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Author Topic: egr system  (Read 8507 times)

chrishandy28

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egr system
« on: 22 June 2012, 03:44:18 AM »
I have a question about a "modification" to the EGR system. I don't know if this can be done or if so if it will work the way I'm hoping.

First off I'm in the US so keep that in mind as far as emission rules, engine type, ect..
 OK, I have a diesel tow truck(wrecker) and it has a notoriously problematic EGR system that is prone to having a clogged cooler(heat exchanger) which causes blown head gaskets and other failures. So in states where they don't do emission inspections people have started to bypass this system by blocking off the inlet side of the cooler, which I just did to the forementioned wrecker a couple of weeks ago. It runs much better and is supposed to get better MPG although I can't yet confirm that. What this is bringing me to is that I read somewhere on here that the Saab that I have ('01 9-5 3.0v6) has a similar problematic egr system that can leak and cause major problems. So I was wondering if a procedure like the one I described above can be done on this engine? I realise that one is a diesel and one is gas but I'm not sure how similar they may be in this system.

Any thoughts or sugestions are appreciated
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Steve440

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Re: egr system
« Reply #1 on: 22 June 2012, 07:15:13 AM »
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Norfolk Jim

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Re: egr system
« Reply #2 on: 22 June 2012, 08:55:05 AM »
Steve that's diesel only...... :)
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sgould

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Re: egr system
« Reply #3 on: 22 June 2012, 08:57:53 AM »
Your V6 gas / petrol engine doesn't have an EGR.  Only the Saab V6 diesel as that.  I've heard that the diesel EGR can cause problems, but the expets reckon that it can confuse the electronic engine control to blank it off etc.

The weak points on the gas /petrol V6 are the rubber timing belt.  Well, not so much weak as needing to be changed when stated in the service and not left any longer.  If it fails the engine destroys the valves and pistons.

Also the oil cooler that sits in the middle ov the V between the cylinder heads corrodes and leaks, resulting in oil in water and water in oil.
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Audax

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Re: egr system
« Reply #4 on: 22 June 2012, 09:00:42 AM »
Quote from: chrishandy28 on 22 June 2012, 03:44:18 AM
Any thoughts or sugestions are appreciated

As far as I'm aware there is no EGR system on the 3.0 petrol engine, unless the setup for US cars is different to the UK? The most common problems I've seen on the V6 petrol are, leaking cooler between heads, faulty DI cassettes, faulty catalytic converter, other than that they're a reliable engine.
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collywobble

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Re: egr system
« Reply #5 on: 22 June 2012, 09:20:06 AM »
Just had a look in the EPC, which does cover model variants specific to other countries - there is no mention of an EGR valve apart from for the diesel engined cars, both 2.2 TiD and the 3.0 V6.
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chrishandy28

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Re: egr system
« Reply #6 on: 22 June 2012, 01:51:27 PM »
Quote from: sgould on 22 June 2012, 08:57:53 AM
Your V6 gas / petrol engine doesn't have an EGR.  Only the Saab V6 diesel as that.  I've heard that the diesel EGR can cause problems, but the expets reckon that it can confuse the electronic engine control to blank it off etc.

The weak points on the gas /petrol V6 are the rubber timing belt.  Well, not so much weak as needing to be changed when stated in the service and not left any longer.  If it fails the engine destroys the valves and pistons.

Also the oil cooler that sits in the middle ov the V between the cylinder heads corrodes and leaks, resulting in oil in water and water in oil.

O.K. I must have just confused the oil cooler for the EGR oil cooler in my truck, it is below the intake manifold sortof near the center of the top of the engine, but I thought all emission controled vehicles had an EGR system or at least an EGR valve?

Anyway, I would like to head off any possible problems with that component before problems arrise.
but it may be too late, yesterday when my wife got home from work(she drives it) there was water/coolant running out the bottom-front and the ! warning light was on and the resivoir was empty. So I'm hoping it's a hose or even the radiator and not the oil cooler.It had been using some coolant in the past week or 2 but very little until yesterday.

Great timing too since my truck wouldn't start yesterday morning!
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chrishandy28

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Re: egr system
« Reply #7 on: 22 June 2012, 01:54:30 PM »
Thanks for all the input guys.
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