Location: Farmington Hills MI
Posts: 359
My VIN: 2203
Club(s): (SEDOC) (DCUK)
Calling all K-jet experts! I think my WUR is not working correctly. After the car has warmed up it acts like it starving for fuel under heavy acceleration. I hooked up a k jet pressure test kit and the pressure goes from about .5 bar to about 3 bar once it has warmed up. Should the vacuum enrichment be working after warming up?
Thanks
Jayce
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Location: Leonardtown, MD
Posts: 9,006
My VIN: 03572
Sounds like your pressure is close to correct. I get about 50 PSI control pressure warmed up (3 bar = 44 PSI).
Ignition vacuum advance should only occur after engine warmup and not at idle (idle switch not on).
I assume you have set your mixture via dwell reading the lambda system.
Location: Farmington Hills MI
Posts: 359
My VIN: 2203
Club(s): (SEDOC) (DCUK)
I have adjusted my mixture, however my the reading on the dwell meter doesn't change when I turn the adjustment screw.
I am also running open loop.
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Location: Leonardtown, MD
Posts: 9,006
My VIN: 03572
Dwell will not change adjusting the mixture if your open loop. Your probably running to lean if your problem is poor acceleration. I'm guessing you adjusted mixture for best idle. You will need to adjust it richer.Originally Posted by RamblinDMC
Make sure your ignition timing is correct with the correct advance (vacuum and mechanical).
Last edited by Bitsyncmaster; 01-28-2017 at 10:45 AM.
Location: Farmington Hills MI
Posts: 359
My VIN: 2203
Club(s): (SEDOC) (DCUK)
Adjusting the mixture screw to make it run richer doesn't always help.
Interestingly, after the car warms up, and I connect the vacuum line going to the spark advance to the WUR so now that I have vacuum enrichment, the car runs wonderfully.
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Location: Leonardtown, MD
Posts: 9,006
My VIN: 03572
I was adding that to my post. Correct advance will give you a lot of power if it was not working.
Location: Farmington Hills MI
Posts: 359
My VIN: 2203
Club(s): (SEDOC) (DCUK)
For some reason it runs better with the vacuum advance disconnected and vacuum enrichment on the WUR active while warm.
I do think if the timing was off, it would always run bad. The car starts and runs just fine while cold.
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Posts: 1,027
My VIN: 500 ft pounds torque.
Club(s): (SEDOC) (DCUK)
If the car has vacuum going to the wur (when hot) then the switch under the manifold has failed. The car should not have vacuum on the wur when hot, only when cold. Running like this will result in the car loading up and act like hesitation. Symptoms are runs fine cold, and stumbles hot....
Soundkillr was here.
Location: Farmington Hills MI
Posts: 359
My VIN: 2203
Club(s): (SEDOC) (DCUK)
It doesn't have vacuum while hot. However if i give it vacuum it runs better for some reason.
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Posts: 125
What did you do to your mixture screw? Ended up turning clockwise or anti-clockwise?
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Dave M vin 03572