chaseincats Posted April 1, 2023 Author Share #13 Posted April 1, 2023 I've been trying to tune the car with an air fuel gauge for a while now. A few years ago my car held a steady temp and I got it to run perfect/consistent numbers but now that it heats up a bit in traffic and cools down on the highway those numbers are no longer so steady. I was looking into adding the temp resistor to keep the temp gauge in check but it looks like I misunderstood the premise as I thought it limited the resistance to 300 ohms (175 degrees) but instead it just adds resistance overall. So me adding it will put me in the same place I currently am, just with a richer running engine it seems... Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652022 Share on other sites More sharing options...
siteunseen Posted April 1, 2023 Share #14 Posted April 1, 2023 My '77 ran horribly up until about 2,500 RPM. I jerked and bucked between running good and bad, popped through the throttle blade too but above that certain RPM range it ran great. I read and read until I was overwhelmed by possibilities of what it could be. I decided to take a chance and went to Radio Shack and got the volume knob for a stereo. $5 dollars and some speaker wire I have plenty of now I have the potentiometer in the passenger's floor board so I can fine tune while driving. From what I gathered in all that reading was the ECU would get out of spec over time and the pot addition brought it back to life. It worked great for me and now I have a new something to distract me while driving. Page 3 is the good stuff out of the whole thread... 3 1 Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652027 Share on other sites More sharing options...
Jeff G 78 Posted April 2, 2023 Share #15 Posted April 2, 2023 Mine has had a potentiometer for 20 years or so. I was organizing the garage today and I came across a hard copy of the instructions on how to install and tune it. I am pretty sure I printed it on a dot matrix printer. 🙂 Mine sits right on top of the intake and I haven't had to adjust it since first dialing it in. 1 Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652054 Share on other sites More sharing options...
chaseincats Posted April 2, 2023 Author Share #16 Posted April 2, 2023 4 minutes ago, Jeff G 78 said: Mine has had a potentiometer for 20 years or so. I was organizing the garage today and I came across a hard copy of the instructions on how to install and tune it. I am pretty sure I printed it on a dot matrix printer. 🙂 Mine sits right on top of the intake and I haven't had to adjust it since first dialing it in. Could you take a couple pictures of the installation instructions? Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652055 Share on other sites More sharing options...
siteunseen Posted April 2, 2023 Share #17 Posted April 2, 2023 Here's what I went by. It's really easy and even easier to remove if it doesn't help. http://atlanticz.ca/zclub/techtips/tempsensorpot/index.html 1 Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652067 Share on other sites More sharing options...
chaseincats Posted April 2, 2023 Author Share #18 Posted April 2, 2023 This can only be used to richen the mixture not lean it out though since it’s adding resistance to the temp sensor, correct? Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652080 Share on other sites More sharing options...
siteunseen Posted April 2, 2023 Share #19 Posted April 2, 2023 If it's already lean as mine was just consider without the pot switch you're at -10????? whatever. So I add the potentiometer and can make it 0 or dial it all the way back and lean it out to -10. Go full the other way and I can fatten it up so much it barely idles. So to quote some politician it's all relative to what it is today as to what it can be tomorrow. 1 Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652083 Share on other sites More sharing options...
siteunseen Posted April 2, 2023 Share #20 Posted April 2, 2023 Trying to make sense of the dial up more fuel thinking. Mine is about half way between 0 and 10 on the volume knob. That's back to normal running on my 280. Resistance is trying to cut my dog's toenails. 1 2 Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652086 Share on other sites More sharing options...
chaseincats Posted April 2, 2023 Author Share #21 Posted April 2, 2023 Why is this better than messing with the afm out of curiosity? Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652087 Share on other sites More sharing options...
SteveJ Posted April 2, 2023 Share #22 Posted April 2, 2023 18 minutes ago, chaseincats said: Why is this better than messing with the afm out of curiosity? It's easy to f#@k up an AFM. 1 2 Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652088 Share on other sites More sharing options...
siteunseen Posted April 2, 2023 Share #23 Posted April 2, 2023 You beat me to the answer Steve. Much easier to try the volume knob. Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652089 Share on other sites More sharing options...
Yarb Posted April 2, 2023 Share #24 Posted April 2, 2023 Better to try an unmolested AFM than mess with the current one. Link to comment https://www.classiczcars.com/topic/68237-temp-sensor-resistor/?page=2#findComment-652091 Share on other sites More sharing options...
motorman7
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now