2000 Tran Zam

iTrader: (2)

I just sent my pcm back to Allan to unlock since its obvious Im not making the power out here that I was there.

So I get the pcm back, start the car and start driving it around.

At first it was surging a bit, but I think it was from the battery not being connected for 2 weeks.

Anyways, I notice when I should normally be in boost(I can feel the car pull a little), its still in vacuum and not creating any positive displacement.

It happens in the first few gears, then 3rd/4th it will create a little bit positive pressure, but nothing more then like 2/3 psi.

When I undid my pcm, is it possible that I could have pulled a vacuum line or something, or could it be maybe he changed something in the tune and not just unlocked it?

Boostaholic

iTrader: (4)

It sounds like its set to be 1-bar map sensor, which reads up to about 1.5psi when I had mine hooked up.

Where is your map sensor connected to the intake manifold? The stock location? Also is it plugged in?

Also, is the vac changing as you drive around?

2000 Tran Zam

iTrader: (2)

ya, vac changes as I drive, but ive got a 3 bar SD tune on it, so i doubt it only reads to 1.5 psi.

Boostaholic

iTrader: (4)

Well, for example in BigStuff3 even if my tune is setup for a 3-bar map if I configure BS to read a 1-bar it won't show any boost and run really lean if I do get into boost.

I dont know how the stock PCM works with 3 bar tunes though, so I may be totally off.

smokinHawk

iTrader: (48)

have you checked all the IC connections to make sure nothing has poped off, as you siad its not pulling like it did?

Boostaholic

iTrader: (4)

Also, i guess I didn't read your topic very well are you seeing this in a data logger or on a physical gauge?

2000 Tran Zam

iTrader: (2)

i was looking at my eboost gauge.

Smokin, i havent looked at the IC piping yet, as I figured that since no changes were made and the car wasnt driven hard at all since the PCM has been put back on.

i'll take a look in a couple hours when I get off work.

DeltaT

iTrader: (5)

Just to doublecheck - you have a 3-Bar TUNE on it but are you sure the MAP sensor has been changed to a 3-Bar MAP? The actual sensor is usually a different color than stock, and the keying on the connector is different and would have been replaced.

Like Boostaholic said, the symptoms match pretty well.

Jim

Boostaholic

iTrader: (4)

Its a physical gauge not connected to the PCM at all from what I understand.

fletchls1

iTrader: (10)

Easy thing to check is to make sure there arent any kinks in your line running to the gauge.(you say you felt it pull but your gauge didnt read boost)

2000 Tran Zam

iTrader: (2)

Ya, ill have to figure out where all the lines are.

Its just wierd that I only noticed this change after I got the pcm back, nothing else has been changed.

I guess it doesnt mean that something could have happened once I started the car up or something.

2000 Tran Zam

iTrader: (2)

Ya, i dont know how the eboost gauge is hooke up, but i would assume its got obviously a positive and negative to give it power, then at least a line running to some sort of pressure line, unless they have a connection in the pcm that reads manifold pressure?

Scalpel

iTrader: (4)

You could have pulled a vacuum line loose when removing the PCM. Check all your lines in that area to make sure they finalize appropriately.

Scalpel

iTrader: (4)

PS, have you perused the e-boost manual to see if it had any ideas that could correlate to your problem?

daryl2cb@yahoo.com

iTrader: (2)

I wonder if the line (vac) runs under the pcm into the firewall plug behind the passenger kick panel, you might have pinched it under the pcm when re installing the retuned one.

MECHAM

iTrader: (4)

the eboost guage has a vacuum line running to it from the manifold (brake booster).

then the solenoid (electrical) has 3 ports .. and there are two ways to hook it up.

see my attachments on how mine is hooked up...

https://ls1tech.com/forums//showthread.php?t=493093

2000 Tran Zam

iTrader: (2)

Well, I was driving it back home(i checked to make sure all lines were ok and no clamps/hoses came off) and it was still a little low on pressure in the first couple gears, but I got on it in 3rd and it went up to 10psi, so im thinking it might have something to do with the change in weather? (around mid 80's or so).

Im gonna have my pcm scanned hopefully this weekend, cant get on the dyno till the tuner has a chance.

Scalpel

iTrader: (4)

So what is the main problem going on, your boost readings?
Does the car still feel as fast it was? What are you using to gauge to compare how fast it was prior to leaving Futral and you receiving it?

I'm lost.

2000 Tran Zam

iTrader: (2)

ya, in the lower gears it doesnt look like its reading as much psi under load.

What i noticed too is before I sent out the pcm, when i would be in boost the psi would increase by whole numbers till it got to the top. Now when it does it, it goes to fractions of psi. I dont know if its a big deal, but I just want to put it out there just in case.

Im thinking it should be fine, I just wont get into boost until the tuner has a chance to take a look at it.

Tiago

iTrader: (27)

weather makes a hell of a difference.