Have you replaced the burners? Sears and big box stores (Home Depot/Menards, etc) have generic replacement kits. Pretty easy instructions. I change mine each season. Hope this helps.
SOURCE: flame on gas grill is too small
From: http://bbq.about.com/cs/replacementparts/a/aa071100a_3.htm
Symptoms and Solutions
Low Flame: The grill just doesn't want to heat up.
This can be cause by several things. Taking it from the fuel source to the flame, lets start with the burner.
Newer propane tanks contain a self regulating feature that will automatically slow down the flow of fuel if it thinks it's too high. This can be solved by turning the tank valve off completely and disconnecting it. Open the control valves (on the grill control panel) and ten close them. Reconnect the fuel tank and slowly turn on the valve. Now light the grill to see if that fixes it.
Otherwise check the control valve(s) and venturi tubes for obstruction and alignment. Make sure that the flow of fuel is continuous.
Check the burner for clogged gas holes. You can usually see this problem by observing how the grill burns. If there are spots without flame then you probably have a clogged burner.
SOURCE: Gas grill not lighting
Sounds like you have a faulty regulator. If you replace this make sure that you get a replacement of the same size.
SOURCE: troubleshooting amana gas grill
From a tag that came with the grill -
"To ensure proper gas flow, all of the burner control valves MUST be off before opening the LP cas cylinder valve.
When turning on the LP gas cylinder valve, make sure to open the valve SLOWLY two complete turns to ensure proper gas flow.
All LP tanks now come equipped with a leak detection device internal to the tank, when gas is allowed to escape rapidly it will restrict the gas supply to the appliance. Opening the valve rapidly may simulate a gas leak, causing the safety device to activate, restricting gas flow and causing low flames or poor ignition.
Opening the valve slowly will insure this safety feature is not falsely triggered."
I would guess you triggered the tank failsafe inadvertently.
SOURCE: My Q 120 grill will
Often with a big bottle, people turn the gas off and on at the big bottle and leave the grill valve open. That makes the regulator see a low pressure on its output, which is a potential leak indication. It goes into "bypass". Try turning off the tank, turning off the grill valve, and turning on the tank, then waiting 20-ish seconds before turning the grill valve on.
SOURCE: heat is about low or just a little higher on high setting
Low flame, low temperature, yellow flame: This has become the biggest problem with many grills these days and it's almost always because of the regulator (the funny UFO shaped thing on the gas hose). Regulators seem to be stickier these days and when they stick you don't get enough gas to generate a good grilling temperature. To get your regulator unstuck you need to release the pressure on it. Follow these steps exactly:
To keep the regulator from sticking again make sure that you turn off the control valves first, then turn off the tank valve. Always open your tank valve slowly.
If this doesn't work give it a second try. If you still have low flame then you probably have a faulty regulator that will need to be replaced.
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