue with spark jumping to the oil
Thanks Jondyak - I'll look at that tonight as well. I did while I had it torn down replace all the seals on the valve covers including the spark plug dounuts. But who knows one or two may have been pinched.
 
  #45  
Old 07-23-2012, 08:00 PM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default She Lives

Thanks All.

Went to the dealer this afternoon and picked up a new temperature sending unit. Put it in, topped off the coolant and fired her up.

She purs like she did when we bought her 4 years ago.

Onto the next problem.

ABS/Traction problem - Could be dirty wheel sensor.

Loud rumble from the rear. I'm thinking hubs or bearings.
 
  #46  
Old 07-24-2012, 02:37 AM
steveinfrance's Avatar
Veteran Member
Join Date: Dec 2011
Location: Limousin, France
Posts: 6,278
Received 687 Likes on 590 Posts
Default

Well, I'm more than happy to be wrong.
The rattle may be a lower shock bush. There's a whole thread on it but you make the diagnosis by holding the bush while someone bounces the car - you can feel the clunk.
The idle will be all over the place for a while. You're supposed to do a 'drive cycle' so the car learns the mixture etc. but I get the general impression from other members that it will sort itself out anyway.
 
  #47  
Old 07-24-2012, 03:10 AM
plums's Avatar
Veteran Member
Join Date: Feb 2011
Location: on-the-edge
Posts: 9,733
Received 2,181 Likes on 1,621 Posts
Default

So what brand was the bum aftermarket coolant temperature sensor?
 
  #48  
Old 07-24-2012, 01:31 PM
Roy's Avatar
Roy
Roy is offline
Member
Join Date: Jul 2012
Location: Salem Or
Posts: 61
Received 0 Likes on 0 Posts
Default ford motor

I have been told the engines are lincoln motors but don't quote me.
 
  #49  
Old 07-24-2012, 06:25 PM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default

Originally Posted by steveinfrance
Well, I'm more than happy to be wrong.
The rattle may be a lower shock bush. There's a whole thread on it but you make the diagnosis by holding the bush while someone bounces the car - you can feel the clunk.
The idle will be all over the place for a while. You're supposed to do a 'drive cycle' so the car learns the mixture etc. but I get the general impression from other members that it will sort itself out anyway.
Thanks Steve, MEEEE TOOOO.

The rattle is really more a rumble like bad tires, but it isn't tire related. My buddy and I are going to put it up on jack stands tomorrow and spin the rear wheels. I'm really thinking bears, but fear it may be the differencial.

I have already checked the shocks there are fine.

The idle has already settled down, the car is running like a dream. It's starting fine and accelerates like it did when we first got it.
 
  #50  
Old 07-24-2012, 06:28 PM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default

Originally Posted by plums
So what brand was the bum aftermarket coolant temperature sensor?
It was a BDW 5053

I can't find the website I found the cross reference on but for the cost it just wasn't worth it. Dealer prince was $45 buck, even though it is a $15 part.
 
  #51  
Old 07-26-2012, 10:10 PM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default

Hey guys, So yesterday I put the rear end up on Jack stands, ran the engine about 1200 rpm. Listened to the differential and ther rear hubs.

There is a loud gear whiring noise from the differential. The sad part is there are no parts available to rebuild the differential that I can find.

So I've been searching the net and found one on eBay but it has more milage than my current one.

Before I jump the gun here and spend money I don't need to, how much play is there when you jack up the rear end and start turning one wheel, before the other wheel starts to move?
 
  #52  
Old 07-27-2012, 12:11 AM
dsnyder586's Avatar
Veteran Member
Join Date: Jun 2011
Location: Costa Mesa, CA
Posts: 2,134
Received 542 Likes on 423 Posts
Default

There is a vent on the top of the diff that sometimes gets clogged and makes the diff noisy (oil gets foamy?) clean it out and see if it helps. It takes a little ingenuity to remove the cap and clean it but its not hard.
 
  #53  
Old 07-27-2012, 01:18 AM
plums's Avatar
Veteran Member
Join Date: Feb 2011
Location: on-the-edge
Posts: 9,733
Received 2,181 Likes on 1,621 Posts
Default

If the vent is clogged, there should be signs of gear lube seepage out the seals somewhere at the pinion or side seals.

Don't forget to check and top up the gear lube. It is usually not a case of just clearing the vent ... the lube has already exited.
 
  #54  
Old 07-29-2012, 11:29 AM
pingj's Avatar
Senior Member
Thread Starter
Join Date: Mar 2009
Location: Coastal Georgia, USA
Posts: 142
Received 7 Likes on 5 Posts
Default

Thanks guys. I got the bearings ordered yesterday. I'll get under the car this week and check out the differential oil level and vent.

Just curious though, why would the plugged vent cause the oil to get foamy? A plugged vent would cause pressure increasing inside the case so I can understand the oil being forced out around the seals. The foaming comment has me stumped though.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Norri
S-Type / S type R Supercharged V8 ( X200 )
19
09-28-2015 08:43 AM
KarimPA
S-Type / S type R Supercharged V8 ( X200 )
8
09-27-2015 08:46 AM
BlacXJRcat
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
1
09-25-2015 06:43 PM
Dickie_L_J_O
XJ XJ8 / XJR ( X308 )
8
09-13-2015 07:44 AM
Bcrary3
XJ XJ8 / XJR ( X308 )
7
09-11-2015 10:36 AM

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


Quick Reply: Misfire on XJR



All times are GMT -5. The time now is 08:51 AM.