Citroen Xsara Picasso engine lumpy running on tickover
Variant: 1.6 twin cam petrol
Model Year: 2005
Categories:
Electrics, ECU, Warnings & Lights
bought the car a few days ago, tickover was lumpy from cold start and a backfire when reved so changed timing belt water pump etc. problem still there, took down to local garage to have codes read and came up with rpm sensor. the problem is I just cannot find the damn thing. I would just like to know what it is, what does it do and where it is on the engine.
Posted: Jul 11, 2017 (7 years ago)
IT's more usually called a crankshaft position sensor,
And yours is down the front where the gearbox and engine meet.
Two wire plug,
Brown - Red and Green- red.
And yours is down the front where the gearbox and engine meet.
Two wire plug,
Brown - Red and Green- red.
Posted Jul 11, 2017 (7 years ago)
not a question but a word of thanks. for the quick reply. will investigate . would this create a backfire , ? once again , many thanks for your help.
Posted Jul 11, 2017 (7 years ago)
Easier to post this than explain all causes of backfire , might help you .
https://www.2carpros.com/articles/engine-backfires-while-running
https://www.2carpros.com/articles/engine-backfires-while-running
Posted Jul 11, 2017 (7 years ago)
Hmm,
Backfires are caused by a number of different things,
The CAS is basically a signal generator.
It makes a signal from the rotating engine with a "blip" in the signal that corresponds to where Cyl#1 is at Top dead centre.
From this signal "blip" the cars computer can decide where to signal the spark plug ignition.
This is basic operation and is actually way more complex than this.
But without access to very expensive test 'scopes you only option is renew the CAS and see if it fixes the fault.
Backfires are caused by a number of different things,
The CAS is basically a signal generator.
It makes a signal from the rotating engine with a "blip" in the signal that corresponds to where Cyl#1 is at Top dead centre.
From this signal "blip" the cars computer can decide where to signal the spark plug ignition.
This is basic operation and is actually way more complex than this.
But without access to very expensive test 'scopes you only option is renew the CAS and see if it fixes the fault.
Posted Jul 12, 2017 (7 years ago)
Basically , when crank sensors fail it results in non start .You can try cleaning and checking wiring / connection to sensor .
Posted Jul 12, 2017 (7 years ago)
problem solved... replaced the crank sensor. tickover back to nice and smooth no backfire...... many thanks for the very sound advice. ron.
Posted Jul 12, 2017 (7 years ago)
Glad you got it fixed , thanks for updating the forum .
Posted Jul 13, 2017 (7 years ago)
ok. solved the lumpy tickover problem ,, now we have another ( believe it or not) just had the car plugged in and the coolant temp sensor came up. so, paid our very friendly main dealer to purchase said item........ the problem I have now is where the flippin eck does it fit can't find the damn thing anywhere any help would be very much apreiciated
ron.
ron.
Posted Jul 24, 2017 (7 years ago)
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