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+--- Thread: Anybody know what this box is? (/showthread.php?tid=4739)
Anybody know what this box is? - dieselsmoke300d - 07-18-2013
I found it under a panel by the passenger door in the '85 300SD I just bought. I googled it and came up with nothing. Is it something emissions related?
![[Image: 20130718_183434.jpg]](http://zarnochwf1.com/gallery2/v/firestar/20130718_183434.jpg.html)
RE: Anybody know what this box is? - larsalan - 07-18-2013
that egr label sure sounds like emissions
Does that thing open up? Maybe there is some electric or vacuum control shit in there.
http://lmgtfy.com/?q=0025456032
RE: Anybody know what this box is? - Austincarnut - 07-18-2013
(07-18-2013, 05:42 PM)dieselsmoke300d I found it under a panel by the passenger door in the '85 300SD I just bought. I googled it and came up with nothing. Is it something emissions related?
EGR computer
RE: Anybody know what this box is? - Simpler=Better - 07-19-2013
Don't trash it just yet, I remember hearing somewhere that this can be used to wire up a tachometer
RE: Anybody know what this box is? - Austincarnut - 07-19-2013
(07-19-2013, 08:04 AM)Simpler=Better Don't trash it just yet, I remember hearing somewhere that this can be used to wire up a tachometer
'85 should have a tach
RE: Anybody know what this box is? - dieselsmoke300d - 07-21-2013
Well I ran the numbers and apparently it's the cruise/engine control module. I don't know why it has EGR on it.
RE: Anybody know what this box is? - larsalan - 07-22-2013
I think your part is pictured here...
http://www.peachparts.com/shopforum/diesel-discussion/218933-tach-not-working-1985-300td-alda-related.html
In post #3 as part labeled '80'
RE: Anybody know what this box is? - w123love - 07-22-2013
On 85 models it has a tach computer in it as well as EGR function. The 85's use two tach inputs, one on the transmission and another on a normal spot (where ever that is). Your tach won't work if you take it out. You can disable the EGR at the source and have no issues.
RE: Anybody know what this box is? - Austincarnut - 07-22-2013
(07-22-2013, 09:32 PM)w123love On 85 models it has a tach computer in it as well as EGR function. The 85's use two tach inputs, one on the transmission and another on a normal spot (where ever that is). Your tach won't work if you take it out. You can disable the EGR at the source and have no issues.
the 'normal' spot is for test only, the tach signal is taken from ring gear teeth by sensor on trans adapter. the engine in '85 or california is prewired for the older style tach but no tach amp or wiring from plug