CEL question!

by **shocar4** » Mon Jul 24, 2006 9:25 am

hey guys i have a few ?'s for you! first of all last week i got home and shut my door and heard this rattle...long story short....it was my exhaust!! i have a greddy and there is a small tubular piece that runs down the middle of the exhaust (if you look in the tail pipe) that had fallen off and was rattling around!!! so i grabbed it with a pair of needle nose! now my car has a little deeper tone...will this cause any problems....i'm going to try to reinstall it somehow! then lastnight i washed the lara and put it away! this morning i get it out, drive it about five miles and i get a cel! all of a sudden, i have limited power....65mph max! so i stop and reset the battery for a minute and the cel went off so i went straight home and parked it.....now it runs great! if i get another cel i will run the codes, but does anyone have any clue what it might be....visually everything looks great under the hood....help!!!

by **shocar4** » Mon Jul 24, 2006 10:51 am

anyone have any ideas?

by **Wang2k** » Mon Jul 24, 2006 10:55 am

u blew a knock sensor. sorry

were u running 5.5psi?

by **Wang2k** » Mon Jul 24, 2006 10:57 am

hmm, if it stays off for a long time though it isnt

u should have ran the code the first time if you wanted to know what it was for sure.

by **shocar4** » Mon Jul 24, 2006 11:02 am

no i wasn't running 5.5...would that clear up like that by resetting the computer for a minute? where are the knock sensors and how do you know which one you blew?

by **shocar4** » Mon Jul 24, 2006 11:03 am

Wang2k wrote:hmm, if it stays off for a long time though it isnt

u should have ran the code the first time if you wanted to know what it was for sure.

yeah i was on my way to work and just wanted to get it back home so i tried resetting it and it worked fine all the way home....about 15 miles!

by **Wang2k** » Mon Jul 24, 2006 11:08 am

i think how long the cel stays off varies between cars. I have heard of people driving around with it off but when mine blew i would reset the battery and as soon as i was rolling good it would come on. if it stays off ure lucky, and if it comes back on get the code it will tell you which one it is. Bank 1 is the back and bank 2 is the front

by **SC V6** » Mon Jul 24, 2006 11:30 am

I bet its a knock sensor... because 5 PSI isn't for the stock fuel system... I bet if it is a knock sensor it will be back on within 50-75 miles

by **Wang2k** » Mon Jul 24, 2006 3:02 pm

damn dude he doesnt have a stock fuel system 190 pump injectors ss ftc read man

by **shocar4** » Mon Jul 24, 2006 4:21 pm

well i guess that i will drive it tomorrow and see how it does! where is the knock sensor located? how hard is it to change on a sc'ed engine?

by **Wang2k** » Mon Jul 24, 2006 4:45 pm

the knock sensors are under the lower intake, in the v of the block. so remove supercharger, remove lower intake.

BTW the search funtion will teach you alot. everybody goes through this at one point. i personally have had success wiring my front sensor to both inputs on the ecu. I believe that the supercharger sets off the sensor from time to time retarding timing and killing power. so with the front one being further away(not directly underneath it) i get more advance and therefore power. I run very high octane fuel(airstrip cocktail) mixed with 93 so i wont detonate.

by **SC V6** » Mon Jul 24, 2006 4:54 pm

Wang2k wrote:damn dude he doesnt have a stock fuel system 190 pump injectors ss ftc read man

the SS isn't tuned.. so its basically stock.. think man

by **Wang2k** » Mon Jul 24, 2006 5:03 pm

just swapping pumps solves the fuel starvation problem, along with jims upgrade. running 5.5 measly psi only requires these mods. and y isnt it tuned anyway? who is wasting their ftc? Ill bet it is doing something or it wouldnt be on there.

by **shocar4** » Mon Jul 24, 2006 6:35 pm

Where is the front knock sensor located? Does anyone have a picture? Thanks.

by **Wang2k** » Mon Jul 24, 2006 6:48 pm

UNDER THE LOWER INTAKE in the v of the motor. its an easy fix and the gaskets are reusable. you cant see it until you take off the manifold.

CEL question!

CEL question!

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