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Technical Juddering

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Technical Juddering

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Jaybo

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Hello there,

I have noticed when driving down the motorway for 30 minutes at around 70 mph I get the engine warning light flashing a few times then it goes off after about 10 seconds.

I have an OBDII dongle which I used to see if any errors have been logged. I found that cylinder 2 & 3 we're misfiring. Therefore I replaced the spark plugs and made sure that all cables were correctly in place. However the problem still existed so I replaced the coil pack, which still showed the errors so I swapped the leads round (1 with 2 hoping that if it was the leads then it would misfire under 1)

I'm stuck to what to check next, ECU?
 
A few questions:
1. What engine
2. Are you getting random codes or the same ones?
3. You haven't recently had the timing belt changed have you?
 
It's a 1.2 and yes I have had my mining belt changed forget to mention that I have read something about phonic wheel.

Yes the codes are the same I haven't got them on me at this time but will add them later.
 
Here are the codes I am getting,

random misfire P0300
Cylinder Misfire 2 P3002
Cylinder Misfire 2 P3003
 
Last edited:
Sounds similar to my daughter's 1.2 which was throwing different codes each time they were cleared after having the belt changed (at around 70k miles). The Phoenic wheel learn that I was given (which is posted in several places on the forums here) is to do the following:
i. With a warm engine.
ii. Rev up to 5,000rpm hold for 3 seconds.
iii. Let it drop down to idle.
iv. Rev to 5,000rpm hold for 3 seconds.
v. Drop to idle.
vi. Rev to 5,000rpm hold for 3 seconds.
vii. Drop to idle.
viii. Switch right off and wait a few moments.
Then you're done. Though I must say I'm sure how strictly the 3 seconds is needed each time.

Anyway cured the problem on ours and has been fine for several thousand miles now.

As a second check make sure you don't have any leaks on the inlet side from either the large or small hoses that are under the airbox. Those caused us misfire problems too on a different occasion.
 
DGPunto said:
As a second check make sure you don't have any leaks on the inlet side from either the large or small hoses that are under the airbox. Those caused us misfire problems too on a different occasion.
Click to expand...

but air being drawn in there SHOULD effect ALL cylinders fairly equally..??,


the OP is getting 2 cylinders repeatedly,
pointing to an electrical / control issue ,
phonic relearn sounds promising, : - }


Charlie
 
DGPunto said:
Sounds similar to my daughter's 1.2 which was throwing different codes each time they were cleared after having the belt changed (at around 70k miles). The Phoenic wheel learn that I was given (which is posted in several places on the forums here) is to do the following:
i. With a warm engine.
ii. Rev up to 5,000rpm hold for 3 seconds.
iii. Let it drop down to idle.
iv. Rev to 5,000rpm hold for 3 seconds.
v. Drop to idle.
vi. Rev to 5,000rpm hold for 3 seconds.
vii. Drop to idle.
viii. Switch right off and wait a few moments.
Then you're done. Though I must say I'm sure how strictly the 3 seconds is needed each time.

Anyway cured the problem on ours and has been fine for several thousand miles now.

As a second check make sure you don't have any leaks on the inlet side from either the large or small hoses that are under the airbox. Those caused us misfire problems too on a different occasion.
Click to expand...


I did read this a few times so I gave it a try but the way you have put it is slightly different procedure ... but what I actually did was rev up to 5,000 rpm two times but did not power off. I will give your procdedure a tryand post back.
 
Grab yourself a can of carb cleaner and slowly spray the intake manifold with small amounts while then engine runs.
Idle should stay the same, if it changes ever so slightly in turn with the carb cleaner, you've got a leak.
 
DrumRollChris said:
Grab yourself a can of carb cleaner and slowly spray the intake manifold with small amounts while then engine runs.
Idle should stay the same, if it changes ever so slightly in turn with the carb cleaner, you've got a leak.
Click to expand...



worth doing a visual inspection for split hoses, loose clips 1st,


then a gentle spray of carb cleaner,
I won't recommend doing it 1st / or LOTS as it'll rot the hoses in time : - {


charlie
 
My garage explained the phoenic learn as like setting the timing on an old fashioned car (if you'er old enough to remember ones with distributors like me)! Without resetting ECU's understanding of the the position of the engine rotation with respect to sparks and fuel then the symptom is apparently that you get random misfires especially at higher engine revs - anyway that's what they told me
 
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