Hard to start when Hot, RICH Startup

b20beast · Post by **b20beast** » Fri Jul 03, 2009 10:05 am

Heres the run down guys. 1000cc precision injectors Stock Gsr Motor. When the car is cold, She fires up good. When hot, Takes alot of cranks to turn over and start. Also when she starts up, Warmup is RICH like 10:1 AFR. Anyone has advise on what to tweak. Cranking Trim is -73

thething96 · Post by **thething96** » Fri Jul 03, 2009 10:22 am

Are you adjusting IAT compensations? When the engine is warmed up, the IAT will probably be on the 159 degree column. At that point I would say add negative values( like -5,) that will make the car run leaner. Big injectors seem to be harder to tweak with IAT compensations. Try it out and post..............

b20beast · Post by **b20beast** » Fri Jul 03, 2009 10:37 am

thething96 wrote:Are you adjusting IAT compensations? When the engine is warmed up, the IAT will probably be on the 159 degree column. At that point I would say add negative values( like -5,) that will make the car run leaner. Big injectors seem to be harder to tweak with IAT compensations. Try it out and post..............

That may affect my tune tho...

thething96 · Post by **thething96** » Fri Jul 03, 2009 12:30 pm

That may affect my tune tho...

You should ajust idle and light load to begin with, and if necesary, adjust mid load and high load.........

b20beast · Post by **b20beast** » Fri Jul 03, 2009 12:41 pm

thething96 wrote:
That may affect my tune tho...
You should ajust idle and light load to begin with, and if necesary, adjust mid load and high load.........

I do not understand. The map is tuned already. Wont adjusting the IAT compensation tables throw off the whole map?

thething96 · Post by **thething96** » Fri Jul 03, 2009 2:19 pm

It will change afr's on the desired section. For example, your car idles good when cold, but idles pig rich when hot. Adjusting the iat idle and light load at x temp, will only change afr' in that area(idle and light load). The rest of the map(mid and high load) should remain the same. You'll only change the areas that you need to adjust, not the whole map..............

b20beast · Post by **b20beast** » Fri Jul 03, 2009 2:41 pm

Where is light load at x temp

thething96 · Post by **thething96** » Fri Jul 03, 2009 5:03 pm

Go to parameters, fuel and ignition corrections, and IAT corrections............

Post by **calvin** » Fri Jul 03, 2009 6:32 pm

put int -76% from crank trim and -20% postfuel. IAT table i always leave stock with 1000cc and even 1650cc

Civic VTI-Turbo · Post by **Civic VTI-Turbo** » Sat Jul 04, 2009 12:27 pm

Try to look at your offset table. I'm also having the same problem. Check your battery voltage if it is staying stable.