$30 Home Depot turbo system pressure tester (leak finder) - Page 3 - MR2 Owners Club Message Board
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post #41 of 83 (permalink) Old April 29th, 2006, 20:05
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What about the pcv hose? I just built this setup; blocked off the iacv hose, but all off the supplied pressure to the system is just coming through the pcv hose. Is this supposed to happen?

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post #42 of 83 (permalink) Old April 29th, 2006, 20:58 Thread Starter
I aint afraid of no boost
 
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Quote:
Originally Posted by normr2
What about the pcv hose? I just built this setup; blocked off the iacv hose, but all off the supplied pressure to the system is just coming through the pcv hose. Is this supposed to happen?

Norm
Only if you have extreme blowby from blown ringlands.
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post #43 of 83 (permalink) Old April 29th, 2006, 21:53
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I need a little help with this guys, I tried this today and I kept getting air escaping from the intake manifold area.

I was unsure If I correctly blocked off the IAC. Can anyone show a graphical illustration of what to plug?

I have been unable to find my boost leak and I know its coming from the IC area. I just don't know where.
Thanks!!
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post #44 of 83 (permalink) Old April 30th, 2006, 00:55
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Quote:
Originally Posted by NoShoes
Only if you have extreme blowby from blown ringlands.
If I had extreme blowby from blown ringlands, wouldn't I have bad compression? I just checked it and I'm getting 190, 180, 180, 190. Also, when I removed the intake to cap the compressor, there was very little residue inside the intake or compressor opening.

NoShoes, could you please explain why the air would exit the pcv assuming bad ringlands? I would really like to learn this; and I hope to hell I don't have bad ringlands , damn, I was just trying to find a possible boost leak, because of a "whistling" noise I'm getting on hard boost, boost shoots up to 16 and then falls to 12 before redline (ct20b), and lower than normal fuel economy lately. Thanks for your input!

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post #45 of 83 (permalink) Old April 30th, 2006, 05:46 Thread Starter
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Quote:
Originally Posted by normr2
If I had extreme blowby from blown ringlands, wouldn't I have bad compression? I just checked it and I'm getting 190, 180, 180, 190. Also, when I removed the intake to cap the compressor, there was very little residue inside the intake or compressor opening.

NoShoes, could you please explain why the air would exit the pcv assuming bad ringlands? I would really like to learn this; and I hope to hell I don't have bad ringlands , damn, I was just trying to find a possible boost leak, because of a "whistling" noise I'm getting on hard boost, boost shoots up to 16 and then falls to 12 before redline (ct20b), and lower than normal fuel economy lately. Thanks for your input!

Norm
You can try to block off the small vacuum line that goes from the TB to the valve cover. Also, are you opening the throttle body when you do the test?
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post #46 of 83 (permalink) Old April 30th, 2006, 11:56
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No, I didn't open the tb; but I will block that vac line to the vc and re-test. Thanks!!

Also, how much pressure to the system is required for adaquate results? I set the regulator on my air compressor to 20/30 psi, but my boost gauge only read about 5 psi when I first tested. I'm thinking that the air leaking out of the pcv was not allowing the full pressurization. Would 5 psi be enough IYO to find a leak?

Norm
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post #47 of 83 (permalink) Old April 30th, 2006, 12:11 Thread Starter
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You need to open the TB to pressurize the intake manifold, where the vacuum/boost source for your boost gauge is.

In addition, you need to open the TB to find leaks in the fuel rail grommets and the intake manifold gasket!

Original post edited for better directions in regards to checking for leaks post-throttle body by opening the throttle body.

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Last edited by NoShoes; April 30th, 2006 at 12:14.
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post #48 of 83 (permalink) Old April 30th, 2006, 20:00
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okay thanks so much for the help ; one more question please? I'll do the test again with the throttle plate open. Do I also plug off that passenger side vac line going into the valve cover as you mentioned?

Norm
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post #49 of 83 (permalink) Old April 30th, 2006, 23:15
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can anyone share a picture of things to block off for this test. I need help.
Thanks
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post #50 of 83 (permalink) Old April 30th, 2006, 23:47 Thread Starter
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Quote:
Originally Posted by dejital
can anyone share a picture of things to block off for this test. I need help.
Thanks
Buy a factory service manual for your car and keep it in the bathroom for a month. Read it cover to cover.

If you still have trouble figuring out where the idle air control motor is, even after my detailed write-up, find a mechanic that you can pay to do the work for you, or sell the car and move on to something you don't have to work on.
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post #51 of 83 (permalink) Old April 30th, 2006, 23:51
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Quote:
Originally Posted by NoShoes
Buy a factory service manual for your car and keep it in the bathroom for a month. Read it cover to cover.

If you still have trouble figuring out where the idle air control motor is, even after my detailed write-up, find a mechanic that you can pay to do the work for you, or sell the car and move on to something you don't have to work on.
Thanks 4 that.....
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post #52 of 83 (permalink) Old May 3rd, 2006, 22:57
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Quote:
Originally Posted by dejital
can anyone share a picture of things to block off for this test. I need help.
Thanks
http://www.mr2-tech.com/bgb/mechanic..._system/17.htm
http://www.mr2-tech.com/bgb/mechanic..._system/18.htm

I know you have a BGB
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post #53 of 83 (permalink) Old May 3rd, 2006, 23:58
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Its all about the acronyms man!
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post #54 of 83 (permalink) Old May 14th, 2006, 16:25
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While doing the leak test, I noticed a small, but steady amount of air coming from the EGR valve. Is this odd? I do not think it is supposed to do this, but am not sure.
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post #55 of 83 (permalink) Old May 21st, 2006, 20:46
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What tap is everyone using after they drill into the pipe plug? None of the 1/4" quick connect air hose fittings described what thread/pitch the threaded end was. I believe it said 1/4" NPT, but none of the hardware associates knew of a tap that would work for that. Plus, my Home Depot's tap selection was pitifully small.
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post #56 of 83 (permalink) Old June 7th, 2006, 18:11
blown ringland in cyl #3
 
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What about the inlet size of a CT20B? That 2.75" as well?


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post #57 of 83 (permalink) Old June 10th, 2006, 12:47
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The inlet for the 20B and 26 are the same because the stock elbow from the AFM fits both.

I found a 2.75" ID coupling with clamps at AutoZone, and put a 2" pvc cap inside (remember that pvc sizes are ID, so total diameter for the 2" cap is about ~2.5") and just tightened the clamps down on it. Then tap the cap like this...

Quote:
Originally Posted by boostd4
What tap is everyone using after they drill into the pipe plug? None of the 1/4" quick connect air hose fittings described what thread/pitch the threaded end was. I believe it said 1/4" NPT, but none of the hardware associates knew of a tap that would work for that...
Don't know why you had trouble finding a 1/4"NPT tap...I found this at my local Ace Hardware and it has about an inch of taper, so I tapped the plug about midway through the taper, wrapped some plumbers tape on the fitting, and it screwed in great.

Norm

Last edited by normr2; June 10th, 2006 at 12:57.
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post #58 of 83 (permalink) Old June 10th, 2006, 15:00
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Yea, the Home Depot guys were just inept. I found it at Menards.

FWIW, with my regulator at 25psi, I must have had a pretty tight intake system (no big leaks), because no matter how hard I clamped down the rubber coupler on the PVC cap, it would blow off (no lip around the PVC cap) after a minute or so.
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post #59 of 83 (permalink) Old June 11th, 2006, 14:40
blown ringland in cyl #3
 
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I hooked it up and found 2 leaks in my intake system. I was expecting to be shooting oil everywhere because I thought I had a bad ringland in Cyl 3, but (luckily???) nothing came out. What could be the next diagnosis for my low compression? Could it be valves?


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post #60 of 83 (permalink) Old June 28th, 2006, 23:44
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is't air still going to escape doing that through the pcv and open valves?
I have a steady stream of air coming from the pcv but no excessive blowby, maybe 1/3-1/2 a quart of oil every 4k miles.
i ask b/c i have no boost leaks yet my ct26 takes a while to spool still.

Last edited by hookedup96rolla; June 28th, 2006 at 23:46.
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