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Naio's avatar
Naio
Explorer II
Apr 20, 2016

Mechanical checks on a used van before purchase?

I'm looking at vans with 80-160,000 miles.

Normally with a used car, I take it to a mechanic for an inspection before deciding on a price. But mechanics are telling me that, with these big vans, it is too much work to get at the engine to look at compression, spark plugs, or anything. Like $400 in labor too much.

I did find a trans guy willing to do general inspections with extra emphasis on transmissions, and I figure he knows enough to get a good sense of a tranny from the outside. (Is this realistic?) I didn't ask him specifically about engine stuff.

What do you all expect from a pre-purchase inspection? And what do you get?

If you do it yourself, what do you do? I mean, I do all the basics -- drive, listen, feel, check fluids, tire dates, crawl under the rig and look for anything untoward. But I am not even a shade tree mechanic, with cars younger than me ;).
  • Like a doctor who proposes "Non-Invasive-Diagnostics"

    He does it from an adjacent room listening to a glass held against the wall

    Can't turn the clock back on 160,000 miles. The best you can hope for is a worn out engine that somehow passes a smog test.

    First of all a "Compression Test" is next to worthless: A "CYLINDER LEAKDOWN TEST"

    Shifty sellers change the oil and use SAE 50 to reduce blue smoke and raise the oil pressure a smidge off the "Danger Low Oil Pressure" peg

    Run your finger around the inside of the tailpipe. If it comes out black and oily - BAD. Remove top of air filter housing. Wet oily housing - BAD.

    Remove dipstick. Smell it. Oil burners and compression leakers leave a telltale rank smell which is embedded in the varnish on the stick. A good engine's dipstick will smell like new oil.

    Take a pocket B.S. detector. If it overloads and catches fire a block before your destination, turn around and flee.

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