Stupid motor. Stupid van.





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Uploaded on Jun 17, 2011

Or maybe I'm just stupid.

Motor cranks solidly. It STARTS to kick over but dies. Depressing the accelerator gets a harder attempt to kick but then backfiring through the intake manifold. Fuel pressure is at 43psi (spec needs 35-45) and injectors all read good resistance AND are receiving signal. Every spark plug fires (new NGK Platinum).

Parts changed:

Coil (old was weak, orange spark, lots of carbon deposits)
Wires (all cylinders PLUS coil to distributor, done for safety)
Distributor cap (done for safety)
Rotor (done for safety)
All 8 plugs (including the two joyful guys under the brake manifold, old ones were badly worn)
Crankshaft position sensor (this morning, $45 wasted...)

I've verified no buildup on the MAF sensor. Spark rhythm indicates proper cam position sensor operation. New plugs have the typical black coating you see from being way rich, which is how we determined the crankshaft position sensor (bad sensor reads high RPM, hence longer signal to injectors).

This thing ran fine, even a 500 mile trip last month for my Grandmother's funeral. No issues. Then one day it was hard to start (had to hit the gas), but once it started it ran fine, but you could smell it was running rich. Next day, same thing, hard to start, and then when we were getting ready to move the crew home, it took five minutes to get it started. Once started, rich, but ran fine (no stalling or acceleration issues). Once it got home, it just wouldn't start at all, and I started replacing parts.


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