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Old 12-26-2011, 08:22 PM   #1
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Default Rich at light throttle is this weak coil or what

Ok So I have rich situation 10-11 at light throttle/10-20 vac situation. Like cruising at 40 or 70 or really any where I am just trying to maintain speed but not acel.
I can make it go a way by blipping the gas but sometimes it just starts back to being rich sometime it goes back to 13-14.
Mid throttle its fine. Full throttle is fine.

I have a garrett 2554 with intercooler at 10psi. Bipes. 305cc injectors and a begi fuel pressure reg that increase press as I boost.

I purchased this used so I dont have a long history of the problem but the 305cc made it worse. The thing is it seems to be intermitant. Some times it does it and other times it does not.

Could it be spark/Weak coil. I know that can be an issue on these cars.

What do you folks think?

Thanks
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Old 12-27-2011, 12:41 PM   #2
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I have replaced the stock and wideband o2 sensors.

Any ideas would be great. I am lost
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Old 12-27-2011, 12:49 PM   #3
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Opened this thread, saw that you were running on bandaids and closed it.

But since you're asking for ANY ideas: you're running larger than stock injectors on a stock ecu. There's no way its going to perfectly control them 100% of the time. I don't think you developed a problem, I think you started out with a problem. Ditch the POS bandaids, pick up a megasquirt, and you can dial in what you want the car to inject when you want it instead of trying to manipulate things and hope for the best.

Biggest issue everyone seems to agree on with bandaids is inconsistency and limited control.

Just my opinion
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Old 12-27-2011, 04:23 PM   #4
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Thanks for the reply. I agree that megasquirt would be better but I can not afford it right now. I will be doing the diypnp soon tho. My problem is the stock ecu should be able to pull fuel and even if it was not the car should not be running 10 afr at light throttle with the bigger inj under no boost. I feel like the spark is the issue.
I know that spark can be an issue stock with miatas. how do I diagnose this issue. What are the signs of this problem in a stock car?
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Old 12-27-2011, 04:36 PM   #5
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Last variable you changed is the injectors.
Swap the stockers back in and see if the problem goes away.
Pending that you will have your answer. Unless it did that on the stockers too.
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Old 05-28-2012, 07:52 PM   #6
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Old 05-29-2012, 05:27 PM   #7
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diypnp fixed this issue.
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