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Old 11-12-2005, 09:49 AM   #1 (permalink)
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Question electronic problems HELP!!!

I have a 95 blazer, 4.3, auto, 4wd. runs fine up to half throttle, then hesitates and bogs down. I replaced to throttle position sensor and noticed something stange--when I measure the resistance directly at the sensor, it ranges from 1.8 at idle up 6.8 at wot, I believe that is an acceptable range. However, when measured through the pigtail, idle is roughly the same, but it tops out around 2.8 (coincidentally at about half throttle). Is this right?, if not how do I go about fixing this problem?
Thanks-- Nick
F.Y.I.-Nearly all ignition components are new as well as the fuel pump and filter.
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Old 11-13-2005, 02:35 PM   #2 (permalink)
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You should be measuring voltage, not resistance. You should have 5v into the sensor, and approx .5v out at idle, approx 4.3-4.8 at WOT. You can measure this KOEO. If you have more than this into and out of the sensor you will need to determine if the pcm has a bad buffer ckt internally or if the
5v reference is being shorted to voltage somewhere. Good luck DB
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Old 11-13-2005, 03:43 PM   #3 (permalink)
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I agree with dsbanhen, you need to check voltage, you cant measure resistance on a powered up circuit. Is this tbi or mpi? they had both in 95.
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Old 11-14-2005, 07:25 AM   #4 (permalink)
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How about fuel pressure? Catalytic converter partially plugged? Ck Engine light on? Ck engine light not working? My.02.Hope it helps
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