weird temp sensor problem
#1
weird temp sensor problem
I have a weird temperature sensor. I ordered the 3-wire sensor from a '98 F body, and got the STANDARD brand. All wired in, now when im idling for like 10-15 mins, temperature reading starts rapidly going up, highest i've seen so far is 254 and holding. With my laser temp gun, sensor body and the head are at 200deg, is this just a bad sensor? car doesnt boil over or overheat, both fans kick on since computer thinks its that hot...
#5
how do you have it wired up and what type of gauge are you running?? the Dark Green wire (ckt 135) should go to the gauge, the brown wire (ground) goes to PIN#25 in the blue PCM connector and the yellow goes to PIN#49 in the blue PCM connector.
#6
btw, I just looked at the pcm pinouts, and its pin#74 for yellow wire, and #80 for brown ground wire?
Last edited by 12SEC SS; 11-11-2007 at 07:04 PM.
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#10
You mean after I changed to the new sensor? I never ran it with the old factory sensor, so I dont know what that read...The only thing I can think of is ordering an ACDelco sensor...My steam pipe goes into the upper radiator hose, I installed a Moroso filler neck in the upper hose, and tapped it for a fitting for the steam pipe.
#11
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This is the only thing I can think of. Get the engine up to temp and measure the resistance between the ground wire and the wire going to the PCM. Then get the temp with your laser gauge. The last partis the hard part. You need to get someone with a Helms manual to check and see what the resistance should be for the given temp. This will tell you if the sensor is bad. I'd use mine but I just sold them on Ebay.
You could also get a mechanical gauge and run the sensor head into the upper radiator hose and clamp the hose around the metal sensor lead. It's a crude way to get a temp reading.
Re'
You could also get a mechanical gauge and run the sensor head into the upper radiator hose and clamp the hose around the metal sensor lead. It's a crude way to get a temp reading.
Re'
#12
Temperature vs Resistance Values (Approximate)
302 °F
47 ohms
284 °F
60 ohms
266 °F
77 ohms
248 °F
100 ohms
230 °F
132 ohms
212 °F
177 ohms
194 °F
241 ohms
176 °F
332 ohms
158 °F
467 ohms
140 °F
667 ohms
122 °F
973 ohms
113 °F
1188 ohms
104 °F
1459 ohms
95 °F
1802 ohms
86 °F
2238 ohms
77 °F
2796 ohms
68 °F
3520 ohms
59 °F
4450 ohms
50 °F
5670 ohms
41 °F
7280 ohms
32 °F
9420 ohms
23 °F
12300 ohms
14 °F
16180 ohms
5 °F
21450 ohms
-4 °F
28680 ohms
-22 °F
52700 ohms
-40 °F
100700 ohms
302 °F
47 ohms
284 °F
60 ohms
266 °F
77 ohms
248 °F
100 ohms
230 °F
132 ohms
212 °F
177 ohms
194 °F
241 ohms
176 °F
332 ohms
158 °F
467 ohms
140 °F
667 ohms
122 °F
973 ohms
113 °F
1188 ohms
104 °F
1459 ohms
95 °F
1802 ohms
86 °F
2238 ohms
77 °F
2796 ohms
68 °F
3520 ohms
59 °F
4450 ohms
50 °F
5670 ohms
41 °F
7280 ohms
32 °F
9420 ohms
23 °F
12300 ohms
14 °F
16180 ohms
5 °F
21450 ohms
-4 °F
28680 ohms
-22 °F
52700 ohms
-40 °F
100700 ohms