Englishmaninwales Posted July 24, 2003 Share Posted July 24, 2003 Apologies if common question. 1994 1.4 supersport. Current plug =NGK BCP 7ES. Seems to be prone to fouling eg after long overrun downhill or in slow traffic. Probably 6k old. Gap is correct. New HT leads. I plan to try a plug replacement. Any recommendations? Thanks Malcolm Link to comment Share on other sites More sharing options...
Bare Posted July 24, 2003 Share Posted July 24, 2003 If Memory serves: with NGK a lower Number is a hotter plug.. it sounds like this is worth trying on your engine, as ngk's are v resistant to fouling.. assuming the appropriate heat range is installed. Try a "6" plug .. in NGK of course ;-) Link to comment Share on other sites More sharing options...
Peter Carmichael Posted July 24, 2003 Share Posted July 24, 2003 I suggest you have some other problem because many many engines at that power level use BCP7ES. Link to comment Share on other sites More sharing options...
Peter Carmichael Posted July 24, 2003 Share Posted July 24, 2003 Bare, you are right that NGK have a consistent numbering for temperature and 6 would be 1 hotter, but I really doubt that this is the root cause of the problem. Link to comment Share on other sites More sharing options...
captain chaos Posted July 24, 2003 Share Posted July 24, 2003 Sounds more like a fueling issue rather than plug. Link to comment Share on other sites More sharing options...
Smegnoguk Posted July 25, 2003 Share Posted July 25, 2003 Keep talking. My 1999 1600 Vauxhall Classic runs fine until it gets hot (80 degrees C) say on a run down the A3. When I get back to traffic speeds (30 to 40 mph) it runs very badly with missed beats, flat spots etc. Makes you drive it with your foot down just to keep the power coming reasonably smoothly. Last tuned by James Whiting a couple of months ago so I am completely flummoxed. Who's looking at the Ferrari? Nobody, that's who! Link to comment Share on other sites More sharing options...
Sootysevener Posted July 25, 2003 Share Posted July 25, 2003 Had the same problem myself and worked my way down from "8"s to "5"s with no improvement . Eventually tracked it down to over rich idle mixture on the carbs. Colortune sorted it and went back to "sevens" as it seemed appropriate. Check them regularly and stayed spot on for last 2k David Link to comment Share on other sites More sharing options...
Smegnoguk Posted July 26, 2003 Share Posted July 26, 2003 Sooty sevener, Hello. Sounds as though yo may have a solution but I am slightly confused. What is "7" ? Is it a main get size? Is Colortune something you get from Halfrauds or somebody you call in like Ghost Busters? Going to have a twiddle with the idle jets first thing tomorrow I presume the plugs will tell me if I am doing any damage (such a very weak mixture) Who's looking at the Ferrari? Nobody, that's who! Link to comment Share on other sites More sharing options...
Englishmaninwales Posted July 27, 2003 Author Share Posted July 27, 2003 Bare, Peter and Captain Chaos. Thanks for the advice. Problem solved. New rotor arm, and now no misfire. Malcolm Link to comment Share on other sites More sharing options...
wonkey eyed barmaid Posted July 28, 2003 Share Posted July 28, 2003 smegnog, i presume from reading these posts that the '7' you enquire about is actually a component of the spark plug part number. as in "NGK BCP 7 ES" and has nothing to do with the jets or carbs. a coloutune is a 'device' used to set the mixture on carbs. speaking of colourtunes and carbs settings. i think i would like to have my carbs checked over, balanced and set up properly as i think they are running too rich and i have a big hesitation around 3000-3200rpm (overfuelling when going from idle jets to main jets 🤔) Ive been quoted about £40 + vat to have them done at a garage - but thats the same price as a syncrometer from tweeks.... should i get the syncro and learn to do it myself, or have it done in the garage 🤔 how easy is it to get right 🤔 Link to comment Share on other sites More sharing options...
wonkey eyed barmaid Posted July 28, 2003 Share Posted July 28, 2003 p.s i have the dave andrews guide to webber carbs, and have had a wee play before. I am fairly mechanically minded, but unsure as to how to tell if i had it right or not? do syncrometer come with good instructions? do i need a colourtune too, or is it essentially the same thing? cheers. Link to comment Share on other sites More sharing options...
Simos Posted July 29, 2003 Share Posted July 29, 2003 A synchronometer just balances the airflow between throats i.e. balance between the carbs which is adjusted by balance screw on the throttle linkage. This is set before twiddling with the jetting etc. A syncho won't help you with jetting. A colortune is a device (from mem) like a sparkplug with a window which allows you to see the colour of the burn in the cylinder. Nice blue colour required ? Tuners use an exhaust gas analyser such as CO2 ppm to judge how the mixture is burning as it goes through the rev range on the rollers. There are doubtless other ways too... Link to comment Share on other sites More sharing options...
Nigel Riches Posted July 30, 2003 Share Posted July 30, 2003 Colortune may get you close but a rolling road session will get it a lot closer, as the motor will be running against a load, rather than just pumping gases, plus agood RR session should check a lot more than just the fuelling, ie plug voltage, cranking voltage, ignition timing / dwell, fuel pressure, etc, and be sure to get a before and after read out, although you will be able to feel the difference in the seat of your pants, worth every penny, Nigel. 1982. 5 speed, clamshells. B.R.G / Ali. The True Colours. Link to comment Share on other sites More sharing options...
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