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Old 10-20-2016, 07:41 AM   #1 (permalink)
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Default Glow plug problems.

Can anyone explain the following please?
I have a 2002 Suzuki Samurai. It is French, European made with a 1.9 Renault diesel engine. I had trouble starting it when cold and the icon for the glow plugs would not turn off. Once the temperature got up a little and with a hairdryer pointed, it did start no problem. I took it to a garage where they fitted new glow plugs but this morning - the same problem. I have heard of a glow plug 'module' but this does not seem to exist in France (or they have another word for it)

Anyone any ideas?
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Old 10-20-2016, 12:53 PM   #2 (permalink)
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Welcome to the forum. The appears to to be a few options for this unit (see diagram). It is sometimes referred to as the glow plug relay. It may well be used on other vehicles with that engine so may be worth searching for "F8Q glow plug relay/module". I would just put a voltmeter between any glowplug connection and earth, then check it gets 12v for a short while once the ignition is turned on. Also try searching the part number that may be on the unit.

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Old 10-22-2016, 03:15 AM   #3 (permalink)
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Many thanks. Problem now solved - small plastic caps near top of glow plugs perished, therefore letting air in. New ones have fixed. Minus two here this morning, glow plugs worked perfectly, started first time. Phew!
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Old 10-22-2016, 06:44 AM   #4 (permalink)
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If these are the little plastic caps that fit on the top thread, these are just insulators and shouldn't affect the operation at all. Still if they are working all good and well , if they play up again come back here
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Old 10-23-2016, 04:17 AM   #5 (permalink)
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Hi Darrell - looks like you're right about that. Am well pissed off - same problem again this morning and it's not even that cold. You would think a French mechanic could fix a Renault engine wouldn't you? Back on the phone to the garage tomorrow - Grrrrr!
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Old 10-23-2016, 05:38 AM   #6 (permalink)
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Sorry to hear that. I could only find one picture of the SJ419D engine bay, shows this Renault module. Can't say if yours uses this unit though. Obviously the wiring will also need checking to confirm the module is faulty.

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Old 10-23-2016, 06:06 AM   #7 (permalink)
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Many thanks again. The photo certainly looks like mine. Sadly, I'm not a mechanic so all I can do is point to it and try to explain in my dreadful French that it should be checked but you'd think they'd know....
I'll let you know what happens.....

Peter.
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Old 10-27-2016, 04:57 AM   #8 (permalink)
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Default Still problems

Me again....

Still not starting when cold. The garage say they've tested the power to the glow plugs and are now saying the problem is the injector which is part of the engine and has to be dismantled and sent off to be refurbished. They say it's been a problem on this particular engine which is why Renault discontinued it.
For the life of me, I can't see how this affects the glow plugs or pre-heating system. If it starts and runs normally when warm, how could this be the source of the problem?

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Old 10-27-2016, 03:29 PM   #9 (permalink)
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Do they mean the injector pump. I agree, as it runs fine once started and starts fine when warm I don't see why that should be the cold start fault. I've searched for common faults with the F8Q and can't find anything much.
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Old 10-27-2016, 11:41 PM   #10 (permalink)
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Thanks once more Darrell. I'm taking it to someone else this morning. (if I can get the bugger to start). It is possible that the previous garage started it up before the glow plug warning light went out. If you do that, the engine 'lumps' sort of revs and drops which I suppose could suggest a fuel problem but as it's fine in anything over 10 degrees, don't think that's the issue. I'll pass on anything I find out later today - someone else may have a similar problem.
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