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#1
08-11-2014, 12:56 PM
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What readings should I expect testing W124 vacuum control valve?
If, with the engine off, I apply vacuum directly to the input (i.e. port that comes from the the vacuum pump) of the vacuum control valve, what reading should I expect? Should it hold vacuum?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
08-11-2014, 01:33 PM
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With engine idling and 22" of vacuum supplied, I only get 5" of vacuum at output.
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#3
08-11-2014, 03:17 PM
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Hmm I always thought those worked like this:
Max vacuum at idle and as you throttle up vacuum tapers off to a lower number? What happens when you move the throttle through its range?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#4
08-11-2014, 03:35 PM
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Quote:
In my case, at idle it's 5". As I apply throttle, it goes to a high of 6" then drops to 0".
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#5
08-11-2014, 03:46 PM
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Hmmmm so what all is not working? Headrests? HVAC problems? How is shifting?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#6
08-11-2014, 03:52 PM
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Quote:
So symptom wise it's not a big deal. But I wonder about strain on pump.
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#7
08-11-2014, 03:51 PM
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Yeah sounds like your high should be 11-13 or so inches then it should taper off down to zero.
Wonder if mine is working well or not..
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#8
08-11-2014, 03:54 PM
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Hmmm these symptoms might be similar in my car too.
The line that feeds the headrests branches off to the hvac too?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#9
08-11-2014, 03:56 PM
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Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#10
08-11-2014, 03:56 PM
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Kris, I think you need to branch out beyond cruise control units and start repairing VCVs!
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#11
08-11-2014, 03:58 PM
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Ha! Not thinking there is any electronics in that guy. Probably just a torn diaphragm or rubber jibblets. Any effects on your hvac?
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#12
08-11-2014, 04:02 PM
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Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#13
08-11-2014, 04:05 PM
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Quote:
I seem to vaguely remember a 5-6" reading when I checked at the switch over valve tree... HMMMMMMM
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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