C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

burn off module? whats this

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Old Aug 16, 2004 | 05:37 PM
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Default burn off module? whats this

what is a burn off module? how to test to see if it is bad? and where do i buy a new one? thanks erik...
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Old Aug 16, 2004 | 07:37 PM
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Burn off relates to cleaning the MAF wire. When you turn off the engine, the ECM will activate a relay to burn any foreign matter off the MAF wire. Never heard of a "burn off module". Just a burn off relay. Maybe the 85 does it differently?
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Old Aug 16, 2004 | 07:40 PM
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Originally Posted by 85autoxr
what is a burn off module? how to test to see if it is bad? and where do i buy a new one? thanks erik...
with previous poster!

The MAF has two relays ( they are identical) one powers the MAF and the other does what he said after you shut off the engine! The relays are cheap and easily replaceable!

But why do you think you have a "burn off problem"?

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Old Aug 16, 2004 | 08:06 PM
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On the 85 Vette its behind the bread box. and there is only one. $900 for a new one.
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Old Aug 16, 2004 | 08:18 PM
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Here is a picture of it.. Not the one with th arrrow.. But behind where the bread box goes..

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Old Aug 16, 2004 | 09:24 PM
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i am getting a code for a bad maf and another member said i should replace burn off also..do you agree? or no?
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Old Aug 16, 2004 | 09:28 PM
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I would change the MAF. That is usally what goes bad.
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Old Aug 16, 2004 | 10:20 PM
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I said in the other thread that it can be either one, the 85 DOES NOT have 2 relays like other years folks.

The Burnoff module is hidden behind the pass. side dash in 85, and in 85 ONLY. Thats why its so expensive.

Youll have to check the MAF itself, before you do anything.
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Old Aug 16, 2004 | 10:23 PM
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Autoxr,
I have a spare maf you can test with if you need to know if that is your problem.
Jim
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Old Aug 16, 2004 | 10:27 PM
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Originally Posted by 85autoxr
what is a burn off module? how to test to see if it is bad? and where do i buy a new one? thanks erik...
it is 85 only and it was used prior to the later 2 relays.... it is also used on F bodies with the 305tpi I beleive. You can check it out by having the MAF sensor intake hose off and after shut down view the wire, it should glow red, you have to do this quickly, a helper shuting the engine off and you viewing it...
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Old Aug 16, 2004 | 10:50 PM
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One can typically find a '85 burn off module on ebay for around $25 or so. That's how I got two spares...total about $70 with shipping.
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