c20ne conversion

[dover mk3 astra]

hi, im quite new to all this forum stuff. so please forgive me . i have recently put the c20ne engine from a 92 calibra into my 94 mk3 astra. everything is in i.e engine. g-box. split shaft etc. all wired up. now its not starting (was before removal). squirted some petrol down the intake and wd40 after as well...as it cranks it will fire on it but will not run, and have connected the fuel pump direct to battery just in case. i'm thinking its the crank sensor but if it is where would be the best place to get one from?? any help would be much appreciated

[novaredtop]

Has it got spark mate? Think when crank sensor goes it won't spark

[vectra640]

Yep if CS has gone then no spark, does it even try to fire? have you connected the fuel lines the right way round? if the fuel lines are round the wrong way it will not start

[munsterbigfeet]

the fuel pump relay on some of those also powers ecu up, worth manually bridging fuel pump connections. No ecu = no spark....

[vectra640]

the fuel pump relay on some of those also powers ecu up, worth manually bridging fuel pump connections. No ecu = no spark....

He already said in first post that it does this: "squirted some petrol down the intake and wd40 after as well...as it cranks it will fire on it but will not run" so the ECU clearly has power.

I'm thinking fuel lines reversed

[munsterbigfeet]

He already said in first post that it does this: "squirted some petrol down the intake and wd40 after as well...as it cranks it will fire on it but will not run" so the ECU clearly has power.

I'm thinking fuel lines reversed

as long as there is power they will generate one spark or spark cycle to fire, but will not run as relay opens contacts again. the relay breaks down, or has dry joints and circuit opens up again hence why it wont continue to run. I've done two now with same symptoms, bridge relays and low and behold, life!

[vectra640]

Yes but then it should do that without him having to manually put petrol into the cylinders correct!

[munsterbigfeet]

no ecu running, no injectors opening, ad fuel/wd manually will cough/fire but no injectors/fuel pump/spark once relay opens back up. 8v's are hardy engines, and after having converted corsa, astra mk'2's, cally's, I have yet to change a crank sensor on one. Brilliant engines. I'm putting 50p on power supply to ecu or earth somewhere. Try a jump lead from battery neg terminal to engine and have a go

[vectra640]

ok, seems odd having a engine thats able to run without its ECU but fair comment, clearly the ECu on the older 8v's just do mixture, AFR and a few other bits

[munsterbigfeet]

nothing like a ecotec or something more modern that one sniff of a sensor failing and it all goes off! No cam sensor to compare crank angle etc... better still when converted to dizzy and run from that! 8v 2.0 on dizzy and carbs = near indestructible!! Gee at Worthing has a 2.0 8v, with twin choke carb, done 200,000 now with nothing but oil changes!! Not even a cambelt or waterpump changed! One of the most forgiving engines out there

[vectra640]

I had a 2.0l 8v cav sri 130 mk2 and that was caned and never had its cam belt changed either, just went on forever, i even left it in a garage for a year and a half and just decided to go there one day and jump started it and first time fired up with no problems apart from a bit of a rattle till the oil got back up to the top, but as you say indestructible

[dover mk3 astra]

thanks for all your replies. answers to the earlier questions. yes it has spark and i've treble checked all earths lives etc. i can read the ecu with good old paperclip and keep getting code 31- crank sensor. i have tested all connection and getting voltage at injectors and everywhere else needed. on the weekend i'll make sure to double check the fuel lines. and i have also put a new ecu power/fuel relay in as could tell when still in calibra it was on its way out, plus it was 19yrs old. to the later comments, i chose the older 2.0 8v multi-point as i've found out myself the 8v's are well bullet proof. run it without coolant...low oil...just topped it up, and still kept on going. the calibra ecu is a bosch 1.5 as far i know

[8valve-craig]

+1, My 8v on carbs gets tracked @ 7k and seems indestructable.

A friend just had the same problem as you this week, Is your green wire connected near the coil? and have you got a rev counter wired in as his wouldnt run without one. wired in some digi's and it fired right up.

[dover mk3 astra]

yeah i made sure to get the rev counter in and the green wire is all there as far as i know. i had a chat with the master tech at work and from what he says i think vectra 640 is prob right in saying about the fuel lines.....as i didnt take the engine out i have no idea how the fuel lines went. my friend wanted it out asap, so guessing with some off it :@ :@

[neilb1798]

the fuel relay has to be earthed on the later type that i remember

[dover mk3 astra]

the calibra it came out of is a 92 so i would say its the early type 2.0 8v multi-point..feel free to correct me though if i'm wrong

[dover mk3 astra]

forgot to say....does anyone know where i can get 2.0 8v cylinder head as no.4 spark plug hole is bit knackered. on the off chance...if not i'll go to scrap in search of a cav or something similar (previous owner fuked abt with it a lil)

[dover mk3 astra]

very glad to say the engine is now running...and vectra640 was right it was the fuel lines.....1st thing takes a suggestion from someone else to make you think about it.....and 2nd thing i didnt take the engine out so was just guessing....thanks for all the suggestions from everyone.....will defo ask again if anything goes wrong

[vectra640]

No worries mate glad to help

[candy kane]

lol did you get petty in the eyes. I hate it when that happens. I had same problem switched over off it went good times....then big ends started knocking not so good times lol