my car starts vevy hard when cold. did a data log today on cold start.here are some readings. tps=0.61 coolant temp=154.00 f start up temp=154.00 f manfold air temp=131.00 f maf grams=13.80 iac=84 steps blm=112 aften run 1min 124 this is on a mail order chip. my motor 355ci 10.7c vette 113 heads ported. lt4 hot cam 1.6rr HSR intake. stock tb. and maf. the motor runs strong and starts good after its warm.. i dont have a chip burner. but im thinking of buying one and no wb. o2.

coolant temp=154.00 f
start up temp=154.00 f
manfold air temp=131.00 f

This is a cold start?

my bad its not right. thats a old reading..

SORRY no post

her is the rear cold start ss. tell me what you think. im ording a chip burner this week.

Cold Closed Loop Timer Temp Threshold (59 deg F) If the engine is at or below this, it is considered "cold" and the timer value for cold closed loop will be used to determine when the car will enter closed loop.

Hot Closed Loop Timer Temp Threshold (158 deg F) If the engine is above this, it is considered "Hot" and the timer value for hot closed loop will be used to determine when the car will enter closed loop.

If the car is between the hot and cold temp thresholds, it is considered "warm".

At 73 deg F your engine is just warm.

When you say hard to start, does opening the throttle a little, make it start easier? Or does it just crank (turn over but not fire). Or maybe start, back fire and die?

It is chip tuning time for sure.

if i step on the throttle when cranking no start. how i get to start is turn key on and wait 2 min. then crank like 5 time and wait then crank some more then it startd up. and runs fine the cold mornings are makeing it worse.

Pull some of the plugs and look just after the first crank "cold" (setting over night). Also on the 4th crank, just before it starts, to see if they are wet or dry.

A data log would really help. Being able to data log is a must have before tuning.

i will check the plugs in the morning.. went to order the burn1 and its on backorder.. great. should i get the ostrich 2.0. but the think is i would have to work off the mail order chip.. i kinda wanted to start with a fresh bin.

There are a couple of items in play here. I agree that you should start your tuning with a stock GM BIN. Always recommended.

The HSR doesn't have a cold start injector. That will be an issue if the tuner used a pre-89 BIN for you.

Some calibrations hold off the injector pulses during cranking until two full engine revolutions. Makes for a long crank on cold starts.

If you can afford both an Ostrich and Burn1 you can start with the Ostrich. Then get a Burn1 and some chips later.

Without the cold start injector use a '89 MaskId $6E BIN. Cold start wasn't used in '89. Disable the VATs ('89 has it), burn it and try it out. A search for ARAP will bring up the no-injector-pulse duriung crank issue. Simple calibration change.

I can't recall which BIN BCC is for an '89 f-body. A check here on TGO in the tech section has that. Then see the 'davis site for a bunch of f-body BINs.

RBob.

I found a burn 1 with 5 chips. so i order it. should have it in 2 days. and i have a aujl bin. 89 l98.. to start out when the time come i might need help to set up the bin for 24lb. injectors. and vats egr delete.. thanks.

ok burned my self a new chip i used arap 6E. to work from dis vats .egr. set injectors to 24 lbs.. car runs much better. cold start fixed.. i just have the long crank hot or cold. i have like 6 turns on the motor then she starts up.
so thats what i will work on next.. the chip burning stuff is cool. its not that hard. my first burn works...im thinking of buying the AEM wide band set. $219
is a good price.

The long crank time is the calibration I mentioned previously. The injector pulses are held off until a certain number of DRPs are seen by the ECM. Ha, I just looked and I have a note about which table it is. The table to change for long crank is located at $38B, CRANK FUEL PW MULT Vs. REF PULSE.

Not familar with the AEM WB.

RBob.

changed 1-8 from 0 to .05 starts on 4 turns. now not bad.im happy.. thanks.

this is the mail order chip i have what do you make of the injectors size. i set up my size to 24.00 lb. why is the mailorder chip set up like that.

The XDF does not match the bin (chip). You can load any year or chip that will match the ECM, it may or may not run the engine. 1227165 ECM is used on V8 (3 different XDF's 32,32B, 6E) and 2.5 4 cylinders (acws).

If you scroll that screen (under constants) to the first few lines of code someone may reconize the master bin that was used to make your Mail order bin.

A super chip installed in a ECM out of a wrecked car I bought was based on a stock bin with only more spark timing and a little richer Tune.