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Old 10-15-2014, 05:28 PM   #61
JBeachstang11
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LC-2 Wideband installed and calibrated.

Ran car from a cold start and wideband shows 18-22 AFR while Bin Ed 2012 dash is showing 12-14ish..

Car still began to smoke after 5 min.
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1990 GT 5spd

311ci Edel 6025 2.02 heads, Comp XE274HR, Comp 1.6 RR, Tubular GT40 upper, ported lower, 24# Inj, 70mm BBK TB/EGR, ProM75mm MAF A9P ECM, BBK Shortys, Hpipe etc..,

Eibach sport springs and sloppy shocks/struts..
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Old 10-16-2014, 07:00 AM   #62
mjr46
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Originally Posted by JBeachstang11 View Post

Now it has a manual computer and I know there is a wiring issue on pin 30 between the two with the neutral safety switch but I'm not sure how that would cause an idle issue.

Still stumped as the idle problem is almost the same as it was before I rebuilt the engine so it must be a wiring harness issue or a TB issue or maybe my vac tree is cracked but something has carried over, even though most of the sensors are new with the fresh engine build.

.
here's how http://sbftech.com/index.php/topic,7333.0.html
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Old 10-16-2014, 08:50 AM   #63
88 orangepeel notch
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From the time and money your sticking into this, I feel your pain lol. I'm just going to offer moral support as this ones way out of my league of knowledge.

But which AFR reading do you trust? A calibrated wideband is hard to argue with, and a mixture that lean on a cold start up says the ECM isn't getting a accurate temp from ECT sending unit. I'm just guessing here.

Also, just noticed your in Florida, there's a big difference in cold start temps that I'm used to lol. My wideband holds 13.0-13.5 at cold start up for the first couple minutes, then switches to open loop when operating temps reach normal. Then sweeps between 15.0-16.0 at idle.
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24 mpg (combined)

Last edited by 88 orangepeel notch; 10-17-2014 at 08:56 AM.
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Old 10-16-2014, 11:21 AM   #64
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Thanks for that, much appreciated!

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Originally Posted by 88 orangepeel notch View Post
Forms the time and money your sticking into this, I feel your pain lol. I'm just going to offer moral support as this ones way out of my league of knowledge.

But which AFR reading do you trust? A calibrated wideband is hard to argue with, and a mixture that lean on a cold start up says the ECM isn't getting a accurate temp from ECT sending unit. I'm just guessing here.

Also, just noticed your in Florida, there's a big difference in cold start temps that I'm used to lol. My wideband holds 13.0-13.5 at cold start up for the first couple minutes, then switches to open loop when operating temps reach normal. Then sweeps between 15.0-16.0 at idle.
See this is what I wonder as well because it starts and sounds great until after a few mins then almost like it is switching to a different map (I'm still learning how ol/cl works) then starts to load up and get super rich and begin to sounds like crap.

Also my Bin Editor dash board and datalog won't register the ECT data and just says 20.. the whoe time. Also the ACT stays at 100, like both of those aren't registering. So I need to trace them and check to make sure they aren't faulty.

Thanks for the data example of your car. I will do the recalibration of my wideband to make sure its reading correctly then proceed to the ECT/ACT issue.

Edit: Sorry, Thought I posted this already. When I did the leakdown and changed plugs Champion RC12YC the old plugs were soaked in gas and very sooty/black. Makes sense with rich smoky exhaust.
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1990 GT 5spd

311ci Edel 6025 2.02 heads, Comp XE274HR, Comp 1.6 RR, Tubular GT40 upper, ported lower, 24# Inj, 70mm BBK TB/EGR, ProM75mm MAF A9P ECM, BBK Shortys, Hpipe etc..,

Eibach sport springs and sloppy shocks/struts..

Last edited by JBeachstang11; 10-16-2014 at 12:06 PM.
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Old 10-17-2014, 09:47 AM   #65
88 orangepeel notch
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OK, I just reread this entire thread and have to say your much more patient than I am lol.

But just a couple ideas that cured some similar problems on my car. Redo all grounds if you haven't already. The 3 that I did were neg. cable to block. This was the bad one on my car. PO painted the block and never took the paint off when reattaching the ground cable. Then the one from motor to firewall, and the computer to body ground. Since this is a fresh motor, I'd assume the block connections are good, but you never know.

Also, what is your wideband showing for AFR during normal driving, then what's it at idle on a warm motor when its surging.

And one more thing, it may be time to think about smoke checking vacuum leaks. There's a sticky over at Corral on building your own, and they say it works great.

Now I'm no more knowledgeable than you at this, I'm just trying to think logically as to what is causing the surge. Seems once it goes open loop, it starts with the problems. Cold start ups are fine?
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Dyno'd 300/316, 2745lbs-track scale
Best ET………12.4@108, 1.66 60ft on 8" ET Drags.
24 mpg (combined)
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Old 10-18-2014, 03:07 PM   #66
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Originally Posted by 88 orangepeel notch View Post
OK, I just reread this entire thread and have to say your much more patient than I am lol.

But just a couple ideas that cured some similar problems on my car. Redo all grounds if you haven't already. The 3 that I did were neg. cable to block. This was the bad one on my car. PO painted the block and never took the paint off when reattaching the ground cable. Then the one from motor to firewall, and the computer to body ground. Since this is a fresh motor, I'd assume the block connections are good, but you never know.

Also, what is your wideband showing for AFR during normal driving, then what's it at idle on a warm motor when its surging.

And one more thing, it may be time to think about smoke checking vacuum leaks. There's a sticky over at Corral on building your own, and they say it works great.

Now I'm no more knowledgeable than you at this, I'm just trying to think logically as to what is causing the surge. Seems once it goes open loop, it starts with the problems. Cold start ups are fine?
Man tell me about it. I've had a a few moments I was going to sell the car or part it out. Getting to that point but I know I am right at the point of being able to enjoy it once this programming is over. AC is even super cold too!

I did check those grounds before but I will definitely do that again as I could have missed it or messed one up since.

Haven't driven with the WB yet but I will try to get a quick trip in soon and report back, thanks for that idea.

Smoke check is a great idea and I'll do that. Never now even though they look good and didn't change with carb spray. Check anyhow.

That is absolutely it. The smoking begins once closed loop takes over.

Thanks so much Orange. I'll check all these and get back.
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1990 GT 5spd

311ci Edel 6025 2.02 heads, Comp XE274HR, Comp 1.6 RR, Tubular GT40 upper, ported lower, 24# Inj, 70mm BBK TB/EGR, ProM75mm MAF A9P ECM, BBK Shortys, Hpipe etc..,

Eibach sport springs and sloppy shocks/struts..
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Old 10-18-2014, 03:07 PM
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