I dont get this fuel injection - Mustang Evolution

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Old 12-03-2013, 02:47 PM   #1
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Help. I have a 94 5.0ho mods include huge cam specs unknown.
Springs n roller rockers (1.6)
36lb injectors
Long tube headers no cats x pipe homemade mufflers. No programmer. Still has O2 sensors. But it runs really rich. Enough fuel that it bogs cackles and backfires. Only at part throttle though. Do I need a programmer? Is there a more affordable alternative?
I couldnt find a way to adjust much. I could turn down my regulator but it needs the fuel wide open.
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Old 12-03-2013, 03:03 PM   #2
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When I bought it it had cold air intake and the guy said aftermarket MAF. Idk if that would have anything to do with it. Maybe it needs recalibrated? Help! Please.
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Old 12-03-2013, 03:34 PM   #3
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Might not be calibrated for the 36's. That's kinda big for a car that's Just got a cam, albeit a big one.
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Old 12-03-2013, 03:35 PM   #4
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Would that cause it to get that much fuel?
And it runs perfect low end and top end but with the 4:10 gears I cruise at like 2700rms and it hates it
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Old 12-03-2013, 03:41 PM   #5
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It could be, but I'm not saying that's definitely your problem. Could be the cam is too big too. That can cause the drivability to decrease as well (but really not anything fuel related). Especially since you don't know the specs.
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Old 12-03-2013, 03:42 PM   #6
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It was rebuilt with better stuff. I dont think the injectors or cam are too much. But some basics have been looked over. Im just looking for where to start since I get to tear into it again. Haha
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Old 12-03-2013, 03:44 PM   #7
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Well check codes, and see what your car is saying, if anything. That might help narrow it down, or atleast before you get it tuned. Those 94-95 ecm were terrible too, so it might be in there somewhere
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Old 12-03-2013, 03:48 PM   #8
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That's why I'm here. Its throwing no codes. Not sure what the problem is there. Haha

---------- Post added at 03:48 PM ---------- Previous post was at 03:46 PM ----------

I understand it could be a million things. I was just hoping somebody had been through something similar. Really appreciate any thoughts or ideas though
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Old 12-03-2013, 03:50 PM   #9
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Ok gotcha. But just to clarify, you already checked for codes? or the CEL isn't on? Cause you can still have a code, but no CEL.
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Old 12-03-2013, 03:51 PM   #10
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Yup. No codes no cel.
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Old 12-03-2013, 03:59 PM   #11
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Ah ok then. Well, I'm guessing the ecu is the culprit, or at least half guilty....lol
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Old 12-03-2013, 04:28 PM   #12
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Why 36lb injectors?thats overkill unless you are making a drag car.thats probably the problem if you don't have heads or intake.a tune may help but personally I would get smaller injectors
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Old 12-03-2013, 04:33 PM   #13
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Idk what's wrong but would taking it for dyno tune solve this? He could possibly fix the way it runs right?
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Old 12-03-2013, 04:33 PM   #14
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Agreed, 36 lb injectors are way overkill. It's probably dumping more fuel than can be burned. Especially if the car is not programmed to have that big of an injector. Just a thought, though.
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Old 12-03-2013, 04:41 PM   #15
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I would think 24's would be good for his setup. Maybe 30's if he wants a little room to grow.
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Old 12-03-2013, 05:19 PM   #16
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Yes either would be good for growth.36 are just too much
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Old 12-03-2013, 10:58 PM   #17
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What t-stat temp. Are you running?
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Old 12-04-2013, 02:10 PM   #18
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Really low. It stays running cold. Would it be my egr?
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Old 12-04-2013, 02:19 PM   #19
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Quote:
Originally Posted by tyler k View Post
Really low. It stays running cold. Would it be my egr?
Sounds like its staying in open loop due to coolant temps not being at normal operating threshold. With it staying in open loop operation timing and fuel control are going to be off.
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Old 12-04-2013, 02:46 PM   #20
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That's what I was getting at. If your running say a 160 t-stat then its gonna run way rich. I had one for my tune but my gas milage sucked so the tuner guy said I can go up to a 180 but he wouldn't go any higher as to not affect the tune. I gained 2 mpg. Which was great for me and the exhaust didn't bring tears to my eyes anymore.
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Old 12-04-2013, 02:59 PM   #21
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Well first of all your injectors are way too big. Second of all you NEED a dyno tune with a non stock cam and there is no way around it. Third, a non stock cam with stock heads in a 94/95 car is going to likely make LESS power than the stock cam. Stock heads can't make use of anything bigger than the stock cam, all an aftermarket cam is going to do is move the powerband on you.

And if you just bought this car and its setup like this I would be VERY leery of what else is done to the car because what you are describing is someone who has 0 clue wtf they were doing and completely half assed it and then dumped it when they realized it got to be too much.
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