Alan Reeves Posted May 26, 2017 Share Posted May 26, 2017 Dura 175, ive been a little concerned with occasional blips when pootling around town but its fine when opened up. rich?Also aware of a bit of hunting on tick over and last night was very pronounced- 1200 dropping to around 7/800 and feels like it will cut out but it revives ...up and downnot consistentany pointers?alan Link to comment Share on other sites More sharing options...
JNC Posted May 26, 2017 Share Posted May 26, 2017 Possibly TPS faulty ! Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 26, 2017 Member Share Posted May 26, 2017 I'd exclude a few simple things before getting to the control systems. Any recent changes or work? Has it been washed or out in the rain? All HT connections nice and snug? Throttle actuation nice and smooth all the way along the mechanical bits?Jonathan Link to comment Share on other sites More sharing options...
Tom_Arundel Posted May 26, 2017 Share Posted May 26, 2017 Disconnect lambda sensor/probe and try it again, if better, get new lambda sensor.Ok to run without it if you need to Link to comment Share on other sites More sharing options...
Jim 123 Posted May 26, 2017 Share Posted May 26, 2017 Lambda is a good starting point. Have you had the plugs out? The tips should all be dry and burning with a light grey / straw discolouration. Link to comment Share on other sites More sharing options...
ChrisC Posted May 26, 2017 Share Posted May 26, 2017 Access to an MBE lead would help to see the actual problem. If you don't have a battery isolator, try an ECU reset (disconnect the battery of 1 min, or unplug the ECU), Then be careful not to press the accelerator before starting. Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 27, 2017 Author Share Posted May 27, 2017 thanks will try those tipsI have done no work on the car but the battery was disconnected a couple of weeks agoJNC do you have the MBE lead to check ? Link to comment Share on other sites More sharing options...
JNC Posted May 27, 2017 Share Posted May 27, 2017 Sorry Alan no ! , I was told by the two Steves the TPS is a cheep and nasty item and fail often . Saying that mine has been fine . My reason for thinking it's the TPS is if the ECU is not seeing or an intermittent signal the engine will hunt. Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 27, 2017 Author Share Posted May 27, 2017 Ta john, I will go and get one anyway.. Link to comment Share on other sites More sharing options...
ChrisC Posted May 27, 2017 Share Posted May 27, 2017 Mine is a jäger at idle, I have tried the reset, and the TPS signal is fine, I have the lead to check. I am concerned there is no adjustment in the TPS position, mine likes to sit at throttle position 2, when at idle, I am sure this should be 0. All the sensors look fine, the "hunt" for a solution continues. Link to comment Share on other sites More sharing options...
Alan Archer Posted May 27, 2017 Share Posted May 27, 2017 His car is dry shampooed only and has never ever been out in the rain, honestly my lord. Link to comment Share on other sites More sharing options...
John Vine Posted May 27, 2017 Share Posted May 27, 2017 Alan, YHM.JV Link to comment Share on other sites More sharing options...
slap_ed Posted May 27, 2017 Share Posted May 27, 2017 A while back mine used to fluctuate at tick over. It used to yoyo between 850 and 1300 at tick over. I took it to Caterham Donnington under warranty and all they did was to adjust the tick over screw as if you wanted to lower the tick over speed. You'd think this would make it stall but it didn't, it settled the tick over speed to a much smoother 950 rpm. Maybe doing this helped to align/lower the throttle site better. It might not work for you but it certainly did for me. Worth a try?Maybe mark the position of the stop screw before you try it so you can restore its position in case it doesn't work. Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 28, 2017 Author Share Posted May 28, 2017 When u have finished the shampooing alan you can come and do mine.things to try after the weekend .... Link to comment Share on other sites More sharing options...
Alan Archer Posted May 28, 2017 Share Posted May 28, 2017 You missed the point Mr Reeves, has it only started after the nasty rain we encountered last week? Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 28, 2017 Author Share Posted May 28, 2017 No it's been there since I got it back but last Thursday was very noticeable.... Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 29, 2017 Author Share Posted May 29, 2017 one spark plug out, very rusty !! Link to comment Share on other sites More sharing options...
ChrisC Posted May 29, 2017 Share Posted May 29, 2017 For reference, my hunting was caused by a high idle screw. It was ok after PBC and IVA, but has got worse since 500 miles. I am guessing it's a combination of the engine freeing up and increasing the rpm into a range where the ECU gets confused. Incidentally I didn't notice the rpm rise because the R spec tacho seems to read 1100 rpm regardless of the actual rpm below that figure seen on the MBE ECU, I.e 700 - 1100 all read 1100 on the tacho. I am sure this is because the needle is vertically pointing down at 1100 rpm. Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 29, 2017 Author Share Posted May 29, 2017 another posting, a spark plug body has parted and left embeded in the head!! Link to comment Share on other sites More sharing options...
John Vine Posted May 29, 2017 Share Posted May 29, 2017 Do you mean the ceramic plug body has broken off, leaving the metal hex body in the head? If so, you can still undo the plug but extracting it will require long thin tweezers or forceps.ETA: Or has the entire plug sheared off, leaving just the threaded portion in the head?JV Link to comment Share on other sites More sharing options...
Alan Reeves Posted May 29, 2017 Author Share Posted May 29, 2017 john ive posted a couple of others on this, confusing everyone no doubtthe thread and tip were left in the head, all the ceramics came out in one piece TF....sorted , catch you when you get backalan Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 29, 2017 Member Share Posted May 29, 2017 So at least one plug was rusty. What does the inside of the connectors look like?Jonathan Link to comment Share on other sites More sharing options...
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