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Jeep Wrangler YJ
YJ General Discussion
TPS setting
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<blockquote data-quote="Eric Haberli" data-source="post: 439495" data-attributes="member: 21062"><p>Hi Dorf, the 1990 YJ doesn't have CE light.</p><p></p><p>I think I now I can move on from the TPS and the idle speed actuator (ISA).</p><p>When I started working on this project 2 years ago, I did a major tune up on the engine because it sat in a car port for 7 years. I bought it from the original owner.</p><p>Changing all the sensors I thought I had covered all the testing and set up. What I didn't do was look into the ISA and the TPS and how they have to work together.</p><p>Today I went back to the ISA to make double share it was set up as designed. When it was disconnected the ISA took the RPM to 3500 RPM, and the plunger went to full extension, I then connected the reconnected the ISA and with the engine running the plunger retracted all the way in so that checked out. To make sure the throttle was completely closed I I then remove the ISA from the bracket. </p><p>Now I could check the TPS voltages. Input was 5.12V out put was 2.2V which didn't make any sense but never have removed the ISA I'm sure the reading was the problem. Acording the information that I could find, in a perfect world with 5V into terminal C the perfect reading coming out of terminal A should be 0.930. What I did is take the 5.12V input reading and mulitplied by .17 which gave me 0.8704. I set the TPS at close throttle at O.8704. I then put it all back together. All systems seem to come in, Idle was at 810 RPM and great throttle response for a four cylinder. As you mentioned then 1990 2.5 L YJ is a bit of a Rube Goldberg.</p><p>I ordered a new Mopar 1990 service manual RED cover from BJ's Full size Jeep Parts. I'm retiring the Chilton!</p></blockquote><p></p>
[QUOTE="Eric Haberli, post: 439495, member: 21062"] Hi Dorf, the 1990 YJ doesn't have CE light. I think I now I can move on from the TPS and the idle speed actuator (ISA). When I started working on this project 2 years ago, I did a major tune up on the engine because it sat in a car port for 7 years. I bought it from the original owner. Changing all the sensors I thought I had covered all the testing and set up. What I didn't do was look into the ISA and the TPS and how they have to work together. Today I went back to the ISA to make double share it was set up as designed. When it was disconnected the ISA took the RPM to 3500 RPM, and the plunger went to full extension, I then connected the reconnected the ISA and with the engine running the plunger retracted all the way in so that checked out. To make sure the throttle was completely closed I I then remove the ISA from the bracket. Now I could check the TPS voltages. Input was 5.12V out put was 2.2V which didn't make any sense but never have removed the ISA I'm sure the reading was the problem. Acording the information that I could find, in a perfect world with 5V into terminal C the perfect reading coming out of terminal A should be 0.930. What I did is take the 5.12V input reading and mulitplied by .17 which gave me 0.8704. I set the TPS at close throttle at O.8704. I then put it all back together. All systems seem to come in, Idle was at 810 RPM and great throttle response for a four cylinder. As you mentioned then 1990 2.5 L YJ is a bit of a Rube Goldberg. I ordered a new Mopar 1990 service manual RED cover from BJ's Full size Jeep Parts. I'm retiring the Chilton! [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
TPS setting
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