HUMMER

HUMMER

There are 4 primary elements to the Hummer aftertreatment system which include : -

  • Diesel oxidation catalyst
  • Diesel particulate filter
  • Exhaust gas recirculation system
  • Catalytic convertor (petrol powered engines)

Hummer’s line-up of vehicles suffers from EGR valve, cooler and intake soot issues like most diesel vehicles on the market. Throw in DPF issues just for good measure if you are just pottering around the burbs at lower speeds as well.

Diesel Particulate Filter (DPF)

All Hummerdiesel powered vehicles have a DPF fitted to help in the reduction of harmful contaminants being expelled into the atmosphere. The soot emitted by diesel engines is particularly harmful to people who suffer with respiratory illnesses such as asthma, bronchitis and emphysema.

Over time the DPF can become blocked with a residue of ash from the soot trapped in the filter being burnt off in a process called regeneration. Periodic maintenance is required to keep the DPF functioning correctly which in turn will keep the running costs of your Hummer’s low, maintaining performance and reliability

. Exhaust Clean Australia are your experts in DPF cleaning with our revolutionary, market leading equipment ensuring clean emissions and trouble-free motoring. When you or your mechanic send your DPF to us for a clean please ensure that the sensors aren’t removed as we will clean them as part of the service for no extra charge!

Diesel Oxidising Catalyst (DOC)

Your DOC is an integral part of the entire after treatment system in converting the nasty by products emitted by your Hummer’s engine into safely breathable emissions that are no longer harmful to us or the environment. Regular cleaning intervals are recommended to ensure perfect operation of the DOC system to prevent costly failures, downtime without your vehicle and expensive repair bills. Exhaust Clean Australia, using our patented Italian made machines will keep your DOC operating like clockwork!!

Catalytic Convertors (CAT)

Catalytic convertors are an important part of the aftertreatment system on petrol powered Hummer vehicles to reduce hydrocarbons, carbon monoxide and nitrogen oxides to drastically reduced levels that are safer for the environment. These by-products of the combustion process are fatal in an untreated state. CAT convertor health and condition is important to ensure your Hummer is operating in a manner designed by the manufacturer to not cause harm to the environment as well as to us as human beings! Exhaust Clean Australia can clean your Hummer’s CAT convertor restoring their efficiency to an ‘as new’ state drastically reducing the risk of costly repair bills, increased running costs and most importantly reducing the damage to environment!

Intercooler

The Intercooler on your Hummer plays a vital role in your engine’s intake system. Cooling the incoming air temperature dramatically increases your vehicle’s performance, efficiency and contributes towards the reliability factor as well. Intercoolers are often overlooked maintenance wise till a problem appears or the vehicles performance has a noticeable drop in output. A dirty, oil filled intercooler will not be anywhere near as efficient cooling wise and if a turbo or other related engine failure has occurred the contaminants may well just be stuck in your intercooler ready to be digested back into the engine causing further possible damage. Exhaust Clean Australia’s revolutionary machines can return your intercooler to full efficiency and like new cleanliness giving you peace of mind trouble free motoring.

Exhaust Gas Recirculation (EGR)

The EGR system on Hummer’s vehicles reduces the combustion temperature by diverting a small portion of the exhaust gases back into the intake manifold. The exhaust gases are no longer combustible so diluting the intake air with exhaust gases makes the air/fuel charge less combustible.

The engine management system opens or closes the EGR valve to control the flow within the EGR system. The EGR valve connects the exhaust manifold to the intake manifold. The EGR valve is normally closed and there is no EGR flow when the engine is cold, at idle, or during hard acceleration. The EGR flow is at its peak during steady cruising under moderate load. This has a quenching effect that lowers combustion temperatures and reduces the formation of NOx.

If the EGR system is rendered inoperative because it was disconnected or tampered with, the cooling effect that was formerly provided by the EGR system will be lost. Without EGR, the engine will often knock and ping (detonate) when accelerating or lugging the engine. This can cause engine damage over time.

The EGR cooler and valve over time on your Hummer can become totally blocked with a build-up of carbon, oil and contaminants from the recirculating of the exhaust gases back into the intake system.

Common problems related to EGR system are as follows: -

  • Pinging (spark knock or detonation ) because the EGR system isn’t working, the exhaust port is plugged up with excess carbon or the EGR valve has been disabled.
  • Rough idle or misfiring because the EGR valve is not closing and is leaking exhaust gases into the intake manifold.
  • Hard starting because the EGR valve isn’t closing and is creating a vacuum leak into the intake manifold.

Exhaust Clean Australia is equipped with industry leading technology to successfully clean and restore your EGR cooler and valve back to its original condition. Savings in fuel economy and the restoration for your Hummer’s performance are the big benefits!! We also recommend having your mechanic perform an intake clean whilst we are taking care of your EGR system cleaning to receive the maximum benefits for your vehicle.

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