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Replaced ignition switch...car still won't start. Need advice.

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Old 04-25-2008, 07:32 AM   #1
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Default Replaced ignition switch...car still won't start. Need advice.

1989 Audi 90Q. Ran fine until I went to start it a few days ago. Key turns, fuel pump turns on, engine OK light comes on, etc but starter won't crank. Turn the key to crank - no click no nothing. Tested voltage at starter solenoid and not getting 8V at terminal #50 from switch when turned on. Suspect faulty wire but I find it hard to believe a wire would just fail all the sudden without any prior warning. Replaced ignition switch and still won't start. Solenoid and starter are fine because I can jump it at the solenoid. I checked the fuses and nothing blown. Am I missing something?
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Old 04-25-2008, 07:47 AM   #2
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Default so no power at starter solenoid trigger wire?

Hmm... so the connector looks fine and isn't too rusty. Start tracing it back up... look for a dead spot (perhaps it melted or shorted out).

Then, pop the fuse panel cover. Look for the 'starter interlock relay'... the quattro cars don't have a starter interlock relay, but instead, a solid wire bridge (looks like a funky copper L). Pull that out with a pair of pliers. Make sure it's clean. When inserted, I do believe this should see 12V when ignition is in the START position.

(the interlock relay is for automatic cars... if in anything other than park/neutral, it tells the relay to not let the car start. On the manual cars, they assumed you were bright enough to be in neutral or have your foot on the clutch... hence the bridge wire.)

Try that and report back.
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Old 04-25-2008, 07:59 AM   #3
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Default No power at the trigger wire. Tracing the wire tonight.

Thanks for the tip about the jumper piece. I'll test for 12V there.
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Old 04-25-2008, 08:04 AM   #4
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Default Is there a switch at the clutch pedal?

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Old 04-25-2008, 08:09 AM   #5
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Default jump out the starter, see if it starts without using the ignition

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Old 04-25-2008, 08:12 AM   #6
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Default Already tried that and it works...starter and solenoid are good

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Old 04-25-2008, 08:13 AM   #7
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Default Car was able to start with or without pedal depressed, so I'd say no.

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Old 04-25-2008, 08:48 AM   #8
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Default Check wiring schematics for relay. Could be a relay has gone bad.

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Old 04-25-2008, 09:00 AM   #9
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Default Relay sounds reasonable but there isn't one I could find in the starter system.

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Old 04-25-2008, 10:35 AM   #10
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Default 2nd... nope... only switch down there is cruise-control... and it's purely vacuum based...

you can start these cars without a foot on the clutch. No start-in-gear protection.
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Old 04-25-2008, 10:39 AM   #11
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Default Nope... only relay is the solenoid itself. Definitely sounds like it's the trigger wire...

trace it back... make sure the connection is good, and double-check the connection on the new switch. Can you get at the switch to check the connection there? (ie, test the output voltage from the switch when the wire is connected... jam a test-probe from the voltmeter in the solenoid trigger wire connection).

Done anything else that could have shorted the wire?

Hate to say it, but triple-check the female-spade connector on the solenoid trigger wire. I had a slow/no-start issue with my Scirocco (same style connections), and turned out it was just too much rust on the connection/wire. Snipped 2" off, crimped on a new connection, and everything was golden.
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Old 04-25-2008, 03:18 PM   #12
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Default fighting the same problem with a 90 CQ!

I'm going to go check for corrosion at the starter trigger wire...

Let me know if you find yours.
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Old 04-27-2008, 12:19 AM   #13
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Default How old is the starter?

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Old 04-27-2008, 12:19 AM
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1990, audi, bridge, dead, ignition, interlock, mazda, miata, nissan, pick, relay, solenoids, spots, starter, starting, suburban, switch, testing

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