84 Urvan. Totally loses power. Very little response on accelarati
Starts and idles ok but breaks down under load. Seems to be a flat spot such that when increase throttle past idle it doesn't respond. Had to limp it home.Points had lump, filed and reset to about .5mm. No longer backfires but other symptoms the same.
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Since you changed the sensor we will assume it is working. When you disconnect it you put the computer in limp mode which stops it from using sensor values. If code 300 is the only code we will assume the coolant temp sensor and others are ok. I would check fuel pressure with a gauge next.
Even tho the ignition seems ok, I'd check the ignition cables to the plugs. Sometimes these break down over time... it will idle and drive ok, but when you need power for a hill, or acceration, that's when the wires faults start to show up. A quick test is to put the car in drive with your left foot on the brake FIRMLY while you press the accerator... if the miss and lack of power shows up, it's usually the ignition cables to the plugs. k
What have you done so far? Does your van have electronic ignition or points? If the latter i'd check/replace points, capacitor & white, low tension wire inside distributor. Also check the spark plugs (all four should have the same grey/brown colour) & H.T. lead resistance, especially if the fault occurs under load/acceleration.