20 Most Recent 1998 GMC Sierra - Page 7 Questions & Answers

get a Haynes book

sounds like vacuum leak spray carb spray around vac hoses

do you have a scan tool to see PID's?

Clogged catalytic converter. 95% sure.

check for spark.. if no spark replace autoshutoff relay it controlls fuel and fire..

Service your fuel system. This will include but not limited to:

• Fuel filter clogged
• Fuel pump relay faulty
• Fuel pump weak or faulty, (yes they can run but not hold pressure)
• Fuel pressure regulator (if so equipped)

with stereos you should be able to call a chevy dealer and find out how to release the code that made the truck lock

Check for hand written no. in owners manual

The regulator in the alternator is most likely the problem.
The alternator could be charging.......just not correctly....... the flickering headlights are showing a varying voltage.......and with the charging light flickering too..........99% chance you need a complete rebuilt alternator.

here are some solutions to your codes and possible causes, maybe you have seen these pages already. when you say the converters are punched out, does that mean there are holes in them? a scan tool does not cause trouble codes, it detects them.http://www.obd-codes.com/p0440http://www.obd-codes.com/p0420http://www.obd-codes.com/p0430

If the question on the 2000 acura is where to find the sensor, you have to take the silver acura plate off (3 screws) and it sits on top next to the big radiator hose. Easy to get to, should cost around $40. But if your temperature gauge on the dash is not moving it's probably the thermostat.

If the engine is turning over, making a wa-wa-wa sound, then the battery is doing its job and there is another starting problem. If the engine will NOT turn over at all, turn key and no engine movement, then the starter is not working.

could be vacume sensor or vacume can.

Ok? not in a gmc sierra unless it is in the bed? is it on a jumping jack tamper?

Bad cell in the battery.. get the battery checked out!

First of all...does your truck have the retained accessory power (RAP)? If it does, the radio would always stay on with the key off until you open the drivers door. If it does have RAP and the door pin on the drivers door has went bad, then the truck doesn't know that you opened the door and continues to allow accessory power (although it would still cut off after about 20 minutes). If the interior lights come on when you open the door, then the pin is ok. If the lights come on, it could be the RAP relay. If it has gone bad, it is possible it is stuck supplying power and needs replacing. The relay should be labeled in the fuse panel, and there should be other relays in the panel with the same part number. You can swap a relay for the RAP relay and see if it fixes the problem...if it does fix it swap the relays back and replace the RAP relay. If the truck doesn't have RAP then it is possible the problem is in the radio..if you have a friend with a GM car or truck close to the same year you could swap radios and see if that fixes your problem...should be pretty simple. pull the cover off the dash, it just clips on, take out a couple screws that hold in the radio, unplug it and plug in the other radio. sorry so long winded...hope this helps you somewhat.

Start with the easiest solution and check the ground cable and the battery cable at the battery, don't just gently wiggle it try to move it with a little force. Also may try to just replace both cables if both are factory after being on the truck for that long they lose continuity especially the ground cable

Is there a check engine light? The most likely cause is your secondary ignition system components, plugs, wires, cap or rotor. An "old school" trick is to use a spray bottle with water and start spraying plug wires, cap rotor when running. Pay attention to the area you are spraying and notice if engine starts running rough. This will give you a pretty good idea where to check. This is a best guess without further information.