Being it is a b2200 with a carburetor with the mentioned problems here is what to do.Remove the air cleaner housing and clean the carburetor and linkage and especially the choke mechanism.Use carburetor cleaner on the inside of the bowl and choke diaphragm area.I use brake cleaner on the outside of the carb to clean the cable because it will remove heavy build up and dry clean.Then use some liquid wrench and spray on the moving linikage and especially the choke and cable or even the graphite powder.What happens is the choke sticks in low idle or high with these carburetor and can cause the problem.I would recommend removing the egr valve as well and cleaning it being it provides better access with all the above removed and clean with either cleaner above and a brush and make sure you reinstall the gasket exactly as it was removed.It has three 10 mm bolts,one vacumm line,one electrical plug and can effect the trucks idle cold or hot.It is mounted below the carburetor on the right hand side at a angle and about a fist size.Idle would not be necessarily affected by plugs,wires,distributor cap or heat riser unless it has not been serviced in a long time in most cases or the parts are worn.Hope this helps,I have owned my b2200 for 23 years I know this truck pretty good on symptoms.
a lot depends on the engine??possibly a problem with the choke,or a solenoid if a diesel.
It may be in need of a good tune up.
1990 gmc p/u 5.7 wont idle showing code 12
your truck wont idle correctly when its cold, because its cold...and nothing runs correctly when it's cold. your truck wont idle correctly when its cold, because its cold...and nothing runs correctly when it's cold.
it depends on what kind of fule delivery system you have. if it is carborated then it could be because your idle screw is not set high enough and carb engines have to warm up befor they run good in cold weather. if it is carb, engine YOU MIGHT WANT TO ADJUST THE SCREW AND LET RUN FOR ABOUT 5 MIN IN THE COLD. IF IT IS A THROTAL BODY THAN IT COULD BE A HOLE IN ONE OF YOUR LINES AND WHEN IT IS COLD OUT IT WILL CAUSE IT TO ACT UP MORE NOTICABLY THAN IN WARM WEATHER.
Turn the Idle Adjusting screw.
Idle Air control (IAC) Bad Idle Air control (IAC) Bad
yes hot or cold it affects idle speed
check the idle air control valve
the cold idle is controlled by the PCM ( power train control module) the computer of the car and idle is not adjustable.
You need to go to www.rx7club.com, join and do a search. You will find all of the answers you need there.
to turn on the high idle you must run a wire to the ecm /www.kennedydiesel.com:.webloc if you go to this link it will give you the instructions to do it. I did it on my truck and it works great !!! if you have a car starter with an available output you can connect it through that and run you high idle from that.