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juddering at constant speed


daktona
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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

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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?

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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?

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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 ?

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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.

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  • 11 months later...
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

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