caddy sdi 2005 vag com code 16688

[landi]

had rac out last night and they give us the code 16688 which is
16688 P0304 Cylinder #4 - Misfire Detected A or B / Blink

they advised new injector but was just wondering if it could be anything else [cheaper]

any advice would be gratefully received

only purchased the van this week so not very happy at all

[kenney]

Most of the time the cause for a misfire is a lack of combustion in a cylinder due to absence of , poor fuel metering, or poor compression.The first thing you need to do is check the compression,The injector can be checked with diagnostic equipment

[RICHRSW]

Hi I have the same problem. How do i check the compression?

Cheers

Rich.

[kenney]

You will need special equipment to check,the compression,Pull off central connector for the unit injectors. remove all the glow plugs,insert the adapter V.A.G 1381/12- in place of glow plugs.check the compression with a suitable compression tester.

[RICHRSW]

Thanks

What diagnostic equipment is needed to check the injector ?

Is it worth putting injector cleaner into the fuel?

cheers Rich

[kenney]

With Vag Com you can check the staus of the injectors in measured value blocks,one other thing to take into consideration is the injector wiring loom,there has been quite a few problems with them

[Alan02]

had rac out last night and they give us the code 16688 which is
16688 P0304 Cylinder #4 - Misfire Detected A or B / Blink

they advised new injector but was just wondering if it could be anything else [cheaper]

any advice would be gratefully received

only purchased the van this week so not very happy at all

Have you tried doing a continuity test on all of your injector wires?Check each wire from the plug on the head to the injector plug,and also check for short circuit too,across the other wires.