antonio Posted July 28, 2015 Share Posted July 28, 2015 good eveninga friend did something wrong with his engine and the car won't start....or start and idle/run poorly.i know he did touch the "idle screw" on the roller barrel to get the engine hot quicker...i assume the TPS value at idle is not right because we have no fuel coming out the injectors when trying to fire up the engine.ECU is a old MBE unit, and the probleme is i haven't got the MBE interface to set up the TPS value correctly.is it possible to reset this value without conecting the ECU to a laptop? something like the standard rover ECU...merci Link to comment Share on other sites More sharing options...
SM25T Posted July 28, 2015 Share Posted July 28, 2015 Is the inertia switch tripped ? Is the immobiliser LED red light flashing ? Can you hear the fuel pump running when the ignition is on ? Link to comment Share on other sites More sharing options...
antonio Posted July 28, 2015 Author Share Posted July 28, 2015 salut Ian!yes, we can easily start the car with the help of very little brake cleaner... and from time to time engine would start as it should (albeit it runs poorly) on it's own.when engine is running, the mixture is wrong (black smoke, bangs and rattles)apart from the RB, he hasn't touched anything. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted July 28, 2015 Member Share Posted July 28, 2015 I wouldn't put brake cleaner in my 7's intake. For diagnosis I'd consider a commercial starting preparation or diethyl ether.Jonathan Link to comment Share on other sites More sharing options...
ECR Posted July 28, 2015 Share Posted July 28, 2015 If he has just increased the tickover the engine should still run fine. Are you/he sure that he hasn't adjusted the balance screw by mistake ? Link to comment Share on other sites More sharing options...
antonio Posted July 28, 2015 Author Share Posted July 28, 2015 he may have... he is a muppet when it comes to do something on his car....but at the first sight the rollers looked evenly adjusted but i will double check tomorrow night. Link to comment Share on other sites More sharing options...
SM25T Posted July 28, 2015 Share Posted July 28, 2015 Is he hoping to come to Classic Days this weekend ? Link to comment Share on other sites More sharing options...
Paul Deslandes Posted July 28, 2015 Share Posted July 28, 2015 which MBE ECU does he have - 956, 967 - and what engine and year? Setting the TPS is not difficult although it helps if you can connect it to a PC running Easimap. Otherwise it can be done with a voltmeter/multimeter. Unfortunately MBE don't have an automatic procedure for TPS adjustment, you have to set the idle voltage by hand.Unless it has a very odd map, even if the TPS is at its 'idle' setting, there should still be fuel coming from the injectors. Is the fuel pump running for a couple of seconds after ignition switch on?Unless he undid something else I'd be surprised if just tweeking the roller barrel idle setting would cause the symptoms you describe. Link to comment Share on other sites More sharing options...
antonio Posted July 29, 2015 Author Share Posted July 29, 2015 yes... and going to Corse for two weeks on monday..... Link to comment Share on other sites More sharing options...
antonio Posted July 29, 2015 Author Share Posted July 29, 2015 paul, issue appened after a bleeding procedure so very lillte chance he touched anything else.i'll have a look tonight at idle voltage valuedon't know the exact MBE year, but i rebuilt the engine last year Link to comment Share on other sites More sharing options...
Paul Deslandes Posted July 29, 2015 Share Posted July 29, 2015 It was the MBE model and the engine type I was after, although the procedure is much the same for all.Normally the MBE TPS idle voltage is set to 360mV (0.36V) although different mappers sometimes choose different voltage settings and TPS voltage/mapping site curves.If the engine will start and run, get it good and warmed up and then measure the TPS voltage, either with a meter or Easimap on a PC. Slacken the TPS clamping screws and turn the TPS back so that the voltage stays well below 360mV and adjust the throttle idle to the correct revs. This makes sure that it's idling at site zero. Then adjust the TPS so that the voltage is 360mV.If it won't start or run, it can be that the TPS setting is too high and the fuelling and ignition are over fuelling and/or over advanced (or retarded) respectively. So do as above, adjust the throttle body idle screw so that the throttle is slightly open, then set the TPS to 360mV and tighten the clamp screws. It should then start unless something else is wrong. Once hot, setup as above.If it won't start because it's been overfuelling, wash the plugs out with carb cleaner, it's the only way I've found of cleaning them quickly unless you leave them for hours to dry out, and even then......Paul Link to comment Share on other sites More sharing options...
antonio Posted July 29, 2015 Author Share Posted July 29, 2015 merci paulwill report tonightcheers Link to comment Share on other sites More sharing options...
antonio Posted July 29, 2015 Author Share Posted July 29, 2015 hi paul!all sorted, but it seems like the previous owner never bothered to get a decent map sorted. my friend has disturbed a little the TPS when refiting the thermostat... i had to set the idle at around 0.6 volts because the map is completly wrong under this value... i hope my friend will manage to use the car for his holiday.thank you for your help and for all your advices chaps!antonio Link to comment Share on other sites More sharing options...
SM25T Posted July 29, 2015 Share Posted July 29, 2015 Good news. Link to comment Share on other sites More sharing options...
Paul Deslandes Posted July 30, 2015 Share Posted July 30, 2015 ooh, sounds horrible. I'd be very worried about the ignition and fuelling maps being liable to melt the engine, he could end up with all sorts of trouble. I suggest you issue a health warning.bonne chancePaul Link to comment Share on other sites More sharing options...
antonio Posted July 30, 2015 Author Share Posted July 30, 2015 all will be sorted after his trip on a RR. he has been using the car this way for two years know... despite my advice to make it right after i rebuild the engine! Link to comment Share on other sites More sharing options...
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