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Unread 03-19-2013, 08:08 PM   #1
Fellows45
Member
1989 YJ Wrangler 
 
Join Date: Mar 2013
Location: Bowling Green, Kentucky
Posts: 222
TBI Fuel Injector/ No start

Hey guys,
I'm new to the forum and hope to become a regular! I drive an 89 4 banger and am having some starting troubles. I have found that the seals on my TBI Injector are very worn, so much so that fuel seems to flow out of the top of the injector when I crank the engine.

My question is, even with worn seals and not very good injector flow, shouldn't the engine still turn over since its still getting fuel? How could I test to see if its a bad injector or just the seals?

Thanks again guys! and any other thoughts are much appreciated!

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Unread 03-20-2013, 08:55 AM   #2
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,656
Welcome to the forum.

No, the pressure is only 14 psi on the TBI. You should look at the rebuild kit with replacement injector for the throttlebody. This is in the Schaef thread below:

How to google the forum:
http://www.jeepforum.com/forum/f12/f...oogle-1003734/

To download the fsm:
http://dl.dropbox.com/u/40590346/87-88%20YJ%20Jeep%20Wrangler%20FSM%20manual.pdf
http://dl.dropbox.com/u/40590346/1990%20Jeep%20Factory%20Service%20Manual.pdf

If you download the FSM and you are not a member of dropbox, please PM Ninjakid and join under him. It gives him more space to store and it is a real generous thing to get the manual for free!
http://jeepspace.jeepforum.com/ninjakid

Also lots of good info in Shaef's threads about his TBI:
http://www.jeepforum.com/forum/f12/8...ocess-1293442/
http://www.jeepforum.com/forum/f12/2...-idle-1293410/


Get a multimeter. Some of the pre 91 tbi sensors require an adjustment to setup when replaced. Since you are dealing with PO that probably didn't know, chances are you need to do some adjustments with the basic tune up. Wide open throttle switch(WOT), the throttle position sensor(TPS), Idle Speed Adjustment Motor(ISA), and the fuel pressure on the throttle body.
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Unread 03-20-2013, 10:34 AM   #3
Fellows45
Member
1989 YJ Wrangler 
 
Join Date: Mar 2013
Location: Bowling Green, Kentucky
Posts: 222
Thanks so much!
Looks like I know what I'll be doing this week with my days off from college!

Thanks again!
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Unread 03-20-2013, 10:40 AM   #4
pete1991YJ
Registered User
1991 YJ Wrangler 
 
Join Date: Mar 2012
Location: Niagara Falls, NY
Posts: 1,659
Hi and welcome to JeepForum. You've just found one of the best jeep sites anywhere!

I can't add a lot here since mine is not TBI, but I wanted to say that Que and Schaef are the guys to listen to when it comes to that stuff.
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fuel , fuel injection , fuel injector , start problems

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