pjc615ukuk Posted July 10, 2023 Report Share Posted July 10, 2023 Had a good few years of trouble free motoring until recently. After it emerged from hibernation this spring, I had an awful job actually starting it, but got it going eventually... Went on a run for about a mile and the engine stalled. On starting up again, it was backfiring like something from the Somme! Eventually got going again, though felt a bit lumpy? Gave it a good run (80 mile round trip) and after a spirited blast, it stalled on decelerating, and refuse to start for about half an hour. Drove approximately 20 miles home without further incidents. Yesterday I eventually managed to start it and backed out of the garage. It felt like it wasnt running on all cylinders, but then started backfiring badly, then stalled. It's now refusing to start. Turning over fine, just won't fire up. I'm clueless with cars, and my local TR specialist garage are booked up for a month! A chap on a local classic car fb page has suggested the coil could be the culprit? 1971 CP model. Lucas / Bosch pi system Quote Link to post Share on other sites
elclem1 Posted July 10, 2023 Report Share Posted July 10, 2023 Fuel tank full of crud? Quote Link to post Share on other sites
charlie74 Posted July 10, 2023 Report Share Posted July 10, 2023 Could be the coil; they’re easy enough to swap and see. Make sure all wire connections are good. Fresh fuel to dilute old might help as well… Quote Link to post Share on other sites
RobH Posted July 10, 2023 Report Share Posted July 10, 2023 Have you got electronic ignition or points? Quote Link to post Share on other sites
pjc615ukuk Posted July 10, 2023 Author Report Share Posted July 10, 2023 40 minutes ago, elclem1 said: Fuel tank full of crud? That is always a possibility I guess? Quote Link to post Share on other sites
pjc615ukuk Posted July 10, 2023 Author Report Share Posted July 10, 2023 39 minutes ago, charlie74 said: Could be the coil; they’re easy enough to swap and see. Make sure all wire connections are good. Fresh fuel to dilute old might help as well… Old fuel has been well and truly been diluted, as I've probably put 40 ltrs ( and used most of it) since the problem started. Quote Link to post Share on other sites
pjc615ukuk Posted July 10, 2023 Author Report Share Posted July 10, 2023 35 minutes ago, RobH said: Have you got electronic ignition or points? Good old fashioned points supplied by the Fuel Doctor. Red rotor arm too! Quote Link to post Share on other sites
RobH Posted July 10, 2023 Report Share Posted July 10, 2023 If you haven't already done it, it would be worth checking the points gap and that the flexible wire inside the distributor is OK. Quote Link to post Share on other sites
harrytr5 Posted July 10, 2023 Report Share Posted July 10, 2023 Diesel ? Would not be the first thats for sure Regards Harry Quote Link to post Share on other sites
Mike C Posted July 10, 2023 Report Share Posted July 10, 2023 (edited) Any fuel dripping from the MU? Could be modern fuel has got to your fuel control diaphragm over winter. Edited July 10, 2023 by Mike C Quote Link to post Share on other sites
elclem1 Posted July 11, 2023 Report Share Posted July 11, 2023 Do you have the kit to test fuel pressure to the MU? it needs to be 90psi bosch pump 110psi lucas pp. I had a friend who had dodgy bosch fuel pump conections and cleaned up the contacts on the pump and solved it. symptoms were every now and again the pressure would drop causing the car to stall.- fuel starvation...... Clem Quote Link to post Share on other sites
Mk2 Chopper Posted July 11, 2023 Report Share Posted July 11, 2023 Check the spark plugs, might be sooted up, bad gaps or in poor condition. Gareth Quote Link to post Share on other sites
TR NIALL Posted July 11, 2023 Report Share Posted July 11, 2023 2 hours ago, elclem1 said: Do you have the kit to test fuel pressure to the MU? it needs to be 90psi bosch pump 110psi lucas pp. I had a friend who had dodgy bosch fuel pump conections and cleaned up the contacts on the pump and solved it. symptoms were every now and again the pressure would drop causing the car to stall.- fuel starvation...... Clem Interesting to see those 2 figures quoted Bosch@90psi and Lucas@110psi always thought the Bosch was in or around 106psi. Quote Link to post Share on other sites
elclem1 Posted July 11, 2023 Report Share Posted July 11, 2023 Hi Niall, I have always set mine to 90 psi never had a problem. Perhaps other people will come forward and suggest a pressure. will you be going to the show in Aug? The set up is on my 5 BEFORE the body goes on. Clem Quote Link to post Share on other sites
TR NIALL Posted July 11, 2023 Report Share Posted July 11, 2023 1 minute ago, elclem1 said: Hi Niall, I have always set mine to 90 psi never had a problem. Perhaps other people will come forward and suggest a pressure. will you be going to the show in Aug? The set up is on my 5 BEFORE the body goes on. Clem Hi Clem yes it will be interesting to see what pressure others use and what difference it makes it was Malcom at Prestige who recommended the 106 to me when he refurbished my MU in 2000 and it’s been set at that since. Yes I’ll be at Shepton with the usual Gang and hoping for a good Weekend I’m sure our Paths will cross at some stage,Enjoy. Quote Link to post Share on other sites
elclem1 Posted July 11, 2023 Report Share Posted July 11, 2023 probably the Tea shop AKA bar Quote Link to post Share on other sites
pjc615ukuk Posted July 11, 2023 Author Report Share Posted July 11, 2023 2 hours ago, Mk2 Chopper said: Check the spark plugs, might be sooted up, bad gaps or in poor condition. Gareth Plugs have only done a little over 1k miles? I took them out, and other than being a little wet, they looked a good colour? Cleaned them and put them back. Still wouldn't start! Quote Link to post Share on other sites
pjc615ukuk Posted July 11, 2023 Author Report Share Posted July 11, 2023 1 hour ago, TR NIALL said: Interesting to see those 2 figures quoted Bosch@90psi and Lucas@110psi always thought the Bosch was in or around 106psi. Hi Nial. Malcolm at Prestige fitted the Bosch pump about 6 years ago, so guessing he will have set it to 106psi? Quote Link to post Share on other sites
pjc615ukuk Posted July 11, 2023 Author Report Share Posted July 11, 2023 10 hours ago, Mike C said: Any fuel dripping from the MU? Could be modern fuel has got to your fuel control diaphragm over winter. Hi Mike. I'm guessing that's another possibility? I only ever fill up with Shell V-Power E5, and have replaced / diluted the overwintered fuel with probably around 40 ltrs of fresh fuel. Quote Link to post Share on other sites
Mk2 Chopper Posted July 11, 2023 Report Share Posted July 11, 2023 20 minutes ago, pjc615ukuk said: Plugs have only done a little over 1k miles? I took them out, and other than being a little wet, they looked a good colour? Cleaned them and put them back. Still wouldn't start! Ok that's good, have you checked you have a spark when cranking the engine over? Gareth Quote Link to post Share on other sites
Mike C Posted July 11, 2023 Report Share Posted July 11, 2023 41 minutes ago, pjc615ukuk said: Hi Mike. I'm guessing that's another possibility? I only ever fill up with Shell V-Power E5, and have replaced / diluted the overwintered fuel with probably around 40 ltrs of fresh fuel. I add Stabil over winter now- that solved my previous spring restart problems. If the MU fuel control diaphragm has gone fuel will leak from the base of the MU. Quote Link to post Share on other sites
elclem1 Posted July 11, 2023 Report Share Posted July 11, 2023 If there is no spark that's easy to check, hold a spare spark plug against the block and get someone to crank the engine if its electronic. Or take off the dizzy cap and get someone to crank the engine. see if there is a spark between the points. only way to make sure you have the correct fuel pressure is to fit a pressure gauge on the outlet of the fuel pump. Don't assume! clem Quote Link to post Share on other sites
Steve-B Posted July 11, 2023 Report Share Posted July 11, 2023 Have you pulled injectors 1-2-5 and had someone turn the key to make sure you have fuel spray coming from them? 2 & 5 I've learned can be problematic as they're on the back of the MU and their seals are first to go. If you don't have a good circular spray, check by pulling the injector needle our and see if there's any fuel coming out. Quote Link to post Share on other sites
cp25616 Posted July 12, 2023 Report Share Posted July 12, 2023 Peter you have a PM. Alan G Quote Link to post Share on other sites
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