Glow plug flashing intermittentaly

gjseb · Post by **gjseb** » Thu May 16, 2019 9:41 pm

Comes on and start flash then goes off on drop in speed or how it drives run fine just wonder if any one got any ideas

maxx007at · Post by **maxx007at** » Thu May 16, 2019 9:56 pm

Have someone with VCDS/VAGCOM diagnose it first I’d say.

Could be anything, from failing glowplugs to a sensor not working as intended.

gjseb · Post by **gjseb** » Thu May 16, 2019 9:57 pm

I got vcds was just being lazy as can't be bothered to go out too van and plug it in lol was hoping some one might know lol

Post by **Doc** » Thu May 16, 2019 10:00 pm

No point guessing, VCDS will point you straight to the problem. A flashing glow plug light might be anything on the engine.

maxx007at · Post by **maxx007at** » Thu May 16, 2019 10:01 pm

I get that, but only the flashing glowplug doesn’t tell you what the problem is.
Since that is used for showing that there is any problem related to the ECU, you’ll need to hook up diagnosis first before you can start solving it.

Otherwise you could be changing glowplugs, wiringlooms, etc only to find out it was a failing sensor of a few quid

Edit:
I saw Doc also answered

gjseb · Post by **gjseb** » Thu May 16, 2019 10:30 pm

Those are only fault codes on there

gjseb · Post by **gjseb** » Thu May 16, 2019 10:44 pm

Right had a quick look it's saying over internet about cruise controll I don't even have cruise control

Post by **Doc** » Thu May 16, 2019 10:51 pm

Underboost (Control range not reached) and the brake switch implausible signal will likely both need resolved and either one may have brought on the flashing glow plug light.
Searching the internet can lead you down many dark roads if you don't know what you are looking for, the brake switch fault is a common cause of cruise control failure which often times is a driver's first indication of a problem with the switch.

Post by **Doc** » Thu May 16, 2019 10:53 pm

The brake switch fault is the most recent if you look at the mileage at the time of the fault.
279297km...

gjseb · Post by **gjseb** » Thu May 16, 2019 10:57 pm

I don't have cruise control though doc or does that not matter and change the switch and what is the under boost one

Post by **Doc** » Thu May 16, 2019 11:07 pm

You still have a brake pedal switch which can go faulty irrespective of whether you have cruise control or not.

gjseb · Post by **gjseb** » Thu May 16, 2019 11:12 pm

Right okay all my break lights work but will replace that what about boost code mate

Post by **Doc** » Thu May 16, 2019 11:22 pm

Underboost is maybe a blocked filter, leaking boost pipes or a faulty turbo.

gjseb · Post by **gjseb** » Fri May 17, 2019 6:15 pm

What is best way to check for boost pipes and I don't want to sound daft but is there any common ones that go

Peli · Post by **Peli** » Tue May 21, 2019 8:42 pm

I always use brake cleaner. For this you do not have to spray much on the hoses and intercooler. You hear quickly enough whether the engine starts to run differently.

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