Home 
Home Search search Menu menu Not logged in - Login | Register

 Moderated by: Greg Fletcher
New Topic Reply Printer Friendly
engine sputters  Rate Topic 
AuthorPost
 Posted: 07-27-2005 05:34 pm
  PM Quote Reply
1st Post
Brad Pace
Member
 

Joined: 07-26-2005
Location:  
Posts: 4
Status: 
Offline
I have a mystery problem with my JH-5.  It starts up fine and initially runs good, but once it warms up (after 15 minutes or so) it begins missing, backfiring, and generally sputtering.  The more you drive it the worse it gets.  I have tried a number of things to diagnose this problem, all unsuccessfully.  I thought that the shims may be needing replacement or correction.  So I did this, which was a lot of work.  I then suspected that I might not be getting good compression, but I have tested this and the compression is fine.  My latest thought is that perhaps the choke is sticking and the fuel mixture is too rich, so as the engine warms it cannot handle the rich fuel.  But I do not smell a rich mixture and do not notice any unusual exhaust.  Last fall I put on new Dellorto's and perhaps there is a problem with these.  Has anyone else had problems like this (with the choke or carbs)?  Any suggestions?  Thanks!

Back To Top PM Quote Reply  

 Posted: 07-27-2005 09:27 pm
  PM Quote Reply
2nd Post
Mark Rosenbaum
Member


Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
Status: 
Offline
Might be fuel starvation.  Measure the fuel pressure at the inlet to each carb.  Pressure should be 1.5 to 3.5 psi.  IIRC, Del'lortos prefer 2.0 to 2.5 psi.

 

Back To Top PM Quote Reply

 Posted: 07-27-2005 10:18 pm
  PM Quote Reply
3rd Post
Dan Collier
Member


Joined: 03-17-2005
Location: Placentia, California USA
Posts: 36
Status: 
Offline
I once tracked the problem to the ground wire inside the distributor. The braided cloth sleeve can hide a broken wire. The engine would could idle normal and sputter under load. Just a thought.


Dan Collier
JH74 14381 2.2L
Jensen-Healey Preservation
Photo Gallery


 

Back To Top PM Quote Reply  

 Posted: 07-28-2005 01:51 pm
  PM Quote Reply
4th Post
Brad Pace
Member
 

Joined: 07-26-2005
Location:  
Posts: 4
Status: 
Offline
thanks, I will check it out

Back To Top PM Quote Reply

 Posted: 07-28-2005 01:52 pm
  PM Quote Reply
5th Post
Brad Pace
Member
 

Joined: 07-26-2005
Location:  
Posts: 4
Status: 
Offline
Yes, that wire is on my list of suspects.  It looks very questionable.  Thanks for the reply

Back To Top PM Quote Reply  

 Posted: 07-28-2005 03:08 pm
  PM Quote Reply
6th Post
Rory Clark
Member
 

Joined: 03-13-2005
Location: Okla. City, Oklahoma USA
Posts: 40
Status: 
Offline
The task to replace the distriburor wire is very simple (IF you pull the distributor) Just use a solid copper 14-18 ga. wire. Can't understand why they cloth covered it.  As it worked out I had some Hi-heat resistant covered wire. But I do not think the wire needed to be sheilded.

Rory 73-JH

Back To Top PM Quote Reply

 Posted: 07-28-2005 06:06 pm
  PM Quote Reply
7th Post
Brad Pace
Member
 

Joined: 07-26-2005
Location:  
Posts: 4
Status: 
Offline
thank you

Back To Top PM Quote Reply  

Current time is 08:59 pm  
> Jensen Healey & Jensen GT Tech > Engine & Transmission > engine sputters Top




UltraBB 1.172 Copyright © 2007-2011 Data 1 Systems