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Mi16 1,9 Misfire Between 3000-4000 Rpm


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10 replies to this topic

#1
johnny and

johnny and
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Joined: 16 Mar 2010
Hi
I have somewhat of a strange problem - and I have had it for a year now. blink.gif
My MI16 has a very heavy misfire between 3000-4000 rpm.
I suspect it to be related to the ignition as the rev counter jumps up and down like crazy when it misfires.

Below 3000 it runs perfectly and above 4000 it also runs perfectly. On a few occasions it has stopped the misfired - but started again
I have put on:
A new ignition module
Another MAF
New spark plugs.

I have ordered a new ignition coil to see if that would do the trick.

Do you have other suggestions

Cheers wink.gif

#2
mi8 turbo

mi8 turbo
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jst a few other suggestions maybe try new leads dizzycap n arm.

#3
calvinhorse

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  • Location:Derbyshire
do you know anyone who has a 1.9 mi16 you could borrow there ecu to try?
has the timing been altered?
are the plug leads the right way round biggrin.gif
is the fuel filter in good condition?
are the injectors in good condition?
if it has 2 ignition moduals try swapping them over, sound silly but works

and the number 1 way to stop an mi16 missfiring- use super unleaded fuel!

#4
johnny and

johnny and
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Dizzy cap and arm change - no succes
Timing belt checked - no succes
Only 1 ignition module.
Is running on super :-)
I will see if I can borrow a ECU from someone:-)
This week I will also change the Ignition Coil and mayby also the Leads.

Thanks so far - I will keep you updated :-)

#5
mi8 turbo

mi8 turbo
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corroded faulty wiring. what rating are the plugs are they standard or are they higher or lower heat range than recomended

Edited by mi8 turbo, 10 May 2011 - 09:57 AM.


#6
B1ack_Mi16

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Something odd with the shielding of the wiring to the TDC sensor?

Maybe some interference of some other signal kicks inn about 3-4000rpms and engine misfires.

#7
Furio

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QUOTE (B1ack_Mi16 @ May 10 2011, 01:21 PM) <{POST_SNAPBACK}>
Something odd with the shielding of the wiring to the TDC sensor?

Maybe some interference of some other signal kicks inn about 3-4000rpms and engine misfires.


Sounds very plausible to me. MI's haven't been new for ages. So a shielding fault or perished wire coatings wouldn't be surprising at all. But bugger me as to what else kicks in in at around 3-4000 rpm.
I'd start giving all connectors a thorough check due to it being a fairly simple job. If that doesn't do it, I'd check the harness starting at the ecu and branching out from there - connector by connector. A tedious job but there is really no way around it.

Enjoy tongue.gif

#8
johnny and

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I have now put on yet another new ignition module - and that has helped a lot.

It still isn't a 100% so I think I will check all connetions - as electrical design is NOT a strong feature on french cars :-)
Thanks so far

#9
Mr Teflon

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Speaking from experience.

Check the distributor cap, rotor arm and ht leads very carefully. Any cracks/splits or signs of corrosion could be at fault.

Also, get some new thermal paste on the rear of the ignition module.

#10
B1ack_Mi16

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I also remember the ECU on my old mi16 often had some water trapped inside.

When this happened it would start to behave strange, misfiring and strange behaviour in general.

I just opened it and cleaned the inside, put togeather and it was fine afterwards.

#11
Haze

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I had a very similar problem, could even be the same, the fault was the ecu... Things that did help were ignition parts rotor, cap, leads and plugs. Didn't change the ignition module as these I've heard will not give any indication of failing they will mostly fail and make the car unable to start.