Jump to content

Recommended Posts

I am the owner of a 1986 CJ7 I had everything rebuilt carburetor generator radiator blah blah blah put in a rebuilt motor I purchased. Wasn’t happy with carburetion so I added a Howell electronic feel ignition system . Now it runs great spontaneously it will start acting like it’s starving for fuel, check engine light coming on permanently or flashing at different times I can pretty much always do the speed limit and drive it but it will not always perform well

Link to post
Share on other sites
  • Administrators

Sounds like an effort to get better performance and reliability, Jsmes.  This is a well tested EFI  conversion. 

You have a fuel supply issue.  The Howell kit, fortunately, has a provision for getting a code from the ECM.  Bill Howell designed this system after a GM TBI setup, and it uses off-the-shelf OEM/stock replacement parts—presumably for the 4.3L TBI V-6 engines.   This makes the system more reliable, and you can find replacement parts in an emergency.

I would start by checking for stored trouble codes.  This is simple enough with an inexpensive code reader from Harbor Freight or a trip to your local AutoZone.  They will read codes for free.  

See what code has been thrown.  It sounds like a fuel supply or pump issue.  Check over the routing of your hoses, including the EVAP system.  See whether there is a vacuum issue.  Check the wiring for your EFI system, especially to the fuel pump.  If you used butt connectors for important wiring splices, this can be a source of trouble.  EFI is sensitive to voltage, and resistance or opens at connectors can produce erratic performance.  I always use rosin-core solder and double up on heat shrink tubing at these splices.

You can also check the fuel pressure and flow at the TBI end of the system.  A pressure gauge and Tee/hose to a steel can can measure the pressure and, equally important, the fuel volume or flow.  There could be a restriction of fuel flow, anything from a clogged pickup sock in the fuel tank to a bad fuel filter or kink in a hose or line.

If you have stored trouble codes, share them.  We can go from there.  This is a reliable system that can be dependable when operating properly.

Moses

Link to post
Share on other sites
  • Moses Ludel changed the title to Jeep CJ-7 4.2L/258 Howell TBI Conversion Trouble

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...