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Corrado Running Lean...Need Help
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popeye775
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PostPosted: Tue Jan 05, 2021 4:32 pm    Post subject: Corrado Running Lean...Need Help Reply with quote

Hi all,

I am new to this forum. I am apart of Vortex and The-Corrado forum as well. I am trying to get as many opinions as I possibly can. Here is my issue: My 1990 Corrado G60 is running lean. I have a wideband installed and am getting 16-18 AFR while idling after warming up a couple minutes, 14.5-15.5 AFR while cruising, and the lowest it will go at wide open throttle is 13.5 AFR. When I come to a stop, the AFR will be at 14.8 for a couple seconds and slowly creep back up to that 16 range. Here are the things that I have done recently:

- Spark plugs

- Injectors (stock size)

- 268/270 Cam

- BBM stage 3 chip

- 3.5 bar pressure regulator (currently set to 3 bar because fuel pressure gauge freaked out at around 3.5 bar)

- All new vacuum lines (the ECU vacuum hose is exactly 1m and OEM spec long as per the bentley/the FPR vacuum is not the braided factory spec though)

- Smoke tested

- Fuel pump replaced 5k miles ago (along with the fuel filter)

- Fuel lines replaced

- Timing checked

- Spark plug wires replaced

- CO Pot set to 250 ohm

- Fuel injector wiring replaced

- Intake Manifold Gasket replaced

- New ground wires

- New relays and new CTS as well

The other thing that I have done is done a leak down test. To which I did find bad piston rings (or worn piston rings in two cylinders) but was not sure if this could be the cause of the lean running conditions or not. Valves are good, and head gasket is also good. The other things that I also have are new 30lb injectors that I can put into the car whenever needed. I do have plans for the piston rings already, but again I am not sure if this can be the issue to the lean issue or not. Any recommendations or tips would be greatly appreciated. I am not sure how many people are on here anymore, but if there is anyone still on here, any recommendations on things to look at?
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ps2375
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PostPosted: Wed Jan 06, 2021 7:07 am    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

Is the WB installed in addition to the ECU's sensor? If so, are both sensors in the same general location on the exhaust?
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Butcher
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PostPosted: Wed Jan 06, 2021 7:20 am    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

How does the engine run?

How do you know your wideband controller is even working properly? Small exhaust leaks can cause issues.
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TDCTDI
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PostPosted: Wed Jan 06, 2021 9:26 am    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

Sounds like too much shit has been done to ďimprove performanceĒ. In my experience, only but so many modifications can be made before they stop playing well together. First & foremost, are you running a stand alone engine management or just a rechip/tune on a stock ECM? The stock ECMs are designed to run lean & oddly have a way of running home to momma to override any sort of performance tune overwritten onto them. This also tends to cause the ECMs to just take a shit & quit altogether.


Definitely do a smoke test on the exhaust side as well.
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popeye775
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PostPosted: Wed Jan 06, 2021 10:17 am    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

Hey guys,

So the wideband is installed next to the ECU sensor. I got a bung welded on right where the wideband requires. The reason i say it runs lean as well is by looking at spark plugs throughout this process. Iíve been pulling plugs and looking at them to make sure that it actually is running lean. I can post a photo of the spark plugs as well. As for ECU, i am running stock ECU. Iíve been working with BBM when it comes to tuning my Corrado. I attached both photos of the spark plugs.

Thank you all in advance for the replies as well!

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ps2375
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PostPosted: Wed Jan 06, 2021 11:35 am    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

Is that plug pulled after some idle time or was the motor shut down during a WOT run and pulled? IT makes a diff when trying to read the plug.
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popeye775
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PostPosted: Wed Jan 06, 2021 11:47 am    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

ps2375 wrote:
Is that plug pulled after some idle time or was the motor shut down during a WOT run and pulled? IT makes a diff when trying to read the plug.


From what I remember, this was right after driving. I don't think I let the car sit really at all after driving it. I got back from just driving around a bit, shut it off, and pulled a plug. I do not believe I did any WOT pulls during that drive either.
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ps2375
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PostPosted: Wed Jan 06, 2021 12:01 pm    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

When you "read" a plug, you shut the motor off at the point you want to read it for. Anything else is hit or miss for reading the plug.
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popeye775
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PostPosted: Wed Jan 06, 2021 1:54 pm    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

ps2375 wrote:
When you "read" a plug, you shut the motor off at the point you want to read it for. Anything else is hit or miss for reading the plug.


Ah gotcha! I will the next time i pull plugs. I will do it after a WOT pull
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ps2375
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PostPosted: Wed Jan 06, 2021 9:07 pm    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

popeye775 wrote:
Ah gotcha! I will the next time i pull plugs. I will do it during a WOT pull


fixed.
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popeye775
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PostPosted: Wed Jan 13, 2021 5:45 pm    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

Hey guys,

For anybody still following this thread, i made some headway. I replaced the ECU vacuum with OEM vacuum hose. It helped a bunch actually. Cruising around 2k RPM the car runs at ~14.8 AFR. When Iím driving and come to a stop, it will stay at about 14.5-14.8 AFR for a second but then slowly creep up to ~16-17.5 AFR. WOT is around 13.5-14 so still a little lean. I havenít pulled plugs at WOT in a bit so Iím unsure if itís just an exhaust leak causing my wideband to freak out or not but any opinions from anybody still following this thread?
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ps2375
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PostPosted: Thu Jan 14, 2021 7:07 pm    Post subject: Re: Corrado Running Lean...Need Help Reply with quote

Get some quality vacuum line at Silicon intakes .com. They have a thick wall hose that won't collapse and will last longer than the car. Sounds like you might be making head way.
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