What should LLY balance rates be?

GM states that balance rates should be no more than plus or minus 4 (+4/-4) in park at operating temperature. It is important that injectors are tested at normal operating temperature, from low idle pressures all the way up to full load pressures (as much as 29,000 psi).

What should Duramax injector rates be?

A Duramax truck with stock injectors and tuning, at operating temperature, should idle with a calculated fuel rate (CFR) of 7-9 mm³ – and that is the baseline, i.e. balancing point, from which each of the individual cylinders gets its rate from.

How do I know if my LLY Duramax injectors are bad?

Symptoms of bad injectors on these would be engine over heating, loud knocking noise(should sound like a bunch of old typewriters), pour acceleration, white smoke emitting from the tail pipe. The easiest way to tell is to pull the oil dip stick and smell for a strong diesel smell in the oil itself.

What is cylinder balancing rate?

A balancing rate is defined as an adjustment to fuel volume for each cylinder at idle (below 1200RPM) as calculated by the ECM. These values may react to certain type of internal engine, fuel system and electrical issues as the ECM tries to compensate to maintain the best possible stable idle.

What is calculated fuel rate?

Fuel rate – average amount of fuel delivered to each cylinder measured in mm3/sec. It is an average. To calculate this value, the fuel rate for each cylinder is added together and then divided by 8 to obtain the fuel rate.

How do you know if you have a LB7 or lly?

If the 8th digit of your VIN number is a 1, then it is a LB7 Duramax (the early engine). If the 8th digit is a 2, then it is a LLY.

Are LBZ and LLY injectors the same?

The 2006 LLY and LBZ use the same injectors, but they are totally different from the injectors on the LB7 or the 2004.5 thru 2005 LLYs.

What is fuel balancing quantity?

Fuel Injector Balancing mean the fuel injector both in spray pattern and in quantity of fuel delivered are even. Due to dirt and contamination buildup over time fuel injector spray pattern and quantity delivery will change and become uneven. This in turn can cause many drivability or engine performance issues.

How many HP is 100% injectors?

100% over is roughly 200 hp stix from what most have said over the years.

What is the purpose of a power balance test?

A cylinder power balance test is performed to locate the cylinder causing a lack of power and not contributing to the engine’s balance and performance. It’s often used along with a cylinder compression and cylinder leakage test to pinpoint the problem.

What makes a cylinder not do a power balance test?

An engine analyzer does the same thing as this manual cylinder power balance test. It tests each cylinder and compares the results. The reason’s for a cylinder not contributing include an ignition problem, fuel delivery, or a mechanical problem such as a faulty valve or worn piston rings.

What are the colors of the power balance Viper?

Taking inspiration from the fast lines and stripes from sports, the Viper Collection features three stripes and is crafted from 100% Surgical Grade Silicone. Durable and made to last, these new wristbands are available in Black, White and Blue and come complete with two Power Balance® holograms.

What’s the best way to check balance rates?

Another good thing to do if you have the capability is to raise the rail pressure while checking the balance rates. Leaking ball seats will show up better at higher rail pressures than they do in the idle range, so by raising the rail pressure you can get a better idea of ball seat condition without doing a return rate test.