TBI Fuel Injector/ No start - JeepForum.com
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post #1 of 4 Old 03-19-2013, 07:08 PM Thread Starter
Registered User
1989 YJ Wrangler 
Join Date: Mar 2013
Location: Bowling Green
Posts: 262
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!

Fellows45 is offline  
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post #2 of 4 Old 03-20-2013, 07:55 AM
Web Wheeler
1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit
Posts: 24,647
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:

To download the fsm:

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!

Also lots of good info in Shaef's threads about his TBI:

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.
Que89YJ is offline  
post #3 of 4 Old 03-20-2013, 09:34 AM Thread Starter
Registered User
1989 YJ Wrangler 
Join Date: Mar 2013
Location: Bowling Green
Posts: 262
Thanks so much!
Looks like I know what I'll be doing this week with my days off from college!

Thanks again!
Fellows45 is offline  
post #4 of 4 Old 03-20-2013, 09:40 AM
Registered User
1991 YJ Wrangler 
Join Date: Mar 2012
Location: Niagara Falls
Posts: 1,876
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.

***--- Wrecking Crew member ---***
"I've prolly been around longer than you think"
pete1991YJ is offline  

fuel , fuel injection , fuel injector , start problems

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