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Matt
Matt, Mechanical Engineer
Category: Vauxhall
Satisfied Customers: 20575
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Mat i am still haveing problems with my vectra 19 tdi i have

Customer Question

Hi mat i am still haveing problems with my vectra 19 tdi i have changed the egr value new feul filter and the inter cooler it still keep s jerking when it is hot around 2000 revs
Submitted: 3 months ago.
Category: Vauxhall
Expert:  Matt replied 3 months ago.

hello

if you haven't already then check for 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 and can also allow the engine to rev up when not desired 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 enginerunning.

Check the hoseclips 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 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 sparkto 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.

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.

if the engine condition is the same then chances are the meter or the connection to it is faulty

It’s also worth cleaning the MAF sensor wires, as they can get coated with dirt over time which then offsets the reading

Use some contact cleaner or brake cleaner to spray onto the wires to remove the dirt – on no account touch the wires with anything as they are very fragile

Customer: replied 3 months ago.
Thanks mate on hols today for week so will not b able to check will let you no in week if we at last correct the problem
Expert:  Matt replied 3 months ago.

understood

just get back to me on this post

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