Tank Mike

Right basicly I have a Ph1 172 and a 182 full fat and the are both suffering from the most annoying problem ever!- They dont start lol

Heres some background info

172- I bought this off ebay as a non runner. The last owner took it to renault and they can't figure out whats wrong with it. He then changed the ECU, chip and the little circut board thing thats part of the immobliser. It still didn't start. Then i Brought it. The fuel Pump primes and runs when cranking. The Injectors have a 12v feed and are firing. The coil however has no 12v power feed and therefore is not firing the sparkplugs. It has had new Plugs, Leads and a coil by the last owner.

182- Again I bought this as a non runner. The engine had blown up. The last owner took the old engine out but couldn't put it back in. so after sitting for 8months I brought it. I have installed an 8000mile old engine and it will not start. It has exsactly the same problem as the 172. The fuel Pump primes and runs when cranking. The Injectors have a 12v feed and are firing. The coil however has no 12v power feed and therefore is not firing the sparkplugs.

This problem is really doing my brain in! No one i talk to has ever heard of this problem, yet i have 2 cars doing exsactly the same thing!

Has anyone got any ideas?

Also is there a relay that has to switch to turn the coil power on? if so does anyone know where it is and what triggers it.

Immobiliser did cross my mind.

But if you take the chip out of both and try and start it the fuel pump doesn't prime and the injectors dont fire.

That was my little method of seeing if the immobiliser was turning off.

Also the red led goes out as well when the ign switched on.

Any help will be greatly appershated.

Thanks

Mike

escort1989uk

well if the light goes out on the dash it aint the alarm. have you tried a coil pack to see??? try there if not try getting the ecu read for some fault code maybe you mised something

Pikey735

try cliosport.net fella.

cjwood555

What happens if you run 12v straight to the coil pack?

Lee_R21Turbo

iTrader: (1)

Check all the wiring, fuses and relays to the right hand side of the engine bay, quite common for that to go tits up.

Also check the crank sensor & crank sensor wiring as that is a VERY common fault on them.

HTH

Lee

Tank Mike

I thought about crank sensors but the injectors are firing. I would of thought if the crank sensor was down the injectors wouldn't fire?

focusv8

Unplug the crank sensor and see if the injectors are still "firing"

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Gazzonator

iTrader: (9)

I'm just having a look on my works laptop to see if there any notes in there about the problem. Will let you know in a bit.

Tank Mike

Thanks mate

gup

iTrader: (1)

when cranking does your rev counter flicker at all
also when you say the injecters are firing are they firing randomly or as if it was trying to start (if that makes sense)

Tank Mike

Havent noticed the rev counter flickering. I think the neadle lifts ever so slightly. As far as the injectors goes, im not sure. they are defo injecting something but to what order or timing in not sure.

Gazzonator

iTrader: (9)

Non start - no live feed to ignition coil

Option 1 - >00MY Check fuse no.10 25amp in the underbonnet fusebox. Controls the engine functions. Located on the O/S bulkhead under a plastic grille.

Option 2 - 00>MY Check if fuse 5 15amp blown. Check wiring at back of cylinder head. Can chafe on heatshield. Also check the ignition coil, it can short out and blow the fuse.

Option 3 - 00>MY Check fuse marked for the heated rear window in the interior fuse box (sounds silly I know!!).

Option 4 ECU lost it's earth. Can't see it being that as you injector pulse.

Option 5 Bad connection on engine main relay. It's located under the fuse plate on the N/S inner wing. The main relay recieves it's switched earth from the ECU.

Will keep digging for some more possibilities.

Tank Mike

Thanks mate, I'll got and have a look at all that in a sec!

Silly me for not checking the rear heated screen! lol

Gazzonator

iTrader: (9)

Why the hell you would wire the ignition circuit through the heated rear screen circuit, god only knows! Ingenius!!

rs_turbo_tony

had this prob b4 renaults are very funny cars it lost ground to ecu check good grounds plus powers and remember to check with good multimeter cus cud pick up low volts from another network from ecu also have read faults plug located under ash tray some times if you cant get a reading from car no comunication thats a good clue to broken wire n/s front from ecu back normally yellow brown wire breaks hope this helps

gup

iTrader: (1)

the only other option fella is to try and get a pin data and check the wiring from the coil to ecu,ecu to crack senser ive had one before (on a peugeot)
one person was cranking it and the other was wiggling the main loom harness and it fired up then cut out (he didnt want to carry out a pin check tho lol)
and it was a slight pin hole to the live going to the ecu

cozzfather

iTrader: (1)

my mate had a 04 clio and it stopped going up a hill in north wales on the a55,soon as a traffic car pulls in and officer dibble gets out,he has a quick chat and says he has seen clio's conk out before and it was the wiring going into the fuse box or ecu i can't remeber which lol so my mate has a wiggle and then they try the car and it fires dickey mint,they both look at the copper and he just smiles and waves them off.

Dave McB

as above. wiring under battery tray known problem.

crank sensors really bad - quite hard to identify correct one - possibly been changed for wrong one already.

there are 2 or 3 that are very similar looking. as well as that, i think there can be a problem with wiring to the crank sensor. my work sells a modified crank sensor kit with additional wiring, so check it closely

focusv8

Any success yet

We're all here waiting for the answer.

Did turning the rear screen heater on allow the engine to start?



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Tank Mike

A quick update, the 172 runs. I cut the wire that earths the ecu off the loom and put it straght on the negative side of the battary and she fired onto life. just the 182 to look at now. It not the rear heated window fuse lol