cranks, no start, no code

I am embarrassed to admit that I've been chasing this problem for two solid weeks. I thought I'd post the results on the chance someone else might save some time.

Vehicle: 2002 Ford Explorer EB 4.6LV8

Symptom: Sudden incidence, cranks fine, doesn't start, doesn't set any codes

Inspected and tested, no problem found: fuel tank, fuel pump, fuel filter, crank position sensor, fuel pressure, MAP sensor.

Problem found: Black goo blocking Idle Air Control solenoid valve. The valve is supposed to be open a little bit all the time, and opens farther as the ecu pulses it for more idle air. The engine was getting _no_ air, so it wouldn't start.

Symptom allowing diagnosis: It _would_ start if the throttle was held half open during cranking; it just wouldn't idle. It's been years since I've owned a carbureted car, so I didn't even try opening the throttle until today.

Corrective action: Filled the valve interior with Brakleen and cycled the solenoid with 12V a few dozen times. After the first cycle, the Brakleen started draining out, so I kept flushing until it came out clean, and reinstalled the same valve. Luck was with me; the gasket remained intact, so I didn't even have to replace that.

I am embarrassed to admit that I've been chasing this problem for two solid weeks. I thought I'd post the results on the chance someone else might save some time.

Thanks, I wish more people would post their weird hard to find car problems here after they have been repaired. Now I know if I can't start a car, try pressing half way down on the gas pedal, something I have not tried in years. I no longer own any 4 wheel vehicles without FI and like you, it would take me a while to even think about trying such.

-Don-

Good stuff; I'm glad it turned out well - and thanks for posting both the symptoms and your diagnostic approach in detail. I am betting there are others here who can benefit from this kind of info!

Good find.
IAC valves are expensive, too.

Chip H.