neville Posted February 27, 2005 Share Posted February 27, 2005 Having done 100 trouble free miles on Saturday, I was innocently checking my engine over today on tickover for leaks etc when without warning the revs suddenly shot up, the engine sharted running as rough as nails with lots of pops and bangs and flames emerging from the exhaust! The exhaust flames subsequently subsided but the 900rpm tickover has been replaced by a 1600 rpm one and it still runs horribly rough with induction side pops and bangs. Its an 1800 zetec with jenvey tb's. Nothing mechanical has obviously broken - any ideas guys? Thanks Neville Quote Link to comment Share on other sites More sharing options...
Thrustyjust Posted February 27, 2005 Share Posted February 27, 2005 throttle pot moved on the side of the jenveys? Quote Link to comment Share on other sites More sharing options...
neville Posted February 27, 2005 Author Share Posted February 27, 2005 Could be as I was reaching over to hand blip the throttle at the time and got the distinct impression that something may have moved. As a complete mechanical dunce - can someone explain how i might I check/rectify this possibility? Thanks Quote Link to comment Share on other sites More sharing options...
Thrustyjust Posted February 27, 2005 Share Posted February 27, 2005 first check to see if the throttle pot(small black unit with wires hanging out) is loose on the end of the right hand throttle body.If it moves,then you could try and move it about to get it to zero better and then re-tighten,or read through your info on the ecu to see about resetting the throttle pot to zero. Quote Link to comment Share on other sites More sharing options...
steppenwolf Posted February 27, 2005 Share Posted February 27, 2005 If the Throttle Pot has moved then you really need to set it's position up again using the correct software ( for example Easimap if you have an MBE ECU ). What make is your ECU? If it is an MBE unit, I can tell you what the idle voltage from the pot should be. It is very important that you get this start point correct as an error here will be reproduced throughout the map! Quote Link to comment Share on other sites More sharing options...
CedricTheBrave Posted February 28, 2005 Share Posted February 28, 2005 you have proably just dislodged the throttle cable and got it stuck on the ferrule on the end make sure thats all correct before you start undoing the throttle pot it can be a pain to reset correctly Quote Link to comment Share on other sites More sharing options...
neville Posted February 28, 2005 Author Share Posted February 28, 2005 Having checked things out this morning, I can't see anything visibly amiss with what I think from the description above is the throttle pot. The ECU is an MBE - can't remember the number off the top of my head (I'm at work! but its something like 986! Quote Link to comment Share on other sites More sharing options...
neville Posted March 11, 2005 Author Share Posted March 11, 2005 I finally tracked the problem down and am reporting back in the interests of completeness and in case anyone else falls foul of the same problem in the future. With the benefit of hindsight the problem was maddeningly obvious and took about two seconds to effect a cure! There is a clip at the top of the throttle linkage between the TB's which presses against a lever which in turn controls the opening of the front two TB's. I'd somehow disloged the clip so that it sprang out of position, with the result that the front two TB's were operating out of sync with the others. Obvious really! Quote Link to comment Share on other sites More sharing options...
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