I have a 92 k2500 with a 350 it starts up idles high but runs rough then dies. You can start it back up a couple times then on the 3 or 4th time it will be hard to start but when it does it black smokes like it's over fueling. Then clears out after giving it gas to keep it running. PO put on new cap rotor wires and plugs. Im sure its a sensor but plan on pulling the plugs seeing if there are gapped right maybe put ac delco plugs or ngk. I need to see if there are any codes. Any suggestions on what it could be, IAC, map or EGR maybe.
Not sure if this helps but it has gibson shorty headers with o2 in driver side header tbi spacer snorkel to inner fender for cooler air and suppose to have a custom burn chip. Is there a way to tell if the chip is bad.
Well the scanner doesn't do odb1. Ive unpluged everything one at a time. O2 sensor, ect, map, IAC, TPS, and nothing changed the way it was running. I went to the garage to get a can of brake clean to check fir vacuum leaks I came back truck was idling high and had a much louder air suction noise coming from the TB. I cut the truck off started it back up and the noise want there.
Unpluged egr and capped off vacuum port on tbi nothing. Pulled IAC and found this filthy and a damaged spring. Guess this could be my problem. Local parts stores only had borg warner and house brand. All aroun$50. I can get a acdelco for cost threw work for $32 but have to wait till Tuesday if I go that route. I may just get the part store one see if it fixes it if not I'll return it and get the delco and continue to troubleshoot
Had some time to mess with the truck. Egr drops 2inhg in 20 seconds, also found what seems to be a loose ground wire coming from battery terminal to fender ground. Also cleaned my grounds to thermostat housing. I only have two grounds.
1 from battery to head
1 from frame to body that's small braided one. I thought there was suppose to be at least one more.