Khyber > Missing with Bosch 4 tip plugs in 4th gear

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Handbrake (Handbrake) 2012-02-15 09:25:42 +0500 #1

Hi Guys

Hope someone would be kind enough to advice.

I drive a Khyber with engine in really good condition. Used Bosch 4 tip Plugs. The problem I am facing is as soon as I switch to 4th gear (around 90kms - on CNG) car starts missing and looses acceleration. But once its over 120 it goes to 140 without any hiccups. Also i noticed full throttle is causing the missing. A slow and gradual acceleration prevents missing but then I loose all the tempo gained from first 3 gears. Have no issue on Petrol-Runs smooth.

Any advice as what could be wrong and How can I get it tuned.

Really appreciate.

ToxicDevil (ToxicDevil) 2012-02-15 09:41:34 +0500 #2

I am not sure but you spark plug gap may be too much. You need to decrease it.
and i my opinion you should have used normal plugs or iridium ones

Handbrake (Handbrake) 2012-02-21 13:08:24 +0500 #3

Thanks ToxicDevil.

It turned out that one of the Tappet was jammed. Now when the 'missing' is fixed, the 4 tip plugs work fine however a little extra consumption. Though a better pick!