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Trouble 95 Rodeo 3.2 / Popping Sound

Old 02-09-2015, 06:01 PM
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Lightbulb Trouble 95 Rodeo 3.2 / Popping Sound

I own a 1995 Isuzu Rodeo 3.2 6L 4x4

I'm not sure if all this related, but I want to be sure that I put everything on the table. Of each incident listed below, there were no signs that anything was going bad.
  • I hit a bump while driving.
  • The fan stopped working and the seat-belt light, gas light, and battery light came on and stayed on in error.
  • The battery voltage became low.
  • Neighbor replaced the Alternator.
  • Above problems fixed.
  • Went for test drive.
  • Trucked started to stutter and rattle.
  • Neighbor replaced 2 Coil Packs because one plug out of each pack wouldn't spark.
  • Truck ran GREAT. The best since I got it about 5 years prior.
  • Next morning, I leave for a long trip.
  • After driving for about 20 minutes at 70-75mph, I begin to her a few pops.
  • Sounds like it's coming from the back of the truck.
  • Five minutes later, the pops becomes louder and more frequent, like popcorn.
  • I slow down to about 60mph, it stops.
  • Go to mechanics.
  • They change plug wires and other Coil Pack (I already have new Spark Plugs from January).
  • I leave.
  • I get to about 70mph, it starts again. Sounds like the pops are now coming from under the dash.
  • I return to mechanics. He rides with me. He believes the sounds are coming from the roof.
  • We pull over and adjust the Roof Racks.
  • We drive and the pop starts again.
  • When we return to the shop, they remove the Roof Racks, a loose Mudflat & tighten the radio antenna.
  • I leave.
  • The sound returns. This time at about 30mph.
  • I go by a different mechanic and let him listen from a video I made. He doesn't know, and kind of laughs.
  • I return home.
  • I disconnect the stereo, didn't help.
  • From the driver seat, it sounds like the pops are coming from under the dashboard on the passenger side.
  • When I lean my head over to the passenger side, it sounds like it's coming from the roof. 2 mechanics agree.
  • I have no sunroof or any significant there.

The pops are frequent like popcorn, they sound like someone tapping their finger nails on the roof, but a little more electric & deep (just a little). Almost like the sound of lifting a Coil Pack while the engine is running. They are loud, very noticeable. Driving behind a Semi-Truck on the Interstate made no difference either way.

There are no lights flashing and the truck runs great. It's just the sound.

I would dismiss it as something loose if not for the fact that both the Alternator and Coil Packs went out the day before.

In the last 6 months, I've gotten a new Timing Belt, Water Pump, Alternator, Tires, o2 Censor & Plug Cables.

Could this be related to when I hit a bump? Maybe the tires are out of balance, though the bump wasn't too bad and it doesn't explain the other problems.

Any thoughts?

Last edited by jjmcdade; 02-09-2015 at 06:05 PM. Reason: Error
Old 02-09-2015, 08:21 PM
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Join Date: Jan 2013
Posts: 4


It took a 13 year old to figure out what four 4 mechanics couldn't - not to mention the $300 in unnecessary parts, a full day, a tank of gas and a lot of stress. Turned out being the strip between the front window shield and body, it was loose. Nothing a little duck-tape can't fix until I get to a store.

Just wanted to update this post in case somebody else has the same problem.
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