Running into power/hesitation issues - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old November 24th, 2006, 09:09 PM
rvrchuck's Avatar
rvrchuck
Status: Offline
Chuck Hester
1995 D90
Member
 
Join Date: Dec 2003
Location: Maryland - USA
Posts: 165
Registry
Running into power/hesitation issues

Hey gang,

The last few times I've been out in the 90 cruising at highway speeds (or as fast as I can get the bread box to go down 95) for extended periods of time I have experienced substantial (but luckily brief) hesitation from the beast as if she's starved for fuel for a brief moment. This generally has only lasted a few seconds at best, but when cruising at highway speeds and having the sudden loss of power I start to worry.

I have checked the fuel filter and it does not appear to be clogged. Points checked and plug wires don't appear to be an issue. Rotor and cap seem fine. My next guess is the fuel pump...anything else I'm missing here guys/gals? Anyone else have this issue with the 3.9 liter?

Thanks!
__________________
Roverin' Chuck
'95 AA Yellow 90
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old November 24th, 2006, 09:52 PM
chris snell's Avatar
chris snell
Status: Offline
Chris Snell
87 Ex-MOD 110
Member
 
Join Date: Aug 2005
Location: Kansas
Posts: 2,439
I had the same problem. I replaced my plugs and plug wires and the problem went away. For good measure, run some 44K through it with your next tank of gas.

UPDATE: Oh, there was one other thing that may have been causing it. The wires going to the coil had some iffy-looking connections on it. I cleaned the contacts and re-crimped the ends with a pair of needle nose pliers. Be careful when doing this. You could get zapped. Also, the plug wire going from the distributor to the coil was especially sketchy-looking. Probably a good idea to replace that one when you do your plug wires.
__________________
1987 Ex-MOD 110 Tithonus LHD
2013 LR4


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
/
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
/
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
/
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
/
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #3  
Old November 25th, 2006, 10:17 PM
Billakris's Avatar
Billakris
Status: Offline
Kris
Alpine White 95 Soft Top
Member
 
Join Date: Sep 2003
Location: Kansas City/ Manhattan, KS
Posts: 271
Check and clean your MAF sensor.
__________________
Kris
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old November 26th, 2006, 04:43 PM
Bozman's Avatar
Bozman
Status: Offline
Greg
1991 200tdi D90
Member
 
Join Date: Dec 2005
Location: Manchester, Vermont
Posts: 1,571
Registry
I had a similar problem and it turned out to be the injectors. It was more of a consistent hesitation when the engine was under power though.
Reply With Quote
  #5  
Old November 26th, 2006, 07:59 PM
rvrchuck's Avatar
rvrchuck
Status: Offline
Chuck Hester
1995 D90
Member
 
Join Date: Dec 2003
Location: Maryland - USA
Posts: 165
Registry
Thanks, I'll give those a look...injectors last. MAF and plugs/wires are easier.
__________________
Roverin' Chuck
'95 AA Yellow 90
Reply With Quote
  #6  
Old November 27th, 2006, 01:06 AM
jimngo's Avatar
jimngo
Status: Offline
Jim Ngo
1994 D90 #80
Member
 
Join Date: Aug 2006
Location: Salt Lake City, UT
Posts: 118
Does your D90 have the ignition module relocation kit (STC1856) installed yet? On mine I did the following:

1. Replace fuel filter
2. Replace the main & fuel pump relays
3. Cleaned the MAF sensor and stepper motor
4. Install a Mallory distributor (in lieu of STC1856)
5. Reset base idle & timing

For me, my problem was probably either one of the relays or the ignition module.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Running Rich Please Help bstraw Defender Technical Discussions 23 October 26th, 2007 10:44 AM
Dash, Running & Head light PROBLEM ! Weldon Defender Technical Discussions 5 November 9th, 2005 02:04 PM
It's Running! Mike Hippert Misc. Chit-Chat 26 June 2nd, 2005 08:04 AM
Fuel Pump running PSI and deadhead PSI? RedRhinoProducts Defender Technical Discussions 0 February 27th, 2005 02:35 PM
DS Running light? Eric Siepmann Defender Technical Discussions 1 June 27th, 2004 07:55 PM


All times are GMT -5. The time now is 11:02 PM.


Copyright