48 replies to this topic

[boxpin]

I had polished the FMIC pipes. When installed they were all tight...really. But not tight enough. When I began to pressurized the line I could hear leaks. I got a squirt bottle and put soapy water in it and sprayed everywhere. One by one I tightened the clamps down till there were not more bleeding bubbles. When done I was able to pressurized the line to around 25psi and it held the pressure. Before I started it would pressure up to 20 then fade down, blow it up then fade down. Now it holds. I pinched the IAC hose to do this. After it was done and all connected again I pressurized it again from turbo side to see what else I could find. Turned out the vacuum tree was leaking, replaced the seal on that. The IAC short hose was bubbling, ordered a Snabb. I have one more line to replace, the brake booster vacuum hose then I think I have it. Its funny the things you think are fine really are not, they have to be checked.

[lookforjoe]

^ Excellent. Yes, appearances can be deceiving. Covering all the basics when trouble shooting often gets put aside as we get caught up in what we think must be the cause! Good bit of Internet diagnosis on Fishey's part!

[vmaxx]

thanks for the clarity, cured a little bit of my issue.

[GV70T5m]

Could you post pics of your testing set up? I need to get after what I suspect are more than one boost leak that is creeping back. I fixed several and did a ignition tune up to pass smog last summer, but it's (my missfire) started again.
If you don't have pix, maybe I could stop by Sunday on my way to Nevada City. ?

[boxpin]

Very simple.

Parts:
1. Two ABS caps from HomeDepot (get the right size for your plumbing)
2. One Valve stem from Americas Tire

Drilled a hole in one of the caps and inserted the valve stem
Disconnected the line from the throttle body and inserted the cap with the valve stem
Disconnected the line from the turbo and inserted the other cap
Pinched off the IAC line with a pair of needle nose vise grips
Used a tire filler with a pressure gauge.

Here are the parts.

[vmaxx]

This should help

[volvos70turbo99]

hey boxpin when your car was misfiring under high boost, did you feel a vibration too as it was misfiring, thats what i feel.

[boxpin]

When the rpms are really high you could tell it just was not smooth and not quite as powerful. The feeling that something is not right and it should have a bit more power.

[Fishey]

volvos70turbo99, on 20 January 2012 - 12:19 AM, said:

hey boxpin when your car was misfiring under high boost, did you feel a vibration too as it was misfiring, thats what i feel.

You are getting a vibration when the car starts to make power under boost. Just going from experience here but check your CV joints specifically the inner on the passanger side. When it fails you get a vibration under boost or more so actually when you start to make power much as you barely discribed. I replace mine about every 2 months on my Volvo as they just don't hold up.Then again I run cheap axles because they are free to replace. I think I am on like number 16 and take about 2min to replace.. so whatever.

Edited by Fishey, 21 January 2012 - 06:47 PM.