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1989 XJ Throttle issues on startup.

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Old 06-17-2017, 06:27 PM   #1
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Default 1989 XJ Throttle issues on startup.

Hello, I'm new here and I had purchased a Jeep about 6 months ago from my mom, been putting some work into it since then but I've been having one major issue that has been bugging me.

Whenever I start it, it takes a while to crank (If it hasn't been run in a few hours) then it will idle fine for 15 seconds or so, then the motor will bog down to a sputter, then rev back up and repeat this process 2 to 4 times, sometimes stalling.

Once I start driving, the same issue occurs when I attempt to give it throttle, it will bog down to the point of almost stalling (Sometimes stalling) then rev right up.

This all goes away after driving it for about 1/4 mile, after that it throttles fine and runs great.

Any help you guys could give me would be greatly appreciated!
Here are some notes

- There is a fuel smell when it revs up after almost dying out
- I"ve already replaced several parts on this jeep, I did all new Vacuum lines,(Old ones particularly after the intake were nasty and broken) new harmonic balancer, new plugs, wire, cap and rotor.
Supposedly the IAC is only 2 years old as well.

The problem existed before changing all these parts and is still persisting, it seems to be getting worse at a very slow rate.

I will try to get a video of it and post it here later on.
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Old 06-18-2017, 07:16 PM   #2
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Welcome.

We will get this figured out.

To begin with, go to www.cruiser54.com and perform Tips 1,3,4, and 5.

Make sure your intake manifold fasteners are snug.

Inspect the tube from the throttle body to MAP sensor closely.
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Old 06-18-2017, 11:37 PM   #3
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Thank you for the reply! Hopefully tomorrows weather holds out and I can get going on those tips, for now here is a video of it happening on a cold start

https://www.youtube.com/watch?v=A1VT...ature=youtu.be

Note that the vehicle is doing everything on it's own after it is started, I gave it no throttle in this video.
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Old 06-19-2017, 08:21 AM   #4
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Quote:
Originally Posted by typh3621 View Post
Thank you for the reply! Hopefully tomorrows weather holds out and I can get going on those tips, for now here is a video of it happening on a cold start

https://www.youtube.com/watch?v=A1VT...ature=youtu.be

Note that the vehicle is doing everything on it's own after it is started, I gave it no throttle in this video.
Get on the other initial Tips, but do Tip 11 in the meantime.
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Old 06-19-2017, 07:04 PM   #5
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Weather didn't hold out for me to finish all of them (No garage, thunderstorms) however I did finish 11 first, and the IAC and throttle body were surprisingly clean. I got about halfway done with 3 and I cleaned the ground for 1.
Do you have any suggestions as to how to get in there for number 1 to remove it? There isn't alot of breathing room and the bracket that holds the dipstick tube is really in the way, can I just remove that temporarily or no?

Also, the ground stud for number 1 was so gunked with stuff I couldn't even find it at first... Several of my gaskets are bad too so the motor is quite dirty.
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Old 06-19-2017, 07:09 PM   #6
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At the dipstick tube stud, hold the stud still while using a 1/2" wrench to remove the nut.
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Old 06-20-2017, 01:52 PM   #7
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My 1987 does that also, it's worse if it sets for a couple of weeks. I have a wide band air fuel ratio guage on mine and what I've seen is that the engine control will mess around with the fuel mixture. It will start and then will start to lean the mixture all the way to the point of no fuel (stalls sometimes) and then start to add fuel to the point off full rich. I can watch the gauge sweep from lean to rich if I do not touch the throttle. To me it seems to be learning. I don't know if some modifications I have done to the ignition system cause it or because my engine control is getting its reference from the 5 volt wire on the wide band O2 sensor.
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Old 06-20-2017, 09:06 PM   #8
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Almost done with all the tips, I did 11, 4, and am almost done with 3 and 1, 5 is on the list too.
All I have to say is wow, these things are far more helpful than I thought!

The light connector on the drivers side was just as bad as the photo on your site, and I'm eager to see how it reacts tomorrow on a cold start.

The only thing I have left on 3 is the connectors near the coil from a line that goes directly from the positive battery terminal, I'm not sure what it is (It's in the relay center) but those connectors are in very very bad shape... So I will probably get that done in the next few days and finish up the grounds.




The coil had some corrosion on it so I cleaned it up real nice...
Here's what it looked like
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Old 06-20-2017, 11:03 PM   #9
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Yikes!! You are the poster child for what needs to be done and how to get after it!!!!
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Old 06-21-2017, 11:20 AM   #10
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Im curious though, that highly corroded prong in the center, what exactly is that for? There isn't anything that attaches to it, is it supposed to be that way? I clearly saw where the other two round prongs go but the flat one just kind of sits in the open with nothing attached to it.
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Old 06-21-2017, 02:09 PM   #11
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Quote:
Originally Posted by typh3621 View Post
Im curious though, that highly corroded prong in the center, what exactly is that for? There isn't anything that attaches to it, is it supposed to be that way? I clearly saw where the other two round prongs go but the flat one just kind of sits in the open with nothing attached to it.
I believe that Renix ICM/Coil was used in multiple applications worldwide.
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