Mechanics

MYSTERY SOUND

1991 Pontiac Transport • FWD •

1991 Pontiac transport minivan - after shutting off the van a motor running sound begins coming from the rear driver's side. It runs for several minutes and then shuts off.
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56jiliz
March 17, 2011.



Can you get under there and pinpoint the noise.

PROTECH1980
Mar 17, 2011.
Looks like it is coming from something under the van at the point where you put in the gas.

Tiny
56jiliz
Mar 17, 2011.
Could it be coming from your tank? As in your fuel pump buzzing or humming? Pump will run for a few seconds after you shut the vehicle down.

PROTECH1980
Mar 17, 2011.
The noise begins about 10-15 seconds after I shut off the van. Sounds like a generator beginning to run.

Tiny
56jiliz
Mar 17, 2011.
Does the vehicle have air shocks in the rear, possibly a compressor running? Maybe the van was modified for handicap accesibility and was equiped with air shocks.

PROTECH1980
Mar 17, 2011.
How long does the sound last?

PROTECH1980
Mar 17, 2011.
I don't know if it has air shocks. This just started happening about a month ago. It runs for about 5-10 minutes then stops. Another post asked if the van had a self-leveling suspension and this is the compressor runnng until the air pressure is boosted to the point that levels the van. Said to check for leaks in the hoses to the rear shocks. This sounds like what you are asking also. I'm obviously not fixing this myself. Just hoping it isn't a major thing and wondering whether to ask the mechanic or go to the electrical repair shop.

Tiny
56jiliz
Mar 17, 2011.
Yes, more than likely it is the compressor running overtime, it is normal to run for say, 5-15 seconds but 5 minutes is way too long, have it checked out for possible leaks, bad shocks, level sensor etc.

PROTECH1980
Mar 17, 2011.