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Aygo Misfire


gdadbling
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Hi all,

I hope someone on here can help, my Mum has a 2007 Aygo 1.0 petrol and it's developed a misfire! It starts and idles fine but when you start driving it starts misfiring after about 200 yards, turn the engine off and start again and its fine for another 200 yards until the misfire is back! It's always on cylinder 3, I've fitted new plugs, swapped coils and injectors but no difference. The injector seems to be being shut off by the ECU, have spoken to an ECU specialist who said there's no known faults with these ECUs. I've also done a compression check and all cylinders are at about 13 bar/200 psi.

I'm running out of ideas, any help on where to look next would be appreciated!

gdadbling

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Hmm, I very much doubt a misfire is not caught in the ECU error registry by some means or another and without that data. When you say it misfires at 200 yards, what are the other variables including rev level, speed and engine load...?

Perhaps a quick test run over 200,400,600 yards at 2000,3000,4000 RPM and so on to see if you can identify a fault matrix.

Do you have access to an ECU reader..?

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Thanks for your reply spazmoid, I have access to Bosch diagnostic equipment where I work but only read the fault code thus far. I'm having the car for more tests tomorrow so hopefully have some more info soon. I have heard the it could be a cluch fault, causing a vibration which the crankshaft sensor picks up and thinks it's a misfire.and then shutting off the injector. Have you heard of this before?

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  • 1 year later...

Still trying to get a grasp on the reason to my engine missfire. Talked to Gdadbling about it and his car just started running smooth again, I haven't been so lucky yet.

1.) Started with a broken ignition coil, got a new one, (only the broken one is replaced) that got the car running, but it started to missfire again when the engine got warm.

2.) Replaced sparkplugs on all three cylinders, got the car running smooth even when warm, but soon after, started to missfire again when the engnine has to work harder, e.g going upphill or accellerating on full throttle.

3.) Got myself an E- Diagnose on a local workshop and they told me the code I got means missfire problems on cylinder three, no **** Sherlock...

4.) Now what?

It is still an Aygo -07 petrol.

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What can cause the engine to misfire:

Fouled spark plug - one of the common reasons causing misfire

- problems with the ignition components: spark plugs, ignition wires, Ignition coil, Distributor, ignition module.

- fouled spark

- faulty fuel injectors

- lean air/fuel mixture due to bad airflow sensor, vacuum leaks, etc.

- vacuum leaks; examples: cracked vacuum hose, disconnected vacuum line, cracked intake snorkel

- low fuel pressure

- leaking cylinder head gasket

- low compression

- misadjusted valves

- worn valve train components

- improperly set timing

- Stuck open EGR valveEGR valve or purge valve (solenoid)

- clogged exhaust

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  • 7 years later...

I got same problem  on a 2011 it's on the same number 3 miss fire had injections  tested coil packs tested  and compression  test done all OK 

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when its misfiring inspect the plugs ...is one plug wet with fuel or random in appearance?

if you swap the coils around does the fault move with the coils?

could use a mechanics stethoscope to listen if all inj are ticking   , or a noid light to see if theyre getting a pulse from the ecu 

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  • 1 year later...

I know this is an old thread but was there any resolution to these faults?

Cheers

J

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You can't say solution to car 1 also applied to car 2, even they were the same make / model and year.

So, back to the basic, read the OBD2 code (if any).  Then inspect for:

  • Compression - Compression test each cylinder both dry and wet
  • Fuel - Electric wire / Injector current draw or inconsistent Injector internal resistance
  • Spark - check the spark plug's gap and any excessive oil residue.  Swap the coil around and see if the misfire move to another cylinder.

I will start with the easiest:

1. Check the spark plug

2. Swapping the coil and see if misfire changed to another cylinder

3. Compression test.

4. Check the injectors. (Recall from memory, someone had a broken wire on an injector once.)

Good luck.

 

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I agree with the post above. if you have tools, time, and knowledge keep trying; otherwise, it might be better to call someone to diagnose it. 

 

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Nice to see someone else is an SMA fan Vandals, best auto repair channel on YT for me, shame it's 99% American stuff but the diagnostic principles are still helpful and despite proclaiming not to be a diagnostics "expert", which to be fair, he isn't, he still knows his stuff.

 

Ps: OP, apologies this post doesn't help with your problem, hope you get it sorted.

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