secondary removal how do you go......

[bradslt5]

about it . could someone who has donerthis give me the proceedure for rmoving them. and what does one have to keep connected vaccume wise ? does the prom need to be reburned ? and who does this ? also where can one get the accel injectors ? and what part numbers . thanx in advance for any help

[Paul Workman]

Originally Posted by bradslt5

about it . could someone who has donerthis give me the proceedure for rmoving them. and what does one have to keep connected vaccume wise ? does the prom need to be reburned ? and who does this ? also where can one get the accel injectors ? and what part numbers . thanx in advance for any help

I'm strongly considering removing them as well; "parts left out never break", is the way I look at it.

Pete has removed his and likes the results just fine. And, I spoke w/ Marc Haibeck about it and as it happens he has a chip profile to accomodate the modification, and is experimenting with a new table which (to me) appears to actually boost the low-mid torque a smidgen as well as adding about 5 ponies to the top end.

So, I wonder if the mod adversely affects emmissions?? If not, then it really seems to be a "no brainer" to pull them and install Marc's chip.

P.

[Pete]

You will need to keep the electric secondary solonoid,vacuum pump and
differantial MAP(under ECM early) (under plenum later).

You will need to run from the Differantial MAP to the open port of the solonoid the vacuum pump to the closed port of the solonoid.


Make sure you yank everything else shafts included use Dorman freez-plug #555-108 or equal local part store.

Make sure you have Full Power ON when you go for a test drive.
Enjoy.

This is what i can remember off the top of my head,age is catching up to my memory.

If you need more info just post.
Pete

[tpepmeie]

Or you could reprogram the PROM to avoid all the secondary vacuum checks....

Pete, did you get the other info I sent the other day?

Todd

[Pete]

Originally Posted by tpepmeie

Or you could reprogram the PROM to avoid all the secondary vacuum checks....

Pete, did you get the other info I sent the other day?

Todd

What Todd said reprograming the chip.

Yes,got it Todd thanks.

Pete

[XfireZ51]

Originally Posted by Pete

What Todd said reprograming the chip.

Yes,got it Todd thanks.

Pete

Does that mean unchecking the MALF flags for PRT 56 and PRT 61? I'm interested in knowing since I'll be pulling plenum in the near future and thinking about removing SCDYs.

[XfireZ51]

While we're on the topic of secondary PT removal, Lgaff and myself discussed the idea of just removing the throttle plates and leaving the rest of the linkage in. ECM still thinks secondaries are in. Everything works except no throttle blades in the way. And since we haven't determined yet how to bypass a MALF for SCDY PT, this seemed like a reasonable way to go. Any comments?

[XfireZ51]

Originally Posted by XfireZ51

While we're on the topic of secondary PT removal, Lgaff and myself discussed the idea of just removing the throttle plates and leaving the rest of the linkage in. ECM still thinks secondaries are in. Everything works except no throttle blades in the way. And since we haven't determined yet how to bypass a MALF for SCDY PT, this seemed like a reasonable way to go. Any comments?

Anything further on "reprogramming the chip" if secondaries aren't used? What happens to use of PT Throttle Open VE and SA tables if the parameters for using secondaries is set high in order to avoid setting a code?
Any comments on simply removing the butterflies and leaving everything else intact?

[Maxlean]

Originally Posted by XfireZ51

Anything further on "reprogramming the chip" if secondaries aren't used? What happens to use of PT Throttle Open VE and SA tables if the parameters for using secondaries is set high in order to avoid setting a code?
Any comments on simply removing the butterflies and leaving everything else intact?

That's what we did. Kept the solenoid, pump, and diff map but took out the butterflys and shafts. Then in the prom, I duplicated the pt open sa and ve tables to the closed pt sa and ve tables. Works like a charm. The ecm thinks it's switching the secondaries, and using the different tables, but in reality is just using the pt open tables at all times. BTW, just setting the pt open point to be some really low value (as our chip was delivered) is not a good idea as since the ecm thinks it's in pt open mode it only uses 3 of the 19 ft cells. This can have a real impact on driveabilty (especially if your ve tables aren't perfect). Doing it the way I suggest allows the ecm to use all ft cells under normal driving as it thinks the pt's are closed.
Scott

[tpepmeie]

Originally Posted by Maxlean

BTW, just setting the pt open point to be some really low value (as our chip was delivered) is not a good idea as since the ecm thinks it's in pt open mode it only uses 3 of the 19 ft cells.Scott

There is nothing in the program to limit block learn cells when the port throttles are open. Whether PT open or not should have not effect on the block learn function.

Open port throttles does not mean power enrichment is active.

Todd