I havent ever managed to get a straight answer from anyone at the other forum, so I am hoping there are some people here that may be able to shed some light on this problem I am having.



Under heavy throttle, somewhere around 3000-4000 there is one solid PING. Its VERY noteciable, and VERY random, but always in the 3k-4k range.



I have regrounded the ECU/Boost sensor/Engine, in hopes that it was the 3800 RPM stumble, but that was no good. I am going to purchase all BUR9EQ plugs today, and replace my plugs (which barely have 1k on them.) I have an SAFC, that I have tried to compensate for this ping by adding fuel. No good. Mods are in my sig, and believe me, I am way into 10 PSI by the time I hit 2000-2500.



Any help is GREATLY appreciated!



Jarrett

what are intake temps and timing like at this moment?

maybe its a misfire

Intake temps are well within normal range, and timing had been retarded in order to try to solve this problems. Probably 2-3 deg retart at the moment.



Jarrett

VOSKO!!



Damn I miss you.... https://www.nopistons.com/forums/pub...O_DIR#>/11.gif I need to get out to other FC forums more often.



I dont think its a misfire. It sounds like a midget taking a ballpeen hammer to my block.



Only one, only under high load, and only at 3000-4000.



I have some theories, one being that I am generating too much boost at that area (I am well at or above 10 PSI at that range). Or possible I have a lazy injector. Or bad plug. Whatever it is, its VERY noteceable, and all I have consulted that run the same setup I do, do not have this problem. Very perplexing.



Just wondered if anyone here has encountered this before?

I honestly think that its a secondary lazy injector. Its knocking at the transition point

i do have an idea..... maybe your staging is off your running out of primaries ????



sandors car did that and was going lean he was using 550/1000's



i think he went to 800/1000 and it fixed the problem

Good point. Also, injector may be fine, it could be wiring associated with the injector(s).



Had a car with a ghetto rigged fuel pump switch wired into the EGI main fuse by the PO, shitty switch, tiny gauge wire, all sorts of strange problems resulted from it. Some of which were stumbling at that transition, then ultimately it would get so bad random dying ocurred. Was trying to pull too much current through these small wires that were ran to the stupid switch.

550/720 is not too off mr.vosko sir. (if the stock primaries are 550 if i remember correctly)

true, the aftermarket pump that he's got might even stress the stock wiring for all we know https://www.nopistons.com/forums/pub...#>/biggrin.png