I've read and just want to verify... Is it true that using anything lower than an 91 octane tune with Delete plates (and a JLT CAI) will cause this chatter? The reason I ask is at lower rpms, under heavy throttle I'm getting a little bit of a plasticky sounding chatter. It goes away above about 3 or so thousand rpm but I want to be sure thats what it is. I do have a 91 and 93 octane tune.... but only had just filled up (from an almost empty tank; about 35 miles till empty) with 93 octane once so wanted to wait until about half a tank before loading the 93 race tune (Do you think that filling her up now with 93 will be safe? she's about about 3 quarters of a tank). Also, if indeed this is what is causing the chatter... am i doing any damage? I've only been driving it for about 4 days... and have only gone WOT about 3 times since. All responses are appreciated!
I'm here ... Are you sure it's not spark knock? I'd fill it up with 93 now and keep the 91 tune and see if it stops. Also, did you disconnect that wiring harness from the IMRC motor? If not, you should.
Spark knock?.... Please tell me more... That just sounds bad. And I must say I thought I left the connection unplugged but I did actually reconnect it. I have now disconnected it. Could that have done any harm? I was assuming (bad idea) that it wouldn't have any effect.
... Now I'm starting to worry . I haven't tried WOT since disconnecting the IMRC connection on the back of the plenum. I will do that today. I am also going to verify that I did indeed load the tunes correctly (not 93 in all three slots) and once I've done all that I may go ahead and throw a can of seafoam in the tank just to make sure there's nothing fishy going on in there. Other than that I really have no idea what I could do/check. I don't throw an engine or wrench light, and under regular acceleration everything seems to run great. Only from about 1000-3000 range, under heavy load, is there any kind of sound. I must say the sound isn't real loud and obnoxious, but it is loud enough to hear over the motor (barely, my girlfriend struggles to hear it) but I know it wasnt there before. Now I could just be imagining it but after filling my tank up the remainder of the way with 93, and then loading my 91 tune (i was using a 87 performance tune, that should have been taking the plates and cai into consideration), it kind of sounds like it got a little quieter. Like I said though, I could be imagining it and either way it is still there. As i said before, ANY help is appreciated . I really don't want to return to stock just 5 days after spending almost 4 hours putting on the plates and CAI just to take it to the dealership for them to tell me sorry, we can't help without you paying 1.2 billion dollars, and selling half of your soul, a fourth of which will be returned after full payment has been received.
Spark knock?.... Please tell me more... That just sounds bad. And I must say I thought I left the connection unplugged but I did actually reconnect it. I have now disconnected it. Could that have done any harm? I was assuming (bad idea) that it wouldn't have any effect.
Spark knock is pre-detonation. It would be more of a pinging sound. As for the harness, no it wouldn't hurt anything. I thought maybe it was still activating the IMRC motor
Quote:
Originally Posted by JMCSD
... Now I'm starting to worry . I haven't tried WOT since disconnecting the IMRC connection on the back of the plenum. I will do that today. I am also going to verify that I did indeed load the tunes correctly (not 93 in all three slots) and once I've done all that I may go ahead and throw a can of seafoam in the tank just to make sure there's nothing fishy going on in there. Other than that I really have no idea what I could do/check. I don't throw an engine or wrench light, and under regular acceleration everything seems to run great. Only from about 1000-3000 range, under heavy load, is there any kind of sound. I must say the sound isn't real loud and obnoxious, but it is loud enough to hear over the motor (barely, my girlfriend struggles to hear it) but I know it wasnt there before. Now I could just be imagining it but after filling my tank up the remainder of the way with 93, and then loading my 91 tune (i was using a 87 performance tune, that should have been taking the plates and cai into consideration), it kind of sounds like it got a little quieter. Like I said though, I could be imagining it and either way it is still there. As i said before, ANY help is appreciated . I really don't want to return to stock just 5 days after spending almost 4 hours putting on the plates and CAI just to take it to the dealership for them to tell me sorry, we can't help without you paying 1.2 billion dollars, and selling half of your soul, a fourth of which will be returned after full payment has been received.
Try the seafoam and reload the tune. Could also be a problem with that particular tune.
Spark knock is pre-detonation. It would be more of a pinging sound. As for the harness, no it wouldn't hurt anything. I thought maybe it was still activating the IMRC motor
I've loaded the second tune (the 91) and the sound is still there, so if it is a tune problem, its across the board there (maybe the 93 octane tune will be better?). And no, it's not really much of a pinging sound. I mean it's rather low pitched, not really metallic sounding at all.
Try the seafoam and reload the tune. Could also be a problem with that particular tune.
As i said i've reloaded a new tune so i don't necessarily think it was a bad upload of the tune, but maybe while i was taking the intake off i knocked a little dirt into the intake. I tried my hardest to stop this from happening but i'd be naive to say it definitely didn't. Would some small amount of dirt in the intake do major harm? Or cause these kinds of symptoms? If not we'll completely remove this from the picture but i guess i'd be silly not to at least throw this into the picture. What I'm also really curious about is would knocking stop after a certain rpm? Would it not be an issue across the entire band? I guess it makes sense that it wouldn't necessarily be something that happens at all rpms but others knowledge on this far surpasses my own (deerrrr). Any and all suggestions (as stated previously) are extremely appreciated!
A little dirt won't hurt anything. Sure you didn't drop anything else down there?
Now you're going to make me doubt myself . I'm pretty confident nothing significant was dropped in there. I used a very small amount of wd40 on some paper towels to clean it all up then dropped the intake back in. Maybe for a bug flew in there for the split second i had my back turned but i mean... i think thats a little unlikely... and since i've driven several times since i'm pretty sure (please correct me if im wrong) something else would have came up by now if that was the case.
I just spoke with a local mechanic (real nice guy, worked on my brakes before) who himself said it kind of sounds like spark knock, however he does not by any means specialize in the mustang and was explaining how very often these days specific upgrades can't run well on pump gas. While i know there's a lot of truth in that statement, he was making it sound like the likely cause is bad gas. I am not sure i like this answer because i mean im running 93 (sure, it may not be great gas) but using a 91 tune (even ran an 87 tune previously) and i don't see that causing this. I wish i had a way to really verify whether its knocking or not. The guy did say next week he'd ride along and listen to let me know his opinion (i do believe he's heard spark knock before, whereas I havent) but still.... to a certain extent i'd take some of the opinions from this forum above his (especially yours STL!). Is it at all possible to verify whether it is or is not knock?
And i just spoke with Doug at Bamachips who's gonna send me some updated tunes, changed some of the timing and we'll see what happens. Suggestions are still appreciated though!
Just a question not to sound stupid but I didnt catch it in the post, was the tune setup for current mods?
Sounds like detonation issue.
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2007 Mustang GT Auto: Tillman 93 Dyno Tune, JLT CAI, Delete Plates, Borla Mid X Pipe, Borla Aggressive Axel Back, Roush Front Tower Bar, Clear Turns Signals w/ AW3157 LED Bulbs. (3.73 gears just need time to put them in)
The only gas station in Joplin MO that sells 93 is Mac's High Performance Gas. I have never used this stations gas before so it could be bad gas. Not sure.
Just a question not to sound stupid but I didnt catch it in the post, was the tune setup for current mods?
Sounds like detonation issue.
Yup. I bought three tunes from Bamachips, 1 87 Performance, 1 91 Race, 1 93 Race. All three were (or at least in my order, which Doug verified) are considering delete plates and a CAI into the equation. He's sent me some new tunes that I'm planning on loading tomorrow to see if that fixes the issue. I really didn't want to return to stock just to see if the issue continued... so we'll see. Fingers and toes crossed.
IMRC Delete plates chatter... clunking noise 
... Are you sure it's not spark knock? I'd fill it up with 93 now and keep the 91 tune and see if it stops. Also, did you disconnect that wiring harness from the IMRC motor? If not, you should.
. I haven't tried WOT since disconnecting the IMRC connection on the back of the plenum. I will do that today. I am also going to verify that I did indeed load the tunes correctly (not 93 in all three slots) and once I've done all that I may go ahead and throw a can of seafoam in the tank just to make sure there's nothing fishy going on in there. Other than that I really have no idea what I could do/check. I don't throw an engine or wrench light, and under regular acceleration everything seems to run great. Only from about 1000-3000 range, under heavy load, is there any kind of sound. I must say the sound isn't real loud and obnoxious, but it is loud enough to hear over the motor (barely, my girlfriend struggles to hear it) but I know it wasnt there before. Now I could just be imagining it but after filling my tank up the remainder of the way with 93, and then loading my 91 tune (i was using a 87 performance tune, that should have been taking the plates and cai into consideration), it kind of sounds like it got a little quieter. Like I said though, I could be imagining it and either way it is still there. As i said before, ANY help is appreciated 
. I really don't want to return to stock just 5 days after spending almost 4 hours putting on the plates and CAI 
just to take it to the dealership for them to tell me sorry, we can't help without you paying 1.2 billion dollars, and selling half of your soul, a fourth of which will be returned after full payment has been received.
. I'm pretty confident nothing significant was dropped in there. I used a very small amount of wd40 on some paper towels to clean it all up then dropped the intake back in. Maybe for a bug flew in there for the split second i had my back turned but i mean... i think thats a little unlikely... and since i've driven several times since i'm pretty sure (please correct me if im wrong) something else would have came up by now if that was the case.
