Intermittent Starting and Power Loss 93 Cabriolet - Volkswagen Forum - VW Forums for Volkwagen enthusiasts

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Old 07-25-2017, 10:39 AM
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Default Intermittent Starting and Power Loss 93 Cabriolet

Over the last few weeks I've been having an intermittent starting problem. The car will crank and crank but not start. Sometimes it will start after cranking a long time or after multiple attempts.

Problems and Symptoms:
-Intermittent starting problems
-Sudden loss of power while driving (engine drops down to idle and won't rev up. Has trouble running at all)
-Doesn't seem to be affected by humidity
-Can go hours or a week between problems. Runs great 95% of the time

What I've done within the last year:
- replaced both fuel pumps and fuel filter
-replaced spark plug wires and checked spark plugs
- cleaned electrical connections on ignition coil

Testing I've done while having problems (using my VW service manual as a testing reference):
-Tested for fuel pressure. Pressure was good so not a fuel problem
- Checked for spark before plugs. Not getting consistent spark. Sends one or two sparks then nothing
- Checked for primary power to ignition coil (negative to ground). Ignition coil was not getting power.
- Checked resistance across the ignition coil. Fell within the specified range.

Based on my service manual I suspect it's either a bad ignition switch or wiring harness. I'm also wondering if it could be a bad computer. Any suggestions on further testing or what the problem might be would be awesome! Thanks!
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Old 07-26-2017, 08:02 AM
Keithuk's Avatar
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Join Date: Sep 2009
Location: Stoke on Trent, England
Posts: 1,866

First post normally go in introduction!!!

Its hard to diagnose problems on the web.

A 93 model you can't use VAG-COM\VCDS without you use the 2x2 adaptor.

The other thing is if it has a 109 relay which do go faulty you can crank it all day and it will never start. Its the main power relay for the ecu. You should keep a spare relay in the car just in case.

Please tell us your car spec in your signature
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