Engine won't start no spark /fuel HELP - Alfa Romeo Forum
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(Post Link) post #1 of 17 Old 27-03-11 Thread Starter
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Engine won't start no spark /fuel HELP



I am seriously getting fed up with my wifes Alfa it is a cf1 alloy top 2 litre spider
I am not getting a spark or fuel from injectors turns over fine battery charged

so far

I have tested swapped crank sensor its ok
code light on off fine
fuel pump works fine fuel through to injector rail fine

now heres where it gets annoying
no fuel from injectors tested at 6v but not pulsing to 12v
no spark either
what could be the problem suggestions please
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I know that there is a fuel cut off switch under the passengers seat in my 156 - have you got something similar and has this been triggered ?
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(Post Link) post #3 of 17 Old 27-03-11 Thread Starter
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I have fuel to the fuel rail so counts out the cut out switch.
I have sent rarebear a pm re a cable as I cannot think what it can be was thinking cam phase sensor but the general feeling on here is that it should not stop it from starting but thankyou for taking the trouble to try and help as any suggestion is welcome as brainstorming is always good as throws up things not thought of
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If it is the cam sensor then it should start and run when cold and cut out when hot (if I have understood all the threads on this subject correctly)
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Quote:
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If it is the cam sensor then it should start and run when cold and cut out when hot (if I have understood all the threads on this subject correctly)
That's the crank sensor you're thinking of. A failed cam sensor doesn't affect much...it limits the revs to 3,000 rpm on ME7.3.1 ECUs, but that's about all!
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Thanks for the clarification
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sounds like a possible bad earth somewhere?
you have checked the cam belt is ok?

It wont be any sensor's except the Crank sensor (although on a CF1 the TPS sensor might be iffy) on start up.

Make sure you have the crank sensor fitted correctly as the "o" ring from the old one might still be in there, non bosch one's tend to be a little tighter to fit in too.
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(Post Link) post #8 of 17 Old 28-03-11 Thread Starter
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Hi Biffa
cam belt is fine, no O ring in crank sensor checked that, tps would I not have thought that would have mattered as I am not on the starting stage yet as no fuel from Injectors I thought of the bad earth and had a jump lead from chassis to engine coil packs but will have another look re that but must be honest in that everything else works it is getting to the stage where it will be going to ebay for a project for someone
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chances are it will be a corroded terminal on the injector relay which is causing a lack of earth. The 155's used to suffer badly with this. The relay on a 155 was round the battery area.
Not sure where it is on a spider though

Last edited by alfamender; 28-03-11 at 18:49.
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BBOB issue... Pull all the relays in and around the battery and engine bay, make sure you check the crimps and connector repair and replace any that look dodgy...

Dho just remembered the battery is in the boot...

Last edited by biffa; 29-03-11 at 12:56.
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(Post Link) post #11 of 17 Old 29-03-11 Thread Starter
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Hi Biffa
you are 100% with the earth got power to coil packs so should be ok for spark now as for the injectors if i put the earth wire to chassis i get full 12v and injector works so next thing is do you know where the common eath is for these rather than running a seperate earth to each cleaned relay but it is showing good earth there
cheers
Jason
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Check the earth on the rear of the head near the Throttle body and the one going to the gearbox...
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Did you connect the earth between the steering rack and starter motor? (The horn won't work if you didn't).
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(Post Link) post #14 of 17 Old 02-04-11 Thread Starter
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Hi
yes and no no earth strap there is this fitted just on the phase2 the horn does work though
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Quote:
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Hi
yes and no no earth strap there is this fitted just on the phase2 the horn does work though
Is there a strap between the gearbox and the chassis leg.
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(Post Link) post #16 of 17 Old 03-04-11 Thread Starter
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yep
getting closer run a new temperory earth with a long cable and I now have 12v at injector and also 12v at coil packs although it did not start as battery was getting flat sods law going to try some differant plugs and will have another go later but think that must have sorted the problem though just fingers crossed it starts now many thanks everyone for your help
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Quote:
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Hi
yes and no no earth strap there is this fitted just on the phase2 the horn does work though
Definitely fitted on a Ph1. Pretty sure it's on a Ph2 as well...
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