clio16v starting problems

Level 7 User Joined: 21 Feb 2005 Posts: 224

right i have a bit of a weird one here, i have just swapped engines (again) in my clio everything is turning over and is connected etc but it just wont start!

i have it down to a fuelling issue as fuel is not being fed to the injectors
i have independantly tested the injectors and the wiring feed to them which is reading the correct ohms quoted for each so i know they all work.
fuel is being fed to the rail from the pump fine with plenty of pressure but the fuel will only go as far as the regulator and only minimal will be sprayed out of the injectors as it is turned over. so far things that have been checked that are working are:
plugs
leads
dizzy and rotor arm
crank angle sensor
fuel pump
injectors
loom feed for the injectors
compression

then next thing i am going to try is the inlet manifold as i am unsure if some of the vaccum patways could be blocked, also i am changin over the knock sensor, cold start injector, temp sensors.

could this be right that if the vaccum system is not working right it cuuld cause there not to be enough pressure for the fuel to pass the regulator into the rail? (regulator checked as well)
i am totally out of ideas of what could be stopping fuel passing the regulator into the bottm half of the injector rail. any please would be helpful
this has really sumped

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

the only thing that affects pressure to the injectors are the pump and regulator.

Assuming of course the fuel filters fine and the pipes are not crushed.

You say theres fuel up to the regulaotr, well the regulators the problem isn't it.

Level 7 User Joined: 21 Feb 2005 Posts: 224

but i dont see how 2 different regulators that we tried dont work, the fule was being fed fine to the rail when it was on the other engine this morning as i drove the car into the garage to swap it, can they just die like that or does it look like i have an underlieing problem? the pipes are fine as the feed is coming through with loads of fuel, obviously the return is dry as its not going through the rail

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

what rail do you have?

theres 3 types, early metal one with the reg ontop of the rail, the later metal one with it in the end and the later plastic type.

i assume the middle of the 3?

If the fuel is there in the feed pipe then it shodul be goign into the rail. Unless its blocked.

Pull the feed line off and th eregulator and blow through the feed hole, it should be easy to blow through, if not there theres something blocking it.

Level 7 User Joined: 21 Feb 2005 Posts: 224

yes it can be blown through fine, so does this point to the regulator then?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

hmm, intresting, there shouldn't be any fuel through the return until the lumps fired. I would have though it would be open or a blockage.

You sure th eplugs ain;t wet?

You pulled the injectors and rail out to see if they squirt?

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

have you had the injectors out in the rail, and then cranked to see if they are spraying?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

haha stan I beat you nananana!

Level 7 User Joined: 21 Feb 2005 Posts: 224

yes i have had them out to see if they do and they dont even spray enough out to light a fag! the plugs aren't wet at all either Confused

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

injectors are the problem then assuming they are actually pulsing ok

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

thats cos ur a batty boy chris Wink

have you checked the actual fuel pressure?

Level 7 User Joined: 21 Feb 2005 Posts: 224

yes they are all pulsing ok as i tested them off the battery with 2 wires, they injectors are out of the old engine which worked as they were the first thing i tried, can it fuck them taking them in and out?

Level 7 User Joined: 21 Feb 2005 Posts: 224

stan wrote:

have you checked the actual fuel pressure?

pressure is fine seen as on taking the feed back off the rail i could have done with an umbrella to stop me from being soaked!

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

but is there a pulse at the plug?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

well with the fuel line off how much came out? you test it?

Level 7 User Joined: 21 Feb 2005 Posts: 224

yes the ohms read as the figures are stated in the haynes manual

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

ok, but is the ECU pulsing?? u should get a voltage at each of the inj plugs....

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

he means voltage at the leccy plug on the loom

Level 7 User Joined: 21 Feb 2005 Posts: 224

Chris H wrote:

well with the fuel line off how much came out? you test it?

in exact quantities i'm not sure but there was more than enough to get round the rail and back to the return pipe as i let the pump prime without being on the rail
cranking for about 5 seconds about quarter of a litre through the feed pipe

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

ha beat u Chris nananananana!

Level 7 User Joined: 21 Feb 2005 Posts: 224

Chris H wrote:

he means voltage at the leccy plug on the loom

yes the plugs on the loom to the injectors were tested too and were also right as to what they are supposed to be