Project Clio 16v

Level 10 User Joined: 04 Nov 2005 Posts: 575

Right, I've been going over in my head what I could have done to cause this and I've just remembered something. When I was doing the compression test I had taken off the lead from the coil as I was fannying about with something or other and then forgot to put it back on before getting my old man to crank it over. A few sparks jumped from the coil to the area where the plugs go into the ignition module and then I got him to stop turning it over so I could sort it. As I say that might not do any damage but it's all I could think of, could it be possible cause in that it may have fried something?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

could have, nice cheap bit like the ECU...

Check the fuses

Level 10 User Joined: 04 Nov 2005 Posts: 575

checked all the fuses and they all seem ok. Couldn't feel the injectors clicking when cranking over. You reckon the ECU is a genuine possibility then? how much are they usually when bought off a car being broken?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

I doubt its the ECU they never fail unless they are shorted out by something.

Level 10 User Joined: 04 Nov 2005 Posts: 575

ok, next logical step seems to be to make sure petrol is getting to the injector rail. I'm guessing the way to check this is to put the fuel hose in a glass jar and make sure it's pumping petrol. My question is though, what fuel hose do I need to take off, as I'm not sure which of the two is which?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

well if the injectors aren't clicking then why would you look for fuel at the rail? if the pumps going then the fuel will be there.

Level 10 User Joined: 04 Nov 2005 Posts: 575

I just wanted to make sure tbh, is it that obvious when they do click that there is no way you wouldn't feel them firing? just incase I made a mistake or anything.

Are there that many possibilities for why the injectors won't fire? I'm guessing there is ECU, crank sensor, is there a power feed for the injectors that could be buggered?, some other sensors? I really am just looking for another step I can take to narrow down the possibilities.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

like I said before no ECU is gonna like HT voltage hitting it.

unplug the injectors and check for power feed to the during cranking.

Level 10 User Joined: 04 Nov 2005 Posts: 575

kl, will try that tomorrow. If theres no power I'll try and get hold of an ECU that I can try. Does it have to be from a phase 2 that the ECU comes or does it matter?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

shouldn't matter

Site Subscriber Joined: 28 Jan 2005 Posts: 3547

ive got an ECU if you need one.

Level 10 User Joined: 04 Nov 2005 Posts: 575

I'm already picking one up tomorrow from the same guy I got the ignition module off if I'm getting nothing at the injectors. Thanks for the offer though.

Level 10 User Joined: 04 Nov 2005 Posts: 575

unplugged one of the injectors (fiddly bugger of a thing) and during cranking it's getting 0.15 volts.

I'll check the rest in a minute, but is 0.15 volts about right or less voltage than it should be getting?

EDIT: Resistance of the injector is 3.8 ohms btw, incase that matters at all.

Retroholic Joined: 23 Dec 2005 Posts: 3315

surely it cant be this much technical higglely piggley suff involved

Level 10 User Joined: 04 Nov 2005 Posts: 575

lol, I don't really know bb. I've found my haynes now and it seems the operating voltage is 12v, so well below what it should be. What does that mean, ECU time?

The resistance is also given as 2.5 +- 0.5 ohms? should I be worried that it's 3.8? (just measuring across the injector itself)

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

ignore the injectors just now.

Check the TPS and map values, they should be about 5 volts.

if they are low as well then it may be the ECU buit it may be a dodgy ground or feed to the ECU. A wire may have snapped somewhere, that leaky coolant pipe you had dribbling on the loom won;t have helped.

Level 10 User Joined: 04 Nov 2005 Posts: 575

I presume the TPS is just the connector next to the TB? what about the map, where is that?

Mentioning that leak has just made me think, the coolant was leaking down around the area of the crank angle sensor connector, can these be taken apart and cleaned up incase it was ruined with all the coolant leaking onto it?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

the crank sensor connector, unplug it chances qare its dry.

map sensor is on the top offside of the engine bay, green connector going into it

Level 10 User Joined: 04 Nov 2005 Posts: 575

ok, TPS had three wires they were green(G), white (W) and purple (P). Readings were: G-W (between green and white) -3.6v, G-P 0v, W-P 5v

The MAP had three again, they were green and white (G/W), cream and purple (C/P) and orange (O).
Readings were: G/W-C/P -4.7v, G/W-O 5v, C/P-O 0v.

As you can see a couple were slightly below 5v between two of the wires, but both had a reading of 5v exactly between another two. Does this show anything?

This was all done just with the ignition on, which is what I pressumed you meant.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

sounds like the injectors driver has gone pop. Otehr ECU shoudl sort it hopefully

Level 10 User Joined: 04 Nov 2005 Posts: 575

cheers mate. Will try another ECU and see what happens.