daktona Posted October 18, 2010 Share Posted October 18, 2010 Hello, I have a strange problem with my car, an Ford Escort 1.8i 16V, 115bhp zetec, when i drive at constant speed, about 30 mph my car starts juddering, it's like is misfiring a little, it doesn't mater if I'm in 3rd or 4th gear. I have changed the leads, spark plugs (NGK with 1.3 gap), maf, lambda, filters, oil. I have an ELM 327 OBD and I plugged the car to it and the only fault was P0500 VSS malfunction, I cleared it and it didn't reappeared. Does any one know what the problem is or is anyone having the same problem ? Thanks in advance Link to comment Share on other sites More sharing options...
sidrick Posted October 19, 2010 Share Posted October 19, 2010 Does it judder at 60 or 70 mph? Link to comment Share on other sites More sharing options...
shawdreamer Posted October 19, 2010 Share Posted October 19, 2010 Does it judder at 60 or 70 mph? I think Im on the same track as Sid there. are you sure the judder is engine related? could it be running gear failure somewhere, maybe a bent drive shaft or even a slight buckle in a alloy? Link to comment Share on other sites More sharing options...
sidrick Posted October 19, 2010 Share Posted October 19, 2010 Does it judder at 60 or 70 mph? I think Im on the same track as Sid there. are you sure the judder is engine related? could it be running gear failure somewhere, maybe a bent drive shaft or even a slight buckle in a alloy? Aye. P0500 VSS malfunction is an ABS sensor which could also have been caused by an impact to one of the wheels. Visited any kerbs or pot holes at speed lately? Link to comment Share on other sites More sharing options...
daktona Posted October 19, 2010 Author Share Posted October 19, 2010 Does it judder at 60 or 70 mph?no, if i reach 40 mph or higher the car runs perfectly, the wheels and alignment were checked by an professional (not by me) and it is ok, sometimes if i stand parked and I rev the engine somewhere between 2000 and 2500 i can feel the same missfiring. Should I change the ignition coil ? Link to comment Share on other sites More sharing options...
daktona Posted October 22, 2010 Author Share Posted October 22, 2010 Could it be an clogged injector ? Link to comment Share on other sites More sharing options...
sortedgti2.0 Posted October 24, 2010 Share Posted October 24, 2010 change the coil,plugs and leads at the same time, if the coil is at fault it could pass on to the lead and then crack the plug (usualy no:1 piston) Link to comment Share on other sites More sharing options...
daktona Posted October 27, 2010 Author Share Posted October 27, 2010 Does it judder at 60 or 70 mph? I think Im on the same track as Sid there. are you sure the judder is engine related? could it be running gear failure somewhere, maybe a bent drive shaft or even a slight buckle in a alloy? Aye. P0500 VSS malfunction is an ABS sensor which could also have been caused by an impact to one of the wheels. Visited any kerbs or pot holes at speed lately?I have found the VSS sensor, it's on the gearbox attached with the speedo cable, it was an bent pin inside the connector. I have reset the ECU overnight and now the car runs extremely well. I cannot fell the juddering any more. Link to comment Share on other sites More sharing options...
daktona Posted October 28, 2010 Author Share Posted October 28, 2010 (edited) I spoke to soon, with the VSS connected my car feels like it's running with 3 pistons only, and if I drive and i release the accelerator the rpm sticks to same value for 4 - 5 second that it goes down to idle but very slowly Edited October 28, 2010 by daktona Link to comment Share on other sites More sharing options...
ekkie7 Posted October 7, 2011 Share Posted October 7, 2011 I spoke to soon, with the VSS connected my car feels like it's running with 3 pistons only, and if I drive and i release the accelerator the rpm sticks to same value for 4 - 5 second that it goes down to idle but very slowly Compression check is vital mate,this will rule out valve leakage and bore/piston rings wear,then its basically spark plugs,coil pack,leads,timing see if its electrical there will be a fault showing up,but mechanical it wont show no faults plus spark plugs leads,coilpacks dont show up as a fault as these are not sensors Link to comment Share on other sites More sharing options...
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