ok, i have finaly got my 82Z converted to TPI and have it running, the idel seams to be high in park and iradic and when i atempt to put the car in gear it just stalls, the tpi is off of an 88 iroc 305 5 spd standerd, and is now home on my 350, i have the BBK AFPR and presure at 60 psi to compensate for the 305 injectors, the knock and esc from an 86 vette and other mods, such as a stage 2 shift kit in my tranny. i think that this stalling prob and iradic high idel could be because i may need to adjust my iac and my tps sensor. but i think i am getting a lil deep hear. the under dash mount diagnosis term that is in my car was desinged for a 5.0 carb engine, and now with the 350 tpi i am woried that the pinouts are not hooked up or are not there. i have run into this type of problem befor when i tryed to fire my car. there was no power going to the injctors. after a long look over wireing diagrams i found the prob. there wasent proper wire pinouts in my harness conector. am i going to have this prob again, if so what elts can i do. you guys have been REALY helpfull and i thank you. sorry for being a pain lol

 

I'd be looking really close at the IAC. Reset the minimum air and TPS position, clean the pintle on the IAC, and the passages with carb cleaner.
Get a proper GM/Helm manual for the year TPI system you're using and make sure your wiring is correct.

 

If you have a stock fuel pump, and continue to run 60 psi I would expect that the pump will fail. That's about 40% over what it was running at before.... Buy some new/bigger injectors.

 

Dont compensate for injectors with an AFPR, its a crappy crutch at best and certainly not linear.

Also 5spd memcals are different than auto ones, most specifially in low load timing and all idle and IAC functions.

Put it together like it is supposed to be(a 350 TPI) and then try working out the bugs or you'll just be slapping one band aid over another one.

later
Jeremy

 

i am going to try setting the tps and the iac again tonight to see if maby it might help. the fuel pump is an after maket inline pump with a 125 max psi rateing, i am just useing the AFPR untill i can get my hands on some new injctors.

 

ok now i have ste the iac and the tps but the engine is still serching for an idel and i can get the car to keep from stalling when i put it in gear, i can have the idel at 1500 and put the car in gear and it stalls, if i start the car in gear and fether the gass for a min and slowly let off it will idel but iraticly. also what is the proper timeing for the tpi 350 if anyone has it right handy, i would like to cross check that as well

 

With the pressure set that high, you're probably making the injectors malfunction. There doesn't need to be anywhere near that much pressure and it's probably hurting more then it's helping.

At least if you were working with a matched system (all 305 or all 350) that was remotely close to your actual drivetrain, you could start troubleshooting it. Instead you're trying to reinvent the wheel.

 

did you replace the prom chip for a 350? you know you cant just switch long blocks and drive off, you need up up the fuel press to 50PSI, and replace the injectors with ones designed for a 350. your pump can pump fuel just fine, itll prob handle a 400ci before it has problems.

*EDIT* a 305 should run at 42PSI and a 350 should run at 50PSI, those numbers come straight from GM performance dealers who know what they are talking about.

 

50 PSI?
That's a pretty big increase. A stock fuel pressure regulator is set to ~43.5 PSI which is the pressure that the fuel injectors flow is rated at. I wouldn't go more than 48 PSI, which is 10% over the stock value.

 

stock press regulators arent calibrated, just they are calculated to run that psi, but since production is high, chances are that you are running under 40 PSI. but you know as your CI gets bigger your press needs to get bigger too. since a 350 is bigger than a 305, it makes sence to increase the press.

PS: press=pressure.

 

Think what ever you want too. It's a free country.

 

Exactly

Also as far as the fuel preasure debate. You don't need no 50 psi . The I am running a stock 46 psi . I have no issues . Actually I am rich up top and lean on the bottom . But thats a tune issue . Preasure is not the way to compensate for lack of fuel like said above. The ECM changes pulse width to do that I believe. For the injectors used it's important to give the correct preasure for the spray pattern/ operation , to be correct.

Start by getting all things equal ....like all stuff for a 350 ...then go from there.