Help!! falls on face at 10psi

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Help!! falls on face at 10psi

February 18, 2007, 06:53:27 PM

I have an 86 cougar xr7 turbo with an automatic. I had a problem with it not starting. after swapping tfi and coil I found that i had a broken wire leading to the coil. After i got that taken care of I added a BOV. I was going to hook up the fmic that i mounted but didnt have enough pipe. So i get it together and take it for a spin and it gets to about 10 psi and falls on its face and stops pulling and engine rpms dont climb it justs stays at about 3000 rpm. If i slowly roll into the throttle it will go all the way to 5000 rpm if it doesnt build boost. I pluged off the line to the waste gate and disconnected the bcs i need help please:punchballs:

Help!! falls on face at 10psi

Reply #1 – February 18, 2007, 08:21:28 PM

Your BOV may be opening under boost....

Help!! falls on face at 10psi

Reply #2 – February 18, 2007, 08:31:36 PM

I thought about that but i dont think so! cause when i let off you can hear a whoosh . I talked to my buddy and he siad maybe the vam or the fuel pressure regulator went bad! I need some more ideas

Help!! falls on face at 10psi

Reply #3 – February 18, 2007, 08:34:53 PM

Well of course it's going to "whoosh" if it's releasing 10# of pressure...

What do you mean you "plugged off the line the waste gate"?

Help!! falls on face at 10psi

Reply #4 – February 18, 2007, 08:52:35 PM

i thought maybe the waste gate was opening to soon or something so disconnected it and plugged the line. I also removed thye lines to the bcs and plugged them too.

Help!! falls on face at 10psi

Reply #5 – February 18, 2007, 08:56:20 PM

Well that was silly.....if the WGA is not hooked up all it will do is not regulate boost...

How about checking the BOV....is there any adjustment to it?

Help!! falls on face at 10psi

Reply #6 – February 18, 2007, 09:03:12 PM

i adjusted it in and out. If the wastegate is not hooked up the turbo should make max boost correct?

Help!! falls on face at 10psi

Reply #7 – February 18, 2007, 09:09:46 PM

It will make nothing but boost until something gives.

Take the BOV off and get things running properly first.

You could have a VAM issue....could be dirty, sticking, etc.

The turbo inlet hose could be sucking closed under boost.

Help!! falls on face at 10psi

Reply #8 – February 18, 2007, 09:39:31 PM

Can you clean the VAM and how do you do it.?

Help!! falls on face at 10psi

Reply #9 – February 18, 2007, 09:50:47 PM

Quote from: turbo86xr7;130285

Can you clean the VAM and how do you do it.?

ive always used brake cleaner to clean the vam out

Like chuck said remove the bov and see what it does.Also do not trust the stock gauge (if equipped) mine was 7-8 psi off at 10 psi .

Help!! falls on face at 10psi

Reply #10 – February 18, 2007, 10:01:04 PM

even if the gauge was wrong it still doesnt explain why it falls on its face and engine wont rev and stays at 3000 rpm under booost at full throtle

Help!! falls on face at 10psi

Reply #11 – February 18, 2007, 10:14:36 PM

Quote from: turbo86xr7;130288

even if the gauge was wrong it still doesnt explain why it falls on its face and engine wont rev and stays at 3000 rpm under booost at full throtle

Actually it possibly could if you are making 30+ psi and your gauge shows 10.

Do you have access to a code reader? maybe a trip to your local autozone and let them scan the codes. The problem you are having has so many variables to the cause.And even though fords diagnostics are poor it may give you a clue.

(My latest episode was a bad vam that caused a bad stumble/pop/pop underboost no rpm gain issue)but ive seen CTS/TPS/VAM/BAP/O2 cause the same issues

Help!! falls on face at 10psi

Reply #12 – February 18, 2007, 10:15:39 PM

Well you've been given a couple things to look at.

Last one...first plug the WGA back up. At the very least run a hose from the turbo compressor housing to the WGA. Unplug the knock sensor. It's possible the KS is pulling timing as well..thus making it feel like it falls on its face. DO NOT DO THIS UNLESS YOU RECONNECT THE WASTEGATE.

Other than that check the things that have already been pointed out and get it running right without the BOV first.

Help!! falls on face at 10psi

Reply #13 – February 18, 2007, 10:21:41 PM

i have a autometer boost gauge hooked up. It just starts to pull under boost and then falls down. I dont see how timing would do that. it should still rev past 3000 rpm. Without getting into the boost it will erv way past 3000:punchballs:

Help!! falls on face at 10psi

Reply #14 – February 18, 2007, 10:27:57 PM

The knock sensor will pull timing and the car will miss and fall down if it's excessive enough. It will ease into it and be fine if you don't get into boost.

Since you obviously don't want to listen to any advice, I'm done...I have other things to do.....