Intermittent issue of car not accelerating

GUNNZ_N_ROZEZ

MEMBER
2016 FIAT PUNTO
1.3L
4 CYL
TURBO
2WD
MANUAL
60,000 MILES

Hi, I have a manual transmission diesel car (Fiat urban cross) and I am having intermittent issues of car not accelerating even when the pedal is fully pressed. The problem occurs once in a while especially when car is driven for longer in traffic. No warning lights show up and I had a scan done and it didn't generate any past codes. A local mechanic mentioned that if its anything to do with fuel/air/sensors, warning light should come up and advised to drive until the problem becomes regular but I don't want to wait and perhaps damage other parts as well. So wanted to know what you think is causing the issue?

1 Reply

BORIS K

MECHANIC
756 POSTS

Hello,

Could you please clarify if this "No acceleration " problem relates to no acceleration at all or if the vehicle will accelerate but only very slowly?
If the vehicle will accelerate slowly and the issue is accompanied by a low idle speed then I would suggest to have your mechanic look at a possible sticky EGR valve or a sticky air control flap. These components are known to coke up and possible require cleaning.

Please see description of how a throttle actuator works (petrol vehicle) but similar in operation on your diesel engine.

https://www.2carpros.com/articles/how-a-throttle-body-works

and how to clean.

https://www.2carpros.com/articles/throttle-actuator-service

Please see images below for EGR valve (Exhaust Gas Recirculation valve) and air control flap (throttle body).

Please let us know how you get along.

Cheers, Boris

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