1990 Ford Aerostar Temp Sensor for mixture

1990 FORD AEROSTAR
100,000 MILES • 6 CYL • 2WD • MANUAL
Avatar
MOPARMANNIE
  • MEMBER
  • 1 POST
I have a 1990 ford Aerostar that just failed the emissons test. I gave it a tune up right before the test. after the test I checked the compression which is about 120 PSI in all cilynders. also checked the vacume which is in the green and stays very stedy. The cat also seems to be flowing free and working properly. But recently the water temprature guage in the dash quit working, so I replaced it with an after market guage and sensor. this means that the factory sensor and wire are no longer being used.
My question is: do you know if having a disconnected factory water temp sensor is tricking the computer into thinking that the engine is cold, and therefore causing a rich mixtrue?
Mar 21, 2009 at 9:50 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
My question is: do you know if having a disconnected factory water temp sensor is tricking the computer into thinking that the engine is cold, and therefore causing a rich mixtrue?

Test the CTS hot and cold if its out of range replace it-If the CTS resistance remains high it will enrich the fuel and vice versus
Mar 21, 2009 at 10:12 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.