Engine Smoke Test - Check For Boost Leak | Slough

Engine Smoke Leak Test

from £60

In this test, a special smoke machine is used to send white smoke through your intake system. If there is a leak in your boost / vacuum pipes, the smoke will seep out through it allowing us to find the leak.

This test is beneficial for all cars as there is no other way to check for boost / vacuum leaks.

You can book your Boost Leak Test or Engine smoke Leak Test online under ‘Bookings’

Why Choose Onyx Performance?

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We’ve been proudly featured on Carwow – a testament to the quality, professionalism, and performance-focused results that set us apart. Watch our feature here to see us in action.

Expertise You Can Trust

With years of experience and deep technical knowledge, our team understands performance vehicles inside and out – from custom remaps to high-end servicing.

Advanced Workshop & Tools

We operate from a state-of-the-art facility in Slough, equipped with cutting-edge diagnostics, dyno testing, and industry-leading tools for accurate, high-quality work.

Tailored Solutions for Every Vehicle

We don’t believe in one-size-fits-all. Every car gets a bespoke approach, ensuring the best results whether it’s a remap, upgrade, or routine service.

Trusted Nationwide

Performance enthusiasts from across the UK come to Onyx because they know they’ll receive premium-quality workmanship, careful attention to detail, and honest advice.

Complete Care, All in One Place

From tuning and servicing to tyres, trackers, and immobilisers – we offer a full suite of services under one roof, all with a strong focus on safety, reliability, and top-tier customer support.

Customer Reviews

    
 
 
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   Anil Soni 
 
 
 
 Trustindex verifies that the original source of the review is Google. Thank you guys for your professional, dedicated and honest opinion. You made my day by fixing my son's car so he could use it for DoE at very short notice. Max and Kay were brilliant and I would definitely recommend this garage as a organised and trustworthy business. Keep up the good work.
  
 
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   subin pradhan 
 
 
 
 Trustindex verifies that the original source of the review is Google. Took my BMW 440i to install downpipe and mid pipe. Top guys with good service and reasonable price. Will be going back for more work done.
  
 
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   J JareCki 
 
 
 
 Trustindex verifies that the original source of the review is Google. I just done Stage1 in my audi s3, car drive superb, excelent service, thanks Ben,Sam and Onyx team! Brilliant work
  
 
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   Dan May 
 
 
 
 Trustindex verifies that the original source of the review is Google. Honest and knowledgable! Rare these days - saves me hundreds by checking my Golf R properly. Will only use these guys from now on
  
 
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   Darren Dawes 
 
 
 
 Trustindex verifies that the original source of the review is Google. I took my jaguar xfr to these guys for a re map . Excellent service. They could not have been more helpful. Very knowledgeable they definitely know what they are doing. If your looking for a re map I would highly recommend you speak to them.
  
 
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   Hana 
 
 
 
 Trustindex verifies that the original source of the review is Google. I was recommended Onyx to get my diamond-cut alloys refurbished. I am located an hour away but the recommendation was important so decided to leave my car with these guys. First impressions, the team were very polite, friendly (Essan, Ben and the guys that actually did the refurb in the intense heat) The prices were competitive. And the quality of work was super. There was slight miscommunication post the sale (which happens) but I was pleased they resolved this to my satisfaction. One idea I would suggest is advising the customer 'before' the work starts that the TPF valves may need replacing so we have the option to decide whether to do it whilst the wheels are off anyway rather than post refurb to avoid scratching the newly done alloys. Otherwise happy with my overall experience.
  
 
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   Mark 
 
 
 
 Trustindex verifies that the original source of the review is Google. Amazing service
  
 
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   pavan khangura 
 
 
 
 Trustindex verifies that the original source of the review is Google. The best experience ever well organised clean friendly team and the experience was amazing A big up to the whole staff.

Book an Engine Smoke Leak Test in Slough Today

Struggling with boost leaks, vacuum leaks, or unexplained engine issues? Our professional smoke leak testing quickly identifies hidden problems in your intake, turbo system, or exhaust. With fast diagnostics and expert advice, we’ll save you time and money on repairs.

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Frequently Asked Questions

What is an engine smoke leak test?

It’s a diagnostic method where safe, visible smoke is introduced into your vehicle’s intake or exhaust system to detect leaks that are otherwise hard to find.

Why is a smoke leak test important?

Boost leaks, vacuum leaks, and exhaust leaks can cause poor performance, rough idling, warning lights, and reduced fuel efficiency. A smoke test pinpoints the issue quickly.

What systems can you test with smoke?

We can test the intake system, intercooler pipes, vacuum hoses, exhaust system, and turbo setup.

Will the test fix the problem?

The smoke test itself doesn’t fix the issue but shows exactly where the leak is, allowing for faster and more accurate repairs.

Do you offer same-day smoke leak testing in Slough?

Yes — we offer same-day diagnostic appointments, subject to availability.

Can a smoke test help with turbo cars?

Absolutely — smoke testing is one of the most effective ways to find boost leaks in turbocharged and supercharged engines.

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