My 94 4.3gmc pickup is running rough after it gets warm i have replaced fuel pump & filter,air filter plugs & wires distributor cap & button ingiton control module still runs rough some times after i trun it off it wont do anything no head light no dome light no dash lights no radio wont trun over at all its like thers no battery had battery tested and its good and fully charged and cables have been cleaned when it does start the heat comes on radio lose its stations and clock lose its time can any one help me please
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Re: 94 4.3 wont start
CHECK THE FUSIBLE LINK THAT COMES OFF THE STARTER POST.THEY LOOK JUST LIKE A WIRE, BUT THEY GET STRECHY WHEN THERE'RE BLOWN.IF THIS IS THE CASE YOU WILL NEED TO FIND THE CIRCUT THAT CAUSED IT TO BLOW,AND REPLACE THE LINK.
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1. Error Code 24. Intake Air Temperature Sensor.
Solution: Check the following:
- IAT Connector and wiring.
- Intake Air Temperature Sensor.
- Engine Coolant Temperature Sensor.
- ECM. 2. Rough Idling when the engine is hot. The following are the reasons due to which the engine can perform bad when it is hot.
- Fuel pump control circuit.
- Fuel pump pressure.
- Fuel injectors.
- Non Return Valve clogged, located on the lower side of car chassis above the fuel tank.
- Engine compression, valve clearance, spark plugs.
might pull that cap again and see if the dist. shaft is loose (side to side play) Sometimes the bushing wears out and the magnet will hit the pickup,makes the spark irratic.Should have a new rotor with the cap,they also go bad.
signs of a bad fuel pressure regulator. the vehicle runs rough, the engine will not start usually in the mornings. many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. black soot on plugs, blake smoke from tailpipe, running rough, stalling. you could have residue in fuel tank and need to change fuel filter again. have a very good day !!
Hello, your problem appears to be the idle control motor located on the air intake manifold it is a small motor that goes bad quite often. Other items that can cause this is a bad /clogged air filter or a tune up (spark plugs and wires), or clogged fuel injectors. to clean the injectors you can buy a container of fuel system cleaner and pour it into the gas tank and as you drive it cleans the system.
Once the fuel system is cleaned via a tankful of cleaner & gas then the idle controller motor would be next on the list to be replaced.