hard to start when semi warm

rsamd1 · Post by **rsamd1** » Wed Sep 09, 2009 10:14 am

mods: k20a2, prb kpro, 750cc, jrsc 7psi, i/h/e

When i start the Car in the morning it starts fine after first cranking. When the Car is semi warm like 40-50C oil temp and warm outside it needs cranking a few times till the engine starts or idle is very low 200rpm 2secs and then it idles fine. Is there any solution for this plz?

Post by **Spunkster** » Wed Sep 09, 2009 11:05 am

Try adjusting the cranking fuel trim in parameters.

rsamd1 · Post by **rsamd1** » Wed Sep 09, 2009 12:47 pm

Cranking fuel +/-10% does not help. reducing injector pulse in 41c-61c range seems to help a bit.

Post by **Spunkster** » Wed Sep 09, 2009 12:56 pm

try larger changes to the cranking trim

rsamd1 · Post by **rsamd1** » Wed Sep 09, 2009 12:58 pm

Reducing actually got worse, i try add some 25% or so. thx

rsamd1 · Post by **rsamd1** » Sat Sep 19, 2009 8:19 am

adding +30% didnt helped. only got worse.

Bonny · Post by **Bonny** » Sat Sep 19, 2009 8:22 am

Mods: k20a2, PRA k-pro, jrsc 7 psi, 650 cc

I have the same starting problem. The car is almost too easy to start when cold or warm, but difficult to start when semi-warm (after it's been turned off for about 30 minutes or more).

Increasing cranking fuel by 10% makes no difference at all.

Increasing cranking fuel by 30% makes the car even more difficult to start when it's semi-warm.

Reducing injector pulse (ms) for 41C and 61C helps. I started out with 19.53 and 14.65. I have now reduced the values to 14.53 and 9.65. The car doesn't start perfectly, but it starts a bit faster.

Any ideas?

rensoyka · Post by **rensoyka** » Sat Sep 19, 2009 5:23 pm

it's not unusual to reduce cranking fuel trim 20-30 % with larger injectors. I run -10% with only 410cc injectors. I can't see any applications where you would add fuel to the cranking trim.

Axix23 · Post by **Axix23** » Thu Sep 24, 2009 11:24 pm

let me guess, rc injectors?

I had the same issue with mine, got rid of them and running bosch, never had a problem...

Bonny · Post by **Bonny** » Sat Sep 26, 2009 11:32 am

Yes, I'm running RC injectors.

I still haven't gotten rid of the starting problem when the car is semi-warm.

I might just try bosch injectors instead.