Spraying soapy liquid over a join or where the exhaust manifold mates to the cylinder head can also help. If air is blowing out of where you spray, it will be easier to spot the soapy liquid. This may turn into frothy bubbles, which are even easier to see. Common problems with some exhaust systems have resulted in repair sections becoming available. This often arises on an expensive component, such as a catalytic converter or DPF. If it’s common for a connecting end to corrode and break, then a repair section may be available. This will usually involve removing the component to fit the repair. Welding repairs

The Holts Gun Gum Putty provides a gas tight seal on your exhaust, permanently repairing small holes and leaks in silencers and exhaust systems. Gun Gum is a leading car exhaust repair putty which has been trusted by car lovers for decades. It creates a gas tight seal, and permanent repair is guaranteed, giving you peace of mind that your exhaust is working as it should. You simply press and smooth the paste over the hole or damaged area and leave it to dry, making it an easy DIY solution for home exhaust repairs. If your car’s exhaust sounds like a tractor, follow our guide on how to fix a blowing exhaust to find the problem and fix it.

If an exhaust is blowing from a join, it may be possible to tighten that connection to seal it. Exhaust clamps can sometimes rattle loose. Or perhaps the wrong size of exhaust clamp is fitted, which means it won’t seal the connection. A blowing exhaust can be caused by a wide range of problems, so we’ll examine each one in detail. And perhaps the best starting point is to identify exactly where it’s coming from, which isn’t always so easy. Where’s the exhaust blowing? If you have heatproof gloves, it may be safe to hold the exhaust where you think it’s blowing. This will help to muffle the bit that’s blowing and find the cause.

A blowing exhaust can be a bit of an embarrassment. It may sound loud, but to most people it’s hardly the music out of the exhaust on a performance car. Plus, you could get stopped by the police, no matter where you are in the world.

Fumes leaking out of your exhaust in the wrong place can increase your car’s emissions, and they can also damage other parts of your car. Holes can develop on different parts of your exhaust, so the Gun Gum range contains products that can fix any area. The company has developed a variety of bandages for different parts of the exhaust system, for example ends or bends. When you use these with the Gun Gum exhaust paste it creates a permanent, gas tight seal that will fix the problems ahead of your MOT – and cost a lot less than a replacement exhaust.

A large hole in an exhaust system isn’t so easy to fix with a bandage, exhaust paste or anything else. In most cases, the only answer is to replace that section of the exhaust system. Repair exhaust sections With this method, you don’t need any special tools and you don’t need to take the exhaust apart. All you need is the ultimate exhaust repair kit: the Gun Gum Exhaust System Repair Paste and the right bandage. What Gun Gum product should you use? A small hole can be the cause of a blowing exhaust and it really doesn’t have to be too big. Finding such a hole can be difficult, but our soapy water method can help. Once a hole has been found, clean the area with a wire brush or wheel to examine it. This will help to see if and how it can be repaired. Exhaust bandages When looking for the source of a blowing exhaust, remember that the fumes are dangerous and harmful. So make sure there’s plenty of ventilation. Exhaust manifold blowingWhere a join in an exhaust is leaking, it may help to tighten any clamps or other fastenings. If that doesn’t help, what next? Where a flange is fitted, there may be a seal or gasket that can be replaced. This will involve separating the join where the exhaust is blowing. However, it may not mean the exhaust system needs to be removed. Providing there’s room to separate the exhaust and replace the gasket or seal, you can do it in situ. Exhaust paste They should be considered a temporary repair, but can last for many months if applied correctly. I have found that a good seal can be achieved if you wrap some tin plate around the damaged section before applying the bandage. If the exhaust manifold is still blowing at the cylinder head, fitting a new gasket is our next suggestion. Loose exhaust clamps A flexible section of an exhaust helps to provide some movement in the system and reduce the risk of fractures. However, if the flexi-section leaks, it’s not so easy to fix. Replacing it is often the only answer. Large exhaust system holes If an exhaust system is blowing around a join, it may be possible to seal it with exhaust paste. This helps to fill any gaps where a clamp is fitted. Dismantle the join, clean it with a wire brush, then apply some exhaust paste. Reassemble the join, fitting a new clamp if necessary. In some cases, running the engine will enable the exhaust paste to dry as the exhaust warms up and thus you have a fix for your blowing exhaust. Flexi-sections