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[garny]

Hello Everyone,Wondering if any experts out there can shed any light on my grand cherokee problem.Its a 2002 Overland 4.7 H.O.
The problem is that i can be driving for days without a problem and then by no warning the power steering is lost and also the Brakes very had and weak.The engine will also Die and i have to restart which takes some time to turnover as if loss of fuel.
Once started the Jeep can be fine for days again. (This,Luckily seems to be at Low speed and Revs).
This is quite Worrying when you travel with Kids in the Car.
Any Thoughts on the problem would be most helpful.Thanks in Advance.

[Mike Pavelin]

The engine is cutting out resulting in the power steering and brake loss. Get it to a dealer and get the engine controller scanned for faults.

[garny]

Thank you for that although the power steering and brake loss happens before the engine cuts out,would this be the same symptom.

[PtP]

As I’m sure you know, the power steering is run from a hydraulic pump on the engine and the brakes will fade or become very heavy if you lose the vacuum from the inlet manifold. Both of which will happen when the engine cuts out. It seems very strange you should be getting the symptoms before the engine cuts out though. Are you sure you’re not still coasting with a dead engine?

Dr Mike is your man, so whatever he recommends I’d go with!

[garny]

I am almost sure that the power steering goes,then immediately the revs drop right down and the accelerator does not work forcing me to stop and restart.Don,t know if this is anything to do with fault but i have a laptop obd reader and my engine management light illuminates now and then with a code (0171)which says is the engine running too lean.another code which is  pending is the same but with an asterix against it 0171*.
I am not a mechanic so sorry if i am giving too much irrelevent info if that is the case.
Would dealer engine check be any more indepth than my obd software to solve this annoying problem.
Thank you

[dxmedia]

Have you double checked all of the vaccum lines around the engine to make sure that there's no leaks?

[garny]

Sorry no i havent as i didnt know where to start looking but i can start by checking these pipes if easy to check.Thanks

[dxmedia]

The ends of the pipes can split and cause leaks, that can cause havoc with the running of the engine.

[garny]

Thanks i will find out where they are all located and check them.Would i hear any hissing from them at all or is it just a case of inspection.

[Mike Pavelin]

Your code reader is probably spouting rubbish as P0171 is a petrol engine code. Chances are it cannot communicate with a CRD WG properly as it was never sold in the US, where moste of the code reader software comes from. The power steering will pack up instantaneously if the engine stops, and as yours is automatic, this will be the first thing you notice. A diesel engine generates virtually no vacuum so the brake servo relies on an engine driven pump for this. Vacuum leaks will not cause a diesel to stall.

[garny]

The engine is the 4.7 Petrol Overland and sorry i forgot to mention that it has an LPG conversion.

[Mike Pavelin]

Teach me to read the question won't it!

Could be an 02 sensor fault.

[garny]

Your only trying to help,its ok i forgive you.

[Mike Pavelin]

Actually, on a 4.7, the cam and the crank sensors can both play up and cause cutting out as well.

[garny]

Ok looks like i am looking at o2 sensors and checking the vacuum lines,Thanks very much for your help i just hope i find something,Cheeers