Another dumb question (I should get an award, I know ).

When blowing out the tube to the EBPV sensor, do I need to trace it to it's source near the valve and disconnect it there? And do I need to disconnect the tube from the sensor bracket, or just remove the sensor and blow through its opening to the tube?

Thanks guys.

Kevin

 

Kevin, I tried blowing it out in place by just taking the sensor off but I didnt really notice any difference.

The next weekend I took the tube completely out of the truck and cleaned it with brake cleaner, what a difference

Hint: A crowfoot wrench on a 6" ratchet extension made it easy to get off and a 3' piece of .95 weedeater line worked well sliding it inside the tube and then working it back and forth between sprays with brake cleaner

 

one end of the tube is right between the serpentine belt and the HPOP reservoir, and the other end is in the front part of the manifold like you saw. i think the manifold end takes a 16mm wrench, and the sensor takes a 1" wrench. be careful removing this, as it's a $120 part and you dont want to find out how much you have in your wallet after you pay for a new one to fix a perfectly good one after a stupid mistake.


however yeah the weedeater line is a good idea, also blow out the sensor too, and the manifold boss also.

 

You are dead on on those sizes Kris. A regular deepwell socket works good on the sensor just be careful not to apply to much lateral force as you are breaking it loose.

 

Thanks, everyone. That helps alot. As soon as I rent a compressor I will try the technique. Already replaced the sensor, but had to use a simple crescent wrench as I didn't have a 21mm/1 inch deep-set socket, despite having double of almost everything else . Would have been a lot quicker the right way!

Thanks guys.

Kevin

 

Alsaka...was your line plugged or something? What were your sings that it needed to be blown out or is this just something that we should do everyonce in a while. Amiller93 said it made a big difference, what kind of difference did it make. Just curious. thanks

 

Kris--I'm the master of stupid mistakes!

 

I think Kris has a little better understanding on how it all works but before i cleaned it i would see 2 - 4 psi backpressure no matter what kind of driving I was doing. After cleaning the tube i would see 3 -4 psi at idle and 19 - 20 with throttle. Not real sure what difference it makes overall but it does give the PCM a more accurate view of engine conditions.

 

Oh and judging from the way my tube looked at 83K i think I will be cleaning it around 50K from now on

 

thanks for the info.

 

I need to bump this one time here. I know Ponch asked and Alan did respond but I'm still a little sketchy about this maintenance and whether I should have a look at mine. Can anyone clarify it for me? If it ain't broke, I may just break it fixing it.

 

The only applicable function of the EBP sensor that I know of is to tell the computer to open the EBPV when it's closed and you give the truck throttle. With the valve closed, you will have no power and not be able to build boost, as well as risk some elevated EGTs. If your EBPV opens (when it's closed automatically during cold weather) as you apply throttle, I wouldn't worry about trying to clean out the sensor.

 

Well...

As you know I'm not an authority on the PSD--that's why I keep bothering you guys . However, when I had the truck in the shop for the $900 CPS replacement, they noted that the EBPV was throwing a code and told my wife when she picked it up "it probably just needs to be blown out due to soot buildup..." They hadn't called me at home to tell me of this, probably too embarassed about the total for the CPS .

Soooo, because of cold winters up here and the truck often relies on the EBPV (and I use the Aux. Idle in cold weather), I decided to do it myself. Bought new sensor, was going to just blow out the tube from sensor mount with tube in engine and keep the old sensor as a spare if I could clean it up. However, old sensor is caked with soot and corrosion so bad that the opening is about 1/2 the diam. it is supposed to be...

Needed better advice to REALLY clean out the tube, hence the post asking about the best way to clean it. New sensor is on for now, but I still have the "potato in the exhaust" symptom in warm weather and loss of power. Going to follow Alan and Kris' suggestions to fully clean tube before the snow flies. Getting the Auto Ingenuity so I can check the codes myself. Terry at Blackstone thinks I might have a soot problem in my engine, makes sense the way it is driven and the amount of time it spends idling in winter.

Whew!! A mouthful, sorry for the length.

Kevin

 

Man, $900 CPS. I'd go take out a warrant on somebody after that.

I must have missed it. Did you get your oil analysis back?

 

Never apologize for the posting length. can't have too much info.

Keep us posted on the soot issue, inquiring minds need to know how you make out.