- What Causes Thermoquad Flooding?
- TQ Dies At A Stop
- Thermoquad Carburetor Surging
- Thermoquad Runs Lean
Is the brass float measured the same as the nitrophyl?
Yes it is.
Your Thermoquad TQ dies when hot and comes to a stop.
The Carter Thermalquad was Carter's answer for Rochester's Quadrajet. The thermal plastic main body stopped percolation, but preformed like a Quadrajet. The problem was the Plastic main body cracked because the long screws that held the Air Horn and Throttle Body (through the main body) caused it to crack when tightened incorrectly. They used an Epoxy to hold the plastic main well caps to the plastic main body and it held up.
Carter Tech line said to replace the Main body on each overhaul and bodies were available for about 45 bucks then, but no longer! They would leak fuel into the intake manifold, raw fuel smell, hard hot start, idle rough, die at stops.
Some other possibilities:
- A damaged air horn gasket
- High float level (heavy floats or incorrect adjustment)
Hesitation, or Bog
- Distributor advance mechanism not working correctly.
- Accelerator pump cup dried out, damaged by ethanol, or just worn.
- Accelerator pump passage plugged (ethanol will do this).
- With engine off look down the carburetor and pump the throttle once. You should see 2 good squirts of gas from the main discharge. If not, then your problem is in the accelerator pump circuit.
ACCELERATOR PUMP CUPS FAILING
- Cups may not be ethanol ready. Be sure you are buying non black cups that are being currently produced, like our cups.
- High concentration of ethanol can cause even the best cup to fail.
- Too much chemical being added to the gas. We recommend our Ethanol Defense.
- Accelerator pump well may need polishing. Today’s gas has much less lubrication these days. Polish the well with crocus cloth to provide a smooth glide.
- Letting the engine sit for prolonged periods will cause ethanol to sit at the bottom of the pump well.
