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Fiat Seicento 2000 1.1 Gasoline - Engine Chokes on Acceleration, Injection Light On

miki1203 14505 16
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Why does my Fiat Seicento 1.1 gasoline choke and stall when I press the accelerator, with the injection light on?

Read the ECU fault codes first, because the injection light means the controller has stored a sensor error [#16827312][#16828153][#16828170] Also check the vacuum line from the intake manifold to the brake servo for cracks, kinks, or blockage; a vacuum leak there can make the engine choke and die under throttle, and one reply suggested disconnecting the servo hose to see if the symptom changes [#16827512][#16827895][#16828551] Inspect the MAP sensor wiring/cable too [#16828551] A bent fuel return hose was also mentioned as a possible cause [#16827100] If you cannot read the codes yourself, have them read and decoded in a workshop [#16828170]
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  • #1 16827048
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    Hello, my problem is this. When adding gas, the car begins to choke and goes out. The injection light is switched on immediately. As if he lacked fuel. There is no problem with reversing.
    Fiat Seicento year 2000 1.1 gasoline
    I have already mentioned:
    - candles + cables
    - I cleaned the fuel pump
    - I have cleaned all the plugs
    - I cleaned the carburetor, also injection
    - the computer in these models is without collision.
    I do not have strength anymore. Please help.
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  • #2 16827100
    deezoo68
    Level 13  
    Posts: 37
    Help: 5
    Rate: 16
    Quite recently I had similarly with another car. The reason was the bent fuel return hose, but what did I get into?
  • #3 16827312
    sandamiano
    Level 31  
    Posts: 1191
    Help: 161
    Rate: 353
    miki1203 wrote:
    Hello, my problem is this. When adding gas, the car begins to choke and goes out. The injection light is switched on immediately.

    And here is an indication not to walk in the dark but to read errors. The controller itself informs the control that something is wrong with one of the sensors. Maybe it is not a miracle of technology but the diagnostic memory holds and holds even after disconnecting the power supply
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  • #4 16827512
    andrzej20001
    Level 43  
    Posts: 17763
    Help: 1574
    Rate: 6645
    As on the reverse is the spear, the hose from the servo is cracked and sucks the air, the motor moves on the pillows in the opposite direction on the reverse. And the question of the fuel pump in the tank, but then how would you pay the flood? half it would rather walk normally ...
  • #5 16827692
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    The hose from the servo (servo is a brake, pump) what are the brakes to suffocate the car and cut off the fuel?
  • #6 16827863
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38692
    Help: 3162
    Rate: 6463
    The brake servo is "powered" by vacuum from the engine.
  • #7 16827876
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    Do you think the servo is cracked?
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  • #8 16827895
    tzok
    VIP Meritorious for electroda.pl  
    Posts: 38692
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    Not after all andrzej20001 he clearly defined his theory - a cracked / obstructed vacuum line connecting the collector with the servo. Driving on the reverse deflects the drive unit in the opposite direction than driving forward.

    It may just as well be a torn-up engine mass switch.
  • #9 16828132
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    Gentlemen, the hose from the servo is good, one end comes into such a plastic and the other end into such a tube. I am concerned that this tube holding the hose on the other side is tilted towards the windshield. Could this be the reason?
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  • #10 16828153
    web69
    Level 33  
    Posts: 2147
    Help: 188
    Rate: 627
    Or maybe you will finally read errors from the ECU? If the "carrot" lights up, it will be known immediately what the kaman ...
  • #11 16828159
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    Well, if I could read it.
  • #12 16828170
    wojtek1234321
    Level 36  
    Posts: 3553
    Help: 306
    Rate: 1127
    miki1203 wrote:
    Well, if I could read it

    Well, all you have to do is insert read logs into the thread and find out what they are decoding (error numbers).
  • #13 16828352
    andrzej20001
    Level 43  
    Posts: 17763
    Help: 1574
    Rate: 6645
    As the car on the reverse fuel, this reason is prosaic.
  • #14 16828386
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    And I say that the bank will have a crankshaft sensor.
  • #15 16828551
    mario 77
    Level 23  
    Posts: 510
    Help: 66
    Rate: 335
    miki1203 wrote:
    And I say that the bank will have a crankshaft sensor

    If you are sure "on the bank" then why did not you change the sensor, ask for help in the forum?
    And when driving on the reverse, everything is OK with the sensor?
    If you do not have what to check for errors then do not be blind to get the servo out of the collector and you will know more. You can also check the MAP sensor cable.
  • #16 16853742
    miki1203
    Level 7  
    Posts: 13
    Rate: 7
    Hello, I was hooked. It's a computer. Failed to
  • #17 17677627
    Duda111
    Level 8  
    Posts: 28
    Rate: 16
    Hello, I also have a problem with Seicent 900 with gas. Yesterday I drove normally, there was a piece of dry surface and suddenly caught the snow and turned on, something hit and suddenly lost power, after a while I turned on as it turned on, the gas turned on, the car went out, switched on BP walked for a while, normally started after a few seconds went out again, he rested a little and around Maciej, please help me.
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Topic summary

✨ The discussion revolves around a 2000 Fiat Seicento 1.1 gasoline vehicle experiencing engine choking during acceleration, accompanied by the illumination of the injection light. The owner has already performed several maintenance tasks, including cleaning the fuel pump, carburetor, and spark plugs, but the issue persists. Various suggestions are made, including checking for a bent fuel return hose, reading error codes from the ECU, and inspecting the brake servo for vacuum leaks. The possibility of a faulty crankshaft sensor and issues with the MAP sensor cable are also mentioned. The owner expresses frustration over the inability to read error codes, which could provide more insight into the problem.
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FAQ

TL;DR: In this thread, 1/1 confirmed fixes = "It's a computer" (failed ECU) after choking on throttle and MIL on. [Elektroda, miki1203, post #16853742]

Why it matters: This FAQ shows how to quickly triage Seicento 1.1/0.9 stalling with the injection light, even without a scan tool; it’s for DIY owners and techs who want fast, forum-proven checks.

Quick Facts

What does it mean if my Seicento chokes on acceleration and the injection light turns on?

That pattern points to the engine going lean or losing critical sensor input during throttle. The MIL turning on means the ECU detected a fault and stored a code. Reversing normally can mask movement-related issues. Start with fault-code reading to avoid guesswork. Document when the light appears and whether throttle or load triggers it. Then check for vacuum leaks and wiring strain. If codes are unreadable, follow the quick mechanical checks below before swapping parts. [Elektroda, miki1203, post #16827048]

Why would it run in reverse but stall going forward?

When you select reverse, the powertrain shifts in the opposite direction. That motion can tug vacuum hoses or stressed grounds, temporarily restoring or worsening a connection. As one expert noted, it can even expose a torn engine ground strap. Inspect the brake servo vacuum line, MAP hose, and engine ground while rocking the engine. Movement-sensitive faults explain direction-dependent symptoms during acceleration. "It may just as well be a torn-up engine mass switch." [Elektroda, tzok, post #16827895]

Can the brake servo vacuum hose really cause stalling?

Yes. A cracked or loose servo vacuum hose becomes an unmetered air leak. That leans the mixture during throttle, causing hesitation or a stall. Because braking and engine load vary together in traffic, you may see intermittent symptoms. Flex the hose while idling and listen for pitch changes. Check the one-way valve orientation. Replace any hardened or split sections. Confirm by temporarily isolating the line per the How‑To below. [Elektroda, andrzej20001, post #16827512]

What’s the first diagnostic step when the injection light comes on?

Read the ECU fault memory. The controller turns the light on to point you to a specific sensor or system. It retains errors even after power loss, so you won’t erase clues by disconnecting the battery. "The controller itself informs the control that something is wrong with one of the sensors." Capture codes at the moment of failure if possible. Then test the implicated circuit rather than replacing parts blindly. [Elektroda, sandamiano, post #16827312]

I don’t have a scanner—what quick checks can I do today?

Perform targeted mechanical checks: inspect and reseat the brake servo hose at the intake. Temporarily disconnect the servo from the manifold and plug the port to rule out a vacuum leak. Wiggle-test the MAP sensor lead while idling. If symptoms change, repair the wiring or hose. These checks cost nothing and can confirm a vacuum or harness issue before you book diagnostics. [Elektroda, mario 77, post #16828551]

Could a crankshaft position sensor cause these symptoms?

Yes, a failing crank sensor can cause sudden cutouts or no-starts, especially when hot. However, your thread’s direction-dependent behavior suggests movement or vacuum issues first. Test sensor signal with a scope or substitution only after code reading. Avoid replacing on speculation. One user suspected this sensor here but the confirmed fix differed. Prioritize faults flagged by the ECU. [Elektroda, miki1203, post #16828386]

What is the MAP sensor, and why does its cable matter?

The MAP (Manifold Absolute Pressure) sensor measures intake vacuum for fuel and ignition calculations. A loose hose or damaged cable feeds wrong load data, causing lean spikes and stalls on throttle. Inspect the small vacuum hose and the sensor’s electrical connector. Clean and reseat both ends. Repair any cracked rubber or chafed wires before further testing. A quick wiggle test can expose intermittent faults. [Elektroda, mario 77, post #16828551]

What ultimately fixed the original poster’s Seicento?

The OP reported an ECU failure and resolved the issue after addressing the computer. That is the only confirmed outcome in this discussion. Keep ECU power and ground integrity in mind during diagnostics, since weak supply can mimic module failure. Verify basics before condemning the unit. If codes and tests implicate the ECU, seek repair or replacement. [Elektroda, miki1203, post #16853742]

How do I quickly check for a brake servo vacuum leak?

Try this three-step check:
  1. Warm the engine; set the parking brake.
  2. Disconnect the servo hose at the intake and plug the manifold port securely.
  3. Blip the throttle; if hesitation disappears, repair the hose/check valve/servo. Perform a road test carefully once reconnected. Replace brittle hoses and verify one‑way valve function. This isolates a major unmetered air source in minutes. [Elektroda, mario 77, post #16828551]

Can a kinked fuel return hose cause hesitation or stalling?

Yes. A bent or pinched return can alter rail pressure and upset fueling during throttle transitions. One forum user reported a similar case traced to a bent return hose. Inspect the full run of supply and return lines for kinks near clips and the tank. Straighten or replace any restricted sections and retest. This is a low-cost, high-impact fix when present. [Elektroda, deezoo68, post #16827100]

Could a bad engine ground strap cause cutouts on acceleration?

Yes. A torn or corroded engine ground can intermittently drop ECU and sensor reference grounds under torque. That causes misfires, stalls, or random warning lights. Inspect the ground strap between engine and body. Clean both lugs and reinstall tightly. Flex the harness while idling to reveal movement-related dropouts. Replace any frayed strap you find. [Elektroda, tzok, post #16827895]

What is the brake servo and how is it connected to the engine?

The brake servo (booster) multiplies pedal force using engine vacuum. A hose connects the intake manifold to the servo through a one‑way valve. Any crack or disconnection becomes a vacuum leak, leaning the mixture and destabilizing idle. That can trigger hesitation when you add throttle. Ensure the hose seats firmly and the valve faces the correct direction. [Elektroda, tzok, post #16827863]

Two users told me to read codes—do I really need to?

Yes. Forum guidance emphasized code reading because it targets the failing circuit. Skipping this step leads to parts darts. As one member put it, just read the logs and decode the errors. Capture codes during the fault event for the best clues. Then test that system methodically. "It will be known immediately what the kaman ..." [Elektroda, web69, post #16828153]

Is an ECU failure common, and how do I confirm it?

In this thread, one user confirmed a failed ECU; others proposed hoses, grounds, and sensors first. Confirm ECU faults only after verifying clean power, grounds, and signal wiring. If codes persist with correct inputs and outputs, the ECU may be defective. Professional testing or substitution is the proof step. Avoid premature replacement. [Elektroda, miki1203, post #16853742]

Edge case: the tube angle toward the windshield—could that matter?

A misrouted or tilted hose/tube can kink under engine movement, creating a sporadic vacuum leak. If reversing changes the tilt, symptoms may appear directionally. Reseat the tube, ensure smooth bends, and secure with proper clips. Re‑evaluate acceleration response after correcting routing. This matches the thread’s movement-sensitive theme and is quick to rule out. [Elektroda, tzok, post #16827895]
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