I have an '85 with an Olds V8 5L, 4-barrel, automatic, 260,000 miles.
It often sits for two to five days between uses.
A couple of weeks ago, it started running really rough until the
engine warmed up.
This was a sudden problem, not something that progressively got worse
-- one day it ran fine, the next (well, the next time I drove it), it
My first thought was that the choke was sticking, so I got a can of
cleaner and sprayed down the carb and all linkages and made sure
everything was working fine.
That didn't help.
Further investigation shows that the choke is working fine.
The engine is running very rough and stalling until the choke kicks
off. Once the choke plate opens, she settles down and runs fine
(except for an occassional hesitation at stop signs, which it never
had before, either).
If I manually kick the choke off and start the car, she's a little
weak until she warms up a bit, but then goes strong.
When I checked the vacuum, it was about 12 (very, very weak) until the
choke kicked off, at which time it settled down to a nice strong 22.
I can't check the timing when it is cold, but when she's warmed up
(and the choke is off), it's right on spec.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.