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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 12-20-2011, 09:28 AM   #1
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Non-Newb Starting Problems...

I'm in the process of tuning my car to stage 5/6; replete with deka 630's.
When it was warmer out the car started instantly and ran well but extremely rich. I left it to sit for 3 weeks or so and when returned popped a new battery and ECU in it. It cranks and sputters and sometimes chugs, but will not start and run. I put a known working ECU in and still no dice. It reeks of fuel and when I remove the plugs I can see vaporized fuel in the combustion chamber. I also have full spark and a new DIC. New CPS and new TPS.
My current theories are that I need new plugs, that water is in the gas, or the pre-injection fuel delivery map is scaled too heavily for colder weather and is thus injecting waaaaaaay too much fuel. I'm off to get starting fluid and new plugs. Will report back.
What say you wise gentlemen of an extinct brand?
-Cm
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Old 12-20-2011, 11:56 AM   #2
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"When it was warmer out the car started instantly and ran well but extremely rich."

When you factor in cold start enrichment and pre-injection, you're going from extremely rich to richer than bill gates. You need to adjust your maps.
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Old 12-20-2011, 12:03 PM   #3
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Since the stock ECU thinks that the stock injectors are still in the engine, it is keeping them open for the right amount of time but the larger injectors are putting more fuel in than what the ECU wants.
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Old 12-21-2011, 05:20 AM   #4
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When I installed the injectors in my car it would hardly idle. The tuner made a few adjustments and after about a few hours of street tuning it ran great. If you put a known good ecu that is not tuned for those injectors then you are out of luck. But since you are tuning this yourself, you will get there. Aren’t there a few tunes on ecu project that will work with those injectors that you can install, and then tweak?
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Old 12-21-2011, 12:21 PM   #5
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Forgive the dearth of background...
I got it to start right after I posted this by removing the fuse for the fuel pump soit couldn't prime. Notwithstanding, the known working ECU was also tuned for the injectors but had an injector constant of 16 instead of the 15the second one is now. REason being was that the IC of 16 made me bottom out the VE maps and it STILL didn't lean out.
Anyway, the warm up is lumpy and it kinda chugs here and there, but once it warms up it runs decently.
And regarding the tunes on ECU project-most are for 234 engines, and those that aren't have major holes in the programing that makes them a dubious source (Eg the transients, warm up, enrichment, and pre-injection maps are all stock, as are the battery correction tables=heinous newbie error)
Thanks, I'll keep y'all posted,
-Cm
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Old 12-22-2011, 04:27 AM   #6
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Quote:
Originally Posted by Cm452 View Post
Forgive the dearth of background...
I got it to start right after I posted this by removing the fuse for the fuel pump soit couldn't prime. Notwithstanding, the known working ECU was also tuned for the injectors but had an injector constant of 16 instead of the 15the second one is now. REason being was that the IC of 16 made me bottom out the VE maps and it STILL didn't lean out.
Anyway, the warm up is lumpy and it kinda chugs here and there, but once it warms up it runs decently.
And regarding the tunes on ECU project-most are for 234 engines, and those that aren't have major holes in the programing that makes them a dubious source (Eg the transients, warm up, enrichment, and pre-injection maps are all stock, as are the battery correction tables=heinous newbie error)
Thanks, I'll keep y'all posted,
-Cm
You should talk with John because I'm pretty sure he had the same issues with maps in regards to warm-up, he may be able to set you straight on these parameters.
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Old 12-22-2011, 11:01 AM   #7
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I've thought about it, but I think I'll try a little more and see what I can do.
It really is just a matter of spending the time(not to belittle jzw's tuning prowess) and working through the maps.
With Christmas being right around the corner I've been a touch distracted, so I'll probly go at harder after.
-Cm
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Old 12-22-2011, 01:00 PM   #8
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The car will not run nicely with IC of 15. Ran the car with older ECU with IC of 16 and when lambda is disabled it runs very well. Then again, I keep screwing myself with variables... in my haste and excitement I accidentally wired the ECU upside down when I was programming it, so 15vdc went to #70 pin side instead of the #1 pin side. The working ECU may also be tweaked because I wired the ground into the signal input ( in my defense, who makes ground grey?)

In reading this it would seem that tying my shoes is the first victory of every day, but alas, I have been struck by "when it rains, it pours" syndrome.
Any pointers would be greatly appreciated,
-Cm
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