Nissan Micra Technical Advice Request on; - K11 Micra Misfire, at 30 MPH Only

1996 Nissan Micra Problem

CarNissan Micra k11 1000cc
Ownermicra paul
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Hi all,

This 1996, 1000cc. with 68K miles only, consistently misfires between 27 to 33 MPH under various load conditions. Backing off the throttle can minimise the misfire but not eliminate it. Apart from this, the vehicle starts & drives normally. Does not burn any oil or lose any water, both are uncontaminated.

Remedies tried without success are:

Checked wiring, plug connectors, fuses/holders, & all engine bay earth lug points.
Cleaned TB. MAF. hot wire & air temp sensor with IPA.
Re-soldered TB. 6 terminals for hot wire / temp.
New plugs / HT lead set & new petrol filter.
Cleaned out distributer, rotor & cap segments.
Fitted s/h replacement TB. & Distributor.
Set timing @ 15 deg. Advance with strobe, as per Haynes manual.
Charging alternator volts steady at 13.8 V maximum.
Never had a check engine light.

Noticed that the timing advance is unstable in that it snatches rapidly towards maximum when the RPM is gradually increased from steady idle tick over to 1500 RPM approx ?
Timing is not erratic on throttle snap opening & snap closing, not scattered. Chain rattles a little but does appear to scatter the timing under the strobe.
Exhaust tail pipe is clean & shiny indicating a rather lean running mixture for an old car. ECU.,controls timing, but cannot see this at fault as vehicle performs normally in all other instances.
Now out of ideas. Need a more logical test & evidence gathering procedure going forward.
Any proactive ideas please ?
Micra Paul

Problem Category
Engine, Cooling System & Drivetrain

Electrics, ECU, Warnings & Lights

Leaks & Noises, Interior and Bodywork

Running Rough, Starting & Power Loss

Solution 1
bustedknuckles | Driver | Since: Nov 2011 | Posts: 2 | Fixes: 1461 | View Garage
Suggested Solution

They are prone for timing chain wear issues ,but first wold check injectors and sensors on camshaft and engine speed ,same sensor so swap them and see what changes

Posted on Friday 30th of November 2012
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