You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
maf sensor,o2 sensors,and yes a vacuum leak could cause it to run rich
__________________
91 mustang 5.0 lx,306 shortblock,E-303 cam,ported and polished E7's,rebuilt stock T-5,bbk E/L shorty headers,with their 2 1/2" o/r H-pipes,70 mm maf,3G alt.,upr adj. upper c/a's 3:73 gears. race weight with driver:3260,only a 100 lbs. more than the 85
85 mustang: parts car for now
Best time 13.7@ 102 mph 2.074 60' on street tires(in the '85)
Best time 14.3@ 96 mph 2.13 60' on street tires(in the '91)
how can you tell if a tps is bad my car idles around 500rpm and runs rich if i adjust the tps it really doesnt do anything just surges bad and goes back to 500rpm
If you put a digital voltage meter on the sensor (green and ground, I think) and see non-linear progression as you open the throttle with the ignition on (engine off). Also a really bad sensor like mine was will cause surging even at light throttle conditions and horribly rich (black smoke). I went thru a half tank of gas to drive 20 miles.
mustangsneverdie covered what you need to check, unless you have a SD stang, not MAF, depending on your year.
O2 sensors can be checked with a DVOM. Your going to be checking the millivolts from 0.2 to 0.8 and seeing how quick it switches. If the o2 sensor has a constant low voltage, that will increase the pulse width of the injectors.
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Idle problems and running rich
