1990 Chevrolet 1500 Pickup Q&A
1990 Chevrolet 1500 Pickup Question: "service engine soon" light comes on then in a few minuets goes out.
But no codes show when it is checked. In OD it hesitates but accelerate it stops and goes right on. Also it will die going down the road, put in neutral turn key will fire right back up. Sometimes start it put it in gear it will die, but will start then put back in gear, no problem. 350 CID Auto 700 R4 tranny. Tilt steering, shifter on the column. - Mr65Chevy
Is the stalling usually worse or mostly noticeable when the vehicle is warmed up and after coming off the highway/freeway from a long cruise, or at lower engine RPM under a load (like turning the steering wheel) or does temperature, engine load or engine speed make a difference at all? First I would say check the distributor components. Pull the distributor cap and check the condition of the cap and rotor contacts. Also look for the dreaded "green fuzz" corrosion commonly seen. If there is green fuzz on the wiring at the control module, or where the module mounts to the housing, disconnect, remove and clean all that away and reinstall it with some dielectric grease on the mounting side and the connectors to the wires. If the green fuzz is around the reluctor wheel (shaft center) or the windings around it, replace the distributor. If there is no corrosion, and no burned cap and rotor contacs, then take a small metal (can't be aluminum or anything that won't stick to a magnet) screwdriver and touch it to the reluctor wheel on the shaft. Try and then pull it away from the reluctor wheel. You should feel some resistance (pull back) from the magnet. If there is not magnetic pull to the screwdriver, you have a weak magnetic reluctor wheel and need to replace the distributor. Also check that the timing connector (usually a single wire black connector (with a Tan wire w/ black stripe) located either close to the distributor on the wiring harness, or under the black plastic cover on the firewall that houses a power distribution center, or in the vehicle on the passenger side in the wiring harness just below the heater box. Make sure it is plugged in securely. - ChevyASE