Best spark plug choice???

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dave409787
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Best spark plug choice???

Post by dave409787 » Sun Mar 30, 2014 4:07 pm

Wondering if someone could point me in the right direction.

Fitted a new exhaust and oil change, all good and van was running fine, a little splutters at high revs, but not noticeable.

Since then, 2 days ago, I have replaced the front tinware but blocked all the holes in the front tinware, that is the only change. It now splutters all the way?

It feels like it is restricted, or like the choke is on? Excessive power loss and struggles with any hills! I'm stumped to how this can suddenly change over night?

It is a 1641dp running twin solex.

Any ideas what may have happened?

Thanks in advance. :D
Last edited by dave409787 on Tue Apr 01, 2014 9:59 pm, edited 1 time in total.
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Re: Sun is shining and the bus is running rough????

Post by dave409787 » Mon Mar 31, 2014 1:17 pm

Still the same today even when the suns not shining. :(

Any ideas?
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Re: Sun is shining and the bus is running rough????

Post by e m p i » Mon Mar 31, 2014 2:03 pm

Check you haven't disturbed the leads as you've been working on it. Make sure they are plugged into the top of the dizzy cap properly and also check the points gap ect.

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Re: Sun is shining and the bus is running rough????

Post by dave409787 » Mon Mar 31, 2014 2:32 pm

Yeah, cheers lee. Checked my leads first as it does feel like its running on 3, but all good, and on electronic ignition so not points either???

Really strange as it was fine the day before. :?
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Re: Sun is shining and the bus is running rough????

Post by dave409787 » Tue Apr 01, 2014 10:37 am

The VW specialist near me is fully booked till 1st May!!!

Any ideas what i can look at first??... not sure i can last a month without! :(
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Re: Sun is shining and the bus is running rough????

Post by JacksHere » Tue Apr 01, 2014 11:08 am

:( does one of the manifolds feel cold? Ie determine which side or cylinder may not be firing?

I've checked leads before and thought they were all ok, one seemed fine when curved for my test, but was failing when connected to the engine. Only found out by luck while retesting.

I've had a distributer that had turned in the past, also have you checked your timing?


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Re: Sun is shining and the bus is running rough????

Post by dave409787 » Tue Apr 01, 2014 12:56 pm

will check it out later on, many thanks.

Have some spare leads so may try a few options. If lead was playing up, would that mean one cylinder was maybe not firing and that side manifold would run colder? Makes sense. If they are all warm, does that rule out the leads?
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Re: Sun is shining and the bus is running rough????

Post by dave409787 » Tue Apr 01, 2014 2:22 pm

Ah, front right is cold!

So I guess that means lead or plug? Could it be anything else?
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Re: Sun is shining and the bus is running rough????

Post by JacksHere » Tue Apr 01, 2014 2:49 pm

I'd temporarily swap the lead to the other plug on that side and see if the problem follows,
Otherwise, take the plug out, if it has any visible sign of damage (being hit by the cylinder) then wait for someone else to reply... You could make things worse by getting it to fire?

You can rule out fuel, as the other cylinder on the same carb appears to be firing (as its warm)

If the plug works fine on the other cylinder, take the valve cover off that side and see what happens with the valves opening and closing when you turn the engine by hand, but I'm guessing a failed cylinder/valve would make the manifold very hot?


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Best spark plug choice???

Post by dave409787 » Tue Apr 01, 2014 9:58 pm

Mate, thanks so much for your help today, love the help i get from this forum, gives me the confidence to fix problems myself saving me money and this time.... time too!

I had switched the lead over already and all the same, pulled the plug and it wasn't giving a spark... A new one and she's running like a dream. Surprised as those plugs were all new about 500 miles ago. Wondering if I should change them all?

I now have a mix of Bosch and ngk equivalent. Any opinions on the best choice for a 1641 running twin carbs?
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Re: Best spark plug choice???

Post by OP » Wed Apr 02, 2014 8:22 am

dave409787 wrote:Mate, thanks so much for your help today, love the help i get from this forum, gives me the confidence to fix problems myself saving me money and this time.... time too!

I had switched the lead over already and all the same, pulled the plug and it wasn't giving a spark... A new one and she's running like a dream. Surprised as those plugs were all new about 500 miles ago. Wondering if I should change them all?

I now have a mix of Bosch and ngk equivalent. Any opinions on the best choice for a 1641 running twin carbs?
Bosch plugs by any chance??

NGK's all the time for me these days.
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Re: Best spark plug choice???

Post by dave409787 » Wed Apr 02, 2014 9:37 am

Yeah they were Bosch, now have one Ngk in, will change them all over now.

Do you use the B5HS?
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Re: Best spark plug choice???

Post by JacksHere » Wed Apr 02, 2014 9:13 pm

Nice one, bet that was a relief 8)
B5HS sounds right.

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Re: Best spark plug choice???

Post by OP » Thu Apr 03, 2014 8:45 am

dave409787 wrote:Yeah they were Bosch, now have one Ngk in, will change them all over now.

Do you use the B5HS?
:wink:

Japanese NGK's v Chinese Bosch, only one winner. A mate made the same mistake, put new Bosch in and had misfire problems. Took them out and cleaned up the German Bosch ones he had in before and all was fine. Unless you can find German plugs then avoid. I've used NGK for years in all my cars with no issues :)
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