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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21726
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a d22 with a ytd 25 engine that is difficult to start

Resolved Question:

i have a d22 with a ytd 25 engine that is difficult to start and will not idle below 1000 rpm above that the engine works perfect
Submitted: 10 months ago.
Category: Car
Expert:  Matt replied 10 months ago.

Hello

I'd start by removing the EGR blanking plate and drill a small hole through it of about 3mm as you may need some EGR flow to get it all to function correctly

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out causing rough running.

As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane or brake cleaner around each joint in turn. If the engine rev's up you've found your leak.

Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

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