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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: segermech on October 31, 2011, 10:58:55 AM

Title: Engine Knock Ping Pre Ignition
Post by: segermech on October 31, 2011, 10:58:55 AM

Hi all,

I have a 94 sammy 1.3TBI 130,000mi and it's driving me crazy.  I have what sounds like preignition when I accelerate.

-Hot or cold does not matter
-RPM does not matter

This is what I have tried so far...

-Disabled the timing advance and retarted the timing
-thicker oil (maybe a engine knock)
-no engine codes are present
-MAP is okay  (if i disconnect it to open loop it still makes the noise)
-High octane gas.

What I might do next...

new spark plug wires
new cat converter (maybe causing the noise but it's a long shot)
engine rebuild (maybe carbon build up)

Title: Re: Engine Knock Ping Pre Ignition
Post by: Drone637 on November 03, 2011, 04:11:33 PM

That sounds like a weird one.  Can you get the noise if the vehicle isn't under load, and your just revving it up from under the hood?

Title: Re: Engine Knock Ping Pre Ignition
Post by: segermech on November 10, 2011, 09:20:02 AM

Once and a while I can get the noise when not under load but not all the time.  I thinking it's a rod bearing or something.

Title: Re: Engine Knock Ping Pre Ignition
Post by: SnoFalls on November 10, 2011, 09:39:59 AM

I'm thinking carbon buildup ...

Would be interesting to know compression numbers, and you could always try to seafoam it ...

Title: Re: Engine Knock Ping Pre Ignition
Post by: talonxracer on November 10, 2011, 10:14:00 AM

Have you taken the time to check the valve lash?

Title: Re: Engine Knock Ping Pre Ignition
Post by: segermech on November 10, 2011, 11:16:03 AM

I have checked the valve lash it's good.  Carbon buildup is an option but I did seafoam it and it made no difference at all.  The compression is 150psi in all cylinders a little low but should still be okay.

What should I try next??

Title: Re: Engine Knock Ping Pre Ignition
Post by: SnoFalls on November 10, 2011, 11:48:08 AM

Are you sure it's a pre-ignition "ping" ...

My chevy 2500 had a rattle from a loose heat shield that would "ping" only under acceleration (motor torque would shift things just enough to "ping"). I only managed to find it when one day it was off-camber and would "ping" sitting at idle.

Title: Re: Engine Knock Ping Pre Ignition
Post by: segermech on December 21, 2011, 05:12:37 AM

Found it!  It was a cracked piston.  I caught it in time so I'm able to rebuild.

Title: Re: Engine Knock Ping Pre Ignition
Post by: Drone637 on December 28, 2011, 06:59:27 PM

Lucky.  :)