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popeye775 Samba Member
Joined: January 05, 2021 Posts: 6 Location: NV
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Posted: Tue Jan 05, 2021 4:32 pm Post subject: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Wed Jan 06, 2021 7:07 am Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: December 05, 2015 Posts: 1285 Location: Right Here
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Posted: Wed Jan 06, 2021 7:20 am Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Advocatus Diaboli
Joined: August 31, 2013 Posts: 12857 Location: North Carolina
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Posted: Wed Jan 06, 2021 9:26 am Post subject: Re: Corrado Running Lean...Need Help |
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Sounds like too much shit has been done to “improve performance”. 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. _________________ Everybody born before 1975 has a story, good, bad, or indifferent, about a VW.
GOFUNDYOURSELF, quit asking everyone to do it for you!
An air cooled VW will make you a hoarder.
Do something, anything, to your project every day, and you will eventually complete it. |
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popeye775 Samba Member
Joined: January 05, 2021 Posts: 6 Location: NV
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Posted: Wed Jan 06, 2021 10:17 am Post subject: Re: Corrado Running Lean...Need Help |
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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. I’ve 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. I’ve 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 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Wed Jan 06, 2021 11:35 am Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: January 05, 2021 Posts: 6 Location: NV
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Posted: Wed Jan 06, 2021 11:47 am Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Wed Jan 06, 2021 12:01 pm Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: January 05, 2021 Posts: 6 Location: NV
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Posted: Wed Jan 06, 2021 1:54 pm Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Wed Jan 06, 2021 9:07 pm Post subject: Re: Corrado Running Lean...Need Help |
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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 Samba Member
Joined: January 05, 2021 Posts: 6 Location: NV
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Posted: Wed Jan 13, 2021 5:45 pm Post subject: Re: Corrado Running Lean...Need Help |
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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 I’m 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 haven’t pulled plugs at WOT in a bit so I’m unsure if it’s 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 Samba Member
Joined: April 24, 2014 Posts: 2471 Location: Meridian,ID
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Posted: Thu Jan 14, 2021 7:07 pm Post subject: Re: Corrado Running Lean...Need Help |
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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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popeye775 Samba Member
Joined: January 05, 2021 Posts: 6 Location: NV
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Posted: Wed Jan 20, 2021 2:42 pm Post subject: Re: Corrado Running Lean...Need Help |
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ps2375 wrote: |
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. |
Hi sir, ended up getting some OEM vacuum hose. I am going to replace the cheap vacuum hose that I have on the FPR today, and have already replaced the vacuum for the ECU. If the car continues to run lean even after these are changed, I am going to assume that it is exhaust gaskets allowing extra air to get by to my AFR and check those next. I feel like I have checked everything else and everything else seems to have checked out. |
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