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Old 28-01-2009   #16
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Re: Rough running

It makes your engine misfire



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Old 28-01-2009   #17
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Re: Rough running

Nice one Robot!

Shouldn't you be at work?
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Old 28-01-2009   #18
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Re: Rough running

Nah, I'm done for today
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Old 28-01-2009   #19
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Re: Rough running

I'd say that's your throttle position sensor:
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Old 28-01-2009   #20
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Re: Rough running

Do you think it is likely to be the culprit or just a red herring?
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Old 28-01-2009   #21
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Re: Rough running

Need to 'stroke check' it and measure the values against spec to find out really. If you're unlucky you can spend a fortune fixing cheap problems if you replace bits on hunches.
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Old 28-01-2009   #22
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Re: Rough running

What year is your car Ad? are all the TPS units the same across the years? If so I should be able to measure mine on saturday so you can compare.
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Old 28-01-2009   #23
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Re: Rough running

My car is a 2000 'X reg'. Thanks guys.
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Old 29-01-2009   #24
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Re: Rough running

I called Fiat today and they said that the throttle position sensor is part of the throttle body and can only be purchased as a complete unit. Bearing in mind it is an exchange unit they want £331+vat! I think I'll spend some more time diagnosing.

Ad.
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Old 29-01-2009   #25
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Re: Rough running

Forgot to mention, the car doesn't misfire when or hesitate when cold. Not sure if this will be any help though!

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Old 29-01-2009   #26
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Re: Rough running

Have you considered moving to a colder place then?
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Old 29-01-2009   #27
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Re: Rough running

It's cold enough here! But seriously When the engine heats up it starts misfiring.
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Old 29-01-2009   #28
Rosso Corsa of corsa!!!
 
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Re: Rough running

Quote Originally Posted by Robot View Post
LRB seems to have gone missing. Probably something to do with a combination of wife, hatchet, and unfinished hall
Hey guy's, as Rich says I am working 200 miles away from home at the moment and am not getting much time to play - work, work, work! Cannot complain too much at the moment as there are lots of people who would give their right arm to be earning!

My initial thought is that you have a gummed up idle valve, when you checked it was the gasket intact? Mine had a similar issue, I cleaned the idle valve up and noticed that the gasket had torn, 1/2 a tube of instant gasket later and job done!

The other thing it sound like it condensation in one of the plug leads or water in one of the plug bores. Again this happened to me about this time last year when I was doing lots of short trips, I suffered from condensation under the plug cover - ran like a bag of bolts until I dried everything out.

Careful of looking too hard for a serious problem, the b's have a habit of presenting a serious issue that turns out to be a loose wire or water where it should not be!!
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Old 29-01-2009   #29
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Re: Rough running

Ad, I spend my time thinking up wierd scenarios and seeing whatg comes out so here is what my imagination has come up with tonight!

So when the engine is cold, the ECU should richen the combustion mixture - dependant upon how hot the coolant is. It can only do this by increasing the duration the injectors are energised. As it warms up, this "choke" effect is reduced as the coolant warms up. If the engine is too lean it will misfire and be hesitant.

Now, imagine the injectors are blocked slightly.....when the injectors are firing for longer, more fuel goes through so the effect is not noticed but when the normal fueling occurs, the blockage is restricing the fuel delivery too much. Thus I would try injector cleaner for a few tanks and see what happens.

Well, its good theory anyway but may be complete crap!!!!
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Old 29-01-2009   #30
Rosso Corsa of corsa!!!
 
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Re: Rough running

Quote Originally Posted by Robot View Post
LRB seems to have gone missing. Probably something to do with a combination of wife, hatchet, and unfinished hall
Actually, just thought of one of the other common causes of this. The temperature sender switch on the thermostat housing can cause this, I have heard of it a couple of times - the switch controls the fuel mixture, if the switch fails the car runs rich resulting in it missing at low revv's.

HTH
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