crying wolf

[max07]

I've had my 1999 suburban for almost 4 yrs now. The engine light came on approx 4 months after I got the truck. Cost me $90 to find out the catalytic converter didn't like something. A month later it's on again. It's come on and gone off at least a dozen times since. If I took the truck to a dealer every time the sob lit up, I'd never get to drive the thing. Will a piece of electrical tape strategically placed solve my problem, or is something else brewing?

[Blue Bowtie]

Do you recall what the specific error code was?

[max07]

Nope. It was a while ago and I have not taken it in again. It turns itself off after a while. The mechanic said it can light up if the gas cap is not tight, if I change brand of gas, oil, etc!?!

[GMMerlin]

Have the code scanned and post it here.

Here is some info

Your vehicle is equipped with a computer which monitors operation of the fuel, ignition, and emission control systems.

This system is called OBD II (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. The CHECK ENGINE light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problem is apparent. This may prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction.

Notice: If you keep driving your vehicle with this light on, after a while, the emission controls might not work as well, your vehicle's fuel economy might not be as good, and the engine might not run as smoothly. This could lead to costly repairs that might not be covered by your warranty.

Notice: Modifications made to the engine, transaxle, exhaust, intake, or fuel system of your vehicle or the replacement of the original tires with other than those of the same Tire Performance Criteria (TPC) can affect your vehicle's emission controls and may cause this light to come on. Modifications to these systems could lead to costly repairs not covered by your warranty. This may also result in a failure to pass a required Emission Inspection/Maintenance test.

This light should come on, as a check to show you it is working, when the ignition is on and the engine is not running. If the light does not come on, have it repaired. This light will also come on during a malfunction in one of two ways:

Light Flashing -- A misfire condition has been detected. A misfire increases vehicle emissions and may damage the emission control system on your vehicle. Diagnosis and service may be required.
Light On Steady -- An emission control system malfunction has been detected on your vehicle. Diagnosis and service may be required