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Old 07-09-2007, 10:40 PM   #1
abhattan
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Default Desperately Seeking help with Lexus AFM and Injectors!!!

I just installed a set of 550cc/min injectors and a Lexus AFM. Now the car runs like crap. Sounds like a misfire at idle, almost like I have a cam in it, and it sounds like it is misfireing throughout the rpm range. While driving, it misses slightly. No check engine light. When I get on it, It will get to 5lbs normally and then shoot to 9 lbs. What can this be? Please hlep.
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Old 07-09-2007, 11:22 PM   #2
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Which KV sensor is in the Lex AFM? You need to swap in the one from your stock AFM.

Also, what brand of injectors are you running?
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Old 07-09-2007, 11:54 PM   #3
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I don't know, but I tried it with the stock one on and the lexus unit. Still ran the same way. How can I tell what's what? I heard something about a screw, what is that? As far as the injectors go, I have no idea, but they came off of his car and were fine on his car. He had them cleaned and tested then i got them. All I know, is that I didn't have to use seperate clips.
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Old 07-10-2007, 12:13 AM   #4
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It sounds like you're running very rich. Do you have a wideband? If so, what are your AFRs looking like?

EDIT: Oh, the screw is used to reduce or increase the amount of unmetered air that's let through the AFM. It's in the side and I think there's normally a cover over it. If you don't have a wideband I wouldn't recommend adjusting it.
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Old 07-10-2007, 12:31 AM   #5
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I see the screw and didn't touch it. I checked to see if all of the injectors are firing, and they are, also, no codes. Should I have to readjust my timing for this mod or anything I should be doing otherwise? I don't have a wideband by the way.
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Old 07-10-2007, 06:33 AM   #6
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Well, with no tuning your idle and low power band are going to be pretty rich. Idle will probably be real bad since I don't think the ECU monitors A/F at idle... sorry, it's late and I can't picture the entire scenario or remember all the specifics at the moment. I'll post back if I think of anything else.
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Old 07-10-2007, 11:26 AM   #7
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there is no screw really you just see the screw head
thats part of your problem . you are most likely lean and getting too much air

this site used to have pictures
http://www.supras.co.uk/resources/Mk...e.htm#Chapter3
the lexuz afm has a large bypass section allowing unmetered air you need to adjust that amount of unmetered air
it would have been good to install an air/fuel meter before so you'd have an idea where your mixture was at before

search google for "reg reimer afm screw "
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Old 07-10-2007, 09:20 PM   #8
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Thanks alot for all of your help.
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Old 07-11-2007, 01:07 AM   #9
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In the even this doesn't work you can pull the efi fuse and crank the engine to clear the old codes and the use the jumper wire and try codes again.

I know you said you had none but it may be beneficial to clear it and try it again.
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Old 07-11-2007, 01:12 AM   #10
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I tried that and still nothing. However, I did find out that the injectors were actually a littler bigger than 550cc. Somewhere around 600 or so. This is probably the reason the car is running like crap. But it does seem to be a tad bit better.
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