Service Engine Soon Light

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01-16-2012, 03:11 PM

IBrockZ

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Car: 87 irocz 305 5.0 5 speed G92 option

Engine: 305 tpi

Transmission: T5

Axle/Gears: 9 bolt 3.45 factory gears

Service Engine Soon Light

So my service engine soon light has been coming on every now and then. I was wondering can you still test for errors when the light is not on? Will they still come up?

Thx in advance.

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01-16-2012, 06:30 PM

ex-x-fire

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Re: Service Engine Soon Light

Do a search on using a paperclip to read GM codes, count the flashes & watch for the pauses.

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01-16-2012, 07:01 PM

IBrockZ

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Car: 87 irocz 305 5.0 5 speed G92 option

Engine: 305 tpi

Transmission: T5

Axle/Gears: 9 bolt 3.45 factory gears

Re: Service Engine Soon Light

So will the codes come up even tho the service engine light is not on? That's all I need to know. I can have my dad run his tester on it.

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01-16-2012, 07:24 PM

ex-x-fire

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Re: Service Engine Soon Light

Should be stored in the memory.

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01-16-2012, 07:31 PM

IBrockZ

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Car: 87 irocz 305 5.0 5 speed G92 option

Engine: 305 tpi

Transmission: T5

Axle/Gears: 9 bolt 3.45 factory gears

Re: Service Engine Soon Light

K thanks man gonna have him test it this weekend then.

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02-20-2012, 12:11 PM

cactusman92

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Car: 1991 Chevrolet Camaro Z/28 (Project

Engine: 5.0L 305

Transmission: 700R4 W/ B&M shift kit

Axle/Gears: 3.23

Re: Service Engine Soon Light

If it comes on randomly while driving at a certain speed it could be the egr valve mine did that but i pulled off the manifold and saw the whole part was blocked with carbon build up. it might just be vacuum line related too those are great places to start both of those has set my light off