IACV problem?

[kriskop]

Hi guys - firstly, a BIG thanks to Ian C for your very helpful info regarding the sequential turbo system. Needless to say, I have big problem ! Symptoms - No 1 spools up, but not to "peak" - power delivery is smooth but sluggish. Boost reaches 0.00 on EBC, & doesn't go any further. 2nd doesn't spool up at all. Haven't "pushed" it beyond 2.5 - 3k revs in case I do some damage (although it struggles beyond this point anyway !) When running correctly, there's a loud audible "rush" from dump valve - This is obviously not working (no sound) With ref to Ian's info, these symptoms sound like the IACV may be "stuck" open (?) I've checked the vac. hoses where possible - all seem ok & in good condition (only done 40k miles by the way) Can IACV be checked ? Any advice would be most appreciated. Also, if I cannot solve problem, anyone know nearest expert in this field where I could take it ? (Cheshire area) but dont mind travelling if have to. Muchas grateful !

[Chris and Alana]

If you have a multimeter you can remove the vsv's and test them to see if they work. The IACV is very easy to get to aswell. Here'a a link to to a page of how to test them, its quite simple to do.

http://www.max-boost.co.uk/max-boost/supra/turbo.htm

Scroll right to the bottom of the page and under 'Here is Mr T's way to test the VSVs' just click on the links labelled EBV EGCV IACV and WGV. Hope that helps

 

And just incase you didnt know here's a link back to Ian's guide http://www.mkivsupra.net/vbb/showthread.php?t=35926 and the first pic (no7) shows the location of the IACV

[kriskop]

Thanks v. much for the info C & A - very helpful. When time, will av a go - when I can get hold of a multimeter. Who am I kiddin - only wish time was the issue ! - the VSV's are just about visible with me specs on, but not sure if I can reach em !! - mind of a kid - body of an old fart! (Put it this way - took the grand kids to Stockley Farm & gained entry as a senior citizen, without question ! - saved a quid towards my 60th!!) Would still appreciate name of nearest soop specialist in this field (Cheshire area) ta v much….cheers

[kriskop]

Have managed to remove all 4 VSV's - trying to get hold of multimeter to test

[JohnA]

...Scroll right to the bottom of the page and under 'Here is Mr T's way to test the VSVs' just click on the links labelled EBV EGCV IACV and WGV. ...

 

 

Mr T is no fool:d

[kriskop]

If this identifies the problem - MR T becomes MR HERO !! (the beers'll be on me !!)

[Chris and Alana]

(the beers'll be on me !!)

 

Sounds abit like John Smith blended with a bit of the milky bar kid there.

 

Anyway, after the bad comment. . . . Mr T's advice helped me sort a problem I had with the second turbo coming on intermitantly and after testing the vsv's it turned out my wategate vsv was gooshed. £33 later and an hour of my time and bingo, problem sorted It could have been an expensive fix at a garge to diagnose and replace the vsv with a new one. So Mr T's advice should work for you also.

 

Good Luck

[kriskop]

Good on ya ! - Ta for that. Have sent for a multimeter. Just hopin & prayin its not a busted turbo !!

[kriskop]

Multimeter arrived - checked out all VSV's - all ok & replaced. Scratcin head...last resort...Double checked all hoses & Lo & Behold - Jesus, Mary & Joseph I always knew there was A GOD !! Found that the large rubber hose which connects to hard pipe with jubilee clip which runs from E.T.C.S. manifold (blow off valve is attached to this) & runs behind radiator had popped off. Didn't notice this initially cos its very hard to see......reconnected.....BINGO!! I am now like a dog wi 2 dicks...cheers & thanks to all.