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Old 06-07-2019, 12:25 AM   #1 (permalink)
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Default Car missing and running lean after injector

Well I never thought to be one of the people asking internet for help but here I am. Lol I changed my injectors to 800cc because I was running out of fuel on e85 and dr650s. I first bought a wrong set and were high impedance fuel injectors since I thought all fat body injectors are low impedance. When I put those on the car was missing and was running lean. I thought there is a vacuum leak somewhere but couldn't find it. Later I found out I got the wrong injectors. So I bought the right 800cc injectors and the car still running lean and missing. Is it possible I'm running safc or could it be something else? I know for sure I didn't drop anything down the intake to bend valves but I'll do compression test tomorrow. I have not driven the car for 5 weeks. I'm super pissed. I thought maybe safc at least would make it run rich but running lean and missing is confusing me. When I was running 650cc injectors I was at -15% on e85 and -20 on gas when idling so I thought I would have plenty of room for 800cc. What are your thoughts? Bad fried ECU? Smaller injectors (would suck since max I could run was 20psi at 113% duty cycle on 650s)? I also noticed my fuel pressure doesn't hold when I shut off the car but I have 40 psi when idling.

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Old 06-07-2019, 09:48 AM   #2 (permalink)
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Default Re: Car missing and running lean after injector

What injectors did you buy? Have you tried anything other than idle? Bigger injectors have more dead time and act way smaller than they are with an safc at idle.
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Old 06-07-2019, 10:16 AM   #3 (permalink)
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Default Re: Car missing and running lean after injector

They are denso. It misses even when I give it gas. Could it be the fuel? It's been sitting for a couple weeks. I'll drain and fill it up with a fresh set. https://m.ebay.com/orderDetails?item...d=983816059025


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Old 06-07-2019, 10:20 AM   #4 (permalink)
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Default Re: Car missing and running lean after injector

5 weeks is not enough time for the fuel to be a problem. I have let cars sit for 6 months without the fuel in the tank becoming a problem.
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Old 06-07-2019, 10:50 AM   #5 (permalink)
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Default Re: Car missing and running lean after injector

Pretty confused by your post...? What were your SAFC settings with the 650's? What are they now? If it's lean, give it more fuel...

Are you sure it's even lean? If you fouled a plug or otherwise caused a misfire, your wideband will only see the O2 in the unburned mixture, and erroneously show lean...
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Old 06-07-2019, 11:47 AM   #6 (permalink)
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Default Re: Car missing and running lean after injector

Quote:
Originally Posted by RealMcCoy View Post
Pretty confused by your post...? What were your SAFC settings with the 650's? What are they now? If it's lean, give it more fuel...

Are you sure it's even lean? If you fouled a plug or otherwise caused a misfire, your wideband will only see the O2 in the unburned mixture, and erroneously show lean...
My wideband shows lean. Like so lean to a point that it won't even show the numbers anymore and says lean. On ethanol I was around -8 with 650s. I even gave it more than that and it gets a little bit richer and then goes lean again. I have e90 in the tank if that would make a difference. Maybe I should put MAF-T and see how that works. Is it possible it's the ecu that is pulling fuel?
Plugs are brand new.

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Old 06-07-2019, 11:56 AM   #7 (permalink)
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Default Re: Car missing and running lean after injector

throw your old injectors back in and start from a clean base. If everything returns to normal, send your 800cc injectors out for clean and flow service.

agreed 5 weeks sitting is nothing.
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Old 06-07-2019, 12:10 PM   #8 (permalink)
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Default Re: Car missing and running lean after injector

Problem is I sold the older injectors already. Injectors were cleaned and flow matched by the seller.

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Old 06-07-2019, 12:17 PM   #9 (permalink)
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Default Re: Car missing and running lean after injector

which cylinder is misfirig? swap the injector and see if the misfire follows
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Old 06-07-2019, 01:38 PM   #10 (permalink)
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Default Re: Car missing and running lean after injector

It's pretty hard to see which is missing since I don't see much of drop in rpm when I pull the plugs but it seems like it's the 6th one. Same as when I had the wrong injectors. I'll test and see if I got the right injectors this time and put a MAF-T in while I'm at it.

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