Hi guys,

Car has 62000 miles (Panda 1.1 - 2006) and I am possibly having issues with injectors:

1. Throttle responds with a delay, mostly in 1st and 2nd gear
2. On cold start, sometimes it dies immediately, or idle is rough.
3. Car wants to die in 1st gear so I have to rev it in high rpm. Otherwise it shakes like crazy.
4. Engine is shaking, not very bad, but enough to notice it.
5. Hesitation on low throttle or when decelerating.
6. Clicking sound from the engine bay, not sure if it is tappets, valves or injectors.

Fuel pump has been changed 6000 miles ago. Maybe it is the culprit again?

Have you had any experience with fuel injectors? What actually fails on them? How it is fixed?

it would be unlikely for all 4 injectors to fail. I don't think we have seen one petrol one fail


if one failed it would show on the spark plug


are you sure its running on all 4 cylinders

they will run on 3 just not too well and the engine shakes a bit

koalar said:

it would be unlikely for all 4 injectors to fail. I don't think we have seen one petrol one fail


if one failed it would show on the spark plug


are you sure its running on all 4 cylinders

they will run on 3 just not too well and the engine shakes a bit

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How do I know if engine is working on 3 or 2 cylinders? Please explain the difference.

Engine do shakes a bit. When fuel pump failed, Fiat dealer told me it is a common problem with Panda because fuel filter is built into the fuel pump therefore it cannot be changed. When it clogs it kills the pump.

Maybe failure of the fuel pump means that injectors are clogged too?

I am surprised because as you said it is not common injectors to fail on petrol car, especially not on this engine. Maybe I am wrong?

if you listen to the exhaust at the back. There will be a slight pop pop sound

start the car

remove an injector plug one at a time. 3X will go worse

the one that doesn't make a difference is the cylinder that isn't firing correctly

Undo the 4 spark plugs..

Line them up in the poition they came out..
Cylinders 1 to 4

Compare their colours..
if they see different amounts of fuel.. you will see a different colour on the tip of the sparkplugs

Wasgehabendas said:

How do I know if engine is working on 3 or 2 cylinders? Please explain the difference.

Engine do shakes a bit. When fuel pump failed, Fiat dealer told me it is a common problem with Panda because fuel filter is built into the fuel pump therefore it cannot be changed. When it clogs it kills the pump.

Maybe failure of the fuel pump means that injectors are clogged too?

I am surprised because as you said it is not common injectors to fail on petrol car, especially not on this engine. Maybe I am wrong?

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It's more of a bit of mesh to stop large parts being suck in then a filter
And if that gets blocked you got far bigger problems with you tank or fuel supply

Have you plugged a code reader in?

I would say an ignition component failure is more likely. Perhaps a failing coil?

dac69er said:

Have you plugged a code reader in?

I would say an ignition component failure is more likely. Perhaps a failing coil?

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I did with MES - Registered version and nothing showed up. Yes, it could be the coil as problem became far worse when I changed the spark plugs.

Wasgehabendas said:

Yes, it could be the coil as problem became far worse when I changed the spark plugs.

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So why are you blaming the injectors..?


New plugs.. even more reason to remove and inspect them..

Once you know which cylinder is 'different' you can concentrate on the equipment making that 1 cylinder work

varesecrazy said:

So why are you blaming the injectors..?


New plugs.. even more reason to remove and inspect them..

Once you know which cylinder is 'different' you can concentrate on the equipment making that 1 cylinder work

Click to expand...

But if coil is the culprit it would throw some code isn't it? It's too strange there isn't any code

Show us your plugs..

varesecrazy said:

Show us your plugs..

Click to expand...

Okay sure once I make pictures gonna post it here.

Sounds to me like the dreaded 1.1 misfire.

The engine loom from the ECU seems to have common wire that has a joint in it that feeds the coils and injectors which is prone to breaking down.

It's a very common issue which only seems to affect the 1.1 for some reason.

See this, Superste seems to have identified and repaired his.
https://www.fiatforum.com/panda/420817-injector-problem-code-p0202-cyl-2-injector.html

You can us an IR thermometer at each exhaust port. On cold start they should all warm evenly. Cylinders running badly will be cooler. This does not work on a hot engine due to heat soaking through the whole manifold.

The 1.1 ECU wiring issue is likely. It can also throw up coil faults when the coils are actually ok.

varesecrazy said:

So why are you blaming the injectors..?


New plugs.. even more reason to remove and inspect them..

Once you know which cylinder is 'different' you can concentrate on the equipment making that 1 cylinder work

Click to expand...

I know where I would be looking

Wasgehabendas said:

But if coil is the culprit it would throw some code isn't it? It's too strange there isn't any code

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if the problem is on the low voltage side of coil the ECU may are may not detect a fault.

If its break down on the High voltage side from start up its unlikely to detect a fault if it never fires. It will may throw up a P0300 and/or P030? if its intermittently firing

Goudrons said:

Sounds to me like the dreaded 1.1 misfire.

The engine loom from the ECU seems to have common wire that has a joint in it that feeds the coils and injectors which is prone to breaking down.

It's a very common issue which only seems to affect the 1.1 for some reason.

See this, Superste seems to have identified and repaired his.
https://www.fiatforum.com/panda/420817-injector-problem-code-p0202-cyl-2-injector.html

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probably not a Good thread to link to any more


if you read the comments on the video they had to replace the ECU


we have had at lest 3 in the last few months. They have all been fixed by clamping the ECU connector down with cable ties

Once you wiggle the cables too much you are going to end up with an expensive repair.


However they all been cutting out under change of direction or over bumps which isn't what the OP is complaining of.

They gave some added information where it went worse after changing the spark plugs. It is possible they have damaged the wiring while doing this. But its unlikely and I wouldn't go wiggling the wires unnecessary

koalar said:

probably not a Good thread to link to any more


if you read the comments on the video they had to replace the ECU


we have had at lest 3 in the last few months. They have all been fixed by clamping the ECU connector down with cable ties

Once you wiggle the cables too much you are going to end up with an expensive repair.


However they all been cutting out under change of direction or over bumps which isn't what the OP is complaining of.

They gave some added information where it went worse after changing the spark plugs. It is possible they have damaged the wiring while doing this. But its unlikely and I wouldn't go wiggling the wires unnecessary

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When I changed the spark plugs at the same time mechanic changed the HT leads and cleaned the throttle body with carburetor cleaner. Is it possible something to be damaged around while doing these type of work?

Wasgehabendas said:

When I changed the spark plugs at the same time mechanic changed the HT leads and cleaned the throttle body with carburetor cleaner. Is it possible something to be damaged around while doing these type of work?

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OMG another thread where little bits of additional information comes out piece by piece like pulling teeth


Always change one thing at once and test otherwise you have no idea where any induced fault occurred.

why was the mechanic spraying the throttle in the first place


Unlikely to damage the ECU connector with HT, Throttle and spark plugs