Ernest Posted September 18, 2021 Report Share Posted September 18, 2021 Hi In order to overcome a lumpy running problem I took the car to a specialist tuning company. They diagnosed problems with a couple of P.I injectors and so they fitted 6 news one, but then found one of these to be faulty so replaced it. The car was fine for about 20 miles than the lumpy running returned as before the work. I, and the garage, are assuming that one or two of the new injectors are faulty. But are injectors as unreliable as this? Can anyone recommend a quality injector supplier? Best Wishes Ernest Quote Link to post Share on other sites
astontr6 Posted September 18, 2021 Report Share Posted September 18, 2021 17 minutes ago, Ernest said: Hi In order to overcome a lumpy running problem I took the car to a specialist tuning company. They diagnosed problems with a couple of P.I injectors and so they fitted 6 news one, but then found one of these to be faulty so replaced it. The car was fine for about 20 miles than the lumpy running returned as before the work. I, and the garage, are assuming that one or two of the new injectors are faulty. But are injectors as unreliable as this? Can anyone recommend a quality injector supplier? Best Wishes Ernest When you replace any of the injectors, you must ensure that each injector line is fully bled of air. I suspect that this is what happen to you other than air in the injector line. Years ago the Lucas CAV dealer near me used to hold the injector line vertical to back fill each injector line with petrol using a WSCO oil can filled with petrol before he screwed the injector on. This method was also used when he changed the M/U. No 10 minutes of cranking and swearing? Bruce. Quote Link to post Share on other sites
harrytr5 Posted September 18, 2021 Report Share Posted September 18, 2021 I personally prefer KMI in Bedfordshire (not to say negative on any others) and have been dealing with them for years when Ken Mills owned the firm before retiring and family relations took over. kmipetrolinjection.co.uk Just a happy customer. Regards Harry Quote Link to post Share on other sites
Waldi Posted September 19, 2021 Report Share Posted September 19, 2021 As Bruce indicates, do a 2nd attempt in venting the fuel lines. I kept the lines vertical, with the pump running, and tapped on each line (many times) with my free hand until no more air bubbles came out. I helps to full out the injector needles now and then during this process. I also cracked the engine (2nd person) every now and then, but not continuous. Important: take lead from coil during all this! Neil Revington refurnished my entire injection gear, he did an excellent job for me. Waldi Quote Link to post Share on other sites
Ernest Posted September 19, 2021 Author Report Share Posted September 19, 2021 Thanks Bruce, Harry, and Waldi for the useful advice and recommendations. The car goes back to the garage next Thurs. Ernest Quote Link to post Share on other sites
StuartG Posted September 20, 2021 Report Share Posted September 20, 2021 Is the "specialist tuning company" familiar with the Lucas injection system ? If they are not you could end up paying for their learning curve ! Quote Link to post Share on other sites
Mike C Posted September 20, 2021 Report Share Posted September 20, 2021 About the best thing I have ever had done to my TR was having the injectors and MU tested and calibrated by a Lucas expert on a Lucas test bench. Transformed the car. Quote Link to post Share on other sites
Ernest Posted September 20, 2021 Author Report Share Posted September 20, 2021 I do have some confidence in the tuning company - the are involved in preparing racecars and other types of quite specialist tuning. But I will take on board comment by Stuart and Mike so thanks for this. Ernest Quote Link to post Share on other sites
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