1987 Buick Lesabre High idle

NICK HENRY

MEMBER
1987 BUICK LESABRE
3.8L
V6
FWD
AUTOMATIC
120,000 MILES

My 1987 Buick LeS Custom has a newer engine now 25000 miles, all new sensors, newer computer and cold weather idles very high. It takes 10 min. To idle-down before it's safe to drive. It races too high when cold. Sometimes you have to kick the pedal to get it to shift out of lower range. Mechanics have determined vacuum is solid and poured over the wiring and scanned in great depth. The idle can be erratic at other warm climate. I've gone through more maf sensors and iac valves and tps sensors than ever. My grandparents had this car before me and with their old engine had the same troubles. Is this car "just the way it is"?

1 Reply

HMAC300

MECHANIC
48,601 POSTS

Maybe have a look at the iac and throttle plate of sticking try cleaning with choke cleaner. Also check for a vacuum leak if intake is plastic, car is to old I forget. Also check for duct work having holes in it as they shouldn't especially between maf and throttle body. If iac is replaced car must be driven 40 mph for it to set correctly after first adjustment.