Location: Lansing, MI
Posts: 1,168
My VIN: 10270
I know I would test w/ vac disconnected just to be sure. I would also do the warm tests using the vacuum pump just to see what the results are.Originally Posted by Trstno1
If you are the type that likes to tinker both cold & warm pressures are adjustable and rebuild parts are available, but I don't feel qualified enough to write a comprehensive guide.
Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection
Location: Anchorage, Alaska
Posts: 847
My VIN: 5625
https://youtu.be/mMcAa-yobTg
Here is the video of the test for control pressure with the electrical and vacuum pulled from the WUR. Looks like a little over 30 psi..... Does this warrant WUR replacement or is it just a sign it may be going out? Remember I just replaced a seized ISM that was 3/4 closed.
After the video was taken I hooked up the vacuum and electrical to the WUR and it slowly climbed to 50 psi until it stabilized.
On a side note i did test the cold start valve in a jar while plugging the pipe hole with one finger and someone cranking the starter. The cold start valve sprayed fuel until the engine started and the key was let go from cranking. So now I know the thermotime switch and cold start valve is good.
I don't have a vacuum gauge but just blew into th vacuum delay valve and noticed when I blew from the black side air passes, but if I blow from the white side it feels restricted. This is normal right?
Last edited by Trstno1; 03-09-2016 at 09:37 PM.
You can't buy happiness, but you can buy a DeLorean and that's sort of the same thing....
Location: Lansing, MI
Posts: 1,168
My VIN: 10270
The graph in the manual isn't very precise, but at what you're showing on the gauge for a dead-cold car would be normal if the ambient temp was between about.. 55-70 degrees or thereabouts?
Your VDV test sounds about right.
To follow the vacuum port test to the letter you do need a handheld vac pump or some other source with a gauge so you can set it at 13-16 in/Hg. You could probably just tap it into manifold vac and see if it drops to around the 1.4-1.8 spec'd in the manual (from the 3.4-3.8 warm control pressure).
Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection
Location: Anchorage, Alaska
Posts: 847
My VIN: 5625
Yup, I think the temp in the garage is at 60 degrees. So the WUR is good! Yayy! That saves me some money. I really appreciate the help!!
You can't buy happiness, but you can buy a DeLorean and that's sort of the same thing....
Location: Lansing, MI
Posts: 1,168
My VIN: 10270
Do that warmed up vacuum test first then you can celebrate
Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection
Location: Anchorage, Alaska
Posts: 847
My VIN: 5625
Will do. I have the vacuum gauge on order now. Though I must admit without touching the accelerator on cold start up, the car will crank for a little bit prior to starting and the hunt pretty bad for a minute prior to calming down at 775 rpm. Then just run a little lumpy.Do that warmed up vacuum test first then you can celebrate
Any other things this could be? Cold start valve tested good. It sprays fuel when cranking starter and shuts off once starter is not engaged anymore. Could this simply be a fuel injector issue?
You can't buy happiness, but you can buy a DeLorean and that's sort of the same thing....
Location: Lansing, MI
Posts: 1,168
My VIN: 10270
Gauge or pump? One of those Mightyvac (or similar) hand pumps is what you're looking for. They're useful for other things too.
In the mean time you could at least verify that the upper and lower chambers hold vacuum by running a line to each, sucking the air out, and seeing if it holds.
With the WUR ruled out you'll then venture off into other parts of the system that I don't have a lot of experience with but others do.
Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection
Location: Anchorage, Alaska
Posts: 847
My VIN: 5625
Could you show me a pic of the pump you are talking about?
You can't buy happiness, but you can buy a DeLorean and that's sort of the same thing....
Location: Lansing, MI
Posts: 1,168
My VIN: 10270
I'm on mobile right now, but if you Google Mightyvac you'll see what I mean
Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection
Location: Anchorage, Alaska
Posts: 847
My VIN: 5625
Ok, got the pump. Where exactly do you hook it up? And how exactly do you connect the test? What are the desired results?
You can't buy happiness, but you can buy a DeLorean and that's sort of the same thing....
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