Hesitation at Start Up 2008 Colorado 5 cyl - Chevy Colorado & GMC Canyon
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post #1 of 4 (permalink) Old 03-28-2017, 10:56 AM Thread Starter
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Hesitation at Start Up 2008 Colorado 5 cyl

2008 Colorado 5 cyl Z71 138000 miles

Problem: Sometimes at start up after engine is at operating temperature and is shut off for a length of time (greater than an hour), which seems to vary based on outside temperature. Engine will hesitate at startup. RPM drops to almost zero jumps to 2000, back to zero up again and finally settles in at a little less than 1000 slowly drops to around 650.

Replaced Mass Air Flow
Replaced Camshaft Solenoid
Replaced Throttle body and sensor (Dealer replaced)
Cleaned PVC valve

Doesn’t exhibit problem when cold, never a problem with first start in morning.

If engine is shut off when hesitation starts it will not exhibit problem when immediately restarted.

Can shut off and restart multiple times and it will not exhibit problem.

Seems that it’s related to temperature of engine or related parts.

Never have seen a Check engine light
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post #2 of 4 (permalink) Old 03-28-2017, 11:47 AM
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to C'Fans.

That's a problem that I haven't seen posted before. Have the O2 Sensors ever been replaced? How old is the battery.

Most of the Generation 1 (2004-2012) owners hang out over at 355nation.net. You might find someone there that has experienced something similar.
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post #3 of 4 (permalink) Old 03-28-2017, 07:02 PM Thread Starter
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o2 sensors on bank one show range of .075-.820 and bank 2 of .15-.710. Because they are reporting a range I think suggests they are operating OK. Battery is about 4 years old, but problem has been around for a couple of years. Thanks for the 355 advice I'll post there also.
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post #4 of 4 (permalink) Old 03-28-2017, 08:56 PM
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