vacuum problem

[onjeffriv]

I have a 94 K1500 6.5 td with 135K. I have 24" of vac at the pump. I can get 15" at the wastegate solenoid if I plug off the hose coming from the tee between the egr valve and egr solenoid that goes up to the lil black box with green electrical plug mounted on firewall above master cylinder. But I get a SES. When I hook the hose to the blk box the vac at WG actuator goes down to 5". What is this lil blk box and do you think it is bad?
Scott

[Chevylover]

I have a 94 K1500 6.5 td with 135K. I have 24" of vac at the pump. I can get 15" at the wastegate solenoid if I plug off the hose coming from the tee between the egr valve and egr solenoid that goes up to the lil black box with green electrical plug mounted on firewall above master cylinder. But I get a SES. When I hook the hose to the blk box the vac at WG actuator goes down to 5". What is this lil blk box and do you think it is bad?
Scott



The "little black box" at the firewall is called MAP Sensor or EGR-Baro-Sensor !
Look here :
Turbo_Diesel_EGRBaro_Sensor (http://www.ssdieselsupply.com/product_120_6.5_Turbo_Diesel_EGRBaro_Sensor.html)

What SES do you get ?
Check it out here :
SES Check by your own (http://www.kennedydiesel.com/readcodes.html)


Cu,
Sven

[onjeffriv]

Thanks Sven, and the tech tips link is very interesting. Can't wait to try some of them.
Scott

[Turbo]

Thanks Sven for posting all the codes.This is very helpful.