Misfiring mark 4 golf, 16v 1999. new cam belt,

why not read the service manual and not guess.
so you are timing the cam
ours has 2.0L and 2.8L not 1.6L
so what country is this? the books are by country first, then year,
and model and year.
the timing belt (cog belt)
some engines time at TDC #1 firing,
other cars do #4 (with odd cam bias forces)
what this car does IDK but there are SOHC , And DOHC, and 8v and 16valve heads, and the 2 kinds, are not the same
you said magic word cam locks so is the DOHC dual cam head. sure
but our 16v is chain drive. so...
so I have no data on it. 1.6L

google finds this.

https://pmmonline.co.uk/technical/timing-belt-replacement-volkswagen-golf-1-6l-16v/


so is TDC #1 firing (compression) not exhaust stroke TDC.
the settings.

lacking relic manual 32 years old and ago.
all you can do is google it or buy one used on ebay
or google endlessly or like above 1 seconds work.

I do not know if this engine is interference type, and is first thing to learn before tool box open !
google finds

16 valve diesel Interference!

misfiring is from plugs , HT leads ,moisture in the circuits and injector problems including low fuel pressure. use HT lead bridges to stop leads touching each other, clean out the interior of the distributor cap. ensure that the HT leads are pushed fully home in the cap and on the plugs . clean the distributor outside so the that spark cannot track through the dirt/oil.

the timing is 180 degrees out so ignore where no 1 lead should be and rewire the HT leads to the new position for no1 cylinder. The crank timing mark should be on 10 degrees advanced. Engines are timed off the crank position so forget the cam position.
Or you can start again. Remove no 1 plug and turn the engine over until you feel compression under your finger over the plug hole. Set the timing on the crank to 10 degrees before tdc. Position the distributor so that the point of the star is directly opposite the exciter coil in the distributor. The rotor button should now be facing no 1 cylinder plug lead adjust the HT leads so that they will fire in the 1342 firing order. Start the engine and with a timing light attached to no 1 plug lead adjust the timing mark to specifications by turning the body of the distributor.

g16a or b
the cam cog mark is at 12pm matching the same mark
at the back 12pm tins at rear of cam cog.
this mark is TDC #4 firing, number four.
pick 8v or 16v engine.
http://www.fixkick.com/t-belt/tbelt-index.html#Tbelt-main

documented 3 ways, by page new page, by FSM and by instruction sheet that came with all new belts (GATES)

the cam cog has 2 false marks, do no use them
use all E marks. 16v and see 8v for its false marks too.
1995 had 2 engines, 2 EFI and 2 heads. as an option.
fact. G16A or B.

CHECK FOR YOUR SPARK HT LEADS IF ARE CORRECT IN FIRING ORDER. CHECK FOR YOUR CRANKSHAFT SENSOR,OR CAM SHAFT SENSOR. ALSO DO AGAIN A DOUBLE CHECK FOR YOUR TIMING MARKS AND FITTING.

on what, spark or cam???
this engine 1 of 2, has cam belt timed
and a distributor timed... know that as a fact;. please.

http://www.fixkick.com/t-belt/16-fast-belt-install.html

that is cam. on 16v only
the pages there cover both engine,, G16a and B.
TBI 8valve and MPI 16v engine.

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .

take the head off bent valves thats for sure

The timing could be 180 degrees out you will have to do it all over again. Bring #1 cylinder upto TDC check the distributor rotor arm that it is pointing to #1 plug wire, It is important that the cams are on the intake stroke and not on the exhaust stroke. The crank is no big deal just make sure the marks are lined up.

Hi, there is a posibility that it may have bent valves, install new belt ,if your engine misfire or dont start at all ,there are bent valves, be sure to aling the timing marks ,perfect.. good luck