Just got a 1989 yj lifted on 35's, love it so far just having a few problems to sort out..
ok so when im running:
sometimes stalls in reverse if you're not on the gas
hard start when the motor is hot, have to hold the gas all the way down for it to start
stalled at idle with the a/c on
seems to have a little bit of a rough idle, maybe idling too low?
that being said, I know alot of people aren't fans of the stock carbs on these. So does this sound like a carb/tuning problem that can be fixed easily?
also what carbs do yall recommend for an 89?
Another thing is my right window regulator is broken and the cheapest i've seen is like $80, anyone have a tip on a cheaper route?
Thanks for all the help and awesome info on the forum,
What RPM is it idling at? Did it sit up for a while before you got it? Does it have fresh gas?
Without knowing your specific vehicle, I'd check:
Rotor button thingy
Basically a tune up.
Check the condition of any vacuum lines, a bunch of my rubber elbows were dry rotted.
Fuel pump/pressure both cold and hot.
If all that checks out, I'd start thinking about a good clean/rebuild of the carb. Depending on your ability & costs for a shop to rebuild, you might come out better to replace it. I'd do the other stuff first, though. Typically I'll start with the cheapest possible fix & move up to the most expensive.
To really help, we need to know what's been modified on it already.
Stock, it has a pretty complicated computer controlled emissions setup that can cause lots of problems if it isn't all working correctly. See this for how it works stock. http://home.sprynet.com/~dale02/list.htm The factory service manual will tell you how to troubleshoot it.
Assuming your not suffering from a vacuum leak caused by the carb base or other major components, the idle and stall issue is not really that hard to track down "if" you have all the stock sensors and emission components still installed. All you need is a DMM and Vacuum gauge, and the pin outs to the diagnostic ports from the link provided previously.
There are some 'step by step' tasks to do that are in the FSM but they can be easily paraphrased if you don't have access to that.
A 4.2L auto w/ ac are different for it then a manual tranny would be, and the fast, hold and a/c on idle settings need to be set and have a multiple phase setting sequence that should be detailed on the sticker on your hood.