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If no timing codes are present, I would ask you if the senoid on top of the cylinder head were replaced when engine was rebuilt and if so, are they GM units? There is one for intake and exhaust. Aftermarket units respond slower than GM equipment and once oil warms up they tend to cause iradic...

Did the the old timing chain guides fail? I ask because parts of the old guides could have gotten lodged in the oil pump pressure release valve. The n when it sits for a time, all the oil bleeds out and until pressure returns, you have chatter.

How much oil does your vehicle consume? If it's very high amount, that will eat cat/cons. Walker is the only aftermarket brand that will last for any decent amount of time on an engine with excessive oil burning. Most oil is synthetic now, so doesn't really smoke, just clogs up the cat/con in an...

To properly test the HPFP you will need a scanner that can show you the requested pressure at the rail vs the actual pressure. If there is a variance, the next step is to determine why. The pump is driven by the intake camshaft. If timing chain has slipped by a tooth, that would effect the...

Negron has it right. The sprocket has failed. Did the engine jump timing and lock stop? If so it's really important to inspect the camshaft snout also. You need to make sure it didn't rotate the keyway. It's becoming more and more common on the Equinox and Terrains we rebuild here

It sounds like that engine was way low on oil. Starved the VVT solenoids, stretched timing chain, bearings, etc. I just bought 2 this week from customers that can't afford to repair. Love these SUVs, but this oil consumption issue is frustrating.

I wonder if you have a "spun" snout on the camshaft. The keyway end piece is pressed on to shaft rather than being a single unit. It is common for an abrubt timing stoppage to cause the end to spin enough degrees to cause endless frustrating hours of on off reset try try again with same result...

Roughly, yes. Crankshaft mark near 5 o'clock

When I am installing these heads, I set the actuator sprocket on camshaft out of vehicle and turn camshaft to approximately where it will need to be timed, then remove the sprockets until needed. If your head is already mounted to block, then turn crankshaft with balancer counterclockwise 45°...

Oh oh oh, I am sorry I misunderstood. Yes, these heads use a valve overlap system that eliminates need for EGR valve. There will be some load /opening there.

Yes you can close all the valves by removing the intake and exhaust camshafts. All camshaft caps at numbered and machined to be in a specific spot, so note the position for when reassembled. Once camshafts are out, all the valves will be closed if not bent. Stand the head on its side and spray...

Make sure the tensioner has been removed from the cylinder head. Remove the chain guidez Make sure the crankshaft keyway is NOT at top dead center (12 o'clock). Best to have it counterclockwise about 45°. This is so you can safely turn camshafts to correct positions without risk of valves...

Use a long pry bar or screw driver to listen to the noise and source it's originated place. Should be able to get to outer bracket on fuel pump with tip of pry bar and other end to your ear. Was this sound present prior to timing chain replacement?

What upgrade are you referring to?

I have an ad on Craigslist and Facebook for rebuying these 2.4 engines. I have advised at least 15 people to try having GM cover the repair costs.before paying me to do the work. Without exception, all attempts were denied by GM. The most recent attempt was a 2011 Equinox with only 89K on it...

It's likely you will require more than just a head gasket if the engine has stopped running g. At the least, you should have the cylinder head checked for being flat/need of milling as well as vacuum tested to see if any valves were bent due to a timing chain failure (likely). Whe head is off...

The relearn procedure will tell all. If it is successful, I think your issue will resolve. If Unable to, then bigger problems line for you I fear.

Also, did you perform the crankshaft position relearn when did the reinstall?

Any chance the reluctor/phaser ring on crankshaft is incorrect or has a damaged tooth? Does the engine start right up or crank a few seconds before running?

We machine and rebuild them here in Las Vegas. Been mostly doing the direct injection 2.4 as they are all suffering from oil consumption. But we also do the non direct injection 2.4 as well as the 2.2. Costs on everything are up so its about $4200 installed now. Includes all fluids, labor and...