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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Macaroni_Sackaroni on October 31, 2016, 12:56:11 pm

Title: compression test disabling fuel and spark. need quick help
Post by: Macaroni_Sackaroni on October 31, 2016, 12:56:11 pm

never did this before.
want to make sure im doing this right, im getting a little confused b/c the motor was swapped kind of weird on the truck.

fuel pump relay found inside cab. going to disconnect this.
(http://i1380.photobucket.com/albums/ah193/balls2dawall/IMG_0641_zpsbmyvwxwh.jpg)

and the thing with the red wire coming out of it, is the igintion coil and if i disconnect the red i disable the spark?
(http://i1380.photobucket.com/albums/ah193/balls2dawall/IMG_0646_zpscpuqddsy.jpg)

then i should be good to do the compression test.

Title: Re: compression test disabling fuel and spark. need quick help
Post by: LTZ C20 on October 31, 2016, 01:40:44 pm

Yea that will work fine. Or pull the fuel pump fuse.

Title: Re: compression test disabling fuel and spark. need quick help
Post by: Macaroni_Sackaroni on October 31, 2016, 01:48:01 pm

Quote from: LTZ C20 on October 31, 2016, 01:40:44 pm

Yea that will work fine. Or pull the fuel pump fuse.

 cant actually find the fuel pump fuse. i checked under dash nothing labeled fuel pump and nothing under hood. just a few random fuses next to the relay that are unlabeled. i suspect one of those are but i wouldnt know how to figure it out.

Title: Re: compression test disabling fuel and spark. need quick help
Post by: LTZ C20 on October 31, 2016, 05:32:59 pm

Then pulling the relay is fine. It's the same affect.

Title: Re: compression test disabling fuel and spark. need quick help
Post by: Macaroni_Sackaroni on October 31, 2016, 06:06:32 pm

Quote from: LTZ C20 on October 31, 2016, 05:32:59 pm

Then pulling the relay is fine. It's the same affect.

yup. cool thanks