Have a problem with my 89 sapphire it won't start! It has spark and checked injector pulses with a noid and all getting signal. The plugs are not getting wet tho. It's running wasted spark and all sensors are new. Iv tested fuel pressure and I have 32psi so enough. The injectors are new Siemens it was running a few months back but it's been apart now it won't start. any ideas guys?

 

Lee check you phase connector I had this and it turned out to be a bad connection.
You hav'nt got your phase and crank sensor plugs mixed up?

 

32psi seems a bit low imo should be around 3 bar 45 psi

 

Had the phase sensor out and re gapped it's new too, also tried the plug inside both ways. I turned the fuel pressure up a bit later but the plugs were dry still. Didn't think of the plugs the wrong way around il have a look at that.
Also pinched the ecu off my other car so going to try that too, it's driving me around the bend now!!

 

I feel your pain. Its always the same running fine do a few upgrades then it don't bloody work.

Best one I had tuned a mates car 330 bhp all good. Drained the cooling system to fit a 500 cooler and water pipes and then it would never run right. ended putting the old set up in ran fine. Found out later that the map sensor had coolant in it where I drained it out of the header tank. And there a sealed unit go figure.

Got the feed and return pipes correct?

Paul

 

Yeah it's testing me! I had it running last Xmas, needed fine tuning but half there now it's been apart it's dead! It's the dry plugs I can't get my head around. Yeah the feed and return are ok, I had to replace the feed so that's the only change. Their temperamental old things at the best of times but iv always managed to get them running apart from this time.
I'm going to go through it all again then if I can't get it to run will be taking it to scs.

 

I got fed up with fault finding I got the iaw software and that always helps.

 

Yeah I bet, I'm fed up too so will end up taking it some where like scs but it's all more money again! Can see how people get fed up and end up breaking.

 

Wipe a feeler gauge over the crank sensor while ignition is switched on it should switch on fuel pump and prime.

 

That's a new one to me, thanks il try that also, got a few more things to try again fingers crossed!

 

Lee had the same issue a couple of weeks ago replaced the crank sensor and she fired up.

 

lee are you getting the right resistance at the injectors to keep them opening and running

can you here them clicking?

 

It's a new weber marreli one but could be faulty so will try the original. Thanks.

 

Havnt checked the resistance james just used a noid to see if I was getting a signal which I am. I'm starting to think that for some reason although the injectors are fireing their not squirting enough fuel in even tho I have good fuel pressure and a tank full of fuel?

 

worth trying lee ,as the injectors wont enough open with the proper current


are they new injectors?,just wondering are they the proper impedence for the ecu

 

What exactly has been changed since the last time it was running? Wasted spark board swapped? Loom change?

 

Fart near a old loom it will stop working.

Lee still think its fuel pressure related mate.

 

Lee have you tried the fuel cut off in the boot?

 

Yeah new injectors from msd so assume their the right impedance!

 

Had an engine fire but loom wasn't damaged, all connection have been disconnected and inlet off but other than that nothing else taken off. The loom is the original that I am going to replace eventually just wanted to get it up and running again for now.

 

I'm having my suspicions about the loom! Going to check through it all again.
Iv now tweaked the fuel pressure up to 40psi but still no good

 

Bypassed that years ago due to it giving me grief! Lol

 

is their anyway the fuel rail could be blocked lee?

 

Not sure anything is possible but it was fine before. I'm going to go through the lot again start from scratch then if can't get any joy il take it to a specialist.

 

should be 50psi ish/3.5 bar for most with vac pipe off...

 

Lee the reason I asked is I learnt the other day while having my loom sorted that the early coil pack drivers fire slightly differently, or the loom needs wiring slightly differently anyway. Try swapping the leads around 1-4 with 2-3 to see how you get on.

 

Nash, the plugs are not wet so no fuel.

Lee, How are you checking the fuel pressure?

Are all engine earths ok? plenum check with meter on ohms

Paul

 

I know he said the plugs wernt wet but anything worth a stab for 5 seconds work? Fuel lines on the right way around on the rail?

 

very true we have all been there

 

Spent last 2 days on it and still no joy!
Nash, u were right about the leads, I swapped them and it tries to start so leads were on wrong. But still not getting wet plugs, tweaked the fuel pressure to 40 psi, removed each injector and they are all fireing but removed the inlet and the fuel appears to be some how getting blown back into the inlet so the injectors seem to be fireing at the wrong time. Any ideas? Been through the timing and gaps etc over and over!

 

Lee take off the pressure vac pipe and crank I rekon the fpr is leaking fuel into the plenum via this pipe..

 

Just tried this but no fuel out of vacuum pipe?

 

Are you using std phase sensor in the dizzy?

check out this
www.bigturbo.co.uk

I am running out of ideas

 

Yeah standard phase sensor iv tried 2 now, the original and a new one.
Thanks il have a read through that, I'm also running out of ideas!

 

Why are you running it at the wrong fuel pressure.

Mark

 

Iv set fuel pressure to the manual, it has run at this pressure previously, what would u say the pressure should be mark?

 

You manuel is wrong if it says 40psi, Your chip should be set to the standard fuel pressure is 3.5bar.

Mark

 

Ok it's 40psi when I'm turning it over but with the vacuum pipe off if I could get it to run it increases to around 50 psi, it has run on this fuel pressure previously. Il try turning the pressure up a bit more, it's a wrc Bosch regulator and it's not very old so should be ok?

 

Try another regulator. I still think its leaking hence the fuel in the plenum. and the fact its below 3.5 bar 50.75 psi. can't see how the fuel from injectors would get into plenum.

How you sort it mate.

 

The problem I have is it's a wrc Bosch regulator with all -6 fittings so I'm stuck to try another regulator I do have the original but all the hoses are -6.
I'm going to have a break for a few days from it and come back with a fresh head it's been a right pain in the neck.