Desperately Seeking help with Lexus AFM and Injectors!!!

abhattan · 07-09-2007, 10:40 PM

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.

cre · 07-09-2007, 11:22 PM

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?

abhattan · 07-09-2007, 11:54 PM

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.

cre · 07-10-2007, 12:13 AM

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.

abhattan · 07-10-2007, 12:31 AM

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.

cre · 07-10-2007, 06:33 AM

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.

07-09-2007, 10:40 PM	#1
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	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. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

07-09-2007, 11:54 PM	#3
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	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. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

07-10-2007, 12:31 AM	#5
abhattan 3" Exhaust Join Date: Oct 2006 Location: Brentwood, New York Posts: 162	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. __________________ '91 Turbo Targa 5 Spd. '87 Corolla GT-S 5 Spd '91 Accord Daily Driver 5 Spd Soon to be rebuilt (All to some extent)

07-09-2007, 11:22 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	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?

07-10-2007, 12:13 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	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.

07-10-2007, 06:33 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	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.