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

Had the same problem when I was running 550/550s. I swapped to the 720s (secondaries) and the problem remained. I think that rules out the lazy secondary.



Jarrett

I considered this too... Possible that the PSI range in the primary area (before 3800) is too high for the pressure (10 PSI).



I am currently looking for an acceptible replacement. Possibly the greddy 720s. Anyone have experience with them?



Jarrett

now i'm guessing





FCD faulty?

Well, for one ping only? I dont think so. Although I can re-adjust it if you think that could be a culprit. I am kinda grabbing at straws right now.



I was always under the assumption that the primaries could supply enough fuel for 10 PSI, but from what Vosko is saying, maybe not. I wish I could get to a dyno, but even if I replicate the problem on the dyno, I am still risking the possibility of another ping. And that one might be my last.... https://www.nopistons.com/forums/pub..._DIR#>/sad.png





Thanks all for your advice so far! I appreciate you taking the time to help me with this!



Jarrett

OK this is complete random. I don't see on your sig what kind of clutch you are running.



THis may sound weird but I had a problem like you in which i would hear a ping. I thought i was going to break the engine.



Now, are you running that crappy centerforce piece of crap as a clutch???



LOL



This was my case for the ping that wasn't engine related but it sound like it was from the engine. As soon as I upgraded the clutch, the problem was gone.



C

The clutch is the ACT street/strip.



As of right now, I am going to replace the primaries with larger injectors. I dont necessarily think that fuel is a problem so much as I think I have a bad/lazy primary. Whatever I come up with, I will post.



Again, thanks all for taking the time to help me through this.



Jarret

Ok there goes that hunch

haha

up to what rpm? maybe you should run 720/550 instead of 550/720



mike

not that this is the cure or anything...but if your gonna upgrade your fuel system a lot like that....its not the best idea to run them off of the stock ecu with a controller.....



upgrade to a standalone, ditch the fuel controllers, and the fcd....and theres 2 things outta the way?

LOL!!



I have often thought about that, but all the research I have done seems to indicate that the HP goal I am interested in is attainable with the stock ECU. Plus, I am waiting to see how sucsessful my buddy is with emissions, and his Haltech.



Jarrett

stock ecu is a nasty fucker.....i would get rid of her asap even if you dont want to

haltec has decel enrichment = good fire out back of car :-)



i'm eventually going to ditch the stock ECU on my NA motor...that is how much of a piece of **** it is

I believe the SAFC has decell enrichment too. Just havent figured out how to use it.



Anyways....



Stuff on order or already here to try to t-shoot this problem.



Blitz 700CCs for the primary positions

AEM Adjustable rising rate FPR

BUR 9EQs all the way around

Appointment with a Dyno...https://www.nopistons.com/forums/pub...IR#>/smile.png



Jarrett

where do you setup decel enrichment?



unless you mean simply extremely high manifold vacuum cell values in the higher rpm maps, which generally only get referenced when the throttle gets closed @ high rpm... I'm not aware of any explicit decel enrichment feature, not on the e6k anyways https://www.nopistons.com/forums/pub...IR#>/smile.png



can you clarify that a bit? it does have fuel cut on decel though.

what octane are you using?? https://www.nopistons.com/forums/pub...1047683358.gif

ummm... 87!



Riiiiiiight!



I use high octane exclusively.



Jarrett

i dunno about haltec, but on mine there is a decell enrichment. I have mine set to cut the injectors back on at 1800rpm. I found 6% enrichment was a good value to use to minimize stalling. Too much or too little fuel will make your car sputter or stall when you come to a stop before it regains idle. This is specific to electromotive however, i dunno how this applies to haltec

I was thinking about good grounds to the coils, or good working coils. Malfunctioning coil can fire at the wrong time.

Kind of hard to test this, dont you think?



At idle, the timing signal from all coils is strong, and right on time.



How would you test the coils under load?

the e6k might have it, I'm sure there are menus I have not yet seen in the software https://www.nopistons.com/forums/pub...#>/biggrin.png Hopefully someone who has more experience with it can chime in.

True, but regardless are you sure they have a good ground?



I almost had an engine fire due to a power wire that rubbed though and started arcing on the power steering pulley. You would normally think I would lose spark altogether (randomly as it shorted out), but it starting detonating like a bastard and my tach kept dropping then pegging 8K, that was initially why I pulled over!

I can definately swap them, ive got more in my parts bins... https://www.nopistons.com/forums/pub...IR#>/smile.png



Jarrett

Hook up a voltmeter to the power wire to the coils and watch the meter as you drive.



I had that problem once. Turn out to me the wire was kinked and cause the coil to misfire with load.



Just a thought.

True, but regardless are you sure they have a good ground?



I almost had an engine fire due to a power wire that rubbed though and started arcing on the power steering pulley. You would normally think I would lose spark altogether (randomly as it shorted out), but it starting detonating like a bastard and my tach kept dropping then pegging 8K, that was initially why I pulled over! [/quote]

LIke he said, does your tach jump around????

Nope TACH is solid.



I can monitor the voltages though.. Not a problem, except for the fact that I cant keep road testing it for a ping! I gotta do a bunch of mods at once, and go out and see if it got fixed.



Its already been pinged about 5 or 6 times, HARD. I am getting really nervous about keeping it up. So I am going to wait till the weekend when the new injectors are installed, and the FPR is in.



Jarrett

Your very likely maxing your primary injectors and running lean. Having 720 secondaries does nothing below 3800rpm.

Which at present is the theory I am going on... But I am always open to more suggestions.



The Blitz 700 cc primaries should be here this weekend, and as previously stated, the AEM FPR is already here.



Jarrett

But you should know better than to run upgraded injectors on a 15 yr old fuel pressure regulator! https://www.nopistons.com/forums/pub...1047683664.gif The stock FPR sometimes getts too weak to support the stock injectors. I personally dont think its a coincidence that your engine pings as soon as the 720's come on. But at the same time this isnt the first time you heard this from me.

the e6k doesnt have a seperate feature for that, you can usally tune it into the map though.



mike