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Model specific boards => Golf mk2 => Topic started by: casinoblue on 30 August 2008, 15:26

Title: quick dizzy question
Post by: casinoblue on 30 August 2008, 15:26

hey guys,

have just rebuilt the top end of my mk2 16v. nervously turned it over for the first time today.................
turns over fine, but won't fire up :angry:

have replaced dizzy, rotor arm, plugs etc. there is a spark to the king lead, if a little weak. checked all timing marks, and all is fine there. the coil is getting 12v from the battery. the ignition module is getting 12v too.

the only thing i'm unsure of is the firing order of the HT leads onto the dizzy cap. have definitely got #1 at 10 o'clock with the rotor at TDC, but just put the others back where they came from, so not 100% they are correct.

a firing order and any other suggestions would be great thanks, did try searching but can only find 8v info.

thanks,
james. :smiley:

Title: Re: quick dizzy question
Post by: casinoblue on 30 August 2008, 15:42

p.s. fuel pump is priming on ignition, well it's buzzing.
the isv is also buzzing
 :smiley:

Title: Re: quick dizzy question
Post by: Jay on 31 August 2008, 11:38

Firing order is 1 3 4 2  :smiley:

Title: Re: quick dizzy question
Post by: casinoblue on 31 August 2008, 14:26

thanks jay :smiley:

Title: Re: quick dizzy question
Post by: rubjonny on 01 September 2008, 10:18

and on a 16v the firing order is anticlockwise, can catch you out if you're used to workin on 8vs. ;)

Title: Re: quick dizzy question
Post by: casinoblue on 01 September 2008, 11:42

thanks guys,

have checked the firing order and all is well, still won't start though :sad:

could it be due to the spark being weak, and what could be causing that?

have checked the voltage to the coil, and ignition mudule, don't really want to start replacing everything in the ignition if it could be something daft. The car started fine before I removed the head, so i'm a bit stuck now.............

tried bump starting it yesterday, thinking I might build up pressures etc. but still nothing.

argh! :cry:

Title: Re: quick dizzy question
Post by: rubjonny on 01 September 2008, 12:02

ok does the fuel pump prime?

Title: Re: quick dizzy question
Post by: casinoblue on 01 September 2008, 12:30

i'm pretty sure the fuel pump primes, it buzzes for a couple of seconds when the ignition is turned on. I'm also pretty sure that the fuel is getting in, as one of the injectors was leaking from the union when i first turned it over.

i'm thinking the problem is with the sparking side. stuffed an allen key into lead #1 and arced it to the body. there was definitely a spark there, but not as strong as i was expecting. I will check all of the leads later tonight.

thanks  :smiley:

Title: Re: quick dizzy question
Post by: rubjonny on 01 September 2008, 13:13

right that confirms the ecu is getting power, so rules out that side o it.  have you checked the voltage at the coil black plugs while the engine is cranking over?

Title: Re: quick dizzy question
Post by: casinoblue on 01 September 2008, 13:27

checked the voltage at coil as per the haynes manual. when ignition on there should be 2V initially then drop to zero after a few seconds. mine measured around 5.2V for a second then disappeared completely. do you reckon that indicates a dodgy coil? 12V feed from battery is defo getting up to it.

cheers  :smiley:

Title: Re: quick dizzy question
Post by: rubjonny on 01 September 2008, 13:39

yeah but i mean check it while cranking, see if there is a significant drop in voltage while engine is turning on starter :)not sure bout volt tersting thingy ive never tested a coil tbh!

Title: Re: quick dizzy question
Post by: casinoblue on 01 September 2008, 14:35

thanks rubjonny,

will check what it's doing when cranking tonight if i get chance

ta for the info

 :smiley:

Title: Re: quick dizzy question
Post by: rubjonny on 01 September 2008, 14:43

worth cleaning up all the battery/starter/alt connections and also the earth wires to the rear of the head :)