1998 Chevrolet Express - Answered Questions & Fixed issues

Bob, did you ever figure out how to fix this? This is exactly our problem!!

Which engine ?

Ground problem more then likely . Looking at a wiring diagram turn signals an headlamps right front share common ground G-109 . Do you know anything about automotive electrical circuit testing ? Voltage drop testing ? Watch these videos . Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia Electric Testing Techniques You Need to Know Free wiring diagrams at http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on lighting ,then under subsystem click on headlamps .Click the search button ,then the blue links . Look at wiring diagram so you know which wire is which . Power , ground etc... G109 In the right side of the engine compartment, near the fender well !

The idle is computer controlled. Have a look for any disconnected/split vacuum hoses allowing unmetered air to enter the engine which will cause a high idle. Have a look inside the throttle plate and inspect for dirty/black. If so, clean with a carb spray and toothbrush. This can affect idle if the plate is sticky. You may also have a sticky idle air control motor causing this issue

If it is the passlock, you will be getting a 'security' or similar light on your instrument panel. Then you can bypass the system fairly easily. If you have a check engine light, Autozone or Advance Auto parts stores read them for free from the computer connection. You need an OBDII scanner to retrieve the engine codes.

Just one is fine.

Those products do not work Just make the proper repairs Once you add them, they can not be removed, short of a hot tank or acid bath during a rebuild You can find anything you want on the internet You will just ruin the vehicle for the next owner

probably a fuse. if the fuses are good check the brake light switch on the brake pedal.

not enough fuel pressure check filter could be bad pump

There should be a sticker on the hood or radiator support with the size listed, and you can use the 8th digit of the VIN code on the windshield too.

dislocate any wiring harness' (speakers etc.)take a 2x4 and set it up under the door with a floor jack holding it in possition under the door.remove the 3 bolts on the bottom hinge.remove the top bolts.catch the door ...replace in reverse.

if you have replaced ther speedometer sending unit then your dash cluster is the problem chances are that the sending unit was only part of the problem. the cluster is static sensitive so have a mechanic replace it for you, if your not familiar with newer dash clusters, static electricity can short not part but the whole dash unit which is quite costly, so be sure to have a shop replace it, if your not up to the task

Borrow a repair manual for vehicle from a libarry,

It is due to one of 2 things. The ignition key can still be sending the start signal to the starter relay through the small wire in the Relay solenoid; or the starter Relay is stuck after it gets the signal from the key and the key is correctly in the RUN position.You would need to put a voltmeter on the small wire on the starter solenoid. The Relay should not connect the battery to the starter without this small wire attached to it.. If this wire is off and the starter gets power, the relay is bad. If you test the small wire for power, it should only have power in the START position. The small wire should be powerless in any other position.If the small wire has power at other times, the ignition switch is bad.Please rate my info.

P0193 - Fuel injector supply Rail Pressure Sensor Circuit High InputPossible causes- Excessive resistance in the circuit - Low or no fuel - Wiring harness connector of the fuel pressure sensor - Fuel Rail Pressure Sensor - Fuel Pump P0193 Description The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

Did you check the fuses? Sometimes a blown fuse may be the culprit of electrical failures to minor things such as power windows.

with the proper key turn it to crank then release let it sit until the security light goes out do this three time then turn key off for a min then it should start

1) you must test the wires connector from corroded cables , clean it2) Test the voltage for 12vdc for input to the coil of the relais.3) If there are NOT, test the fuse for open and replacle, the fuse box in the hood motor, see the instruction name, and identify the fuse or c.breaker. and replace or repair.4) see the diagram attached and use the logic sense for troubleshooting.God bless you

could be the electrical contact switch on the back of the steering lock ,try a hot wire direct to the small terminal on the starter motor solonoid on top of the starter

This is on a 4L60-E--Automatic Transmission


This is on a 4L80-E--Automatic Transmission


Hope this helps you ??