20 Most Recent 1998 Chevrolet Express Questions & Answers

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