Rizzo80 Posted November 10, 2018 Author Report Share Posted November 10, 2018 So ive changed map sensor oxy sensor ht leads & plugs. Still running rough and showing missfire cylinder 1 & 4 😬😬😬 any ideas ? But no EPC light anymore yaaaaaaaaaaaaaaaay FML Quote Link to comment Share on other sites More sharing options...
Rich Posted November 10, 2018 Report Share Posted November 10, 2018 Cam or crank sensor. Quote Link to comment Share on other sites More sharing options...
Rizzo80 Posted November 10, 2018 Author Report Share Posted November 10, 2018 More money 😫 Quote Link to comment Share on other sites More sharing options...
Rich Posted November 10, 2018 Report Share Posted November 10, 2018 Have you tried the green temp sensor yet? Quote Link to comment Share on other sites More sharing options...
Rizzo80 Posted November 10, 2018 Author Report Share Posted November 10, 2018 No not yet, its on the possible list. Could this be a problem ? Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 11, 2018 Report Share Posted November 11, 2018 Nah. Try the crank and cam sensor tests. Now you have the diagnostics thing and you can clear faults, do the old school trick of disconnecting sensors while the engine is running. If the engine note changes or kills it, sensor is probably ok... engine 'can' run on either cam or crank alone, but ideally needs both. So run with one disconnected then start it (if you can) and disconnect the other, and then switch round. There's some very clever software in them ECUs, which means it will always try to keep the engine going to get you home even if there are multiple faults. Older ECUs just gave up and you were left stranded by the side of the road for the tiniest of faults. But cars still have only one ECU... no redundant systems like in an aircraft. And now new car steering and brakes are controlled by that one ECU while you're charging down a motorway. I don't like it. Quote Link to comment Share on other sites More sharing options...
Rich Posted November 11, 2018 Report Share Posted November 11, 2018 (edited) I used to have an e32 750, that had two ECUs. Edited November 11, 2018 by Rich Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 11, 2018 Report Share Posted November 11, 2018 That's a new one on me. Both for engine? Like one being redundant, complete with two sets of sensors....? Quote Link to comment Share on other sites More sharing options...
Rich Posted November 11, 2018 Report Share Posted November 11, 2018 A twelve cylinder operating as two six cylinders. Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 11, 2018 Report Share Posted November 11, 2018 Uh, ok. I guess they ran out of injector drive circuits. When i worked on a V12 jag, the brits managed everything on one ECU, but it didn't have sequential injection. 4 banks of 3 or 3 banks of four. Can't remember... Quote Link to comment Share on other sites More sharing options...
Rich Posted November 11, 2018 Report Share Posted November 11, 2018 The Brits don't make cars. Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 11, 2018 Report Share Posted November 11, 2018 Not any more. Or at least not Brit owned companies. Quote Link to comment Share on other sites More sharing options...
Rich Posted November 11, 2018 Report Share Posted November 11, 2018 Because they did silly things. Doubling the management (Bosch) was clearly the way for a twelve but then this was an 87 Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 11, 2018 Report Share Posted November 11, 2018 Yeah... Could've used 3 four cyl ecus.... Quote Link to comment Share on other sites More sharing options...
LR5V Posted November 11, 2018 Report Share Posted November 11, 2018 it was x2 six cylinder engines together - there was an 8 series, could be M8 with v12 engine - throttle bodies on each bank Quote Link to comment Share on other sites More sharing options...
Rizzo80 Posted November 11, 2018 Author Report Share Posted November 11, 2018 😐 Quote Link to comment Share on other sites More sharing options...
Rizzo80 Posted November 14, 2018 Author Report Share Posted November 14, 2018 So after new leads plugs map sensor still a missfire. But ive found sone concerning pipes. So the bottom one is a vacum pipe right ? So that has elec tape on it . So surely that must be it now ? Still showing P0106 MAP whuch is part of the vacum ?? And the red tape. Is that why the brakes are **** ? Quote Link to comment Share on other sites More sharing options...
Rich Posted November 14, 2018 Report Share Posted November 14, 2018 You could be onto something here. Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 14, 2018 Report Share Posted November 14, 2018 (edited) There was a recall for cracked vacuum brake pipe ends... across the entire vdub range around '99 era i think (found out a year ago). If air is being sucked in elsewhere, a map/maf sensor will give a correct reading, but obviously wrong.... on a mk2 i once had a misfire, but at idle only. Drove me nuts. Ran sweet as most of the time. The vacuum pipe to the brakes was on cyl 4 inlet duct. No problem. But in this case the short rubber hose joining the vacuum pipe to the manifold had a tiny almost invisible split. This allowed air in, which dliuted down the mixture to cyl 4. So no. 4 misfired because there wasn't enough fuel in the mix which entered the cylinder. Too lean..... but once the manifold pressure rose, under load, the tiny amount of air made no difference, since 99% of the mix came from the carb. All the symptoms suggested headgasket failure, leaky exhaust valve or a hot running spark plug (it was paler than the others). Edited November 14, 2018 by mk2 Quote Link to comment Share on other sites More sharing options...
Rizzo80 Posted November 14, 2018 Author Report Share Posted November 14, 2018 So what part is this, having a hard time trying to find the pipe that connects to it Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 14, 2018 Report Share Posted November 14, 2018 Looks like a breather vapour separator, but not sure as i haven't worked on this model... @Rich what d'ya reckon? Quote Link to comment Share on other sites More sharing options...
Rich Posted November 14, 2018 Report Share Posted November 14, 2018 Stupid one way valve, I like it as I once had a non starting car and someone had spun it 180. Shame I was so far into stripping it for another theory when I noticed otherwise quick money maker. Quote Link to comment Share on other sites More sharing options...
mk2 Posted November 14, 2018 Report Share Posted November 14, 2018 What's it for? Quote Link to comment Share on other sites More sharing options...
Rich Posted November 15, 2018 Report Share Posted November 15, 2018 No idea. Quote Link to comment Share on other sites More sharing options...
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