mzdfc3s

iTrader: (2)

ive spent all morning looking thru old posts but really cant find any info that is revealing.....on the way to work this morning after about 35 minutes or so, when approaching a light i bumped the revs to match 2nd gear and started decelerating. from about 4k down to 2.5k i got a really unusuall ticking coming from what sounded like was right behind the dash or underneath the dash right in front of me. so i pulled away and got the same thing w/accel starting at 2.5k all the way up. when it comes it is slow, and become very fast when the RPMs get higher.

i really wouldnt expect injectors or valves to sound like this. car only has 2300 miles??? any thoughts.

maximumsportZ

iTrader: (25)

You have oil in your car right?

mzdfc3s

iTrader: (2)

jtabraham

iTrader: (46)

Does it sound like current arching? I had a similar problem in a previous car where I had some arching in one of my coil packs that would tick proportionate to the speed of the engine.

mzdfc3s

iTrader: (2)

uh, well im not sure....where are the coil packs located? it did seem to be louder as i got closer to redline. it wont do it when the car is not moving aka-just revving it. a free rev while moving it would do the same thing at the same rpms though?

maximumsportZ

iTrader: (25)

The injectors on our car's are known to be noisy and produce a ticking noise. Is it a tick or a tap like metal to metal ?

jtabraham

iTrader: (46)

Because our cars are direct-injected, there is a coil pack over each cylinder.

Let the car idle and see if you can determine where the ticking is coming from. You may want to buy a mechanics stethoscope from harbor freight ($5.99)

mzdfc3s

iTrader: (2)

theres no tick at idle, it doesnt sound like metal ticking...maybe more towards a plastic sound, i dunno?

failsafe306

iTrader: (38)

Try unplugging the sensor harness from your EVAP control solenoid, that's bolted to the plenum, near the back passenger side. You'll get a CEL, but if the noise stops, it's a bad solenoid.

mzdfc3s

iTrader: (2)

well, it didnt do it on the way home yesterday...but sure enough it was ticking away on the drive into work today!?! the last two days it was <60 degrees for the morning commute, so that must have something to do with it?