'85 SC "Power Loss" - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
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post #1 of 4 Old 06-13-2019, 04:33 PM Thread Starter
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'85 SC "Power Loss"

My car is a 1985 Shelby Charger. Driving home from work today, no issues. Sitting at a stop light and car begins idling around 2000 RPM. Driving down the road, 55 mph in 5th gear, everything is fine for a while, then "Power Loss" dash light turns on and car starts to buck. I didn't know what was going on, so I pulled off onto a back road and sat there for a few minutes. Car was idling around 900 RPM as normal so I continued on my way.
Got about a mile down the road when it happened again, worse. Power loss light flickering and engine choking simultaneously. Engine temperature was good, voltage never dropped. Car eventually stalled. Sat there for another 10 minutes, drove the rest of the way home, no issues.
After getting home, I checked that the distributor cap was tight, base was tight, spark plug wires all plugged in, connections on coil are good, vacuum lines all connected, and battery terminals are tight.

Any ideas?

Last edited by Newt; 06-13-2019 at 07:22 PM.
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post #2 of 4 Old 06-13-2019, 06:15 PM
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Re: '85 SC "Power Loss"

The Power Loss light comes on when a Computer Controlled System/Component has a Malfunction and its Voltages are "Out Of Range" high or low.

Check For Stored Fault Codes.

CHECKING FOR FAULT CODES
With the engine off turn the ignition key on/off, on/off, on within 5 seconds.
The power loss lamp will begin to flash, these flashes are the fault codes.
All codes are two digit numbers.
The first digit will be displayed by longer/slower flashes, then a slight pause and the second digit will be displayed by shorter/faster flashes.

IE Code 13 will be displayed by 1 Long/Slow Flash, a pause and then three shorter/faster flashes/

If there is more than one code stored they are displayed in numerical order.

Code 55 is "End Of Message" meaning the engine controller is done communicating with you.

Check for Codes and Post Back.
The Code does not indicate a component failure, it indicates a malfunction is a system/circuit that needs to be diagnosed.

Retrieving Fault Codes
https://www.turbododge.com/forums/f4...83-1995-a.html

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post #3 of 4 Old 06-13-2019, 07:00 PM Thread Starter
TD New Guy
 
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Re: '85 SC "Power Loss"

It was throwing codes 32 and 33.
Going by your list, those correspond to A/C and EGR circuits?
I am fairly certain that my car is not an A/C car, and I am not familiar with an EGR circuit, but I will look into both.
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post #4 of 4 Old 06-13-2019, 07:24 PM
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Re: '85 SC "Power Loss"

The A/C code is set because the car is non A/C equipped but the wiring is there, that code has probably been there since the car was new, it is not causing any of your problems.

The EGR valve is used to lower combustion chamber temps by recirculating exhaust gases back into the engine to eliminate NOx, it will also help prevent detonation issues.

If the car went into failure/limp in mode (Power Loss Lamp On) that could be why the car was running poorly.
Limp in Mode in the early vehicles was very crude and the car barely ran, as the controllers got smarter and more sophisticated it got a lot better, to the point that in some instances when the Check Engine Light comes on you may not even notice a problem or it will be minute.

As far as the EGR Code.
That can be caused by a faulty EGR Solenoid, Broken/Cracked/Collapses Vacuum Line, Stuck Open/Closed EGR Valve.
(A stuck open valve will create issues at idle such as stalling, hesitation, etc. but will go away when the throttle is opened and the car is moving)

'85 SC "Power Loss"-solenoids-85-87-quad-solenoid-location.jpg

'85 SC "Power Loss"-egr-solenoid-1.jpg

'85 SC "Power Loss"-egr-solenoid-2.jpg

'85 SC "Power Loss"-85-turbo-vacuum.jpg

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