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Misfiring on one cylinder

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Misfiring on one cylinder

Postby breakwater » 13 Mar 2017 16:23

Recently purchased Patrol 1998 4.5 GRX,my second Patrol. Occasionally on starting or whilst running drops one cylinder. Three weeks with Nissan and no cure.
All new plugs,plug leads,rotor,distributor cap,distributor serviced, injectors cleaned by Bosch,new fuel pump, air filter clean. After a few ks or minutes it usually comes right.
All computer diagnosis stats as per Nissan spec.
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Re: Misfiring on one cylinder

Postby hugejp » 13 Mar 2017 17:05

Sticky valve??
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Re: Misfiring on one cylinder

Postby Tinus lotz » 13 Mar 2017 17:46

Give graham a call but sounds like maf or sticky valve to me....
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Re: Misfiring on one cylinder

Postby Michael » 13 Mar 2017 19:49

Have they measured the compression?
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Re: Misfiring on one cylinder

Postby Wilkie » 13 Mar 2017 22:25

That sounds like all of the above....and
on top of the inlet manifold towards the fire wall side there are two air valves from tappet cover ..clean them out and free of carbon built-up....and
see if your car has got a uni chip in ..that's how they start when they are about to give trouble :think: :think:
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Re: Misfiring on one cylinder

Postby Michael » 14 Mar 2017 05:46

Ek is nou nie n petrol expert nie, maar as die intake manifold lek op een van die ports en hy suig lug daar kan hulle so maak?

I would do the following, when its cold and misfiring, pull the plug wires one by one untill you get to the cylinder that has the misfire. At least if you know which one has the misfire you can focus on that one area to find the problem.
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Re: Misfiring on one cylinder

Postby hugejp » 15 Mar 2017 09:31

Has the mystery been solved??
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Re: Misfiring on one cylinder

Postby breakwater » 15 Mar 2017 17:07

Guys

Thanks for all the tips. I will get round to all of them in time. I have started adding Valve eeze to all petrol fills and so far the problem seems to be absent but I suspect that will only be temporary. As you will all know getting to the plug leads 4,5 and 6 is not the easiest thing in the world especially for an oldie at the side of the road .
I have some reservations about the air control monitor valve and there is a company in Jburg called On line car parts who said they would supply me with one for a fraction of Nissan charges (R 12000) but I am in Richards Bay and not quite sure that what they would supply me with,probably Chinese would do the trick or even fit correctly.

Anybody any experience of these people ?

Many thanks once again

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