fiesta rs 1800 lambda problem
18-04-2009, 09:11 PM
#1
Advanced PassionFord User
Thread Starter
fiesta rs 1800 lambda problem
hi ive got a fiesta rs 1800 which has developed a running problem , the engine at low revs struggles then at 2500rpm comes in at full power
. ive changed the spark plugs , coil pack , leads , injectors seals , gaskets , checked for air leaks , changed the fuel filter , tps all with genuine ford parts , fitted all this 2 day and its still bad so i decided to unplug the lambda sensors and it drives perfect
, could it be as simple as a lambda fault , surely that would make the car run poor as it adjusts the fueling for the cat, how safe is it to run the car without the lambda sensor unplugged?
any help would be most greatful
cheers paul
. ive changed the spark plugs , coil pack , leads , injectors seals , gaskets , checked for air leaks , changed the fuel filter , tps all with genuine ford parts , fitted all this 2 day and its still bad so i decided to unplug the lambda sensors and it drives perfect
, could it be as simple as a lambda fault , surely that would make the car run poor as it adjusts the fueling for the cat, how safe is it to run the car without the lambda sensor unplugged?any help would be most greatful
cheers paul
19-04-2009, 07:07 PM
#3
Virgin
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Hi Paul
I appear to be having a similar problem and have posted my problem on the forum:
I have just converted my CVH powered Westfield SE from Carburettor to EFI, due to strict German environmental laws. Basically I have taken the complete engine, loom and control system from a donor XR2i car. Everything is now installed into position and the engine is running, however it is running very rich (CO2 = 2.3%) with all sensors connected. When I unplug the lambda sensor the engine runs better (in emergency limp home mode I guess).
Since initial posting I have replaced the Lambda, Coolant Temp & Air Temp Sensor the engine is now running slightly better, my next option is to replace the Throttle Possition Sensor. I'm hopping that this is the route cause for the engine running rich as there arnt any other options.
Basically to answer your question: It should be safe for a short time to unplug your Lamda as the EEC will automatically run the engine a little richer than normal (Basically to prevent the engine from running too lean and melting the valves & pistons etc). With the lambda unplugged your fuel consumption will increase and your emissions will be outside limits. Note: a rich running engine will increase the degredation rate of your Cat, so fit a new Lambda ASAP. They arent so expensive I bought a universal one off EBay for 13 quid.
I appear to be having a similar problem and have posted my problem on the forum:
I have just converted my CVH powered Westfield SE from Carburettor to EFI, due to strict German environmental laws. Basically I have taken the complete engine, loom and control system from a donor XR2i car. Everything is now installed into position and the engine is running, however it is running very rich (CO2 = 2.3%) with all sensors connected. When I unplug the lambda sensor the engine runs better (in emergency limp home mode I guess).
Since initial posting I have replaced the Lambda, Coolant Temp & Air Temp Sensor the engine is now running slightly better, my next option is to replace the Throttle Possition Sensor. I'm hopping that this is the route cause for the engine running rich as there arnt any other options.
Basically to answer your question: It should be safe for a short time to unplug your Lamda as the EEC will automatically run the engine a little richer than normal (Basically to prevent the engine from running too lean and melting the valves & pistons etc). With the lambda unplugged your fuel consumption will increase and your emissions will be outside limits. Note: a rich running engine will increase the degredation rate of your Cat, so fit a new Lambda ASAP. They arent so expensive I bought a universal one off EBay for 13 quid.
Last edited by vonwoodster; 19-04-2009 at 07:39 PM.
20-04-2009, 06:26 PM
#4
Advanced PassionFord User
Thread Starter
sorted it on sunday lads went down the scrappers and got 4 for £2 banged one in and its running fine , the only thing thats pissed me off and that got me thinging it might not just be the lambda sensor was that i brought a brand new bosch universal sensor about 5 months ago and it cost me £75 so it looks like it must be faulty , thanks anyway lads
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