Ok. I installed my new fuel injectors today. 42.5 lb lucas injectors. I have a 3 inch pulley with kn cai and magnaflow catback. My maf translator settings are those settings that are used with the intense stage 3 kit.

Maf Base: C
Maf WOT: 1

All of the little switches are set to the correct setting as well. Now, I have the aeroforce interceptor gauge and i'm reading knock. When I get on it past 4000 rpm, I get a LOT of knock. The gauge almost reads 10. Haven't pushed it to redline yet. Does anyone know why I am getting knock and how I can fix it?

 

what octane fuel are you using?

 

uhh....10 degrees..uhhh...uh oh

 

93...uh oh is right

 

did this problem ahppen right after your mods or slowly happen

 

right when I installed the injectors....I had the stock injectors in for 2 months, and would get most 2-3 degrees of knock at redline but only took it to redline like 4 times because I was running lean. The fuel injectors were maxing out. So now that i installed the new injectors, the freakin car is getting tramendous amounts of knock now. Feels A LOT fastaer but I don't want the knock. Would I be able to change that by playing with some settings on the Maf Translator?

 

The car runs fine driving normally though. I floor it and at about 4000-4500 rpm, it starts to get knock, and just gets higher with the higher rpms

 

whats the piston rods bearings etc hold up to power wise as in are you pushing too much power for the pistons rods etc and if you not pushing enouh how close are you? u could be slowley wearing them down or it could be a fuel problem

 

So does anyone know how to fix my problem? I put 93 octane in my car all the time. Would running lean cause knock? Maybe I can richen up the fuel flow with the maf translator

 

I can't be pushing too much power....3 inch pulley intake and exhaust. This is starting to scare me.....I think I might go back to stock if I can't fix this problem

 

yea its gotta be a fuel prob then cause it dosent seem to pushing too much let me reaseqrch and get aanother veiw on this

 

I'm going to try a different gas station. I've always used Sunoco 93 but i'm going to try somewhere else now and see if that solves the problem.

 

dude, i know whats happening to your car. Your MAF tables are all F'ed up because of your intake. You need to get that car dyno-tunes asap before you blow it up... i was just at Intense and was seeing the same thing. If you put the stock airbox on, it should get a lot better.

Your MAF tables are all messed up, thus your not getting the right amount of fuel.
My car has a few more mods then you do, but i was running a 14.4:1 AFR on the dyno because the intake was messing everything up really bad... and keep in mind this was with Intense's Stage 3 PCM tune...

My car ran just fine, but lean as hell under WOT. Get on a dyno, or get a wideband and start tuning that thing.

 

I am seeing between 1-2.8 on my aeroforce gauge for knock, how do you gauge degrees of knock? all engines develope some knock, but whats the safe/unsafe limitations?

At what point does the LSJ begin the retard timing due to knock?

 

damn i need something to read knock cause i have the stage 2 with the 2.8 and step 1 colder plugs and i dont even know if i get knock

 

All because of my stupid K&N? What about if I switch my MAF WOT setting to 2? Could that help it out? And possibly set the Maf Base to like B to richen it up.

 

I can tell you, the highest i've seen was 7, i know I said 10, but just rounded it, I have hit 7 and it doesn't pull timing yet.

 

Yes, that will help you somehwhat, but you need HP tuners to see whats really going on. My Injen CAI through the MAF chart off so much, that it didnt even fall within Intense's stage 3 pcm. Scott from Intense had to rework my entire fuel charts, and some of my timing charts just because of the intake. I will make a bigger note of this once i receive my dyno charts from my Intense expeirence..

 

Thank you for your advice. I would have not known what the heck was going on if it wasn't for you guys. My gauge stopped working so I can't read my knock anymore , I richened the WOT setting to 2 (which is 4% richer) but haven't touched the base yet. I will in like 5 minutes. Once cobalt-addiction gets the hang of tuning, i'm getting a tune from them (since they are a lot closer to me then Intense is, 8 hours closer lol). If I get my gauge working tonight and it still shows knock even with WOT setting to 2 and Base setting to B or A, i'm taking off my intake tomorrow and putting back the stocker on.

 

Would cutting off the airbox on the stock intake mess it up in any way? Because I still want the loud whine but I don't want the car to be running like crap.

 

Not sure, i really don't know a lot about it myself, and ran into this problem first hand when my car was put on the dyno after intense installed my injectors and 2.8 pulley. Scott from intense knows his **** and tuned my car.

If you dont get the gage working, to where you can monitor stuff, i would put the stock airbox back on the car untill you can get it tuned. The MAF sensor is insane sensitive... so modifying the stock airbox could ulter the its reading, but im not sure to be honest w/ you.

Be carefull, no WOT pulls unless you really know whats going on.
Keep in mind rich is always better then lean... Black smoke from exhaust means your rich, and not gonna blow things up.

 

memphis, were the injectors brand new or used? There is always the possibility or a sticking injector if they were used, or getting a bad one if new....
Put the stock airbox back on and see....also you can always try an octane booster and see if it quiets down. also there is a possibility of the knock sensor being installed too tight and having it read ghost knock ....

 

I guarantee you are pulling timing if you see 7 degrees of knock. I see about 4-5 degrees of knock and it will pull approxiamtely 3 degrees of timing. Like said before, check the injectors and make sure all the switches on the MAF-t are set in the proper positions. I believe Intense has the parameters on the website. I can't believe that an intake is causing 7 degrees of knock. That is a lot.

 

Yes gotta love to play the game "Mod a car break a part" Game. The only semi safe choice to save you your sanity is leave the car as stock as possible. Too bad thats no fun though. Sorry i have no helpfull imformation for you but it sucks when you have a problem and theres no one around to help trouble shoot ain't it? Asking online is like asking a doctor to tell yuo why your sick over the phone and in mycase I know and have seen all of the problems a cobalt can get so when my boys have a problem they can as me for help but MY unknown problem hits and im screwed. But Dynos lie like a rug so even though the car feels alright trust me you aint sure unless you have a benchmark to test it against or somthig else to guage if everythings alright.

 

So you had the pulley on with your stock injectors?? You just added the larger injectors and this started? If so sounds like a issue with 1 or more of the injectors. The larger injectors should put out more fuel at the same psi of the stock injectors. Also yes lean will cause knock, so you need to be very careful. Truly if your gauge is not working I would ot be making any pulls (unless you know how to hear knock)