z28voodoo

iTrader: (2)

Well I had this problem (or one like it before) where ill be driving and all of a sudden the rpms will drop and the car will stutter, if I give it more gas it will almost die and shake violently... here is the thread before
https://ls1tech.com/forums/general-m...ng-advice.html
Anyway I changed the spark plugs on 1-11-09 and it seemed to fix the problem... Yesterday, i installed my amp and sub I got from a member on here. A small 300 watt amp and a MTX thunder form stealth box. I hooked everything up and it worked so I went inside for the night.

Now this morning on my way to work, my car is acting just like it did with the fouled plugs... what gives? could the plugs be fouled again already?? I used the highest AC Delco brand... couldnt get my hands on the NGK 55s... could it be my amp messing something up? I checked the amp power light when the car is off and the amp is off so it shouldnt be using any power right?

z28voodoo

iTrader: (2)

oh and voltage looks good. Could it be my PCM?

chevy8806

Its not the plugs that are the problem, they fouled out most likely cause of something else. If you got headers and dont have the rear o2 deleted; when the upstream o2's take a dump the pcm relies on the that cat tatel o2's to monitor engine perforamnce. Since you dont have rear o2's the pcm when in closed loop mode may be going into buttfuck(limp) mode. Also if you crimped the o2 extenders on and there is corrosion or bad connection that could cause high resistance in turn cause you car to run rich and foul out the plugs.

z28voodoo

iTrader: (2)

but it would just now start doing this? I have had the headers with no tune on for over a year and a half and have only changed the plugs once (3 months ago)

NonGoggleGuy

Have your battery & alternator tested at AutoZone.

z28voodoo

iTrader: (2)

well i called a chevy service shop just a second ago and they basically told me to **** off... cause I have headers they dont wanna mess with it... The autozone guys said it could be my coilpacks going out. My plugs and wires looked ok from what I saw.

NonGoggleGuy

Your charging system (bat & alt) can cause the same type of problem. Did you have it tested at AutoZone?

z28voodoo

iTrader: (2)

no, I checked it into the shop (which I know I'm gonna regret).. I should have though.. damn

z28voodoo

iTrader: (2)

well I got it back and they said it wasnt acting up on them at all so... then I drive it to work today and it starts stalling again... I take it back to the shop and they say its throwing 2 codes now: Crank sensor and PCM failure.. what does that mean exactly?

Is this something I can replace/fix myself? cause the shop is wanting 1000$ just for parts and then like some crazy $/hr...

thanks

NonGoggleGuy

I'd start with replacing the crank sensor.

z28voodoo

iTrader: (2)

is there some kind of "how-to" on that? or a picture showing where it is? sorry.. do you know where to buy one at?

NonGoggleGuy

It's available at NAPA for a few dollars cheaper than a dealer. I believe you have to remove the starter to get to it.

z28voodoo

iTrader: (2)

Ok, GM part #12560228, is that what I need? I looked it up on gmpartsdirect.com and sdpc2000.com

NonGoggleGuy

I'd call NAPA & tell them year, make, & model. They'll get you the right one for cheaper.

NonGoggleGuy

And yes, that is the right part.

z28voodoo

iTrader: (2)

ok thanks so much man. Now I need to find a write-up/how-to on it..

NonGoggleGuy

Here's a how-to

z28voodoo

iTrader: (2)

heck yeah! dang man you are so helpful!

oh what is the CKP sysem variation procedure and the Idle Learn procedure? I cant get the links to work on the website..

NonGoggleGuy

Try this.

z28voodoo

iTrader: (2)

damn, I dont think I can do all that.. I dont have a scan tool.. is that like a handheld tuner?