Hi,

My 1991 LC drives, but it absolutely lacks power to accelerate. It seems it doesn't rev up over 2000 rmp when in drive (no problem to rev in neutral).

I replaced fuel filter, spark plugs & cables, checked compression. Now down to the feared vacuum system - guess what: most hoses don't show ANY vacuum at all!

Now - these vacuum tubes seem to run virtually everywhere throughout this engine - and I have no clue how to even start diagnosing. To start with: I don't even understand where the vacuum is created/generated. So: HELP!

I do have the Haynes and max ellery's manuals - but they do not try to give me the needed guidance. I can't even find the VSV valves and I have no clue how to replace the EGR valve. I searched this forum, but didn't find relevant matches.

My 1st question is: what is the likelyhood the vacuum system is cause for my lousy performance? (don't want to spend loads of time and money with only result a cleaner exhaust, but no extra power).

2nd: where can I find info on how to diagnose the vacuum system - preferably for the LC of course. (or is it better, easier to have this done by a car shop?)

Any help from experience is very much appreciated!

Thanks!!!

You can get a factory service manual online for $10; download away;

http://techinfo.toyota.com

I know they have them for most Toys; don't see why they wouldn't have the Cruisers listed as well.

Thanks for your reply, kewlynx. Interesting site - but it didn't indicate there was info on the vacuum system (a lot on electrical -but as a Bs in EE, I can manage my way in that area).

I noticed a fair number of "readers" on this subject, but not many pointers to help here.

I found this link via some googling: Vacuum 101 (or...Your Engine Sucks)- I think it may be useful for many here:
http://www.ih8mud.com/tech/vacuum.php

My first challenge is to get vacuum readings at all :-)

Hi All,

I found the vacuum diagram for the 3E-F engine - others can be found also!
http://www.autozone.com/servlet/UiB...900823d/80/16/11/88/0900823d80161188.jsp

I never knew autozone had all this info on their site - but I think it is great! Check it out!

furthermore, birfield.com has interesting info on LC's.