Citroen Xsara Picasso engine lumpy running on tickover

2005 Citroen Xsara Picasso Problem

Ref#20495
CarCitroen Xsara Picasso 1.6 twin cam petrol
Year2005
Ownerlyron
Posted11/07/2017
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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.
Problem Category
Engine, Cooling System & Drivetrain

Electrics, ECU, Warnings & Lights


Solution 1
1/4drive | Auto Insider | Since: Jun 2011 | Posts: 25 | Fixes: 1539 | View Garage
Suggested Solution

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.


Posted on Tuesday 11th of July 2017
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From Original Poster
lyron | Driver | Since: Jul 2017 | Posts: 0 | Fixes: 4 | View Garage
Suggested Solution

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 on Tuesday 11th of July 2017
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Solution 2
whittingehame | Legend | Since: Oct 2009 | Posts: 444 | Fixes: 11464 | View Garage
Suggested Solution

Easier to post this than explain all causes of backfire , might help you .

https://www.2carpros.com/articles/engine-backfires-while-running


Posted on Tuesday 11th of July 2017
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Solution 3
1/4drive | Auto Insider | Since: Jun 2011 | Posts: 25 | Fixes: 1539 | View Garage
Suggested Solution

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.


Posted on Wednesday 12th of July 2017
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Solution 4
whittingehame | Legend | Since: Oct 2009 | Posts: 444 | Fixes: 11464 | View Garage
Suggested Solution

Basically , when crank sensors fail it results in non start .You can try cleaning and checking wiring / connection to sensor .


Posted on Wednesday 12th of July 2017
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From Original Poster
lyron | Driver | Since: Jul 2017 | Posts: 0 | Fixes: 4 | View Garage
Suggested Solution

problem solved... replaced the crank sensor. tickover back to nice and smooth no backfire...... many thanks for the very sound advice. ron.


Posted on Wednesday 12th of July 2017
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Solution 5
whittingehame | Legend | Since: Oct 2009 | Posts: 444 | Fixes: 11464 | View Garage
Suggested Solution

Glad you got it fixed , thanks for updating the forum .


Posted on Thursday 13th of July 2017
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From Original Poster
lyron | Driver | Since: Jul 2017 | Posts: 0 | Fixes: 4 | View Garage
Suggested Solution

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.


Posted on Monday 24th of July 2017
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