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ggrecian
Joined: 20 Oct 2013
Posts: 29
Location: Pa
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 Posted: Sun Nov 03, 2013 3:40 am Post subject: 924s crank but no start |
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where do fuel injectors get their pulse from?i have fuel she there yet?to the fuel rail and spark.use noid tester i injectors.not showin any pulse?tachometer bounces when cranking...what next?
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porschelover |
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larchie
Joined: 19 Jun 2003
Posts: 297
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| Posted: Sun Nov 03, 2013 4:59 am Post subject: |
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You might find this section helpful from Clarks Garage in his Garage Shop Manual: Troubleshooting Fuel Supply Problems esp. the section toward the end of the page entitled "Other Fuel Related Problems" where Clark writes ... | Quote: | | When the fuel pressure runs too high, the fuel injectors draw too much current causing the injector drivers in the DME computer to shut down. Disconnect on fuel injector connector and attempt to crank the engine. If the engine starts, where it would not start with all injector leads connected, the fuel pressure regulator is bad and should be replaced. Disconnecting one fuel injector plug reduces the injector driver current sufficiently to get the injector drivers to fire. |
Elsewhere he writes: | Quote: | Perform the following to check for fuel injector supply voltage:Disconnect on fuel injector plug.
Turn the ignition switch to the ON position.
Check for approximately 12 VDC on the injector plug terminals. There will be 12 VDC on one plug terminal and 0 VDC on the other terminal. |
On the tach ...
| Quote: | | tachometer bounces when cranking... |
Thus, the sensors are not reversed.
| Quote: | | where do fuel injectors get their pulse from? |
See Engine Cranking / Running Signals at same source.
IMHO posts might get better response by keeping to the same forum-thread by bumping rather than by re-posting. |
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