Why does my GMC Yukon knock at cold starts?

Hi, I have a 2008 Gmc yukon denali with 6.2 v8 engine 108500 miles, it knocks at cold starts up for 5 seconds and the noise goes away as the engine temperature comes to normal. What is the next step to solve this problem? Minutes. After start. The dealer agrees something Is wrong but Gm won’t do anything. ’07 Yukon Denali. Came from California.

What kind of engine knock does a GMC Yukon have?

2008 yukon xl slt 5.3L with a tapping lifter, right after 2k in transmission , 800 on bad electrical wires, 1200 on both axles , cv seal rotors and brakes, and now the tapping, and of course its paid for…thx GMC for your long lasting junk!

When does a GMC Sierra Denali knock the dash?

2013 Sierra Denali 1500 6.2L 57000 knocks at any temp until the engine warms up. It is worse when the temp is below 50 degrees. The dash is also cracked. This GMC has been nothing but a disappointment!

Why does my GMC Sierra knock at stop signs?

After the knock dissipates a ticking is noticable during slow and medium acceleration. The tick be ones more rapid as speed increases. 2011 GMC Sierra 6.2 engine, bought used with 50k miles, paid cash, engine knocks especially at cold temps, truck surges at stop signs and intersections.

What makes a 2007 GMC Yukon XL different?

Larger headlamps and a cleaner front fascia help distinguish the 2007 Yukon XL from its predecessor. Fenders, fog lights and lower side cladding are integrated into the body to create a more continuous appearance than the previous Yukon XL’s pieced-together look.

When did the GMC Yukon XL come out?

The Yukon XL is closely related to the Chevrolet Suburban, which underwent a similar redesign for 2007. Both go on sale in spring 2006. Larger headlamps and a cleaner front fascia help distinguish the 2007 Yukon XL from its predecessor.

How big is the cargo area in a GMC Yukon XL?

Cargo volume measures 45.8 cubic feet behind the third row. With the third row removed and the second row folded — made easier with an available power-folding feature — cargo volume increases to 137.4 cubic feet. Manual tri-zone climate control is standard in SLE trims. SLT and Denali editions get automatic climate control and leather seats.

Why does my Vortec 6000 make a knocking noise?

If you get a check engine light and codes for engine knock on your 6.0L vortec, it could be actual engine knock. However, if you do not hear any knocking noises but do have a CEL, you likely have a bad knock sensor. On the 6.0 engine, the knock sensor has a pretty crappy sealant on it which can cause water to enter the sensor.

When does a GM Sierra 1500 get a knock?

I have a 2000 Sierra 1500 with the 5.3L engine, and I am having the same symptoms. At about 9000 miles, it developed a knock (sounded like a lifter) when cold. The dealer did a GM-recommended “decarbon treatment” which did no good. The truck now has 15,000 miles and the knock is getting worse – even happens some when the engine is warm.

Why does my Chevy Silverado knock all the time?

It will also knock after the truck has been sitting for a half an hour, so it is not really a cold engine knock. I have about 6,700 miles on this engine and this is the second engine in my 2000 Silverado. GM replaced the original engine at 15,900 miles for the same reasons (knocking and tapping).

What does a GM 6.0 liter knock sound like?

At about 9000 miles, it developed a knock (sounded like a lifter) when cold. The dealer did a GM-recommended “decarbon treatment” which did no good. The truck now has 15,000 miles and the knock is getting worse – even happens some when the engine is warm.

Why does my GM engine make a noise?

The noise is more noticeable when the weather is below 50 degrees. The engine knock may be caused by an interaction between carbon that has formed on the piston, the piston motion, and the cylinder wall. GM engineering feels that this engine knock or piston slap is not detrimental to the vehicle. We are not so sure of that.

Why does my Silverado make a knocking noise?

This noise is different from other noises that may begin to occur at 3219-4828 km (2000-3000 mi). The O-ring seal between the oil pump screen and the oil pump may be cut, causing aeration of the oil. Inspect the O-ring seal and replace as necessary.

Why does my GM engine knock when I start the car?

The engine knock may be caused by an interaction between carbon that has formed on the piston, the piston motion, and the cylinder wall. GM engineering feels that this engine knock or piston slap is not detrimental to the vehicle.

Where does the knocking noise come from in a car?

But there’s no one under your car and no one is knocking on your engine. The noise comes from deep in the bowels of your motor. When you rev up the engine, the pitch and frequency changes.

What causes a loud cold start knock noise?

I don’t think there is anything (maybe a rebuild) that will fix the piston slap. The lifter noise is usually dirt and, or wear, that lets the lifter “bleed down”. Sometimes as @ Conlan Rose suggested, it might be a slow to build oil pressure issue, that is caused by a dirty oil filter, sometimes it’s clogged oil passages.

What causes GM engine knock and piston slap?

Why does my GMC Yukon make a clicking noise?

This piston “slap” noise described appears to be manufacturer defect in 5. 3 liter engine where shipment of engines with cylinder heads that are oversized or pistons shipping as undersized is causing warping on piston head, hence the reason why the noise progressivly gets louder and longer lasting as time progresses.

When did GMC Yukon start having engine problems?

Only suggested recourse is to replace engine with 5. 3 that shipped after September 2002 and was not manufactured from one of three gm plants responsible for the manufacture of the defective engines. See all problems of the 2003 GMC Yukon .

How long does the GMC Yukon engine ticking last?

Engine ticking on startup, lasts for 5 minutes currently – longer on cold starts or after letting the car sit overnight. Progressively has gotten louder and longer in duration since reporting the failure last year to the dealership.

Are there any problems with the GMC Yukon?

GMC Yukon owners have reported 13 problems related to engine clicking and tapping noises (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of GMC Yukon based on all problems reported for the Yukon.

Why does my GMC Yukon knock at cold starts?