Ricks Free Auto Repair Advice

To diagnose a crank, but no start condition, always begin by checking the fuse to the ASD relay. Next, check for power to the ignition coil and fuel injectors with the key in the ON position. It’s common in some Chrysler vehicles for the common power in the fuel injector wiring harness to short to ground. That would pop the fuse to the ASD relay.

wiring diagram, no start, no spark, no fuel

Auto Shutdown Relay
Click for PDF

Click on this wiring diagram for a PDF of a typical Chrysler system.

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For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

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Alldata and Eautorepair are both professional grade shop manuals. You’ll find more in-depth information and more complete wiring diagrams, along with descriptions of how the systems work. And, you’ll get all that at a price you can afford. Check them out!

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Every day people write in to auto forums asking if they’ll get more power out of their engines if they use a higher octane premium gas. And I’m always amazed by the answers they get. So I’d like to straighten this out. If your vehicle requires 87 octane and you use a higher octane gas, you’re wasting your money. You will NOT get more power. Octane has NOTHING to do with power.

Octane is an additive to prevent the gasoline from igniting during the compression phase. And it slows the flame front during combustion. Octane does NOT add any ENERGY to the gasoline. Instead, think of it as a FLAME RETADRER. In fact, if you use a higher octane fuel in winter, it’ll make starting even MORE difficult.

One of the laws of physics is that gasses heat up when they’re compressed. So in a high compression engine, that heat can ignite the gasoline before the spark plug fires. That causes a flame front to start pushing back against the piston before its reached the peak of its upward travel. That pushback damages the piston and crankshaft bearings. The noise you hear during that pre-ignition is called “ping.”

To get more power out of gasoline, some engines are designed to compress the air/fuel mixture more. Those engines require more octane to prevent pre-ignition. So a 91 octane fuel burns slower and is more resistant to pre-ignition than 87 octane. And, on really high compression engines or older engines with turbos, some car makers require 93 octane.

If you put 87 octane in an engine that requires 93, the engine computer will retard timing to compensate. But there are limits to how much it can alter the timing. See this post for more information.

In the meantime, don’t let ANYONE tell you that higher octane provides more power.

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Belt Diagram 1997 Audi A4 1.8 liter engine

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Belt Diagram 1997 Audi A6 2.8 liter engine

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Belt Diagram 1997 Audi A8 3.7 and 4.2 liter engine

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Belt Diagram 1997 Audi Cabriolet 2.8 liter engine

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Belt Diagram 1997 Audi S6 2.2 liter engine

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Belt Diagram 1998 Audi A4 1.8 liter engine

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Belt Diagram 1998 Audi A4 2.8 liter engine

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Belt Diagram 1998 Audi A6 2.8 liter engine

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Belt Diagram 1998 Audi A8 3.7 and 4.2 liter engine

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Belt Diagram 1998 Audi Cabriolet 2.8 liter engine

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Belt Diagram 2001 Audi A6 4.2 liter engine

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Belt Diagram 2001 Audi A8 4.2 liter engine

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Belt Diagram 2001 Audi Allroad Quattro 2.7 liter engine

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Belt Diagram 2001 Audi S4 2.7 liter engine

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Belt Diagram 2001 Audi S8 4.2 liter engine

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Belt Diagram 2001 Audi TT 1.8 liter engine

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Equinox blower problem, no blower or intermittent operation

Many owners are having problems with melted electrical connectors that stop the flow of power to the blower motor. If your blower isn’t working or works intermittently, don’t automatically assume you have a bad blower motor. Start by checking for power with a test light at the blower motor fuse (key on). Then check for power at the red/white wire at the blower motor connector (Key on, blower set to high). If you’re not getting power, follow the instructions below. If you are getting power, then check for a failed blower motor resistor, bad switch, or bad blower motor ground.

The electrical connector that melts is located in the driver’s side kick panel. You’ll have to remove the plastic trim that covers the driver’s rocker panel in order to open the kick panel area. If you notice that the connector is deformed or shows signs of melting, you’ve found the problem. DON’T disconnect the connector—you’ll never get it back together.

To repair the problem, first remove the 40A fuse to kill the circuit. Then clip the red/white wire above and below the connector and splice in a jumper wire. Cover the splice with heat shrinkable tubing or electrician’s tape. Then reinstall the fuse and test the blower motor.

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Belt Diagram 2011 Audi A3 2.0 liter diesel engine

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Cranks but no start Chrysler vehicles

Premium gas, octane, and power

Belt Diagram 1997 Audi A4 1.8 liter engine

Belt Diagram 1997 Audi A6 2.8 liter engine

Belt Diagram 1997 Audi A8 3.7 and 4.2 liter engine

Belt Diagram 1997 Audi Cabriolet 2.8 liter engine

Belt Diagram 1997 Audi S6 2.2 liter engine

Belt Diagram 1998 Audi A4 1.8 liter engine

Belt Diagram 1998 Audi A4 2.8 liter engine

Belt Diagram 1998 Audi A6 2.8 liter engine

Belt Diagram 1998 Audi A8 3.7 and 4.2 liter engine

Belt Diagram 1998 Audi Cabriolet 2.8 liter engine

Belt Diagram 2001 Audi A6 4.2 liter engine

Belt Diagram 2001 Audi A8 4.2 liter engine

Belt Diagram 2001 Audi Allroad Quattro 2.7 liter engine

Belt Diagram 2001 Audi S4 2.7 liter engine

Belt Diagram 2001 Audi S8 4.2 liter engine

Belt Diagram 2001 Audi TT 1.8 liter engine

Equinox blower problem, no blower or intermittent operation

Belt Diagram 2011 Audi A3 2.0 liter diesel engine