SteveT Posted 8June, 2014 Report Share Posted 8June, 2014 Hi all, after filling up the '76 2.7 with 98 octane the other night I seem to have developed a misfire once I get to around 3,500 revs. It idles perfectly and runs fine at lower revs, seems to be a bit more prevalent when warmed up. Is it fuel related? If not, where to start? Could be coincidental with filling the tank and not related? Link to comment Share on other sites More sharing options...
Russ Posted 8June, 2014 Report Share Posted 8June, 2014 one of your injectors will probably be clogged. I've been told hitting them clears them up then change your filter or maybe one of your plugs is fouled up might be worth doing leads/plugs at the same time too Link to comment Share on other sites More sharing options...
Russ Posted 9June, 2014 Report Share Posted 9June, 2014 Oh it could also be your fuel distributor, but I'd check the rest first I'd totally forgotten I'd gone through all this myself lol, so now I've added it to my list of work I've done. The injectors are big brass b*stards - might be worth getting them cleaned ultrasonically. lol but the time I had a misfire like that I changed my coil/leads/plugs and it cured it I've got a coil you can test out if you want - what are your leads like? also, the spark plug tool is the best thing ever. feel free to bring it round sometime if you want, i'm in clayfield (with a flat tyre ) Link to comment Share on other sites More sharing options...
SteveT Posted 9June, 2014 Author Report Share Posted 9June, 2014 They are all what came with the car so history not known, will start with plugs, leads, points, condensor and see what happens. Link to comment Share on other sites More sharing options...
Russ Posted 9June, 2014 Report Share Posted 9June, 2014 I got my bits from www.fcpeuro.com they were cheap and fast Link to comment Share on other sites More sharing options...
tazzieman Posted 9June, 2014 Report Share Posted 9June, 2014 Pull plugs and line them up for group inspection Link to comment Share on other sites More sharing options...
Caledonian Posted 9June, 2014 Report Share Posted 9June, 2014 They are all what came with the car so history not known, will start with plugs, leads, points, condensor and see what happens. As I'm just around the corner (ish) just holler if you need a manual,tools etc. plenty of advise on tap also not sure if its any good though Link to comment Share on other sites More sharing options...
SteveT Posted 12June, 2014 Author Report Share Posted 12June, 2014 Fixed it. Well temporarily at least. I cleaned the points and voila. I have a new set on order from James along with a couple of relays to keep,as spares. When the parcel arrives I will see how large my hands really are. Not much room to work and the points are towards the back of the distributor. The crowded bit not the uncrowded bit of course. Link to comment Share on other sites More sharing options...
Caledonian Posted 12June, 2014 Report Share Posted 12June, 2014 Quite satisfying when you solve a problem on your car, even the small ones... Link to comment Share on other sites More sharing options...
SteveT Posted 13June, 2014 Author Report Share Posted 13June, 2014 Ok I'm over the romance of points ignition. Car was running fine, then started misfiring again. Cleaned the points. Wouldn't even start. Cleaned again, starts and runs perfectly. Next day has misfire at low revs and fine at higher revs. James is currently researching breakerless ignition for me. I have my fingers crossed that I can do something at a reasonable price and be free of ignition points for ever. Link to comment Share on other sites More sharing options...
Russ Posted 13June, 2014 Report Share Posted 13June, 2014 Pertronix. Link to comment Share on other sites More sharing options...
Caledonian Posted 13June, 2014 Report Share Posted 13June, 2014 Ok I'm over the romance of points ignition. Car was running fine, then started misfiring again. Cleaned the points. Wouldn't even start. Cleaned again, starts and runs perfectly. Next day has misfire at low revs and fine at higher revs. James is currently researching breakerless ignition for me. I have my fingers crossed that I can do something at a reasonable price and be free of ignition points for ever. Totally agree, had motorbike years ago with 2 sets of points! and the same problems. Bought bolt on kit to replace them for around $200, which was a lot of dosh at the time but it was worth every cent. I would have a look at Russ's suggestion as I'm sure he would have researched it extensively, I don't google stuff on Porsches any more I just ask Russ:) Link to comment Share on other sites More sharing options...
webrest Posted 13June, 2014 Report Share Posted 13June, 2014 I agree with Russ, go with Petronix. They pretty much are the aftermarket yardstick. I'm sure there are other brands out there that are made from billet something or other especially for Porshes with the appropriate price tag but why quack in to their little game. I have no need on my 3.2 but I have used on various others and it is set and forget stuff. Still have Petronix on my old Thunderbird though and it is the beez kneez. Easy to fit too. When you open the packet for the first time though you wounder why they are so expensive, there is nothing to the kit. You can't make them at home though. Link to comment Share on other sites More sharing options...
SteamWolf Posted 13June, 2014 Report Share Posted 13June, 2014 Remember folks, 9 out of 10 fuel problems causing misfires are due to the ignition system Not sure on best options for the 911 but I'd have thought the SC 3.0 distributor with a bosch igniter (valiant/sigma/magna) would be an easy and cost effective swap. Link to comment Share on other sites More sharing options...
Russ Posted 13June, 2014 Report Share Posted 13June, 2014 Going to the SC messes with your CDI and tacho I think Link to comment Share on other sites More sharing options...
SteveT Posted 17June, 2014 Author Report Share Posted 17June, 2014 James suggested Pertronix. All up and with a new hi voltage coil and freight it's around $350. But I still have an old distributor with old shaft and bushes. I did get on to a local guy with great references that will build a full electronic, refurbished, dissy for $800 - $900 using easy to get VW electronic internals and new bushes etc. The current plan is that now the old fart has a new set of points (and battery, the old one died yesterday) is to just drive and enjoy for a while. Link to comment Share on other sites More sharing options...
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