over revving
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over revving
my rev counter has always read just under 10,000 when ticking over. lately it sometimes jumps up to 20,000 or well over 10,000. then if i rev a bit harder, comes back down to normal. anyone know why. thanks tom.
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Re: over revving
Sounds like you have a jet engine there Tom with idle speeds like thattomrostron wrote:my rev counter has always read just under 10,000 when ticking over.
Another cause (on a petrol) can be air leaks at the inlet manifold although Malcolm's thought is the most likely.
If it's a diesel, then it's a whole new ball-game...
As Xac says, we need to know the car and the engine...
Jim
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Re: over revving
You should get those extra zero's put in your pay packet!CitroJim wrote:Sounds like you have a jet engine there Tom with idle speeds like thattomrostron wrote:my rev counter has always read just under 10,000 when ticking over.
Another cause (on a petrol) can be air leaks at the inlet manifold although Malcolm's thought is the most likely.
If it's a diesel, then it's a whole new ball-game...
As Xac says, we need to know the car and the engine...
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Thanks Tom
That is a different ball-game, especially as it's a 2.1TD with an EPIC pump.
The very first port of call has to be air leaks on the fuel lines and leakoff pipes. Air in the fuel can wreak havoc with the hydraulic servos in an EPIC and in extreme cases, can cause an engine run-away So, it might well rev to 20,000 rpm under such conditions
Look for bubbles in the transulcent parts of the fuel line and check very carefully the leakoffs and fuel return line for leaks. Other old suspects are the filter housing and the primer bulb. Speaking of filters, when was the fuel filter last changed as fuel starvation my cause the problem as well through failing hydraulic pressure in the pump.
Silly question I know, but does it stop more or less immediately the key is turned off? A slight idle increase and a run-on for a split second on cutting the ignition is normal but if it revs and runs on for a few seconds this points to a failing ESOS valve in the pump. These are replacable on a DIY basis but is a 6 or 7 spanner job. The ESOS valve is a funny old thing that takes the role of stop solenoid and throttle and it has small viton tips in it that are known to break up after a long while and fail to regulate speed and stopping. These pumps do not have a conventional stop solenoid or governor; it's all done electronically by pulsing the ESOS valves inside the pump.
I hate to say this as I seem to say it for every problem these days but a Lexia diagnosis is not a bad idea. The Lexia is able to run the EPIC through a full test programme and will reveal any ESOS or timing issues the pump may have.
Despite all the gloom, it's more than likely to be nothing more than an air leak.
For the potential it has to cause a run-away, the problem needs looking into pronto.
That is a different ball-game, especially as it's a 2.1TD with an EPIC pump.
The very first port of call has to be air leaks on the fuel lines and leakoff pipes. Air in the fuel can wreak havoc with the hydraulic servos in an EPIC and in extreme cases, can cause an engine run-away So, it might well rev to 20,000 rpm under such conditions
Look for bubbles in the transulcent parts of the fuel line and check very carefully the leakoffs and fuel return line for leaks. Other old suspects are the filter housing and the primer bulb. Speaking of filters, when was the fuel filter last changed as fuel starvation my cause the problem as well through failing hydraulic pressure in the pump.
Silly question I know, but does it stop more or less immediately the key is turned off? A slight idle increase and a run-on for a split second on cutting the ignition is normal but if it revs and runs on for a few seconds this points to a failing ESOS valve in the pump. These are replacable on a DIY basis but is a 6 or 7 spanner job. The ESOS valve is a funny old thing that takes the role of stop solenoid and throttle and it has small viton tips in it that are known to break up after a long while and fail to regulate speed and stopping. These pumps do not have a conventional stop solenoid or governor; it's all done electronically by pulsing the ESOS valves inside the pump.
I hate to say this as I seem to say it for every problem these days but a Lexia diagnosis is not a bad idea. The Lexia is able to run the EPIC through a full test programme and will reveal any ESOS or timing issues the pump may have.
Despite all the gloom, it's more than likely to be nothing more than an air leak.
For the potential it has to cause a run-away, the problem needs looking into pronto.
Jim
Runner, cyclist, time triallist, duathlete, Citroen AX fan and the CCC Citroenian 'From A to Z' Columnist...
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Either from a Citroën dealer costing something like £60+ or an enthusiast such as Jim or myself, whereabouts are you?tomrostron wrote:thanks jim, where would i get a lexia diagnosis, and what is the cost. thanks again. tom
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