Cold start problem 1983 1.8 GTI. 5th injector?
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Engine cold, not run since last night, few pump relay bypassed, 5th injecotor removed, coil king lead earthed: Pump run for on minute engine not cranking no fuel dripping from injector.
As above but engine cranking: No fuel from 5th injector
If I put a voltmeter on the 5th injector wires and crank the engine I get about 9.5 volts for about 8 seconds (I wasn't really timing, I just wanted to check I had voltage and that it timed out).
I haven't done any cold pressure checks but as the car starts and runs fine once the initial cold start is complete I'm assuming that is ok.
I assume this is the 5th injector at fault although is 9.5 volts normal? I assume it is voltdrop because the car is craking etc.
Are 5th injectors available new?
Cheers, Matt.
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the green/white wire is the earth, which goes to ground on the engien block via the 5th injector thermoswitch. check the wire has good continuity between the injector and thermoswitch for starters, and repeat your test with the thermoswitch unplugged and a wire stuffed into the green/white wire earthed to the coolant flange.
if still nothing try earthing it to the battery to rule out an issue with the earth path thru the engine if you get me
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I checked things through and come to the conclusion that the injector was faulty. I have fitted a 2nd hand replacement and it fires straight away from cold again now. It's strange how the cold start problem only started happening after I replaced the accumulator and I did wonder if the new accumulator was at fault!
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We all to often read nightmare posts on this subject so it's a real breath of fresh air to hear of a fairly simple fix! 😉 👍🏼
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