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Old 02-21-2012, 06:50 PM   #1
 
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Question Chasing vacuum lines

I'm still chasing down that vacuum leak and would like to see a picture of the firewall with the engine out. I know they are out there from you guys who have replaced engines for some reason. If I could see what the arrangement looks like then I can locate the lines with the engine in the car much better.

Thanks,

Pat
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Old 02-21-2012, 07:03 PM   #2
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Your a handy guy Pat. If you remove the wiper cowl (upper and lower) you will see the entire firewall and back of engine, even part of the trans. Sorry, no pic, but this is a ten minute job.
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Old 02-21-2012, 07:26 PM   #3
 
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Your right JB, I found a few pictures on Zack's previous engine swap threads.

Talked to my middle son (the Honda Mech, also works on Marauders,mine) and he has 7 days off from his job next week and says he will help me find the leak and do the fuel filter mod too.

What a Son.
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Old 02-21-2012, 08:22 PM   #4
 
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?????
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Old 02-21-2012, 11:55 PM   #5
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If you have a valve seat issue or you proved one cylinder has lower compression, there is your low vacuum problem
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Old 02-22-2012, 05:14 AM   #6
 
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OK then.

I was expecting a pulsing indication, as the bad cylinder cycled. But if an exhaust seat is leaking then it's a constant loss to atmosphere thru the tail pipes.

One thing that bothers me, is that I don't ever remember the vacuum reading on my boost guage reading 20 PSI. Therefore, I'm thinking thats not a good place to check engine vacuum.

The only reason a vacuum loss is suspected is the high idle and associated compensation by the IAC valve, which is a recent anomaly.

We will surely find out when Zack gets the car in April.

Pat
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Old 02-22-2012, 06:03 AM   #7
 
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Quote:
Originally Posted by Zack View Post
If you have a valve seat issue or you proved one cylinder has lower compression, there is your low vacuum problem
Ding...Ding...Ding...Ding...
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Old 02-22-2012, 06:07 AM   #8
 
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Quote:
Originally Posted by Silverback View Post
OK then.

I was expecting a pulsing indication, as the bad cylinder cycled. But if an exhaust seat is leaking then it's a constant loss to atmosphere thru the tail pipes.

One thing that bothers me, is that I don't ever remember the vacuum reading on my boost guage reading 20 PSI. Therefore, I'm thinking thats not a good place to check engine vacuum.

The only reason a vacuum loss is suspected is the high idle and associated compensation by the IAC valve, which is a recent anomaly.

We will surely find out when Zack gets the car in April.

Pat
This is just a hypothetical, but what if a faulty wrist pin gouged the cylinder wall? Compression loss would be the same all the time, correct?
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Old 02-22-2012, 08:18 AM   #9
 
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Quote:
Originally Posted by musclemerc View Post
This is just a hypothetical, but what if a faulty wrist pin gouged the cylinder wall? Compression loss would be the same all the time, correct?
I would think so, and wouldn't that mean that the compression/exhaust gasses would be entering the crankcase?

Hypothetically, of course.
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Old 02-22-2012, 09:16 AM   #10
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If there is a valve seat problem and loss of compression, I strongly urge you not to drive the car.

If all of the gas/air is not being burned, you are slowly washing out the cylinder and rings. Once that happens, there is no reversing it.
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