Alrighty fellas, here is one to wrap your brains around... Ive got a '92 RS that came with the 305 that we all know and hate. sadly(happily) It finally died and forced me(allowed me) to replace it. due to budget constraints I couldnt go with a full on LS swap, all though I would have liked to. so I bought one of these:

http://www.jegs.com/p/Chevrolet-Perf...32025/10002/-1

seemed to be the best bang for my buck...

after getting all the appropriate parts, intake manifold, larger throttle body, bigger injectors, bigger fuel pump, 350 knock sensor and ESC module; I went ahead and also got a few "go faster" parts like aluminum pulleys and water pump, 1.6 ratio full roller rockers and MSD distributor and 6AL-2 box.

obviously all of this was going to need a custom Prom made for it to behave so I found a place, Sinister Performance LLC to make the new chip for me.
they have been really helpful and happy to give advice and suggestions as well as instructions as to what they need from YOU to make a new PROM chip.

now here comes the issues, first off, the ECU insists on running like 30* timing advance at idle (I have already gone throught the appropriate procedure for setting the base timing). which brings up another issue, when I have the base timing set to TDC like its supposed to be, the thing runs like a pig, spits sputters and shoots flames out the intake, not exactly desirable. So to get the thing to run decent the Base timing has to be set to around 10* advance, but no matter what, In park, at idle, it runs it forward to 30+* advance. Furthermore, the thing wont idle at less that 1100 RPM. According to the guys at Sinister, they programed a 750 rpm idle speed.

Occasionally the Rpms will drop that low briefly but when they are down there, it misfires like crazy, shaking the whole car. Ive got a feeling that because I have to have the base timing set so advanced it wont allow the engine to run properly at that low of RPMs.


So, any and all Ideas will be appreciated as to what to check into or what you think might be the cause for my symptoms I will try and provide any further information if you have any questions. And again, in summary my issues are these:

High Idle, wont run smoothly at less than 1100 rpms
Very advanced Idle timing, the ECU commands the timing to run 30* at idle
Advanced Base timing, The base timing must be set to around 10* advance for the engine to operate in a useable fashion

sinister performance claims that it isnt their tune that is making the timing be so advanced. I have no way to check this claim so I have to trust that they are correct.

yes its cheesy but here is a link to the facebook album dedicated to the progress. just so yall can see what all has been going on...


https://www.facebook.com/media/set/?...1&l=23a56f2305

 

Your running the stock TBI intake and injection right? If so, you need the following to make the car run properly: You need
350 injectors
350 specific knock sensor
350 ESC module
350 chip
Look at this link https://www.thirdgen.org/forums/tbi/...-350-swap.html

 

You need the L05 chip aka "the cop car chip" ANLU broadcast code.

 

You should be looking for parts from an L05 motor. This is a 350 TBI motor that came in 89' B-cars like the Police Caprice or a 350 TBI truck.

 

yep got the injectors the knock sensor and the ESC module im having the chip custom made.

 

added a link at the bottom of the original post with pictures of the build... so yall can get an idea about things

 

When you set timing did you disconnect the EST plug?

 

yep. read all about the correct procedure before I messed with it.

 

Maybe the balancer is not installed correctly? I would verifty. I idle at 20dA with the EST connected. I have never heard of 30dSA for idle. Eitheer the .bin is asking for that SA or the balancer is way off.

 

the balancer came on the long block from the factory, aren't they keyed to the crank? I never bothered to look into it but I presumed they only fit one way...

 

Maybe balancer slipped internally throwing off the timing marker. Actually that is unlikely.

I wonder what the "tuner" has the timing set at for RPM/MAP SA cell? I cant believe 30 deg SA is anywhere near stock. I have a stock LO3 bin at home. I should look at it. Maybe someone will state what GM uses for idle Sa.