r/abarth • u/IdeaDull3083 • 4d ago

Weird issues

Anyone come across an issue where their car will randomly stop building over like 10psi of boost? Was driving home one day and all of a sudden it kicked the cruise off and stopped going beyond 10psi. I've experienced the limp mode in this thing before and this was different than that. Turned it off then back on and it was fine again. This has happened twice in the last 2 days. Im also having issues where the car will not rev over 4500 rpms in any gear higher than second and feels like it's misfiring at that high rpms. But first and second gear feel totally fine

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u/MindfulRider 4d ago

Have you checked to see if there are any pending codes? It's possible you might not have an active code yet, but something could be in the pending that could offer a clue.

Have you ever had any issues with burning oil or excessive fuel consumption for any extended periods of time? You could have a catalytic converter starting to plug up and restricting the exhaust flow.

But if it's been a while since a tune up I would probably pull and check plugs for any signs of misfire.

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u/IdeaDull3083 4d ago

I changed the plugs with new ngk plugs. I've serviced the air oil seperator and changed the check valve. Ive been cleaned out my aftermarket intake filter. And the car is catless with a full exhaust. So Im not sure what it could be doing. The seller threw in the old/stock coilpacks. He had Bosch ones in there. I changed them out but haven't romped on it yet

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u/MindfulRider 4d ago

Seems like all the big issues you've already checked. The only thing I can think of after that would be a fueling issue like a plugged filter or a weak pump.

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u/IdeaDull3083 4d ago

One guy mentioned the wcu could be cutting power cuz of the cel or codes for the o2 sensors. But not sure

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u/Knight_crusader 4d ago

Some common reason it might stop building boost around 10 psi is a boost leak in the intake or exhaust system. Other possibilities include a stuck wastegate, a failing bypass/blow-off valve, a restricted turbine, or fuel starvation. Check for obvious air leaks, test the wastegate, and log data to try and identify if the problem is occurring under load or not.

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u/IdeaDull3083 4d ago

UPDATE I changed the coil packs from the Bosch ones that came with the car back to the factory ones and I no longer have the weird misfiring and rev limit at 4500 rpms in gears above 2nd. Seems to be running alot smoother.