20 Most Recent 1994 GMC Sierra - Page 2 Questions & Answers

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Check the brake switch (although I don't know exactly where yours is located....start near the pedal). When you find it make sure the pedal actually operates the switch and it hasn't come away from any fixing point and try to manually operate the switch and check your lights. Some switches operate by being pressed by the pedal operation and others by a spring that pulls the switch. If still no lights then short out the wires and see if the brake lights work then. If they do then the switch is faulty. If not then it is a wiring issue.

code 13 is Oxygen Sensor Circuit No signal to computer

gm has had a lot of trouble with the buttons on the dash replace the switch

make sure all vacuum lines are connected properly and there are no pinched fuel or air lines. Also make sure all electrical connectors are properly installed.

I would be looking at the coil and ignition module. Check the plugs first for corrosion. Since coils don't come back to life that quick. I would remove the module and have it checked, call first. Some parts stores can still check them.

how fast it turn over did you check the voltage in the battery? if you did check to see if there is spark at the plugs if there is spark check to see if it getting gas if you are getting gas remove a spark plug and check for compression by using a compression tester if you dont have a com/tester stuff something in the spark plug hole and roll ove the engine and it should blow out with force that will hit the hood hard then after checking all of the cylinders and they all seems to have good compression check your spark plugs if they are wet with gas replace them they may be faul out change them and you should be on your way

Hi there I am technology tech mechanic I work on electric and man. I come from line line of mechanics I am 5gen the switch has to be replace no other way to do but first you need to test the whole circuit for a open circuit

All the time ? Cold or hot doesn't matter ? ETC- engine coolant temp. sensor . What engine ?

Hello Don, I would replace the fuel filter.

Sounds like fuel injection issues. Could be the injectors, could be the clogged filters, or dirt in the tank. Could also be electrical problem, related to the alternator. If the battery is weak, the alternator is probably bad. Check those first.

if you replaced alternator 3 times , have you had your battery tested ? if battery is bad usually that will cause alternator to keep going bad . try having battery tested . might just need a battery

Your idle air controller may be failing. Begin checking for stored codes using a code reader, and progress to standard troubleshooting steps such as checking spark, fuel delivery, and operation of the intake air control circuit.

It fried the control mudgel on the distributer,It is on the back part of the distributer, Buy the bottom of the distributer cap,

NO it should just stop the spark advance .Look at the cam and crank pisition sensors More then likely the crank pisition sensor

The most common causes are a sticky idle speed control valve, a vac leak, or a dirty throttle plate.

yes indeed it is going to! but first check the fuel filter for blockage

check out alterno

Not sure of your engine size so please pick the appropriate diagram:

Coolant temperature and oil pressure senders-4.3L engines

Coolant temperature and oil pressure senders-5.0L and 5.7L engines

Coolant temperature and oil pressure senders-7.4L engines

Coolant temperature and oil pressure senders-6.2L and 6.5L diesel engines