Lean Misfires at 2700-2800 rpm - Page 5 - 3000GT/Stealth International Message Center

DoctorDex · 10-15-2006, 02:13 PM

I've started a new thread re: my lean rear bank because I think it is a seperate issue from the lean misfires @ 2700 rpm.

http://www.3si.org/forum/showthread....26#post3978626

Declan

badass3000 · 10-22-2006, 04:07 PM

well I feel like a moron...
Seems the studder is back, I am running speed dinsity (MAPECU) so no mass.
Think ill try the ECU see what that does, mabey the LT1 bernt a hole in my ECU fuelmap?

DoctorDex · 10-22-2006, 05:14 PM

Damn. Well at least I didn't run out and by a speed density system.

My money's on the ECU. I think I'm going to send mine to AV-Pro to have it refurbished to see if this is the cause.

AudioPmp23 · 10-22-2006, 05:32 PM

Quote:

Originally Posted by DoctorDex

Damn. Well at least I didn't run out and by a speed density system.

My money's on the ECU. I think I'm going to send mine to AV-Pro to have it refurbished to see if this is the cause.

What's AV-pro, shop or individual? Do you have the web address and approx. cost for service?

DoctorDex · 10-22-2006, 07:11 PM

I believe cost is $250 and they guarantee it for life. If it doesn't work right the first time you can send it back and they'll fix it.

I think there are a few reviews of their work somewhere around here on 3si. I know for one user it didn't work, but it was attributed to some "bad code" on his board. Other reviews that I've seen have all been positive. There are pics on their website that shows what they do.

The web address is: http://www.avproecm.com/

Declan

badass3000 · 10-22-2006, 09:33 PM

funny thing is I already tried a known good ECU, but I also was using the LT1 mass.
I havent tried a known good ECU without the LT1 yet.

badass3000 · 10-25-2006, 12:02 PM

Tried a known good ECU yesterday and it didnt studder/backfire at all.
BUT the funny thing is that I did the swap in the afternoon and was driving all morning and the car was mostly well behaved with my ECU. I could get a slight studder/backfire if I tryed but it was slight. Today driving around with my ECU the stumbling was very strong.
So im not possitive but 99% sure my ecu is messed up, even though I changed caps a year ago and all was fine since then. I am pretty sure that somehow a malfuntioning LT1 mass burnt a hole in my ECU fuel map @ 2700rpm.

keithmac · 10-25-2006, 03:16 PM

I`d be tempted to pull your ECU and check all the traces around/ under the caps for continuity (especially the trace under C104), mines running faultlessly now (finally!).

DoctorDex · 10-25-2006, 05:10 PM

keithmac: What'd you have done with yours?

keithmac · 10-25-2006, 05:15 PM

I just pulled the caps, gave the board a good cleaning with a fibre pencil and rubbing alcohol, checked all suspected tracks around the ecu and replaced the caps. I`m still running the stock mas though..

Caps cured all my crappy running problems.

10-15-2006, 02:13 PM	#41 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Saskatoon, SK Drives: '91 VR4 Trader Rating: (13)	Re: Lean Misfires at 2700-2800 rpm I've started a new thread re: my lean rear bank because I think it is a seperate issue from the lean misfires @ 2700 rpm. http://www.3si.org/forum/showthread....26#post3978626 Declan __________________ '91 VR4 - Modlist: DR650R Turbos, Snow Stage 2D Alky Kit, DSM SMICs, blowthrough ported LT1 MAS, Dejon Tool intakes & y-pipe, Blitz DSBC Spec R, HKS SSQV BOV, PTE 580cc injectors, Aeromotive FPR & Filter, Hotwired Supra Pump, ek2mfg fuel loop & spacer, HKS DLI, MSD Wires, Apex'i S-AFC II, MAFTranslator, Turbobob ECU, Scanmaster III, LC-1 WBO2, ESP Downpipe, Vac/EGR delete, Gutted Precats and Test pipe, Maximal Solid F/R motor mounts, 300m 18 spline output shaft, Centerforce Dual Friction Clutch, RPS Flywheel, Powerslot slotted rotors, Goodridge SS Brake lines, Hawk Pads (front), Stillen Metal Matrix Pads (rear)

10-22-2006, 04:07 PM	#42 (permalink)
badass3000 Wanted: Traction Problems Join Date: Nov 2002 Location: Jacksonville, Fl Drives: one "badass" VR4 Trader Rating: (18)	Re: Lean Misfires at 2700-2800 rpm well I feel like a moron... Seems the studder is back, I am running speed dinsity (MAPECU) so no mass. Think ill try the ECU see what that does, mabey the LT1 bernt a hole in my ECU fuelmap?

10-22-2006, 05:14 PM	#43 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Saskatoon, SK Drives: '91 VR4 Trader Rating: (13)	Re: Lean Misfires at 2700-2800 rpm Damn. Well at least I didn't run out and by a speed density system. My money's on the ECU. I think I'm going to send mine to AV-Pro to have it refurbished to see if this is the cause.

10-22-2006, 07:11 PM	#45 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Saskatoon, SK Drives: '91 VR4 Trader Rating: (13)	Re: Lean Misfires at 2700-2800 rpm I believe cost is $250 and they guarantee it for life. If it doesn't work right the first time you can send it back and they'll fix it. I think there are a few reviews of their work somewhere around here on 3si. I know for one user it didn't work, but it was attributed to some "bad code" on his board. Other reviews that I've seen have all been positive. There are pics on their website that shows what they do. The web address is: http://www.avproecm.com/ Declan

10-22-2006, 09:33 PM	#46 (permalink)
badass3000 Wanted: Traction Problems Join Date: Nov 2002 Location: Jacksonville, Fl Drives: one "badass" VR4 Trader Rating: (18)	Re: Lean Misfires at 2700-2800 rpm funny thing is I already tried a known good ECU, but I also was using the LT1 mass. I havent tried a known good ECU without the LT1 yet.

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10-25-2006, 12:02 PM	#47 (permalink)
badass3000 Wanted: Traction Problems Join Date: Nov 2002 Location: Jacksonville, Fl Drives: one "badass" VR4 Trader Rating: (18)	Re: Lean Misfires at 2700-2800 rpm Tried a known good ECU yesterday and it didnt studder/backfire at all. BUT the funny thing is that I did the swap in the afternoon and was driving all morning and the car was mostly well behaved with my ECU. I could get a slight studder/backfire if I tryed but it was slight. Today driving around with my ECU the stumbling was very strong. So im not possitive but 99% sure my ecu is messed up, even though I changed caps a year ago and all was fine since then. I am pretty sure that somehow a malfuntioning LT1 mass burnt a hole in my ECU fuel map @ 2700rpm.

10-25-2006, 03:16 PM	#48 (permalink)
keithmac Forum Member Join Date: Sep 2006 Location: YORK / UK Trader Rating: (1)	Re: Lean Misfires at 2700-2800 rpm I`d be tempted to pull your ECU and check all the traces around/ under the caps for continuity (especially the trace under C104), mines running faultlessly now (finally!). __________________ JDM GTO TT, Emanage Blue - 450`s Hotwired Walbro - Gutted MAS - K&N Blitz SSBC - Aquamist Water Injection

10-25-2006, 05:10 PM	#49 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Saskatoon, SK Drives: '91 VR4 Trader Rating: (13)	Re: Lean Misfires at 2700-2800 rpm keithmac: What'd you have done with yours?

10-25-2006, 05:15 PM	#50 (permalink)
keithmac Forum Member Join Date: Sep 2006 Location: YORK / UK Trader Rating: (1)	Re: Lean Misfires at 2700-2800 rpm I just pulled the caps, gave the board a good cleaning with a fibre pencil and rubbing alcohol, checked all suspected tracks around the ecu and replaced the caps. I`m still running the stock mas though.. Caps cured all my crappy running problems.