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2018 5.3 z71 Silverado running funny.

LxA

By LxA
in Engines & Drivetrain

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LxA New Member

LxA

Posted
Posted
 

Hi guys. So I’m new to this site, so I don’t know if this has been asked before. I looked everywhere and didn’t find anything so I assume it hasn’t been asked.

 

I own a 2018 5.3L Silverado z71 crew cab. 

I’ve had the truck about 2 years and 3 months.

Mileage is at 18,500. No AM add ons besides a Carven exhaust.

 

About a week ago, on a Friday to be specific. I turned on my truck and it struggled to start. It made this choking/Chugging sound and then I got a message on my dash saying ‘Engine Power Reduced’, after that it started shaking all crazy and I quickly turned the truck off. 

Let it sit for about 5 mins and turned it back on. Truck turned on fine, only issue is I had a check engine light. Truck drove fine no issues.

Come Saturday I didn’t drive the truck but I did turn it on. Same issue, turned on fine but still showed a check engine light.

Sunday, I drove the truck over to my girls house to have her dad check it. (He was out of town at the time.) When I turned the truck on, turned on fine and check engine light was gone. Girls dad plugged in scanner, no codes, no issues. Left it at that.

Monday morning, I drove my truck to the shop. They had it for about 5-6 hours. They told me they ran a few tests and came to the conclusion that it was the EBCM not communicating with the ECM. Parts were replaced.

Thursday I took the truck to a friends house, gave me the same complaint. Cleaned the throttle, and it gave me a bit more response but things are back to normal.

I’ve been driving the truck for about 5 days since it was at the shop.

Here are where the problems continue. Dealer and my girls dad could not find the problem because the truck is showing no codes and there is no check engine light on.

Truck runs really quiet on idle, wanna say 400-500 rpms. (Keep in mind I have a Carven exhaust with both resonators deleted and a 3 in pipe running from the cats back). When it’s parked or stopped, almost feels like it wants to stall. When I’m sitting on flat ground and I shift to D or R, the truck doesn’t move front or back without me depressing the accelerator.  Also, some days the exhaust sounds muffled like if there is something blocking the airflow, and some days it sounds fine. Usual grunts.

It also feels like the truck struggles to shift at times and other times it struggles to accelerate to 50 mph. But it’s not consistent.

There is this low clicking/knocking sound coming out of the front passenger wheel, and it follows back to the exhaust tip. 

Anyone know what it could be? I’ve looked everywhere online and it seems like it can be many things. TPMS, Fuel Pump, Fuel Injectors? Throttle issues?

 

Side note. I did have a friend who had the ‘reduced engine power’ and shaking 2 weeks after he bought the truck. Turned out to be a faulty fuel pump. His truck has no issues now.

 

Yes. I did mention the fuel pump to the dealer. It I’m assuming it came out fine after all the tests.

 

I’m taking the truck back to the shop on Tuesday because it’ll be closed Monday for Memorial Day.

 

I do have videos of the sounds but files are too big to upload. 

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