injection to carb conversion ecu queston

[brainz87]

hi

i have been scratching my head recently which hopefully i can get some advice on, i have a renault 5 campus it was a 1.4 fuel injecton but the headgasket went on it i decided to put a 1.7 f2n carb engine in, i put it all in connected everything up turn the key and nothing happens all the dash lights come on the heater, headlights etc, couldnt find a reason why checked all earths charged the battery still nothing, it seems as tho the starter motor wasnt doing anything, fitted a different starter motor still nothing, i have just recently found out that there is an ecu tucked up behind the dashboard could this be the problem? can i bypass it? would just simpley disconnecting it work? i do have another loom from an older r5 which doesnt use an ecu but i would rather not remove the dashboard to replace the loom, last time i did that by the time i had finished the dashboard was in an unusable condition.

[metroman]

Hi, do you have a wiring diagram for the car?

James

[brainz87]

hi there,

only the one that is in the haynes manuel but the ecu isnt even listed in the wiring diagram contents.

[metroman]

Have you got a current getting to the coil that works with the ignition? Have you tried connecting the starter directly to the battery? If you apply a positive feed to the solenoid it should click / make the engine turn over. Assuming the coil feed is working you should be well on the way.

James

[brainz87]

heres where i am at so far,
when i removed the 1.4 engine I'm sure there was no wire from battery to starter, it was just a white wire (exciter) and red to the alternator, i always thought that a starter has a wire to the alternator, exciter and a lead to battery so i put a lead from starter to battery.

when i posted this earlier i went back out and disconnected the ecu, put a battery on to see what happens i connected the battery and when i did i heard a sound i think it was the starter solenoid but the battery started smoking so i disconnected it, the battery didnt smoke with the ecu connected neither did the starter motor make a sound, do i have the starter connected wrong? or did the battery smoke because the ecu wasnt connected?

i havent checked the coil yet i was trying to get the starter going first but will do tomorrow,

thanks

[Adey]

back in the day i converted a mk1 clio single point injection to r5 gtt carb engine. all the starter stuff was the same on both cars, all i did was add the aei in in the place of the coil pack and connect a wire for the fuel pump to run. I pulled the whole loom out fot the engine bay and cut out everything that wasnt needed. It didnt have an ecu as sorts though. Was your a multi point injection engine? (don't think so being a 5) should be a single point injection engine?

[brainz87]

yeah it was a single point injection i removed the fuel pump as the f2n has a mechanical pump, swapped over the aei's and the tdc sensor i was hoping that was all it needed, i really couldnt think of anything why it wouldnt turn over,as a last resort i thought maybe the carbon canister and the few plugs it had might have something to do with it so i began tracing the wires back and thats when i spotted the ecu under the dash/carpet. the haynes manuel only has a small section on the ecu it says its in the engine compartment tho, tomorrow it looks like i will have to take the dash out and replace the loom for the ecu'less one i have, can you remember if there was a lead from battery to starter? i find it strange that the battery started smoking.


oh the car was a 94 campus, maybe the later ones had an ecu.

[Adey]

You sure the starter wire isn't shorted to the downpipe? That would cause some smoke. Doesn't have an immobiliser or something silly added does it?

[brainz87]

i have checked everything quite a few times I'm quite sure its not shorting out maybe an immobiliser, in the haynes manuel there is one diagram that is different to the others it says, battery - to chassis ground then to engine ground then a black 4.5mm wire to starter motor but on the same connection on the starter motor it has a red 3.0mm wire going to the alternator, it would explain why the battery smokes but that is a bit confusing so does the starter have a live from alternator and a ground to engine? is it normal to have a live and an earth on the same post? wouldnt it send a live to the engine ground point?

[Adey]

you wont have an earth and live on the same post. the starter usually has a main power cable from the battery and an exciter wire, earthing is usually dealt with through the block. if the main power cable isnt attached you should still hear the solonoid fire in the starter with just the exciter. id go back and and check the wiring elsewhere, check the alternator, then check for an imob.

[brainz87]

thanks, thats what i thought its like wiring up a plug with the live and earth to the same connection but it definitely says to do so in the haynes i got 3 people to check it, maybe its just an error if you have a haynes manuel for the r5 take a look at wiring diagram 15, the alternator only has 1 plug with two wires and a live and earth, the live and earth are not marked on the alternator i could try switching them around.