Technical Help! Panda running on 3 cylinders!

[MikeBall]

Hi, would appreciate any help or ideas. Our little 2008 1.2 dynamic is only running on 3 cylinders. I've done plugs, ht leads, coil packs, compression test, checked drainage channels below windscreen for water, checked ECU plug for dirt and visually checked as much wiring as possible still no joy. Any ideas would be appreciated

 

[varesecrazy]

Hi, would appreciate any help or ideas. Our little 2008 1.2 dynamic is only running on 3 cylinders. I've done plugs, ht leads, coil packs, compression test, checked drainage channels below windscreen for water, checked ECU plug for dirt and visually checked as much wiring as possible still no joy. Any ideas would be appreciated

Hi

Soak the exhaust manifold.. So it goes Dark,

Run the engine see which branch lightens last

Then swap coils around.. See what moves

A poor connection is a fair possibility..

 

[koalar]

Pull a HT lead off one at a time

Which one makes no difference is the one that's not firing

Are you sure it's a one cylinder misfire

What was the compress result

Post at a video of the exhaust sound might be helpful

Sorry it's a long list we need to start to narrow it down

Please don't change any more parts in the hope of fixing it

Slightly different coil pack on mine, yours will be two on the right of the engne

 

[MikeBall]

Hi

Soak the exhaust manifold.. So it goes Dark,

Run the engine see which branch lightens last

Then swap coils around.. See what moves

A poor connection is a fair possibility..

Hi, have swapped coils around, and ht leads, not running on number one cylinder, compression about 160psi but definitely spark at spark plug.

 

[MikeBall]

Pull a HT lead off one at a time

Which one makes no difference is the one that's not firing

Are you sure it's a one cylinder misfire

What was the compress result

Post at a video of the exhaust sound might be helpful

Sorry it's a long list we need to start to narrow it down

Please don't change any more parts in the hope of fixing it

Slightly different coil pack on mine, yours will be two on the right of the engne

View attachment 438129

Definitely not firing on number one cylinder, compression 160psi. and there's a good spark at spark plug. Swapped all the leads and plugs around made no difference. I've insulated the ht leads now with high quality insulation tape just incase they are tracking.

 

[koalar]

So what happens if you run the car with number HT lead unplugged and plugged

Is there a difference in engine idle

160psi should fire but it's well down

Are the other cylinders the same

 

[MikeBall]

So what happens if you run the car with number HT lead unplugged and plugged

Is there a difference in engine idle

160psi should fire but it's well down

Are the other cylinders the same

Makes no difference with ht leads in or out. Compression tested by holding tester bar in because it wouldn't screw in, I was under the impression 160 was about right

 

[koalar]

Makes no difference with ht leads in or out. Compression tested by holding tester bar in because it wouldn't screw in, I was under the impression 160 was about right

210 plus on the euro 5 engine which is a slightly higher compression ratio

Below 145 alarm bells would be ringing

160 is okay ish, crank speed, temperature, oil grade, if the car been stood, just run, throttle open or closed, gauge accuracy and so


I use the cone it's quicker you do have to push down hard though

I call it good as 145 is good enough to fire and you are past that

 

[koalar]

Do you have a bidirectional scantool where you can command the injector to open

If so command cylinder one to open and close

You should hear it click

It will not tell you if its working but will tel you ecu and wiring is fine

 

[koalar]

If you put a screwdriver against the injector near where the electrical connector goes in I find best

You should hear it clicking, compare it to the others

 

[MikeBall]

Do you have a bidirectional scantool where you can command the injector to open

If so command cylinder one to open and close

You should hear it click

It will not tell you if its working but will tel you ecu and wiring is fine

I don't, read something about a sensor in the inlet manifold, are there any sensors that would cause this fault

 

[MikeBall]

If you put a screwdriver against the injector near where the electrical connector goes in I find best

You should hear it clicking, compare it to the others

Will try that tomorrow thanks, raining hard now and need a break from it ..driving me mad!

 

[koalar]

I don't, read something about a sensor in the inlet manifold, are there any sensors that would cause this fault

Lots of sensors cause a random misfire

No sensor causes one cylinder not to fire

Compression, spark at the right time, the right amount of fuil and air

Because it sparks in the open does not mean it will spark under compression, You have swapped the plugs over to see if the fault follows the plug

Any history to how it failed

Gradual
After swapping a part
Overheating

Does it fail only at lower revs, how does it drive

 

[MikeBall]

Lots of sensors cause a random misfire

No sensor causes one cylinder not to fire

Compression, spark at the right time, the right amount of fuil and air

Because it sparks in the open does not mean it will spark under compression, You have swapped the plugs over to see if the fault follows the plug

Any history to how it failed

Gradual
After swapping a part
Overheating

Does it fail only at lower revs, how does it drive

Yes, have swapped plugs and leads round so many times! It played up a few times then cleared, now only on 3 all the time. Drives ok, quite smooth really!!

 

[koalar]

Mmmmm

Shouldn't

They idle quite well on 3 cylinders and shake a bit on 2 clinders

But it should be quite noticeable on any gradients

 

[varesecrazy]

Hi, have swapped coils around, and ht leads, not running on number one cylinder, compression about 160psi but definitely spark at spark plug.

The Big concern is lack of servicing can overstress the Spark Driver Board

So the one coil is getting no signal to produce the High Tension


Swapping coils around should prove / disprove that..

Moving the dead cylinder with a different supply

What state were the original spark plugs?

 

[MikeBall]

The Big concern is lack of servicing can overstress the Spark Driver Board

So the one coil is getting no signal to produce the High Tension


Swapping coils around should prove / disprove that..

Moving the dead cylinder with a different supply

What state were the original spark plugs?

Yeah, have swapped coils packs around, no difference. Spark plugs all look good.

 

[MikeBall]

The Big concern is lack of servicing can overstress the Spark Driver Board

So the one coil is getting no signal to produce the High Tension


Swapping coils around should prove / disprove that..

Moving the dead cylinder with a different supply

What state were the original spark plugs?

I have swapped the coil packs around, no difference. Spark plugs looked good

 

[The Panda Nut]

You could also buy one new plug. Try it in each cylinder and see if it does the trick.

 

[MrMagoo]

Plugs 1&4 and 2&3 batch fire, and you have checked firing is correct.
Compression test is the same for all cylinders.
Injection is sequential and you need to check if injector 1 is operating as it is not misfiring.