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01 L67 in 97 GTP Chassis - Need Vacuum line help

Tea Time

Tea Time

New member
i have a 01 L67 in my 97 gtp....now , heres the problem. This car was someone elses project :th_shakinghead2: and i now own it ...there is supposedly a 01 engine n Tranny in the car.
the blower on the car is from a 97 as it has the black metal piece (has 2 male pieces on it for vacuum hoses) comin out of the blower by the BBV .none of the vacuum system is hooked up so im starting from scratch here...i've figured out that the 97 GTP has the 'evap canister purge valve' and 'evap vacuum switch' mounted on the back of the engine...i do not have these pieces as they didn't come with the car. so i've been looking up vacuum diagrams for the 97 L67 online and there are 2 different ones that i have found but need verification as to which diagram is right

This link shows a diagram an if u notice, it shows a vacuum line going to the trans....i didnt think the 97 gtp was a vacuum operated trans :th_nervous: not to mention that there are only 2 fittings where the diagram shows that the line to the tranny would go.

GTP :: 1997 gtp L67 vacuum diagram picture by ArkanzanWheeler - Photobucket

Now this diagram was posted on GPF not long ago for a 97 GTP but does not show a vacuum line to the tranny. (u may have to scroll down the thread for the diagram....sry)

http://www.grandprixforums.net/1997-gtp-issues-help-43820.html

which diagram should i be following?
 


You can follow either of the two routing systems.

In 97 the tree by the TB fed the boost control soleniod and the fuel pressure regulator.

In 98+ the tree was not there. So a T came off the LIM to the FPR and BCS. Making the vacuum a basic horseshoe.
 
So the first diagram wouldn't be correct at all then, right?....there should not be a vacuum line off that tree to the tranny at all then eh?
 
The first diagram IMO is totally whacked because it says 97 GTP. All 97 GTP's should (key word as 97 might have had one or two 4T60's) have only had a 4T65 trans in the GTP or Supercharged model. The 4T65 trans is fully electronic and doesn't need vacuum for anything. The 4T60 aka predecessor trans used vacuum.

so no.. no vacuum to the trans.
 
i was pretty sure the first diagram i posted was wrong but the ppl on this site really know their stuff....thot id ask to be safe.

any idea if i need to use the 97 blower (with the tree on it) in the 97 gtp chassis or if the blower off the 01 will work?...what im trying to say is if i run my vacuum lines on my 97 like my 00 gtp is set up, will it work or do i need that tree and and follow diagram #2?
 
You can use either blower and either vacuum setup.

If you use the 97 blower and want to use the 00 vacuum you simply cap those tree ports. Or you can hook it up like the second diagram.

If you use the 00 blower then you use the horseshoe vac line setup.

It's really up to you. Personally I like the 00 vac line setup better because GM made each nipple a different size from the other end and that's a pain to connect new lines to at times.
 


ok....so i can use either vacuum setup...sweet (makes it easier to run the vacuum lines when my 97 n 00 r side by side)

I appreciate all the help too Bill...

Now what about throttle bodies? can i use the 98+ or must it be the 97 tb?
and is the wiring harness in my 97 gtp different than my 00 gtp?...is it a plug and play system to drop a 98+ engine n tranny in the 97 chassis or does the 97 chassis have more electrical components to operate the engine properly?
 
I would say run the 00 TB. It has a better amount of air gobbling abilities and the maf tables aren't much different from 97-00. Ideally you'd have someone with a DHP put the table into your pcm. But you'll never notice the different otherwise.
 
ok, Thanks...i think i may just run the vacuum lines as a 97 would run and keep the blower with the tree since i cant change pcm's and i dont have a tuner to change for the 98+ tb.

so will a 98 - 02 airbox just bolt into my 97 gtp chassis?...i already moved the coolant bottle to the slim design on the pass side strut tower but will the 97 pcm fit into the 98+ airbox? i would like to have my 97 almost similar to my '00 under the hood and it almost looks as if the 97 would have poor airflow cuz of the 90* angles .
 


I'm also using a 97 blower on my Impala but only making 3lbs of boost. I disconnected the BBV from the BCS and now am making 7lbs of boost and 10 at shifts but KR is at 4-7*. Does this mean I have a bad BCS?
 
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