besides the head-firewall ground, block-battery ground & the body-battery ground, are there any others?
ground points...
- Thread starter rakkasan
- Start date
Thanks tissimo. After talking with Aaron, we've both concluded that I have a bad ground somewhere. I'm breaking up once the boost comes on heavy (@ 4k rpm) but eventually the break up quits (after 5k rpm). I think I have it figured out though. I painted my engine bay & I think that it's not allowing a good ground at the body-battery point. I'm going to sand it down tomorrow & see if that helps....
OneJSupra said:
Cool, I saw the generic ones on Ebay & the Painless Wiring set that Summitt offers. I'm undecided as to which one I want to use. I mean hell, it's just wire, it's not that complicated....
I'd previously replaced both the alternator & the battery. I had the new alt checked today & it's putting out 14.3 volts, so it checks out great. The battery passed with flying colors too.
As for the symptoms, at around 4k rpm in 3rd gear, when it starts hitting full boost, the motor sputters & continues to do so until the motor hits about 5k rpm, then it pulls like a champ up to the red line. The same symptoms occurs in 4th & 5th gear, only lower in the rpms. When it sputters, the parking brake light warning light, tail light warning light & the battery warning light light up, then turn off when it pulls strong again.
I have followed Aarons advice by checking the battery ground by placing my altimeter between the intake manifold & the negative battery terminal. There doesn't appear to be any current between the two, so it appears to be grounded correctly.
Is there any other advice that can be offered? I'm fairly certain that it's a grounding problem, but I honestly suck at electrical problems so I'm really swinging the problem solving bat with a blind fold on. I'm hoping that putting an aftermarket grounding kit will solve the problem...
Mark: Often breakup around Tq peak is caused by spark blowout try dropping the plug gaps a bit and see if it improves.
IJ. said:
True, but wouldn't continue to get worse as the rmps increased? I ask because the sputtering stops around 5k to redline.
IJ. said:Nope as I said "around Tq Peak"
Ahhh, I'm with you now. I'll give that a shot tomorrow....
Drop em 5 thou and see how it goes if it improves do you have anyway of manipulating timing? ie: Standalone?
IJ. said:
Will do. I'm running Emanage Blue which is supposed to have both timing & injector control, but honestly, I haven't learned enough about it to say for sure how to manipulate it or how it works. I'm about to start a thread to get more advice about the setup I have because I can't find much about it on the web. My car is running incredible rich according to my wideband, 10.0 A/F at best (lowest reading a LC-1 is 10.0, so who knows how rich it really is), so I want to figure out the emanage asap....
BTW, why did you ask about timing before I went on my tirad? :biglaugh:
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Well if dropping the gap improves it (it probably won't cure it) you can crank some more timing in around the stutter and this "should" totally cure it
IJ. said:Well if dropping the gap improves it (it probably won't cure it) you can crank some more timing in around the stutter and this "should" totally cure it
LOL, you recommend things like I really understand what you're talking about. :biglaugh: I still have a lot to learn....
OK, new plugs (6097's set at .028 gap), same problem. I thought that the stumble only occurred between 4k & 5k rpm, but it occurs whenever there's a load on the motor / 10+ psi boost. Bad ground somewhere?
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I have the EXACT same problem man...it's been bad....very annoying...somedays it's worse than others.... feels like a misfire..
But I noticed something today....
my car pulls smooth as hell when I have the silencer in. I have a greddy boost cut controller from an SW20 MR2.....and I think it's calibration might be a bit off or something...because mine stutters right around the factory boost limit. I've tried all kinds of things. Check my coils, I completely redid all the wiring by the fusebox, and got some really nice battery terminals (they were causing some of thier own problems) and it didn't help. With the silencer out, it does it, with it in, no stutter...I'm monitoring with a W/B and EGT and there's nothing out of the ordinary.
So When I get my SAFC installed this weekend, I'm going to start messing with the BCC. (I've messed with it before, but realized that was a very bad idea without some sort of fuel control...turn it one way, you get boost cut back, turn it the other way, car goes waaayyyy lean.)
I think my BCC is the culprit and I think I can tune the problem out by adjusting the BCC and then adding fuel.
The reason I took so much space posting this is because you're using emanage and I know it has a BCC built into and it makes me wonder if the settings just need to be tampered with.
From what I've seen, most people aren't having this issue, but I've got intake, Y-pipe, no cats, RSR GTII exhaust, and a blitz LM 4" thick intercooler...and it creeps pretty good. I had to get the BCC because I couldn't even drive the car without the silencer in the exhaust because it would go straight up and hit fuel cut. Now, with no boost controller, it hovers around 15 or so PSI at all times...
so yeah...take what you want out of that post, that's just my opinion of what may be wrong with my car and your problem sounds EXACTLY like mine now...and I wanted to throw this out there because when I searched, all I found was people telling me to check for cracked coils and boost leaks...niether of which are my problem.
I will also be making a grounding kit for my car just in case....it certainly can't hurt anything!
But I noticed something today....
my car pulls smooth as hell when I have the silencer in. I have a greddy boost cut controller from an SW20 MR2.....and I think it's calibration might be a bit off or something...because mine stutters right around the factory boost limit. I've tried all kinds of things. Check my coils, I completely redid all the wiring by the fusebox, and got some really nice battery terminals (they were causing some of thier own problems) and it didn't help. With the silencer out, it does it, with it in, no stutter...I'm monitoring with a W/B and EGT and there's nothing out of the ordinary.
So When I get my SAFC installed this weekend, I'm going to start messing with the BCC. (I've messed with it before, but realized that was a very bad idea without some sort of fuel control...turn it one way, you get boost cut back, turn it the other way, car goes waaayyyy lean.)
I think my BCC is the culprit and I think I can tune the problem out by adjusting the BCC and then adding fuel.
The reason I took so much space posting this is because you're using emanage and I know it has a BCC built into and it makes me wonder if the settings just need to be tampered with.
From what I've seen, most people aren't having this issue, but I've got intake, Y-pipe, no cats, RSR GTII exhaust, and a blitz LM 4" thick intercooler...and it creeps pretty good. I had to get the BCC because I couldn't even drive the car without the silencer in the exhaust because it would go straight up and hit fuel cut. Now, with no boost controller, it hovers around 15 or so PSI at all times...
so yeah...take what you want out of that post, that's just my opinion of what may be wrong with my car and your problem sounds EXACTLY like mine now...and I wanted to throw this out there because when I searched, all I found was people telling me to check for cracked coils and boost leaks...niether of which are my problem.
I will also be making a grounding kit for my car just in case....it certainly can't hurt anything!
I've ordered a grounding kit, so that will do nothing but help. I'm in the process of getting the A/F under control. Between those two items, it should take care of the problem.....I hope.
rakkasan said:
let us know when you get it put on! I want an update! lol. I will hopefully have the SAFC in this weekend to test out my theory...together we can get this figured out...it's probably something stupid anyways...it always is with these cars....