1993 GMC Sierra Loud Clicking On Acceleration

1993 GMC SIERRA
200,000 MILES • V8 • 4WD • AUTOMATIC
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NEURALGROOVE
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Hi there, this past winter the old girl started making this load clicking sound when you speed her up. As soon as you coast it dies right away so its when the engine is working. Its harder to hear when its idling but it seems to be coming from the lower manifold/exhaust area of the engine on the passenger side.

Also, been having battery issues and i noticed that the little green arrow lights on the cabin tempature panel are flashing (usually they point to the little person to show where the air is blowing) but its just flashes and flashes. I can't find anything in the repair manuals or online about that at all.

Anyways, new battery today, freash oil, same noise and same flashing light.

Any ideas of how to diagnose? Not afraid to get dirty or to start tearing into the engine..
Mar 13, 2010 at 4:32 PM
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AMRAAM35
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a clicking noise under load could be an engine accessory problem. An automotive stethoscope (10 bucks) can be invaluabe for narrowing down exactly where the noise is coming from. Try taking off your serpentine belt and driving a short distance to see if the noise goes away. If it did, it is likely an accessory or accessory pulley going bad. If not, it should be that your exhaust headers are leaking (since this is where you think the noise is from). Try to blow smoke towards the headers when the engine is running to see if the smoke is blow away from air leaking from the engine. However, exaust headers usually dont make a clicking noise. Clicking noises can be causes by your valve train, check that too.
Mar 14, 2010 at 2:17 PM