Odd faint alarm type sound drivers side Disco turned off...
#1
Odd faint alarm type sound drivers side Disco turned off...
Hi I was just out with a flashlight checking all my vacuum lines due to a P1415 code and noticed a faint repeating alarm type sound coming from the drivers side firewall area in between or around the master cylinder and IAC. It was very quiet outside and thats how I noticed it, any clue as to what it is? The truck was turned off, no key in the ignition. I put the key in and turned to the first position and the faint alarm type sound continued, I turned the key to the second position and the noise continues and the IAC has a constant steady tremble also with the key in the the second position. I started the truck and could not hear the alarm type noise due to engine noise and the IAC was no longer trembling. I recently had codes read and have P1300 Cat-multiple misfire, P1590 Rough Idle code and P1415 Aux emission control (possible vacuum hose off, lose or cracked) I know from the threads that changing my spark wires to 8 mm (I ordered Kingsborne 8 mm today) should fix the P1300 as well as the P1590 (I will also be doing the ABS mod repair using option B) but would any of these codes cause the repeating faint alarm sound? I cannot hear the noise at all when I walk to the passenger side and listen for it.
Thanks in advance,
Aaron 717.645.1328
Thanks in advance,
Aaron 717.645.1328
#3
#4
Is the sound on the driver's side almost like an electronic stopwatch ticking quickly? If so, it is coming from the ABS modulator. Normal. I can go down to my vehicle in the garage that has been turned off since 10PM last night, raise the hood, and the sound will be there. You can test by unplugging the single black wire that plugs into the engine side of the modulator to see if the sound stops. Years ago, I was alarmed by this sound thinking it was going to cause battery drain, but the vehicle firing right up after setting in an airport parking lot for over a week eliminated that fear.
Several other people on this forum have reported the same noise from the modulator with the vehicle off, key in pocket.
Several other people on this forum have reported the same noise from the modulator with the vehicle off, key in pocket.
Last edited by lordmorpheus; 11-11-2011 at 11:13 AM. Reason: wire number and colour
#5
Is the sound on the driver's side almost like an electronic stopwatch ticking quickly? If so, it is coming from the ABS modulator. Normal. I can go down to my vehicle in the garage that has been turned off since 10PM last night, raise the hood, and the sound will be there. You can test by unplugging the single black wire that plugs into the engine side of the modulator to see if the sound stops. Years ago, I was alarmed by this sound thinking it was going to cause battery drain, but the vehicle firing right up after setting in an airport parking lot for over a week eliminated that fear.
Several other people on this forum have reported the same noise from the modulator with the vehicle off, key in pocket.
Several other people on this forum have reported the same noise from the modulator with the vehicle off, key in pocket.
#6
Thanks guys for the reply...
Mike I did my plugs about a month ago, I had NGK Iridium plugs in and they made my truck run poorly so I switched to NGK G-power plat plugs. I'm hoping the new 8 mm Kingsborne wires will fix the 1300. Im am just doing the ABS mod part B this weekend cause the shuttle valves etc wont be here for a week so I will just have to pull it off again. I have time this weekend to do it so i might as well. Wires should be here next week and that job looks like a royal pain in the ***...
Savannah its like lordmorphes said and I did unplug the ABS mod and it went away. I take it that is a normal sound for the ABS mod to make?
Mike I did my plugs about a month ago, I had NGK Iridium plugs in and they made my truck run poorly so I switched to NGK G-power plat plugs. I'm hoping the new 8 mm Kingsborne wires will fix the 1300. Im am just doing the ABS mod part B this weekend cause the shuttle valves etc wont be here for a week so I will just have to pull it off again. I have time this weekend to do it so i might as well. Wires should be here next week and that job looks like a royal pain in the ***...
Savannah its like lordmorphes said and I did unplug the ABS mod and it went away. I take it that is a normal sound for the ABS mod to make?
#7
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