A friend of mine has an 85 camaro wich was a 350 tpi, put a 383 with the tpis miniram intake, 30# injectors fastburn heads, holly 52mm tb, into the car. He wants to get it tuned but it wont go out of open loop. +runs way rich

with the new engine he swapped computers with a new ecu for an 88 transam 350. the car runs fine at idle,

car has no codes. with a scan tool the car reads up to 230* from the ect but still no closed loop. what should we check for?

Well, the 85 MAF was a different beast. I'm not sure if you can just swap that ECU. I'm not sure if the wires are in the right places either.

Also, the 30's require that the PROM needs reprogramming (change injector constants). What does the O2 sensor read? It needs to go either below 300mV or above 600mV to enter closed loop. Also a minute or two needs to pass before closed loop. The temp has to be above a minimum, also. Also, it might be detecting an O2 fault, and staying out of closed loop.

What fault codes are you getting?

has it been checked for closed loop while driving, or just at idle

some of these don't like to go closed loop unless the car is moving

I bet a big part of your problem is the 30# injectors. MAF cars especially hate when you lie to them about injector size. Stock 350 TPI injectors were only 22# and that's what the ECM is expecting.

Agreed with Red- you need the proper MAF to work with the later ECM and the matching later wiring harness. But I'd think you'd be getting check engine lights with the mismatched components, which you didn't mention, so maybe you're already done this with the rest of the upgrades.

Get it tuned first, then worry about closed loop.

car dosnt have any codes, need to check the o2 sensor the maf has a reading dont recall what it was reading.

Are you using long tubes? If so, then you might need a heated o2 sensor. Mine would go into closed loop once it got gas and started moving, but at idle it would go back to open loop.

Check the o2 voltage at idle, if it is stuck at 444-447, then you have a wiring short or the sensor is loose.

Could it be the Engine temp. sensor isnt sensing so the computer is thinking the cars not warming up??

Definitely need to scan the computer to see which sensor is causing it to drop out of closed loop.

Here's some of the things that prevent or make it drop out of closed loop:

Engine coolant temperature is reporting too low
O2 signal is too low
ECM senses throttle position as being too high/open, tossing it into power enrichment mode

A scan tool (or scan tool software) should be used to check all sensors to make sure they are giving you sensible data. It might be worth a trip to a tuner for help. I'd hate to hear that your friend's 383 has just washed out the rings from running too rich, or has burned holes in the pistons from running too lean.