Still frustrated - Can't pass 3400 rpm - Defender Source
Defender Source  

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


Reply
 
Thread Tools
  #1  
Old January 16th, 2007, 11:25 PM
ScottYates's Avatar
ScottYates
Status: Offline
Scott Yates
94 D90 #639, Yellow
Member
 
Join Date: Nov 2006
Location: Denver, Colorado
Posts: 165
Angry Still frustrated - Can't pass 3400 rpm

Hello all.

I am still fighting a complete power shut off at 3200-3400 rpm. I have tried the following without sucess:

Neutral check. - No effect, problem remains.
New NGK Plugs,
New MSD Distributer and coil - more power and smoother idle, no change in 3400 rpm fall off.
New fuel filter,
Verified base timing at 6* btdc.
I also checked all of the vacuum connections with brake clean and no leaks were found.
New Air cleaner.
I am idling at ~800rpm. This is at an altitude of 7260'.


The 3.9l is phenomenally stronger running now but still cuts out completely at 3400 rpm. I am running out of ideas at this point. It seems to have a lot of power at 3000 rpm but stumbles and will not surpass 3400 rpm under any circumstances.

Clogged cats would cause an over heating issue correct? I have no temp issues and the D only has 45k miles on it.

I have been unable to locate a fuel pressure gage that will fit the line at the filter so I don't see how I can check the pump. I replaced the fuel regulator with no obvious effect.

Any ideas? This is driving me crazy. It will not reach the speed limit on the interstate due to this, forget passing anything besides grandma on a cellphone.
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old January 17th, 2007, 08:13 AM
flippedrover's Avatar
flippedrover
Status: Offline
Tyler
'94 D-90
Member
 
Join Date: Dec 2003
Location: Ashburn,va
Posts: 3,125
ECU? Or was that checked in the other thread?
__________________
Can't you feel 'em circlin' (closin'in) honey?
Can't you feel 'em swimmin' around?
You got fins to the left, fins to the right,
and you're the only bait in town.
You got fins to the left, fins to the right,
and you're the only girl in town.

Jimmy Buffett


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 January 17th, 2007, 12:07 PM
Doug's Avatar
Doug
Status: Offline
Doug Walker
TVR5L-powered NAS D-110
Member
 
Join Date: Oct 2003
Location: Los Angeles, CA, USA
Posts: 880
Switch out ECU and test. Any 14cu or 14 cux will work for the test, out of any vehicle with a hot-wire efi system. If still stuck at 3400, start testing all the sensors -- water temp, fuel temp, road speed, etc. ANything that inputs to the ECU.

Doug W.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old January 17th, 2007, 12:37 PM
Tim Scully's Avatar
Tim Scully
Status: Offline
Tim Scully
95 D90 SW/ 95 RR LWB
Member
 
Join Date: Dec 2006
Location: Sacramento CA
Posts: 101
It could be the ECU but it seems like the engine is running out of air or fuel when you really ask for it to work. I would try to hook up a fuel pressure guage to see what you have there.

Maybe you could use a generic fuel press. guage and a hose with a clamp on the inlet side of the fuel filter. It won't be easy to make it seal but short of making a junction block like the dealers have you don't have much of a choice(unless you could borrow one from a dealer). I don't think there is enough room to get a hose on the fuel lines anywhere to get a good seal with a hose clamp to check it but you could try the connections at the inlet of the fuel filter and the union at the fuel rail to see if you could rig something up.

Tim
Reply With Quote
  #5  
Old January 17th, 2007, 02:02 PM
evilfij's Avatar
evilfij
Status: Offline
evilfij
I have never seen a rover in person
Member
 
Join Date: Oct 2003
Location: on the internet
Posts: 14,688
at this point in time it can really only be the ecu.

Ron
__________________
*not legal advice*
Reply With Quote
  #6  
Old January 17th, 2007, 09:16 PM
ScottYates's Avatar
ScottYates
Status: Offline
Scott Yates
94 D90 #639, Yellow
Member
 
Join Date: Nov 2006
Location: Denver, Colorado
Posts: 165
Thanks guys. I have been unable to locate a usable fuel pressure guage so I will start hunting for an ECU. This has become quite the expensive little gremlin to track down.
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
Does a 3.9 have a govenor at 3400 rpm? ScottYates Defender Technical Discussions 25 January 17th, 2007 10:45 AM
RPM Fluctuation Billakris Defender Technical Discussions 5 March 28th, 2005 10:52 PM
Engine sputtering chugging between 2650-3200 rpm Heath Defender Technical Discussions 14 February 8th, 2005 08:36 AM
The latest show-stopper: dies at idle, only runs above 2K rpm jaherring Defender Technical Discussions 34 December 23rd, 2004 07:05 PM
Need 10 Spline Pass. Side Front Axel... h2eater Wanted 3 August 14th, 2004 09:57 PM


All times are GMT -5. The time now is 12:16 PM.


Copyright