tvis problems

[lewy]

i have a 4age in a ke70 which ive had for about 2 months.
the last owner "mitch" said tvis had been removed, the car doesnt run smooth untill it hits about 4000rpm and feels down on power a fair bit.
the cold start isnt connected and a few vaccums have been blocked off.
timing is advanced a fair bit to compensate for the shit down low power but car still splutters and backfires from both the exhaust and the pod filter.
any sugestions of what i can do to get it running normal???
car revs out to 8000rpm now which is above the stock 7450rpm limit isnt it?

http://img146.imageshack.us/img146/8673/dscf0927kv0.th.jpg (http://img146.imageshack.us/my.php?image=dscf0927kv0.jpg)

cold start, and vaccum for air box which i dont think is connected
http://img524.imageshack.us/img524/2531/dscf0928ol2.th.jpg (http://img524.imageshack.us/my.php?image=dscf0928ol2.jpg)

beneath intake manifold near throttle body
http://img146.imageshack.us/img146/1664/dscf0929pb6.th.jpg (http://img146.imageshack.us/my.php?image=dscf0929pb6.jpg)
throttle body vacums
http://img146.imageshack.us/img146/6206/dscf0930pr4.th.jpg (http://img146.imageshack.us/my.php?image=dscf0930pr4.jpg)
anything out of the ordinary?
http://img146.imageshack.us/img146/8473/dscf0931fb4.th.jpg (http://img146.imageshack.us/my.php?image=dscf0931fb4.jpg)

does anything look like it needs to be changed/blocked off/opened up???

car uses alot of petrol at the moment too. like 13L/100kms (my old bigport ae82 used like 8L/100ks)

any help would be great

[Jonny Rochester]

Well if the engine is otherwise standard, would you not expect it to run worse without the T-VIS?

[delta s4]

Have a good look at the vaccume line to the MAP sensor, and make sure its not split or disconected?

[Nikkojoe]

check MAT (manifold air temp sensor - the one with yellow pug in last pic). Take it off, give the probe a clean or unplug it to see if car runs better. If runs the same when cleaned but runs better unplugged, replace sensor.

[parrot]

Put the TVIS back on.

If you have a Jap engine bay loom (not engine loom) reconnect your various idle up valves (photo 2) although they don't affect driveability, just make it more livable at the lights, especially if there is load in the engine. Sitting there with your foot blipping the accelerator gets tiresome. But I presume you don't.

The vacuum tubes from the top of the throttle body, the right hand one goes to the charcoal canister, the left hand one (currently blocked) goes to the small idle up VSV (bottom of photo 2).

Photo 3, looks like you have the waterlines to the waxstat blocked off which will raise your idle as the wax will not melt. Like driving around with the choke on. Also the vacuum feed to the larger of the two idle up valves (the aircon idle up - top of photo 2) is bocked off, but again, unless you wire in an idle up circuit, no point connecting that up.

As far as I can see, the cold start injector looks to be connected at the cold start injector end anyway.

Check your timing and for vacuum leaks, especially at manifolds and also the few vacuum lines still connected. Don't assume that a blocked off vacuum isn't leaking either.

Oh, did I mention, put the TVIS back on!

[lewy]

<div class='quotetop'>QUOTE (parrot @ Jan 7 2008, 10:36 AM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=464456)</div>
Put the TVIS back on.

If you have a Jap engine bay loom (not engine loom) reconnect your various idle up valves (photo 2) although they don't affect driveability, just make it more livable at the lights, especially if there is load in the engine. Sitting there with your foot blipping the accelerator gets tiresome. But I presume you don't.

The vacuum tubes from the top of the throttle body, the right hand one goes to the charcoal canister, the left hand one (currently blocked) goes to the (bottom of photo 2).

Photo 3, looks like you have the waterlines to the waxstat blocked off which will raise your idle as the wax will not melt. Like driving around with the choke on. Also the vacuum feed to the larger of the two idle up valves (the aircon idle up - top of photo 2) is bocked off, but again, unless you wire in an idle up circuit, no point connecting that up.

As far as I can see, the cold start injector looks to be connected at the cold start injector end anyway.

Check your timing and for vacuum leaks, especially at manifolds and also the few vacuum lines still connected. Don't assume that a blocked off vacuum isn't leaking either.

Oh, did I mention, put the TVIS back on![/b]


yeh thanks for the help ill have a look sees at my vacuums for leaks etc. the small idle up VSV you speak of isnt connected to anything at the moment, doesnt this usualy run to the loom? as it has a plug (green) but doesnt seem to connect to anything...is this important?
how hard is putting TVIS back on?
if it were up to me i would have never removed it as i like the sound haha but the previous owner (who ever did the conversion)had it removed.
is it as simple as replacing the TVIS butterfly things or are there several vacuums that need to be reconnected?

does anyone have a vaccum diagram out of a workshop manual or anything??

cheers

[parrot]

As above, if you don't have the loom to plug them into, the VSV's are doing nothing. Connecting them to vacuum is a waste of time. You could create your own idle up circuit but it is a little complicated and I doubt you could be bothered.

TVIS is easy to put back, just make sure you have the vacuum tank and the VSV for the butterflies which bolts onto the bottom of the TVIS plate.

[parrot]

woops, double post.

[AR_AE86]

Check the cam timing, had one a few years ago that was doing the same thing, found it after 6 months of looking, previous owner had changed the cam belt & stuffed up the inlet timing by 1 tooth. also my mr2 had a problem with low power under 4g's crank pully had flocked out & timing was out by 10%.


hope this helps :rant:

[tetsujin]

make sure you have this....
http://www.ae86drivingclub.com.au/dcimages/4/8/4/3/158068.jpg

take off inlet, get new gaskets, add in TVIS UNIT (amke sure it has the canister and shit attached like Parrot said.

Connect hoses and shit up to the correct areas, you do not need all the emmissions crap to run the TVIS either just loop the to hoese coming off the TB and jobs a good one, reall easy to do if you have the tools and about 2 hrs. :0

[lewy]

cheers heaps for the info.
im gonna check the cam timing first, as it is the easiest solution if it is the problem, then proceed to re-install TVIS.
il let you guys know if i have any problems.
thanks again!

also if anyone has a TVIS butterfly thing (not sure what theyre called) they are selling i would be interested in buying it.
thanks again

[Nikkojoe]

I got the whole complete unit (same as fwd bigport), but I want to gut it when I go turbo.

[parrot]

Yes you can use the AE82 twin cam TVIS plate. But make sure you get one off an early 3 rib bigport, not a late 7 rib bigport (i.e. import Jap motor) as the loom plug won't fit the TVIS VSV - different shape.

[Nikkojoe]

Yep, early bigport (ae82 blue top spec, same as the jdm rwd manifold i put in - didn't use it as it was stuck to the manifold from never being taken off). Has the square blue plug from memory...

[parrot]

Yep. Early will be square, late is oval.

[lewy]

<div class='quotetop'>QUOTE (parrot @ Jan 8 2008, 11:15 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=465329)</div>
Yep. Early will be square, late is oval.[/b]

ill be on the look out for a fwd ae82 TVIS plate then.
cheers for the info
would it be a good idea if i match all the vacuums the same as bigport seca?? would that be the easiest way to make sure everything is connected right>?

also one of my vaccum lines was leaking to the map senser black box thing which i replaced, goes a bit better now, slightly more responsive down low.

[parrot]

<div class='quotetop'>QUOTE (lewy @ Jan 9 2008, 12:21 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=465509)</div>
<div class='quotetop'>QUOTE (parrot @ Jan 8 2008, 11:15 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=465329)
Yep. Early will be square, late is oval.[/b]

ill be on the look out for a fwd ae82 TVIS plate then.
cheers for the info
would it be a good idea if i match all the vacuums the same as bigport seca?? would that be the easiest way to make sure everything is connected right>?

also one of my vaccum lines was leaking to the map senser black box thing which i replaced, goes a bit better now, slightly more responsive down low.
[/b][/quote]

All you will need to connect will be the TVIS vacuums, which would be identical on either car, the MAP sensor vacuum, the fuel pressure regulator vacuum, and the TB to the charcoal canister which it looks like you already have correct. I would connect waterlines to your waxstat too, but not essential. Some people remove the waxstat but I am not recommending that.

Your idle up VSV's are a waste of time without an idle up circuit to plug them into.

[lewy]

ill source a tvis plate then see how i go.
cheers mate

<div class='quotetop'>QUOTE (parrot @ Jan 9 2008, 12:29 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=465513)</div>
<div class='quotetop'>QUOTE (lewy @ Jan 9 2008, 12:21 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=465509)
<div class='quotetop'>QUOTE (parrot @ Jan 8 2008, 11:15 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=465329)
Yep. Early will be square, late is oval.[/b]

ill be on the look out for a fwd ae82 TVIS plate then.
cheers for the info
would it be a good idea if i match all the vacuums the same as bigport seca?? would that be the easiest way to make sure everything is connected right>?

also one of my vaccum lines was leaking to the map senser black box thing which i replaced, goes a bit better now, slightly more responsive down low.
[/b][/quote]

All you will need to connect will be the TVIS vacuums, which would be identical on either car, the MAP sensor vacuum, the fuel pressure regulator vacuum, and the TB to the charcoal canister which it looks like you already have correct. I would connect waterlines to your waxstat too, but not essential. Some people remove the waxstat but I am not recommending that.

Your idle up VSV's are a waste of time without an idle up circuit to plug them into.
[/b][/quote]