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Thread: New Fiat owner running into diverter valve issues

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    New Fiat owner running into diverter valve issues

    Hi everyone! Fiat beginner here, wanting to learn and grateful to have found this forum!
    I bought an 2012 500 Abarth a few weeks back an absolutely adore it. The only downside is the number of check engine lights that have cropped up in the short time I've own it. The most recent has been a turbo boost leak that a local shop has tracked down to being the diverter valve. The problem is that the valve is an aftermarket part and not a OEM part. The mechanic says the shop is not able to do anything with aftermarket parts or tuning, and he's not even sure if the car has been flashed, and therefore he doesn't feel comfortable of doing anything about it. Now by all means, I'm a beginner in understanding how cars work, but how hard would be to replace the diverter valve myself? After some research, I've found good things concerning the GFB diverter, and it doesn't seem to be a complicated job to remove the intake pipe, a few bolts, at put the new one on. Am I missing something or is there any other advice you'd have before just doing it myself? I've done small jobs (like brakes) around cars before but this would be my first time poking around the engine and turbo.
    Thanks for any advice!

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    lammie200's Avatar
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    I think the GFB diverter valve upgrade is pretty easy to do. I will know more after I install the one that I ordered a few days ago. Hopefully it will arrive before the weekend. I fear that your problem may be the solenoid that the valve mounts to, however. I doubt that the stock valve may have gone bad but it might have I suppose.
    2017 Abarth Grigio Cenere SR | OEM 17s | EC V3 & Sprint Panel Filter | E+D Tune P1 | TMC Autoflash | 4C CPs | MPx Exhaust | RRM Turbo Blanket | GFB DV | PCV Catch Can | 5mm/12mm Spacers | Neu-F Rear Bar | DNA Lower & Side Braces | 4 Konis | 4 Springs | MPx MC Bracket | 2" Steering Wheel Spacer

    2013 Sport Argento SR - SOLD - | Many Mods

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    Thank you for the reply! So you're saying that it might be that replacing the diverter valve won't fix the issue? The one currently on the turbo is not stock, but actually an aftermarket part, I haven't gotten my car back from the shop so I'm not sure exactly what it is, the mechanic said its a magenta colored bolt on, which makes me think its actually the GFB diverter itself, which is a magenta color. He just did a smoke test and told me it was that part that was leaking. But the fact that it may be a GFB valve on there now makes me skeptical of whether replacing it will do any good. I'm unfamiliar with the layout, is there any way to replace the solenoid you mentioned?
    Thanks again, I appreciate the feedback.
    Last edited by jdog; 02-25-2021 at 03:20 PM.

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    When you get it back remove it and check the seal. Get a new seal before hand if you’d like. It may be it was only poorly installed, leading to an unseated or pinched seal, or not snugged up evenly. One forward bolt is harder to access.

    a short section of the appropriAte sized hex shank in a 1/4 socket on a universal joint, and I think I may have even used a flexible cable extension for the lower forward fastener. A ball end allan key should also help in that position.

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    Quote Originally Posted by jdog View Post
    Thank you for the reply! So you're saying that it might be that replacing the diverter valve won't fix the issue? The one currently on the turbo is not stock, but actually an aftermarket part, I haven't gotten my car back from the shop so I'm not sure exactly what it is, the mechanic said its a magenta colored bolt on, which makes me think its actually the GFB diverter itself, which is a magenta color. He just did a smoke test and told me it was that part that was leaking. But the fact that it may be a GFB valve on there now makes me skeptical of whether replacing it will do any good. I'm unfamiliar with the layout, is there any way to replace the solenoid you mentioned?
    Thanks again, I appreciate the feedback.
    You could have an aftermarket spacer that vents to the atmosphere. That may throw a code. TBH, I don't know much about it, but I don't think using the GFB diverter with the OEM solenoid should cause problems. The GFB just replaces the stock valve with more robust parts. You can put in an additional spacer that diverts to the atmosphere though. I wasn't planning on doing that on mine. And yes, you can replace the solenoid. It is the thing that the diverter valve bolts onto. Should be pretty easy to do if you need to replace it. I think that they cost about $130.
    2017 Abarth Grigio Cenere SR | OEM 17s | EC V3 & Sprint Panel Filter | E+D Tune P1 | TMC Autoflash | 4C CPs | MPx Exhaust | RRM Turbo Blanket | GFB DV | PCV Catch Can | 5mm/12mm Spacers | Neu-F Rear Bar | DNA Lower & Side Braces | 4 Konis | 4 Springs | MPx MC Bracket | 2" Steering Wheel Spacer

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    jdog (02-26-2021)

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    Thanks for the replies. Based off of what the mechanic said, I'm thinking the car does have the GFB diverter and blow off adapter plate, making that "psshh" sound. I always thought that the sound was how the abarth came stock, but based on what you've said and what else I've read, it sounds like that's the effect of having that blow off plate. I'm picking up my car tomorrow and plan on inspecting the diverter valve and plate and see if I can notice any wear or grime that could be causing the leak. Thanks for all the help. I feel a bit more confident and definitely more knowledgeable about how turbos work. I'll keep y'all posted if I run into any more issues, or if I'm able to successfully fix it for that matter

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    Cool. Keep us posted. My GFB DV might arrive before the weekend. I will let you know how it works out.
    2017 Abarth Grigio Cenere SR | OEM 17s | EC V3 & Sprint Panel Filter | E+D Tune P1 | TMC Autoflash | 4C CPs | MPx Exhaust | RRM Turbo Blanket | GFB DV | PCV Catch Can | 5mm/12mm Spacers | Neu-F Rear Bar | DNA Lower & Side Braces | 4 Konis | 4 Springs | MPx MC Bracket | 2" Steering Wheel Spacer

    2013 Sport Argento SR - SOLD - | Many Mods

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    Not my Video:



    These GFB Valves are prone to stick and get gummed up. I highly recommend you remove it and run the OEM Turbo Diverter Valve.
    Last edited by Fiat500USA; 02-26-2021 at 02:36 PM. Reason: embedded video
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    I just ordered the GFB. My guess is to keep it oiled so it doesn't stick. That fact that it holds boost nicely up top is a huge gain. I wonder if the turbo can hold till redline or does it fall off?
    2013 Fiat 500 Abarth.
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    Quote Originally Posted by EvilEvoIX View Post
    I just ordered the GFB. My guess is to keep it oiled so it doesn't stick. That fact that it holds boost nicely up top is a huge gain. I wonder if the turbo can hold till redline or does it fall off?
    You guys really need to run research prior to ordering parts.

    If you want to increase boost pressure in the higher RPM you need to replace the wastegate.
    The Boost Diverter is controlled by the PCM.
    2020 DODGE Challenger R/T Scat Pack Widebody
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    "I thought you had a HEMI. Yeah, I had to have a footprint gas pedal installed. So I stole this pile."

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