ph2 8v GTi - wasted spark or not?

[Melchior]

Quick one - I know I should have looked myself but didn't want to remove anything at that point!

I keep reading that this car has wasted spark but then on parts websites (not 100% to be trusted I know) I keep seeing dissy caps and rotor arms for this engine.

[citsncycles]

I couldn't tell you for certain, but it could have both!

As it's a 4 pot it could spark the plugs in pairs, but someone here could tell you for sure.

[Vanny]

I think you can have both.

Most cars have Jetronic, but i think the later cars and the 4x4 variants have Motronic. Like you say, its pretty easy to tell once you're under the bonnet (if you know what you're looking for)

[Melchior]

Thanks Mike, I guess what I should have said is more like 'electronic distributor' although I always think of it as wasted spark. Never seen a mechanical dissy doing wasted spark but then my experience of these things does not include a huge number of different car makes so probably loads of things I have never seen!

Thanks Vanny - problem is I don't know what I'm looking for, these French things are new to me

[citronut]

simple answer is if it has a dizzy/cap ( even with electronic ignition ) it aint wasted spark,

if it dose not have a dizzy it will have a 4 port coil which will fire in banks of two, so each bank will fire a blank/wasted spark

regards malcolm

[Way2go]

if it dose not have a dizzy it will have a 4 port coil which will fire in banks of two, so each bank will fire a blank/wasted spark
regards malcolm

On the BX it is only one version of the Motronic that uses wasted spark M3.1. (as fitted to mine). It uses a double coil assembly.

But Malcolm, if the ECU derives spark info from TDC sensor and only sparks 2 plugs at a time, how does it know the phasing?

[Melchior]

This is the pic of my dissy area



For sure it is a dissy, there is a screw missing and I was able to manoeuvre it enough with the engine running to feel the rotor tapping on the inside of the cap!

[citronut]

if it dose not have a dizzy it will have a 4 port coil which will fire in banks of two, so each bank will fire a blank/wasted spark
regards malcolm

On the BX it is only one version of the Motronic that uses wasted spark M3.1. (as fitted to mine). It uses a double coil assembly.

But Malcolm, if the ECU derives spark info from TDC sensor and only sparks 2 plugs at a time, how does it know the phasing?

i suppose there is two points on the flywheel, so the TDC sensor sends two pulse's every one revolution of the flywheel

regards malcolm

[ghaddon1701]

Changing the subject slightly. I thought only Peugeot 205's had that type inlet manifold. Solid block looking type as opposed to the four individual pipe looking one. Learn something new everyday

[sdelasal]

... and only sparks 2 plugs at a time, how does it know the phasing? Ans: it doesn't need to:- at near TDC it sparks on both of the cylinders which are at the top of the bore - one goes bang - the other is 'wasted' - 'cos that cylinder is at the end of its exhaust stroke. Steve

[Philip Chidlow]

Changing the subject slightly. I thought only Peugeot 205's had that type inlet manifold. Solid block looking type as opposed to the four individual pipe looking one. Learn something new everyday

i've seen that before. I wonder if it's a 1.6 litre as fitted to the Visa GTi and Pug 205 1.6 GTi. Does anyone know if there was a BX 1.6 GTi on the continent?

Wikipedia says: "There was also a special export model, the BX16 GTi, using the 113 PS (83 kW) XU5JA engine from the Peugeot 205 GTi 1.6. Top speed was 194 km/h."

[MULLEY]

Yes, there is a 1.6gti version on the continent, did your friend from malaysia have one?

[Philip Chidlow]

(Shhhhh.... don't mention my friend from Malaysia )....

(I don't have one, Mulley) Do you mean Malcolm's CX?

[MULLEY]

Sorry, i meant "our" malaysian friend as in the chap who occasionally frequents the forum.

[Philip Chidlow]

Ahh I see. Back O/T AFAIK only pre 1991 cars had Jetronic.