Rough cold startup - Page 2 - TerrainForum.net: GMC Terrain Forum
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post #11 of 16 (permalink) Old 06-07-2017, 06:15 AM Thread Starter
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Re: Rough cold startup

Quote:
Originally Posted by Rit
I would still guess the actuators. I think you have to reprogram the ECU after the procedure.
I wouldn't suspect the camshaft actuators because between changing them out and getting the fuel pump replaced, the car was running and starting fine. I too was suspecting that maybe the ECU needs reprogramming though. I'm going to bring it up with the dealership when I bring it in. I'm going to do a simple write up that outlines everything I have done recently to the car (mainly so they don't try to replace the exact same parts I just changed... unless something is truly bad).
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post #12 of 16 (permalink) Old 06-07-2017, 06:17 AM Thread Starter
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Re: Rough cold startup

Quote:
Originally Posted by Ralphalph
The oil level is okay? It's not consuming oil?

Does it sound like a cement truck once warmed up? Might be the timing chain starting to go. There is recall for premature timing chain wear. I think it applies to the 2010s.
Oil level is fine. No drop in oil level since last change, which was about a month or two ago.
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post #13 of 16 (permalink) Old 06-07-2017, 06:19 AM Thread Starter
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Re: Rough cold startup

Quote:
Originally Posted by bigb12359
hi ,

xTooltipElement

Service Information Home Number Search New Bulletins Bulletin Search Feedback TIS2Web Help


Document ID: 4679536
--------------------------------------------------------------------------------

#PIP5180A: Diagnostic Tips For SIDI Hard Start Cold - (Jan 24, 2017)
Subject: Diagnostic Tips For SIDI Hard Start Cold

Models: 2009-2016 Buick Enclave
2010-2016 Buick LaCrosse
2010-2017 Buick Regal
2012-2017 Buick Verano
2013-2015 Cadillac ATS
2008-2015 Cadillac CTS
2008-2010 Cadillac STS
2008-2016 Cadillac SRX
2013-2016 Cadillac XTS
2010-2015 Chevrolet Camaro
2012-2014 Chevrolet Caprice PPV
2012-2014 Chevrolet Captiva Sport
2010-2017 Chevrolet Equinox
2012-2017 Chevrolet Impala
2009-2017 Chevrolet Traverse
2009-2016 GMC Acadia
2010-2017 GMC Terrain
2009-2010 Saturn Outlook
Equipped with SIDI 4 or 6 cylinder engines

--------------------------------------------------------------------------------

This PI was superseded to update Model Years. Please discard PIP5180.


--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern
Hard start, extended crank, or black smoke from the exhaust when starting.

Recommendation/Instructions
Basic Tests:
Verify Fuel Quality?

Spark Test with ST125, if a coil issue is suspected then follow Ignition System Diagnostics.

Perform a Compression Test.

You should see 150-185 Average Compression, no cylinder should be less than 140 psi on a HFV6.

You should see 170-200 Average Compression, no cylinder should read less than 100 psi on the 4 cylinder engine.

If the condition is a “Hard Start Cold” only, and you suspect that you may have a carbon issue causing a valve to stay open, follow the latest version of PIP5029 and perform a cold compression test.

Also install a vacuum gauge prior to cold start and watch needle for signs of a sticking valve.

Fuel System Check:
*Follow all these steps in order.

The following tests should be done after an overnight cold soak.

Set your vehicle up with the CH 48027 digital pressure gauge and J37287 fuel line with shut-off valve.

Run vehicle to purge all air from fuel system and then shut vehicle off and let sit overnight.

Unplug the injector harness connector.

Next Morning:
Key On and do not start engine – Using a CH 48027 Digital Pressure Gauge, verify “Key On” engine off, prime pulse fuel pressure should be between 55-60 psi. Record reading.

This test will confirm correct operation of the in-tank fuel pump assembly.

Use your Tech2 or GDS set in PSI to also confirm what the Fuel Rail Pressure Sensor is reading as this should always be close to what your Digital Fuel Pressure Gauge reads for low side pressure during this test.

This will also confirm if there is an off-set with the Fuel Rail Pressure Sensor.

Next you will crank the engine to see if it fires.

With the injector harness connectors unplugged, the injectors are now electrically disabled so no fuel should be delivered to the engine.

When cranking over the engine, if engine fires this means that one or more injectors have been leaking and have introduced fuel into one or more cylinders.

Reconnect the injector harness connectors and start the engine, let the vehicle run for ten minutes and then shut vehicle down.

You will now close the shut-off valve in the J37287 Fuel Line, which will now separate the engine side of the fuel system from the rear section of the return- less fuel system.

Using the CH 48027 Digital Pressure Gauge, look for a drop in the high side of the fuel system, by monitoring low side pressure.

With the J37287 valve closed, the system should hold at least 60 psi for a few hours.

If you see a rapid decrease in fuel pressure, this would indicate a leaking High Pressure Fuel Pump or leaking injectors since the fuel pressure cannot bleed off to the tank as your J37287 valve is closed.
[/color]
All this is assuming that your gauge is good with no leaks or any leaks at the Schrader valve.


DEFINITELY going to print this out and give it to the dealership! Thanks!
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post #14 of 16 (permalink) Old 06-07-2017, 08:56 AM
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Re: Rough cold startup




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post #15 of 16 (permalink) Old 04-06-2018, 02:51 PM
Ikz
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Quote:
Originally Posted by NT110 View Post
I wouldn't suspect the camshaft actuators because between changing them out and getting the fuel pump replaced, the car was running and starting fine. I too was suspecting that maybe the ECU needs reprogramming though. I'm going to bring it up with the dealership when I bring it in. I'm going to do a simple write up that outlines everything I have done recently to the car (mainly so they don't try to replace the exact same parts I just changed... unless something is truly bad).
Have you actually found what was wrong with your Equinox? Mine seems to have similar sounding problem.
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post #16 of 16 (permalink) Old 03-28-2019, 12:44 AM
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I know this is an old post, so I'm hoping you see this. but my 2012 equinox is doing the same thing. Did you ever find out what the issue was? Thanks
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