RA7 stalling on idle

Submitted: Friday, Jul 18, 2014 at 06:46
ThreadID: 108789 Views:4940 Replies:3 FollowUps:5
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Hi all
I have an RA7 Diesel Rodeo with about 90000km on the clock. Recently it has started having issues on idle. It will start readily, run for a bit then stop. This will happen a few times. If I keep the revs up it seems better. Thought it happened when cold but not necessarily. The mechanic has tested the rail pressure, it drops a bit and the engine gives a hiccup, it drops more and the engine stops. A couple of 4x4 threads talk about a fuel pressure regulator in these vehicles having some trouble.

Has anyone else experienced this or have any suggestions.

Cheers
Kevin
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Prado SX and a little van

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Reply By: Thinkin - Friday, Jul 18, 2014 at 09:36

Friday, Jul 18, 2014 at 09:36
Hi, Yes I've experienced the situation as you describe in my 2007 ra Rodeo from about 60,000-80,000 km at intermittent times Got the( suction valve, fuel pressure regulator valve ) one and same thing, replaced. No troubles in that department since. Holden Colorado and Isuzu Dmax of that era had the same trouble. Your friendly Holden, Isuzu dealer should know about this. Not saying to get them to fix it.

Cheers Alpero
AnswerID: 536234

Follow Up By: Ross M - Friday, Jul 18, 2014 at 09:56

Friday, Jul 18, 2014 at 09:56
Thinkin
I think you will find the suction control valve and the fuel pressure regulator are quite different items.

The SCV is in the head of the pump and the pressure regulator is on the rear of the pump.
Both do have a bearing on engine running or stopping though.

Not sure what pressure was tested for RUK 42 as the rail pressure will be in the order of 20,000 psi or more and requiring specialized gear.

The supply fuel pressure, if not enough, or varying, will alter the delivery to the SCV and the pump and then the rail pressure cannot be achieved.

Both the SCV and the fuel pressure regulators on RA's do give some trouble and may require replacement.

A pressure gauge on the drain end of the fuel filter will show regulated pressure which should be around 6psi.
If it is faulty the SCV has no chance to work correctly. If the low supply fuel pressure is at fault it can be replaced but until that is determined an SCV replacement may not fix it.
Cheers
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FollowupID: 820304

Follow Up By: Thinkin - Friday, Jul 18, 2014 at 10:35

Friday, Jul 18, 2014 at 10:35
Ross M
Your right, SCV and fuel pressure regulator can't be the same. Checked my invoice and it indicates suction valve was replaced, done 15,000km since and no further problems.
Cheers
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FollowupID: 820305

Reply By: gbc - Friday, Jul 18, 2014 at 11:04

Friday, Jul 18, 2014 at 11:04
Sounds a lot like when my suction control valve died on the colorado. Cheap 3rd party supplied part with a different part number these days since it has been updated.
SCV generally won't throw a fault code so is a bit difficult to trace.
AnswerID: 536242

Reply By: Member - RUK42 (QLD) - Friday, Jul 18, 2014 at 13:18

Friday, Jul 18, 2014 at 13:18
Thanks for the quick replies peoples - seems that he has just taken the regulator off and it idles ok - so .... new regulator from the Holden dealer and we'll see how it goes. seems the new part is an improved one too.
thanks again
Kevin
Suitcase
Prado SX and a little van

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AnswerID: 536249

Follow Up By: Ross M - Friday, Jul 18, 2014 at 16:05

Friday, Jul 18, 2014 at 16:05
Kevin
Because the engines are the same as the Dmax the new version of the regulator purchased from an Isuzu dealer may be cheaper but the same part.
It may pay to check that.
When i priced the 3 filters for 2011 Dmax I went staight to Oldhen and priced exactly the same items there.

Isuzu was (at that time) $185 approx and Oldhen was $270 for the three.
Anyone buying at Holden paid the $70 increase. NICE.
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Follow Up By: Member - RUK42 (QLD) - Friday, Jul 18, 2014 at 16:09

Friday, Jul 18, 2014 at 16:09
Damn. Didn't think of that one. Must remember for future reference. Thanks
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Follow Up By: Tonyfish#58 - Friday, Jul 18, 2014 at 16:52

Friday, Jul 18, 2014 at 16:52
This may be the issue

The Above link may also help

Regards Tony
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