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Going to reiterate what I said in post #3 take strip off before striking pin. Wish I had listened to my own advice, I hit the pin and shattered the ceramic on the heating element WTF!
I like using a C clamp for this reason among others. Very precise and can be adjusted while the fuel pump is running.
I use a small 6 mm socket on the pin for the clamp to push down on. Similar to the below warm pressure adjustment
Going to reiterate what I said in post #3 take strip off before striking pin. Wish I had listened to my own advice, I hit the pin and shattered the ceramic on the heating element WTF!
Oh god damn, that sucks!
Rotten luck, can you buy those separately?
Ordered one from Germany on eBay, keeping my fingers crossed. Called around to our usual vendors here but couldn’t locate. Around $50.00
I was trying to raise it from the inside and never thought to push with c clamp. Oh well drilling and tapping pin this time, no more banging either direction.
Retesting today to try and the the CIS set up. Below is the reading for SP which is excellent but watch when I turn the fuel pump off. For note, a new accumulator has just been installed and a new fuel pump with stop valve last August. Any thoughts? Gauge drops near zero within a few minutes.
Your video doesn't show it dropping all the way to zero but I assume it does in the next 5-10 seconds?
Either the new(..) accumulator is bad or the new (?) check valve on the fuel pump is bad.
RE: the application of vacuum to the WUR during control pressure testing, here's the WSM specific to '79 5-speeds. You apply vacuum to the upper nipple on the WUR, pull vacuum with a mityvac to 1/2 a bar (15 in Hg).
RE: the application of vacuum to the WUR during control pressure testing, here's the WSM specific to '79 5-speeds. You apply vacuum to the upper nipple on the WUR, pull vacuum with a mityvac to 1/2 a bar (15 in
Sorry, Yes, drops to zero shortly thereafter. I'll move to the fuel pump.
In regards to the WUR, that is what I didn't understand from the WSM above. Thank you for providing direction with the bold/underlined portion.
Yeah...I'm not grasping this. Based on WUR temperature, I should be at 22.5 psi on the gauge for CCP. If I apply 15 in. of vacuum to the top nipple...a. it doesn't hold that vacuum (slowly bleeds off), b. I can adjust the pin all the way back up to starting position and never get to 22.5 psi.
EDIT: I need to adjust the pin down, not up!!!!! F***!!!
Last edited by streetsnake; 04-01-2023 at 04:49 PM.
Pull from bottom. Don’t know if it will raise it enough but should raise some if working properly.
Thank you Mr. Edwards for that graph it is the first time I have seen applying vacuum for ccp. I have WSM but missed that page.
Don’t agree, upper is atmosphere lower is where to pull vacuum.
You may very well be right, I have to confess I'm confused by this top vs. bottom vacuum port testing thing. The Bosch K-jet manual is confusing- two consecutive images on page 2 of the attached PDF, the upper showing 'vacuum' at the lower port, and then a mityvac attached to the upper port. I'm interpreting it to mean 'upper' but I could be wrong. My car seems to run ok based on warm control pressure adjustments using the upper port, but it hasn't really been warm yet, guess I'll find out.
I agree, very confusing but I tried both and won’t hold vacuum on top and have read several different right ups , don’t recall where, to use bottom. After having apart again and separating the bottom you can see where the membrane in bottom will change pressure on spring and raise and lower pressures depending on vacuum. Idea is with WOT vacuum drops pressure drops and enriches mixture.
I think I might finally be figuring this system out?
I agree, very confusing but I tried both and won’t hold vacuum on top and have read several different right ups , don’t recall where, to use bottom. After having apart again and separating the bottom you can see where the membrane in bottom will change pressure on spring and raise and lower pressures depending on vacuum. Idea is with WOT vacuum drops pressure drops and enriches mixture.
I think I might finally be figuring this system out?
It’ll hold vacuum from the bottom, but not the top. In the pic, vacuum is being help at 15.
03-29-2023, 07:27 AM
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