MJ Comanche Tech. Stock & Modified. MJ (86-92)
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2.5 idle issue

Old 12-03-2016, 06:34 PM
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Default 2.5 idle issue

Hi guys, I got my hands on a 1986 XLS 2.5 TBI 4x4. When i bought it didnt start, it needed a fuel pump. I got it started but when it first starts it'll idle real low and spuder then if I give it some gas it'll come to life but idle a little high. To be honest Im no expect with these TBI injected vechicles. Thank you
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Old 12-04-2016, 08:50 AM
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How are the plugs, wires, cap and rotor?

Check to see if you have a loose intake manifold.

Also check these hoses:
Attached Thumbnails 2.5 idle issue-4-cyl-tb-hoses.jpg  
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Old 12-04-2016, 06:57 PM
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ok Thank you for the reply. Ill check the manifold tomorrow after work. Plugs and wires could be changed i was planning on changing those tomorrow as well. But do these have any type of fuel regulator? And if so where is it?
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Old 12-04-2016, 10:09 PM
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Fuel pressure regulators are rarely, if ever, an issue.

What leads you to think that's a problem?
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Old 12-05-2016, 04:18 PM
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Originally Posted by cruiser54 View Post
Fuel pressure regulators are rarely, if ever, an issue.

What leads you to think that's a problem?
To be honest I'm just trying to cover the basics.
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Old 12-05-2016, 04:38 PM
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Originally Posted by cherokeexj21 View Post
To be honest I'm just trying to cover the basics.
Save that for later.
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Old 12-05-2016, 04:53 PM
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Originally Posted by cruiser54 View Post
Save that for later.
ok will do thank you
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Old 12-11-2016, 10:06 PM
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Originally Posted by cherokeexj21 View Post
ok Thank you for the reply. Ill check the manifold tomorrow after work. Plugs and wires could be changed i was planning on changing those tomorrow as well. But do these have any type of fuel regulator? And if so where is it?
The fuel pressure regulator is built into the TBI.
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Old 12-12-2016, 06:35 PM
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Originally Posted by Outlaw Star View Post
The fuel pressure regulator is built into the TBI.
Really? sounds like it could have pros and cons.
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Old 12-12-2016, 07:10 PM
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Originally Posted by cherokeexj21 View Post
Really? sounds like it could have pros and cons.
It's actually adjustable unlike the 4.0L one. "Thanks GM!" Lol
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Old 12-22-2016, 07:22 PM
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Cool

ok so update. I cleaned out the EGR valve and piping, cleaned out the throttle body (because it was disgusting) and put in a new O2 sensor (wires burnt) And VVROOM! good as new! Thanks for the replies.
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Old 12-22-2016, 10:49 PM
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Originally Posted by cherokeexj21 View Post
ok so update. I cleaned out the EGR valve and piping, cleaned out the throttle body (because it was disgusting) and put in a new O2 sensor (wires burnt) And VVROOM! good as new! Thanks for the replies.
Amazing. Good job.
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