pops and cracks

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12-08-2014, 07:47 PM

hotrod 5210

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Join Date: Dec 2014

Location: moncks corner s.c

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pops and cracks

I just got a 1986 irocz tpi 305 it cranks good but when i try to rev up it pops and cracks.

12-09-2014, 06:50 PM

parkers Z28

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Location: north Carolina

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Re: pops and cracks

has the car been sitting??? you need to drain out the old gas

12-10-2014, 08:00 PM

hotrod 5210

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Join Date: Dec 2014

Location: moncks corner s.c

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Re: pops and cracks

Quote:

Originally Posted by parkers Z28

has the car been sitting??? you need to drain out the old gas

It been sitting about a year i will drain the tank and try new gas thanks for the help

12-21-2014, 07:29 PM

hotrod 5210

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Location: moncks corner s.c

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Re: pops and cracks

Does anyone know what code 42 is

12-22-2014, 07:28 AM

Injuneer

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Join Date: Nov 1998

Location: Hell was full so they sent me to NJ

Posts: 70,646

Re: pops and cracks

DTC 42 on an 86 IROC is "Ignition Bypass Circuit Error". Appears this is a problem with spark timing, and could be related to the ignition control module. Not sure though.

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