Nissan Micra Engine problem. Juddering

2001 Nissan Micra Problem

CarNissan Micra 1.0 s
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A bit of history of the car first. It's petrol 1 litre s. manual gear. I had it converted 2 LPG few yrs bak and it has been running in both petrol very well for last 4 yrs. now when I canary the car on petrol it Downey accelerates and engine light starts blinking. But as soon as you convert it to LPG it runs like normal. Even on motorway it goes upto 70-80mph on LPG but not more den 50-60mph on petrol and that takes really long as well. I had this sort of problem before so I had it checked and we replaced coils once. This time I had it checks. When mechanic removes the electrical wire from the cool pack on d 1,3 & 4th at pistons it judders which is normal but 2nd piston from the left it does not judders. I had all 4 coil packs replaced. Hav also replaced the air flow sensor. Have checked all the electrical wiring and everything seems to be fine. Neither mechanic not me are able to understand why the car judders on petrol and not on LPG. Please help!
Problem Category
Engine, Cooling System & Drivetrain

Electrics, ECU, Warnings & Lights

Running Rough, Starting & Power Loss

Solution 1
roverman | Driver | Since: Apr 2013 | Posts: 0 | Fixes: 392 | View Garage
Suggested Solution

i would check engine compression before you go any further if ok could be a petrol fuel injector at fault if compresion is low on cylinder 2 it is more than likely a burnt out valve on that cylinder or valve seat recession way to check without dismanteling is to check valve clearences see if they have closed up

Posted on Thursday 13th of June 2013
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