90 GXL non-turbo

Okay, here's what we've checked and found so far after bringing her home from 4.5 months at a shop.

Sent injectors to RC Eng - 2 were leaking internally and all were spec'd. Will get them back tomorrow.

In checking sensors, etc. found the double throttle diaphragm not holding a vacuum - can't even pump it. What does this do and does it need to be replaced? If so, how much?

Looks like someone unplugged the coolant level sensor and ran direct to battery ground? Why?

Still checking...

 

What this does is prevent the secondary throttle plates (second set) from opening too fast on a cold engine. On a hot engine, if the water thermo valve is operating correctly, it is disabled. If you leave it connected, you will have a vacuum leak when the engine is cold. On my car, I would have had a vacuum leak all the time (defective thermo valve). So, I capped the throttle body fitting for the line to the thermo valve. Keith and I have an agreement that we will not stomp on the gas until the engine is fully up to temperature. Therefore, we are experiencing no problems at all without the valve functioning.

Running the coolant level sensor to ground is bad! It's bad!
The coolant level sensor applies a ground when the radiator is full. If the water level in the radiator drops, it removes the ground. This results in the coolant level light on the warning light panel coming on and an obnoxious buzzer sounding (because it's an emergency!). The buzzer will sound continuously when the light is on. So people "disconnect" it, just like you described. Of course, if the coolant level really drops, you will never know it, until the engine blows, that is. Fix it, imho!

Irv, Keith's dad

 

he he he