Strange Bosch problem - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 7 (permalink) Old 02-11-2019, 02:22 PM Thread Starter
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Strange Bosch problem

I have a strange no start.
Neither cold start or run injectors are triggering.
All injectors have 12 v. All pins on computer check out. Have fule press and flow. Good spark.
I re did all ground wires. Temp sensors work. Ran perfectly turned off the next morning crank...but no start.
Any suggestions welcome.
Could a thermo time switch cause ALL the injtors to not trigger? What could affect both the cold start and the 4 run injectors to not trigger?
I am very familiar with Alfa and Bosch, but this has me stumped.
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post #2 of 7 (permalink) Old 02-11-2019, 02:41 PM
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What model/year Alfa?

- - Eric
don't read this
~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
Mebane, North Carolina


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post #3 of 7 (permalink) Old 02-11-2019, 03:12 PM Thread Starter
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1985 spider
Thanks for any help
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post #4 of 7 (permalink) Old 02-11-2019, 03:36 PM
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The Thermo Time Switch is part of the stand-alone Cold Start System. Thus I doubt a faulty TTS would prevent the regular injectors from working.

Check the link in my signature to a web site full of info about the L-jetronic system in our cars. I suggest going through all the checks - L-jet is a system - all the bits have to work properly for it to work at all.

- - Eric
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- -~ 1981 GTV-6 ~
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post #5 of 7 (permalink) Old 02-12-2019, 11:11 AM
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main relay perhaps? (the smaller one near the ecu) - one of the two pins numbered #87 is a common denominator between all 4 injectors.

The only common thing between all 4 injectors and the CSI is the fuel ecu.

was this car always a no-start in your ownership, or did it suddenly become so...?
(EDIT: oops, sorry, just re-read it happened suddenly....)

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.

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post #6 of 7 (permalink) Old 02-12-2019, 09:18 PM
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I'd check the crank position sensors.

Kevin

Currently Alfaless. Ex: 87 Verde, 86 GTV6, 67 Super, 86 Spider, 88 LeMons Verde
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post #7 of 7 (permalink) Old 02-15-2019, 06:26 AM
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I think if the flywheel sensors were bad, you would have no spark.
And you say you have spark but no fuel.

could be your '85 has the inertia switch fitted.

it will be a grey plastic cylinder contraption on the bulkhead (see photo) when they trigger the button pops up and fuel flow is cut.

try pushing the button down to reset it.
Alfa did away with them when L-Jet came out, but early L-jets still had them and were supposed to be bypassed (just tie the wire going to/from the gadget together, a Pink, I believe)

they are unreliable and can just activate going over a speed hump
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Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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