2010 5.3 Hard starting cold- No check Engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**aotte1** · 11-11-2014, 02:15 AM

2010 Silverado with 5.3 engine just began starting hard when cold first time in morning. Colder temp, harder to start. Cranks for several seconds, starts - runs rough for about 20 seconds, then runs normal rest of day. Any common problems? No check engine light on? Coolant temp sensor?
Thanks,
Les

88Ironduke · 11-11-2014, 04:47 PM

Possible air intake charge sensor, I.think they are incorporated into the mass air flow sensor. Expensive and not for sure. The other culprit could ECM coolant temperature sensor..they might be operating well enough to not throw a code. First step would be to clean the MAF sensor with the appropriate cleaner and what if any effect it may have. . Lowest hanging fruit first in my book.

88Ironduke

**aotte1** · 11-13-2014, 02:32 PM

88IronDuke,
Thanks for the suggestion, will try easiest first. Do you think it could be a leaky injector.

11-11-2014, 02:15 AM	#1
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	2010 5.3 Hard starting cold- No check Engine 2010 Silverado with 5.3 engine just began starting hard when cold first time in morning. Colder temp, harder to start. Cranks for several seconds, starts - runs rough for about 20 seconds, then runs normal rest of day. Any common problems? No check engine light on? Coolant temp sensor? Thanks, Les

11-11-2014, 04:47 PM	#2
88Ironduke Registered User Join Date: Jul 2010 Location: Willingboro, NJ Posts: 489	Re: 2010 5.3 Hard starting cold- No check Engine Possible air intake charge sensor, I.think they are incorporated into the mass air flow sensor. Expensive and not for sure. The other culprit could ECM coolant temperature sensor..they might be operating well enough to not throw a code. First step would be to clean the MAF sensor with the appropriate cleaner and what if any effect it may have. . Lowest hanging fruit first in my book. 88Ironduke __________________ Retired USAF - No rockets, no mortars, no bad guys shooting...No stress!!! My Build Thread: Project 72' Green http://67-72chevytrucks.com/vboard/s...d.php?t=587932

11-13-2014, 02:32 PM	#3
aotte1 Registered User Join Date: Oct 2013 Location: lousiville Ky Posts: 2,645	Re: 2010 5.3 Hard starting cold- No check Engine 88IronDuke, Thanks for the suggestion, will try easiest first. Do you think it could be a leaky injector.



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