Harder to start when warm - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bigmoe** · 09-26-2020, 03:15 PM

08 5.3 LMG in my 65 GMC. Original harness, thinned. All stock except for intake and exhaust and the usual stuff removed from the original ECM. When cold it kicks/starts instantly with higher idle initially then settles down. When the motor is warm it takes about 3 seconds of crank or sometimes less and barely catches for a sec before it comes up to idle. Not a problem really just wondering why it does it.

sprint_9 · 09-26-2020, 08:55 PM

Your intake and exhaust have affected things enough that your tune is no longer correct.

09-26-2020, 03:15 PM	#1
bigmoe Senior Member Join Date: Oct 2014 Location: Brandon, Manitoba, Canada Posts: 952	Harder to start when warm 08 5.3 LMG in my 65 GMC. Original harness, thinned. All stock except for intake and exhaust and the usual stuff removed from the original ECM. When cold it kicks/starts instantly with higher idle initially then settles down. When the motor is warm it takes about 3 seconds of crank or sometimes less and barely catches for a sec before it comes up to idle. Not a problem really just wondering why it does it.

09-26-2020, 08:55 PM	#2
sprint_9 Registered User Join Date: Nov 2012 Location: 9 Posts: 862	Re: Harder to start when warm Your intake and exhaust have affected things enough that your tune is no longer correct.

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