MPS testing/adjustment problem. Can't get anything higher than 0.9 H |
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MPS testing/adjustment problem. Can't get anything higher than 0.9 H |
scottthephotog |
Jun 16 2020, 05:59 PM
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#1
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Member Group: Members Posts: 187 Joined: 20-November 18 From: Euless, TX Member No.: 22,667 Region Association: Southwest Region |
I've been following this explanation and walkthrough of testing the MPS; https://members.rennlist.com/pbanders/manif...sure_sensor.htm, and I've come across a problem.
My MPS holds vacuum, I've got correct resistance readings on each of the coils, confirmed that they were isolated properly, so I moved on to adjusting. At 15 in. Hg, reading were correct (.71H). I found that I couldn't get the MPS to reach any higher than 0.9 H with my inductance meter at either the 4 in Hg or 0 in. Hg. I pulled the MPS apart, and measured again with it open (nothing pushing back on the main armature shaft with the armature shaft stops in place). The armature stops don't appear to be bent. With the armature shaft pushed in all the way, I get a reading of 0.45 H. Any thoughts? Is this MPS toast? I can't figure out why it won't register more than 0.9 H, which i way off from 1.44 H. |
scottthephotog |
Jun 17 2020, 10:44 PM
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#2
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Member Group: Members Posts: 187 Joined: 20-November 18 From: Euless, TX Member No.: 22,667 Region Association: Southwest Region |
Yes. All the correct parts for the 73' 2.0 (ECU, MPS, head temp sender, and ballast resistor. The quick calibration I did last night seemed to be a huge step in the right direction. Head temps reduced by 40-50 degrees (I've got a Dakota Digital cylinder head temp gauge installed). Now the temps are in the high 200s to low 300s for around town driving, and around 350 on the interstate. I've still got some more adjusting to do, but I'm really happy. Much better than before. I had been around 360 driving around town. Didn't even try to drive on the interstate.
Thank you for the AFR numbers! That will be a huge help when I hook the meter up to it for fine tuning. |
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