Forums
New posts
Search forums
Image search
Shop
Amazon Store
T-Shirts
Stickers
Members
Current visitors
Supporting Member Upgrade
Sponsors
About
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Image search
Search
Search titles only
By:
Search titles only
By:
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Jeep Wrangler YJ
YJ General Discussion
199 YJ 6 4.0 died (sometimes starts and sometimes doesn't)
Reply to thread
Message
<blockquote data-quote="RJones" data-source="post: 434885" data-attributes="member: 20152"><p>UPDATE: Likely still not fixed, but I was getting odd readings on the TPS when I test it. Range is suppose to be .2V - below 5 volts. I first read 5 volts right off with throttle closed and that's the low end. Way to high and means it's bad! However, I think maybe I did not have a good connection with the paper clip I used to back probe the wire to check it. Readjusted that and got .7 volts and opened throttle all the way up and got only 2.95 volts. Thinking that was low, decided to replace TPS. Keep in mind, after probing wired on harness, jeep fired right up, with old TPS. Also, fired right up today before I replaced TPS. I thought, maybe power wire inside harness wasn't making good connection? But doesn't really change anything when I wiggle it. Anyways, replaced TPS and it also fired right up. Readings on it were a little higher but not a lot. .8v (throttle closed) - 3.25v (throttle fully open). </p><p></p><p>After replacing TPS, Jeep started up 3 or 4 times no problem. Let it set for about 30 minutes and it started, but was slow to start. So I really don't know. </p><p></p><p>Almost does seem like it is something with the throttle. IAC (Idle Air Control) valve) maybe? Idles just fine though, around 800 RPM's and not rough or anything once it starts. </p><p></p><p>Someone on another forum mentioned neutral safety switch possibly an issue. Anyone familiar with it? I know it's only on the automatic jeeps, which is what mine is. Manuals don't have it. Thanks</p></blockquote><p></p>
[QUOTE="RJones, post: 434885, member: 20152"] UPDATE: Likely still not fixed, but I was getting odd readings on the TPS when I test it. Range is suppose to be .2V - below 5 volts. I first read 5 volts right off with throttle closed and that's the low end. Way to high and means it's bad! However, I think maybe I did not have a good connection with the paper clip I used to back probe the wire to check it. Readjusted that and got .7 volts and opened throttle all the way up and got only 2.95 volts. Thinking that was low, decided to replace TPS. Keep in mind, after probing wired on harness, jeep fired right up, with old TPS. Also, fired right up today before I replaced TPS. I thought, maybe power wire inside harness wasn't making good connection? But doesn't really change anything when I wiggle it. Anyways, replaced TPS and it also fired right up. Readings on it were a little higher but not a lot. .8v (throttle closed) - 3.25v (throttle fully open). After replacing TPS, Jeep started up 3 or 4 times no problem. Let it set for about 30 minutes and it started, but was slow to start. So I really don't know. Almost does seem like it is something with the throttle. IAC (Idle Air Control) valve) maybe? Idles just fine though, around 800 RPM's and not rough or anything once it starts. Someone on another forum mentioned neutral safety switch possibly an issue. Anyone familiar with it? I know it's only on the automatic jeeps, which is what mine is. Manuals don't have it. Thanks [/QUOTE]
Verification
Post reply
Forums
Jeep Wrangler YJ
YJ General Discussion
199 YJ 6 4.0 died (sometimes starts and sometimes doesn't)
Top
Bottom