weak vacuum
#1
weak vacuum
so I have seemed to misplace my haynes manual for my truck and have developed a weak vacuum. Ive checked all the vaccum lines and boots and have found the suction to be pretty weak coming out of the small box bolted to the driver side fender. can anyone tell me what that is or has a diagram of the vacuum system. It appears to be some sort of diaphrame maybe. Ive lost my cruise control, heater vents wont change and had to replace my 4x4 with a posi lock kit due to the weak vacuum.
#2
#3
the mystery box is on the fender so it does not get wet or exsposed to direct sunlight, just remember not to feed it after midnight....
sorry I couldn't resist
Cummins vacuum system is pretty simple, start at the pump and verify pressure.. or lack there of since its vacuum that is being measured, then move forward joint by joint until you fun a significant difference
the box with wires your describing sounds like the low vacuum warning switch, it basically will turn on your red brake lamp if vacuum sucks, or doesn't suck enough in this case... sry I had a few beers , long day at work and I'm doing my best to be funny
anyways, your vacuum pump should create roughly 8-25 inches of vacuum , if this truck was in my stall I would plug everything that enters the firewall and smoke the system, then do the same with the inside vacuum lines i.e. HVAC controls
this should get you started in a good direction, let me know how it turns out
scott
sorry I couldn't resist
Cummins vacuum system is pretty simple, start at the pump and verify pressure.. or lack there of since its vacuum that is being measured, then move forward joint by joint until you fun a significant difference
the box with wires your describing sounds like the low vacuum warning switch, it basically will turn on your red brake lamp if vacuum sucks, or doesn't suck enough in this case... sry I had a few beers , long day at work and I'm doing my best to be funny
anyways, your vacuum pump should create roughly 8-25 inches of vacuum , if this truck was in my stall I would plug everything that enters the firewall and smoke the system, then do the same with the inside vacuum lines i.e. HVAC controls
this should get you started in a good direction, let me know how it turns out
scott
#4
Have you lost cruise control? That "mystery box should be your cruise control box.
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Last edited by ricet07; 03-18-2013 at 08:34 PM. Reason: Automerged Doublepost
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