1987 automatic found a vacuum leak
02-24-2016, 03:03 PM
#1
Rennlist Member
Thread Starter
1987 automatic found a vacuum leak
I am in the middle of the intake refresh. I have tested the vacuum lines and have found one leak. It is the line from the 5way that heads back along the bellhousing. I am assuming that this is to the auto trans. I searched online but haven't found a clear solution or description of where the leak may be.
Ideas?
thanks
John
Ideas?
thanks
John
02-24-2016, 03:11 PM
#2
Rennlist Member
John,
You really need to trace the line back to the vacuum modulator connection. The most likely place for a leak would be at the modulator if that connection has come undone. The other possibility would be if the line has been breached somehow.
If that line does not hold vacuum then presumably you will have been experiencing rapid but harsh shifting- correct?
Rgds
Fred
You really need to trace the line back to the vacuum modulator connection. The most likely place for a leak would be at the modulator if that connection has come undone. The other possibility would be if the line has been breached somehow.
If that line does not hold vacuum then presumably you will have been experiencing rapid but harsh shifting- correct?
Rgds
Fred
02-24-2016, 03:41 PM
#3
Rennlist Member
During my refresh last summer, that's the one vacuum hose on my car that was toast. It was cracked about 6 inches down the firewall from where the 5-port connector is. In hindsight, I think it was because it got hard and crunchy over the years and then I was moving it around during disassembly/reassembly. Fortunately, I was replacing all hoses with a kit from Roger. Yours might be in a completely different place, but that's where mine was.
Just a shower thought, I wonder if a person could get new hose, tape it end-to-end to the existing hose and then use the old hose to pull the new hose into place. I.e. a pull cord. If it worked, it would be much easier than removing exhaust, heat shields, etc.
Good luck!
Just a shower thought, I wonder if a person could get new hose, tape it end-to-end to the existing hose and then use the old hose to pull the new hose into place. I.e. a pull cord. If it worked, it would be much easier than removing exhaust, heat shields, etc.
Good luck!
02-24-2016, 04:45 PM
#4
Rennlist Member
Thread Starter
Shifting has been perfect since I bought the car three years ago. No issues at all.
That is a great idea. Do you think it would actually work, or are there enough twists, turns and clamps to hinder pulling it through?
Just a shower thought, I wonder if a person could get new hose, tape it end-to-end to the existing hose and then use the old hose to pull the new hose into place. I.e. a pull cord. If it worked, it would be much easier than removing exhaust, heat shields, etc.
02-24-2016, 07:09 PM
#5
Rennlist Member
The flexible vacuum line connects to a hard line on top of the torque tube not far from the bell housing. My recommendation is to buy a long enough piece of vacuum line that you can lower the end from the top to where you need it to connect. Move the hardline vacuum line off to the side of the torque tube and install the new flexible vacuum line. Pull the excess upwards and cut the excess off as you reconnect the flexible line to the 5 way.