92 5.7 Weird Noise - Page 2

silverhairdeere · 04-07-2009, 03:25 PM

use a multi-metter to check if it's good sensor .

shd

stepsidejay · 04-07-2009, 03:55 PM

and if its not the SEN or the connections then where should i go from there?

stepsidejay · 04-07-2009, 07:47 PM

well guys i went and took a look at the knock sen... and there was no wires coming off of it. so i figured that was the problem!!!! took me a min to find the dang plug-in. the starter looks pretty new compaired to how dirty the underneeth is and its fairly clean. so im guessing when they changed it they unplugged the knock sen. and got the wires all mixed up, took me a while to find it and i had to cut the wire and all that... but i got it all back together and took her for a lil ride.....no rattle, noise, nothing no matter how mush i "MASH ON IT"(thats for u hot rod)!!! And it seems to be running ALOT better. one other question..the guy that pulled the code said that when the light comes on the computer changes(or something) to do whatever it does, but he mentioned that the air/fuel ratio changes!! is that true? if so...will this effect my MPG and HP?

bradrhale · 04-07-2009, 07:50 PM

when the light is on, the ecm recognizes a problem. the code needs to be cleared so that the computer may reconfigure and relearn. easy way to do this is by undoing the battery cables for the length of a good cold beverage and hook them back up.

stepsidejay · 04-07-2009, 07:59 PM

ya i know about pullin the cable, but does that erase the code or just reset it?

hotrodpc · 04-07-2009, 09:49 PM

WIth it dsconnected long enough, it should lose any codes it has in storage. OBD ll handheld code readers are really not that much these. With that, you can read and erase codes. I use and Actron CP9145 that I got on sale at Pep Boys for $89.95. Came with a nice carry case, the CD for the computer with all the codes explained etc. Not the best, but it works great and for the money I am satisfied.

hotrodpc · 04-07-2009, 09:50 PM

Doh I am getting good at assuming and confusing these posts. You are probably not a OBD ll system. OBD 1.

stepsidejay · 04-07-2009, 10:15 PM

ill have to check into that? this one ur talkin about just displays the codes and the dics explains them? so u don't need a labtop to use it on the truck?

hotrodpc · 04-07-2009, 10:33 PM

Right, I don't even use the disk. Don't need it. But it is a good source of info to read and study. Mine will give the code and explain the code or tell what it is. Like the code #, then says lean misfire, or multiple cylinder misfire, or cyl 3 misfire, O2 senosr laft bank, etc There are a bunch. The disk will just give info on what or how to check what can be wrong with each specific code. I looked at the disk when I first got it. never used it since. But, this unit will not work on your truck. Yours is not OBD ll. I did not realize it was not a 96 or newer when I responded. Some models are OBD ll before 96, but GM trucks are not one of them.

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04-07-2009, 03:25 PM	#11
silverhairdeere Senior Member Join Date: Feb 2008 Location: land between the lakes tn Posts: 1,184	use a multi-metter to check if it's good sensor . shd

04-07-2009, 03:55 PM	#12
stepsidejay Full Member Join Date: Apr 2009 Location: TEXAS Posts: 37	and if its not the SEN or the connections then where should i go from there?

04-07-2009, 07:47 PM	#13
stepsidejay Full Member Join Date: Apr 2009 Location: TEXAS Posts: 37	well guys i went and took a look at the knock sen... and there was no wires coming off of it. so i figured that was the problem!!!! took me a min to find the dang plug-in. the starter looks pretty new compaired to how dirty the underneeth is and its fairly clean. so im guessing when they changed it they unplugged the knock sen. and got the wires all mixed up, took me a while to find it and i had to cut the wire and all that... but i got it all back together and took her for a lil ride.....no rattle, noise, nothing no matter how mush i "MASH ON IT"(thats for u hot rod)!!! And it seems to be running ALOT better. one other question..the guy that pulled the code said that when the light comes on the computer changes(or something) to do whatever it does, but he mentioned that the air/fuel ratio changes!! is that true? if so...will this effect my MPG and HP?

04-07-2009, 07:50 PM	#14
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,024	when the light is on, the ecm recognizes a problem. the code needs to be cleared so that the computer may reconfigure and relearn. easy way to do this is by undoing the battery cables for the length of a good cold beverage and hook them back up.

04-07-2009, 07:59 PM	#15
stepsidejay Full Member Join Date: Apr 2009 Location: TEXAS Posts: 37	ya i know about pullin the cable, but does that erase the code or just reset it?

04-07-2009, 09:49 PM	#16
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,149	WIth it dsconnected long enough, it should lose any codes it has in storage. OBD ll handheld code readers are really not that much these. With that, you can read and erase codes. I use and Actron CP9145 that I got on sale at Pep Boys for $89.95. Came with a nice carry case, the CD for the computer with all the codes explained etc. Not the best, but it works great and for the money I am satisfied.

04-07-2009, 09:50 PM	#17
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,149	Doh I am getting good at assuming and confusing these posts. You are probably not a OBD ll system. OBD 1.

04-07-2009, 10:15 PM	#18
stepsidejay Full Member Join Date: Apr 2009 Location: TEXAS Posts: 37	ill have to check into that? this one ur talkin about just displays the codes and the dics explains them? so u don't need a labtop to use it on the truck?

04-07-2009, 10:33 PM	#19
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,149	Right, I don't even use the disk. Don't need it. But it is a good source of info to read and study. Mine will give the code and explain the code or tell what it is. Like the code #, then says lean misfire, or multiple cylinder misfire, or cyl 3 misfire, O2 senosr laft bank, etc There are a bunch. The disk will just give info on what or how to check what can be wrong with each specific code. I looked at the disk when I first got it. never used it since. But, this unit will not work on your truck. Yours is not OBD ll. I did not realize it was not a 96 or newer when I responded. Some models are OBD ll before 96, but GM trucks are not one of them.