Announcement

**svocudd** · 08-26-2002, 02:43 PM

VAM hose

Check to make sure you arent sucking the flexible VAM hose shut, which essentially chokes off the air flow to the engine if that happens.

Cudd

**84turbojoe** · 08-26-2002, 02:55 PM

VAM Hose

Thanks Cudd. Could it suck closed if the wire spring is in there? The spring isn't that great but I think its good enough... I've read about the cambells soup can, so I'll try that and see if it helps. Any other ideas ??

**svocudd** · 08-26-2002, 04:03 PM

VAM Hose

From what I have heard, some people have experienced the hose collapsing. I had it happpen on my 88 5.0 car which had a home made ram air setup but I have never experienced it on my SVO.

Many talk about the spring being weak or missing. I have never heard of the campbell soup can trick.

Cudd

**SVOeric** · 08-26-2002, 04:35 PM

make sure the spring is wound all the way across the hose.. in other words, sometimes the spring gets pushed all the way to one end of the hose...

If you are still running the original fuel pump, that may be your problem.  Since you are running about 39 psi of fuel pressure at idle, (with the hose to the intake disconnected?) I assume you have a adjustable FPR.

Does the engine only do this at certain RPM, or does it always do this at when you hit 12 psi, no matter what RPM you are running?

Are you still running the stock 84 computer ?

**84turbojoe** · 08-26-2002, 05:01 PM

Soup can

Cudd,
the soup can is about the same diameter as the inside of the flex hose and people put it in there to protect against it collapsing. Both ends of the can are removed.

Eric,
Yes, the in tank fuel pump is stock.
Yes, I am using the stock 84 computer, but have a PE to install(yes, PE. Saw one on ebay for $350???).
No, I don't have an adjustable FPR(stock replacement, money went elsewhere on the car).
I've been having problems building boost so that is where my attention has been focused, on the boost gauge. I'll guess that its around 3500-4000 but only when building boost upward toward 12. I'll check the RPM's.
When I pulled the plugs, they looked good,alittle black, but exhaust smells a little rich of all things. EGO is new.
Thanks for the input as always.!!!!

**SVOeric** · 08-26-2002, 05:17 PM

Yea.. I would make that PE swap the VERY next thing.

remember, 84's came with 30 # injectors, You may be dumping so much fuel in at one time, that the engine can't burn it all, basically just choking it. 

The O2 sensor will lean the engine out some, but there is only so much that it can do.  As I understand it, the amount the computer can correct is limited to a range that is programmed into the computer.

If you want to try it with the 84 computer, I would try putting the stock 30# injectors back in, and see if it does the same thing. 
  

 

**svobud** · 08-26-2002, 05:42 PM

if the hose is collapsing...as mentioned...it'll show your kind of problems. I would check that first as well. As mentioned...make sure the wire isn't broken or missing...and has strength left in it.

If you have a loose hose - it'll run rough and quit at idle (so, probably not a loose hose connection). The 35 lb injectors on the 84 computer will cause a rich condition...it'll probably run rough after initial start up...but smooth out later (but still run rich). If you don't want to spend the money on a PE computer - you can use a LA series from a TC. Cheaper...and GT350R has the diagrams online to make the swap easy.

**svono50** · 08-26-2002, 05:45 PM

Joe,

Something nobody else has mentioned, but I think may be part of the overall problem...initial ignition timing. Stock is 10 BTDC, you are at 14. With the bigger turbo, 16 psi, mis-matched injectors/EEC it could be one of your problems. Try turning it down to 10 or maybe even 8 to see it the symptom goes away or holds off till a higher boost. Good luck and let us know what you find.

**SVOeric** · 08-26-2002, 08:09 PM

Here is a new thought...

Vam has a dead spot in it, and is slamming shut.

 

**84turbojoe** · 08-27-2002, 09:15 AM

wow

Hey thanks for all the replies

Bud, fortunately, a PE came with the car when I bought and will be installed today to see if that may help. I initially switched to the 35#'s b/c of the front mount I/C and just haven't gotten in the PE.
svono50, I did have the base idle set at 10*btdc and the car couldn't get out of its own way and boost wouldn't go above 6 psi. It was a dog at low rpm's(w/o boost). So I started playing with the timing and that is where the best results were from driving, but that doesn't mean I won't try to advance it and try.

Eric, is there a way to check to see if the vam is slamming shut. I said I was going to get the car on a dyno for trouble shooting, never could get in touch with the owner, and the car started running better, than this.

I have thought about the VAM taking a crap but would like to trouble shoot first. I have flat run out of money for the car right now (and its my daily driver).
And get this, I found an 86' TC for $200 that runs, inspected and isn't in that bad a shape, but don't have the cash!!!
Thanks for the help!

**svobud** · 08-27-2002, 09:50 AM

do you have an adjustable cam pulley on it? if so, where and how far do you have it adjusted.

**84turbojoe** · 08-27-2002, 11:11 AM

cam pulley

Bud
I do not have adjustable cam pulley (wish I did).
When I had the head off for a gasket, I did the timing alignment as prescribed by the book and was carefull not to move gear at all while removing/reinstalling. But things do happen. What would be the result if it were off by a tooth or two in either direction?

**84turbojoe** · 08-27-2002, 11:18 AM

RPM or Boost

Eric,
You had asked yesterday if was happening during a certain RPM or boost psi. I took notice to rpm's and I can nurse it up to 4700rpm without building boost and all is fine(run out of road).
I can also nurse more boost out of it with a gradule climb to 13-14psi (factory gauge) but than it does its thing. Also, if I jump on it(WOT), it will immediately go into its bucking, popping,fartin' etc.when boost builds.
Thanks again
Joe

**svocudd** · 08-27-2002, 11:52 AM

timing

I would make sure your timing marks are aligned. To me it sounds like your cam/dist/crank timing is wacked. Just a guess.

Cudd

Announcement

Drops dead at 12 psi

Drops dead at 12 psi

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment