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Old 5 Days Ago   #1
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Correct spark plugs for 1.1 - 2006

Recently I changed the spark plugs from NGK R to DCPR7E-N-10 (4983) for my 1.1 2006 (January 2016) and car started to misfire on low rpm while accelerating.

Old: NGK R, there wasn't a problem with them.

New: DCPR7E-N-10 (4983), misfire on low rpm while accelerating
Manual: BKR5EZ

Old and new spark plugs differ from those in the manual because of the thread size and gap. There is a big confusion about these spark plugs and I see that many questions are asked on this forum about them. I couldn't get a definite answer.

These DCPR7E-N-10 (4983) are everywhere listed as correct ones but misfire started right after they were fitted. What could went wrong? Can someone help me with correct ones?
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Old 5 Days Ago   #2
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Re: Correct spark plugs for 1.1 - 2006

Sometime around the end of 2005 or the beginning of 2006 the plugs changed to ones with a smaller thread diameter, on 1.1 and 1.2. This may have happened at the same time as the change from square to round oil cap, but that's just a guess. The handbooks, as always take some time to catch up, mine also states the old ones, although the engine takes the new ones. I've been replacing these annually for the last ten years without any problems. Your new plugs are unlikely to be the cause of your problems.

When you changed the plugs, you did not remove BKR5EZ so that you could fit DCPR7E-N-10. The ones you removed must have been DCPR7E-N-10, or equivalent form another manufacturer.

All Panda and Punto 8v engines suffer from ageing plug leads. They deteriorate, and break down, eventually causing a misfire, which can destroy the coil if left unfixed. They tend to stick to the plugs and be difficult to remove, so at plug change time, disturbing them could be the trigger for them to fail. It might be as simple as them not being attached to the plugs securely. If the plug cover has moved along the cable, the connector may not be secure, or even touching the plug terminal, so the spark has to jump that gap before it reaches the plug electrode gap. That'll strain the coils very quickly.

Are the plugs fitted properly? I have seen plugs that have not been tightened properly. The gasket washer does nto just seal the plug, but is an important part of the heat path to maintian correct plug running temperature. A gasket that is not squashed properly can make a plug run hotter than it should, which can lead to a holed piston. Do not overcompensate and overtighten.

Why did you change the plugs? Was this a routine service, or was there a problem ther already, and is not fixed, but you are focussing on the only new part?

"NGK R" may be a plug type, but is not a specific part number. Whatever they are must have at least been the correct thread size. Perhaps some more detail of those might be useful, and the reason not to replace like with like. Had those been fitted by you, or a previous owner to try to 'fix' a misfire?

If you need help, give us the detail we need.
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Old 4 Days Ago   #3
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Re: Correct spark plugs for 1.1 - 2006

if you are fitting DCPR7E-N-10 plugs
and the recommend in the manual is BKR5EZ
then the plugs you have fitted are 2 levels to cold, this means the tip will not retain the heat required for optimum cumbustion, spark plugs not only act as a spark producer but also keep the cumbustion temp to a set level keeping the engine clear of soot and other particles.
A cold plug will create a missfire as much as an overheating plug will.

this might explain it
/https://www.ngkntk.in/ngk-technology...of-heat-range/
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Last edited by 09 johno; 4 Days Ago at 10:49.
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Old 4 Days Ago   #4
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Re: Correct spark plugs for 1.1 - 2006

Quote Originally Posted by 09 johno View Post
if you are fitting DCPR7E-N-10 plugs
and the recommend in the manual is BKR5EZ
then the plugs you have fitted are 2 levels to cold
BKR5EZ has a 14mm thread diameter
DCPR7E-N-10 has a 12mm thread diameter

Might be quite a struggle to get the DCPR to stay in the head, or a struggle to get the BKR into the smaller hole.

I think the key issue here is why the plugs were changed, and if to cure a problem, why the new plugs are being suggested as the cause.

A low speed misfire is more likely an HT issue, with leads or coils, or perhaps a head gasket problem. Could also be mechanical, with valve seating issues, or piston ring failure, but much less likely on a FIRE engine.
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Old 3 Days Ago   #5
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Re: Correct spark plugs for 1.1 - 2006

put the old plugs back in ?
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Old 3 Days Ago   #6
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Re: Correct spark plugs for 1.1 - 2006

I strongly agree with Portland bill,

Change your plug leads and see if that is the cause of problem.

If problem still there you may have a faulty new plug, that said I have never had a faulty ngk spark plug.

Good idea from koala too try old plugs if you have them, What type are the old plugs?
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Last edited by jackwhoo; 3 Days Ago at 13:09.
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Old 1 Day Ago   #7
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Re: Correct spark plugs for 1.1 - 2006

New coils are cheap. Its possible the job finally finished one of them.
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