Jump to content

Failed Smog


slicclex
 Share

Recommended Posts

Today I went to get my 91 LS400 smogged so I could re-register the registration. Was informed at the shop that it failed the 15 mph test because of the PCV valve. I told him that was bull*BLEEP* because I replaced the PCV valve a year ago and he told me there was a zip tie around it. I knew what he was talking about but pretty sure this is not a PCV valve.

Here is what we were talking about:

DSC_2012-1.jpg

Are there 2 PCV valves on the LS400?

Link to comment
Share on other sites

Yes I know the PCV valve is on the drivers side where it says "four cam 32V", I've replaced it a couple times myself.

It's too bad they were acting like fools because I have been doing business with them for five years now. Guess they under new management because they all looked like dip**** these days.

Link to comment
Share on other sites

If you haven't found toyodiy.com yet, it's a great site. It looks like that part is called the Intake Air Connector Pipe, PN 17875. At least the whole assembly is. You probably can't get just the part sticking out of the pipe where the two hoses connect to, you'll most likely have to buy the whole assembly.

http://www.toyodiy.com/parts/p_U_1991_LEXU...EPGKA_1703.html

Link to comment
Share on other sites

take it to another smog shop, that guy just went full !Removed! on you

Yes, Jack at the smog shop was giving you some bad info there.

But all the info you're getting so far on the list here is correct.

The PCV valve can be seen to the left of the "32" on the valve cover.

That big Intake Air Connector Pipe (IACP) is indeed one big plastic piece.

The thin (~1/2" OD) black hose that comes forwards and then returns next to it goes down to the infamous idle-up valve on the PS pump.

The thicker black hose running from left to right goes from the IACP to the Idle Speed Control Valve or Idle Air Control Valve.

On my '91, those thin hoses to the PS idle-up valve had become so brittle that one of them cracked and I figured I should replace them both. When I removed the one from that plastic barb sticking out from the IACP, the barb broke off with it. It looks to me that this is what happened to your car as well, and the zip tie sort of holds it in place. It's not a big deal to have a slight crack there - it's just that a slight amount of air will come in that is not filtered or measured. Should have no effect on engine performance.

But I fixed mine anyway - here's how: I bought a segment of straight 1/4" OD (I think) hard brake line at Pep Boys for like $5. Cut a ~1.5" length off one end (it has a slight flare on the end to keep the fitting on). Remove the fitting, keeping the 1.5" end length. Drilled a hole in the IACP where the barb used to be (slightly enlarging the hole that is already there), sizing it so this brake line end is a snug, almost press-fit (the flared end is sticking out). Put the vacuum hose over the new barb, hose clamp it on there, and it's good as new.

If you decide to fix it like this, just so the smog guys can't ding you for it, and you haven't already done it, replacing those vacuum lines with new ones is probably a good idea. I think I used 7/32" ID hose (generic, like $5 for 6 feet of it).

Link to comment
Share on other sites

If you haven't found toyodiy.com yet, it's a great site. It looks like that part is called the Intake Air Connector Pipe, PN 17875. At least the whole assembly is. You probably can't get just the part sticking out of the pipe where the two hoses connect to, you'll most likely have to buy the whole assembly.

http://www.toyodiy.com/parts/p_U_1991_LEXU...EPGKA_1703.html

Oh man, I have been looking for a site that sells OEM parts with diagrams & part names for months! Thank you for this information B)

Link to comment
Share on other sites

take it to another smog shop, that guy just went full !Removed! on you

Yes, Jack at the smog shop was giving you some bad info there.

But all the info you're getting so far on the list here is correct.

The PCV valve can be seen to the left of the "32" on the valve cover.

That big Intake Air Connector Pipe (IACP) is indeed one big plastic piece.

The thin (~1/2" OD) black hose that comes forwards and then returns next to it goes down to the infamous idle-up valve on the PS pump.

The thicker black hose running from left to right goes from the IACP to the Idle Speed Control Valve or Idle Air Control Valve.

On my '91, those thin hoses to the PS idle-up valve had become so brittle that one of them cracked and I figured I should replace them both. When I removed the one from that plastic barb sticking out from the IACP, the barb broke off with it. It looks to me that this is what happened to your car as well, and the zip tie sort of holds it in place. It's not a big deal to have a slight crack there - it's just that a slight amount of air will come in that is not filtered or measured. Should have no effect on engine performance.

But I fixed mine anyway - here's how: I bought a segment of straight 1/4" OD (I think) hard brake line at Pep Boys for like $5. Cut a ~1.5" length off one end (it has a slight flare on the end to keep the fitting on). Remove the fitting, keeping the 1.5" end length. Drilled a hole in the IACP where the barb used to be (slightly enlarging the hole that is already there), sizing it so this brake line end is a snug, almost press-fit (the flared end is sticking out). Put the vacuum hose over the new barb, hose clamp it on there, and it's good as new.

If you decide to fix it like this, just so the smog guys can't ding you for it, and you haven't already done it, replacing those vacuum lines with new ones is probably a good idea. I think I used 7/32" ID hose (generic, like $5 for 6 feet of it).

You nailed it. That's exactly what happened to mine when I was replacing the spark plugs a couple years ago and I've been having to place a zip ties or paper clips to prevent it from leaking.

I like that idea you presented. Don't feel too justified to buy a $250 part where a simple fix for the IACP can be done for less than $20.

Link to comment
Share on other sites

  • 3 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share



×
×
  • Create New...

Forums


News


Membership