ULTM8Z

Interesting… I’ve been reading about cranking issues with Bosch-III injectors. While mine seemed to start ok with the factory ANHT settings and my Bosch-III's, I decided to play around with it a little to see what would happen.

What I found was that a 50% reduction in the Crank Fuel PW vs Coolant table generated a pretty good improvement (leaving everything else alone).

Given the higher flow at low PW's for these Bosch-III’s, it seems to make sense that reducing the crank fuel PW values would help (probably was getting too much fuel delivered during cranking).

MrWillys

Can you post a screen shot of what you did please? This way I can compare it to the ANHT original.

ULTM8Z

Left ANHT. Right is my modified version... (basically just scaled the whole table down by 0.5)

BOTTLEDZ28

iTrader: (9)

I had long cranking issues on two mail order tunes in the past. It was a PITA but has just about went away now that we have a new tune in it.

ULTM8Z

BTW, what do you guys define as "long" crank times?

I mean, mine certainly isn't one click and "VROOOOM"....

When first starting up cold, it cranks for may be 1 to 2 seconds and then starts right up. To me that's pretty good... seems to match my daily driver and my wife's car. But I'm not sure what a factory fresh TPI Camaro is supposed to be...

dfarr67

iTrader: (2)

what is a 'mike' tune? Mine will start ok run for 2 seconds and quite- then start ok after that.

RBob

iTrader: (1)

No longer DIY_PROM, moved...

RBob.

thtanner

iTrader: (1)

My wifes 88 with cold start injector literally turns over and is running. Barely a revolution of the engine. I've never seen a car start so fast to be honest. It makes me jealous.

My 89 with Bosch IIIs had a long crank time. 3-7s. I hated it. Tuned Performance made some changes to the stock 89 tune to compensate. Not sure if they were related to the IIIs or just the 89 PROM. Takes 2 revolutions of the engine or less to start now.