jonesy Posted July 28, 2019 Report Share Posted July 28, 2019 Tr6 woes for the last 2 years I have been having problems with the car not running smooth as car gets hot when under load runs well but in traffic a bit hesitant after a visit to a tr specialist in Cheshire car ran better for a short while then car started back firing they advised me to change the metering unit as mine looked like the original one we did this and the ran checked injectors after a couple of sets of reconditioned injectors car wouldn't start rac came out and diagnosed metering unit had siezed and on inspection it had and shattered plastic doggle sent the unit back and it was repaired or replaced just less than 12 months later I took the car back to Cheshire specialist they removed electronic ignition and put it back on points car seem to run better got back home the car seemed to run lumpy following week took car short run the car cut out on me but started and then cut out again rang rac waited 2 and half hours for them to come I was only five minutes away from home he couldn't get the car going towed it back my brother in law came next day with a rotor arm and got the car going in minutes sent the part back to Cheshire and asked for a refund a week later took car for a run cut out we found the second metering unit has siezed but this hasn't damaged the doggle but sheared the pedestal /distributor drive side I managed to locate one at a cost of 120 pounds I have asked metering unit supplier to meet this cost they've refused and are saying petrol is responsible for the metering units failure after asking if I put any additives into it I am very angry and disappointed with the service of people who advertise in the magazine and aren't providing the service we are expecting any advice greatly appreciated from a very frustrated Jones Quote Link to post Share on other sites
Paul Hill Posted July 28, 2019 Report Share Posted July 28, 2019 (edited) Wow big rant and I can see you are really pi££ed. I would sourse a really good expert to fix your MU problems they are out there, tell us where you are and people will help Edited July 28, 2019 by Paul Hill Quote Link to post Share on other sites
k_raven_smith Posted July 30, 2019 Report Share Posted July 30, 2019 How often is the car used as I have recently had experience of modern fuel going off and causing metering unit seizure. I advise customers that don't use the car much to keep fresh fuel in it and start the engine every month to keep the pi equipment in the best condition Quote Link to post Share on other sites
Pogo Posted July 30, 2019 Report Share Posted July 30, 2019 Some of these issues are very similar to a problem I had a few years ago (on my way to TRchaeology) that was simply no breather hole in a new (to me) petrol filler cap. Tthe car ran really well for a time and then started to run really roughly. Stop for a while messing with things and it started again (obviously the tank pressure had gone down). Had the AA out and replaced plugs, plug leads and distributor cap. Car ran OK again. Drove from Cheshire down to Salisbury with no major issues. I found it by chance when I stopped to fill up and when I opened the filler cap there was a wooshing sound. From then on I left the filler cap slightly open and had no further issues. Changed the seal on the filler cap on my return home and all was well. Worth a look. Good luck Rog Quote Link to post Share on other sites
Peter Cobbold Posted July 30, 2019 Report Share Posted July 30, 2019 Has fuel pressure been checked ideally when driving but shearing the dog and shaft suggests the MU rotor might be seizing due to lack of fuel. Quote Link to post Share on other sites
Andy Moltu Posted July 30, 2019 Report Share Posted July 30, 2019 Interestingly in days gone by the drive dog was once well known for shearing but until this I'd not come across it for years. Quote Link to post Share on other sites
Peter Cobbold Posted July 30, 2019 Report Share Posted July 30, 2019 1 hour ago, Andy Moltu said: Interestingly in days gone by the drive dog was once well known for shearing but until this I'd not come across it for years. On the other hand, mine never failed in 150k miles of daily driving '78 to '88. PI was very reliable indeed, fuel pump started to weep towards the end but still worked. Peter Quote Link to post Share on other sites
powel1g Posted July 30, 2019 Report Share Posted July 30, 2019 I also had a metering unit seize up. Similarly it sheared the end of the drive from the distributor pedestal. replacement driveshafts of decent quality were hard to come by at the time. following this event I was advised two things: put a shallow saw cut around the plastic drive dog to encourage it to fail rather than the steel drive. dont use fuel additive ( suggestion was, something in the additive can cause the rotor to bind) I have no idea if that is accurate but haven’t used additive since. Put the savings in a tin ready for hardened valve seats in the future. regards Gav Quote Link to post Share on other sites
Mike C Posted July 30, 2019 Report Share Posted July 30, 2019 8 hours ago, k_raven_smith said: How often is the car used as I have recently had experience of modern fuel going off and causing metering unit seizure. I advise customers that don't use the car much to keep fresh fuel in it and start the engine every month to keep the pi equipment in the best condition Modern fuels are certainly a lot more aggressive than anything the Lucas PI system would have been designed for. If the metering unit was rebuilt with original elastomers I can see them quickly failing . Maybe a damaged elastomer jammed somewhere in the MU and caused the drive to fail? Quote Link to post Share on other sites
jonesy Posted August 3, 2019 Author Report Share Posted August 3, 2019 Thanks for all the advice Quote Link to post Share on other sites
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