carbs

[lancialulu]

Richard

Its not backfiring but popping of unburnt fuel! most fulvias seem to do this and I have been told that a leaky exhaust that lets air in (?) increases this. I have to say my 1.3 Coupe now in safe hands up in Carlise always popped but had a very sound exhaust system. to eliminate fuel pressure issues you should buy a cheap fuel pressure meter c £10 and fit in line with carb delivery.

Tim

[thecolonel]

Be careful purchasing a fuel pressure gauge.
A lot of them are for testing purposes only
and not designed to be left "in circuit".

[lancialulu]

Re FPG - Totally agree only for testing. How could you see it as a permanent installation anyway unless plumbed to the dash board where you dont really want a fuel pipe!!

Tim

[Richard Fridd]

hi all,my sedan has developed a hesitation when accelerating gentle.if i depress the gas pedal for swifter progress the car accelerates strongly.i suspect a problem with the idle circuit .i have a new fuel pump/air filter/plugs fitted and have checked/cleaned the screws+jets which are accessible from the top.i have checked the fuel levels in the bowls which are equal.i have balanced the airflows with a meter.i suppose the accelerator pumps under the carbs could be disguising a blocked fuel filter in the tank or other restriction.advice welcome as ever.best regards richard

carbs stripped and cleaned and refitted.fuel supply good.in addition to a slight hesitation particularly when not fully warmed there is a slight 'backfiring' on the over run which i have had with other fulvias but only when lifting off from high revs.will change condenser etc with some spares unless somebody can advise otherwise.i still suspect carbs though.acceleration remains strong.i did try a richer idle mixture but not successful.advice welcome !best regards richard

have now replaced condenser/dist. cap/adjusted points.still suspect carbs-additional symptom is when coming off the gas  the idle speed is 1400 rpm before settling to 800 rpm after 20 secs.does any one know if this is a symptom of an air leak and if so where could such a leak be?best regards richard

[lancialulu]

sounds like it could be a manifold leak. Have you ever taken these apart? I found the the best way to ensure these dont leak is (even using new gaskets) to use a copper loaded silicone sealant (just a smear as you dont want the venturi having a ridge of sealant). It could also be worn spindles causing the butterflys not to close properly and then the find their stop position. A second throttle spring may assist.

Tim

[Richard Fridd]

part of the problem is slightly clearer.the idle speed is altering depending on whether the clutch is depressed when the car is stationary[ie clutch dragging when in neutral]there is a further intermittent problem re clutch-occasionally if i select 1st gear for example i cannot get back into neutral unless i turn the engine off first.this has only happened so far with a cold engine/box.will the cluch fail soon can anyone tell me?best regards richard

[lancialulu]

Could also be gearbox oil issue??

Tim

[Richard Fridd]

oil level correct.richard

[rogerelias]

Check for thrust washer movement, ie, crank moving back and forth.when crank pulled and pushed,

[fay66]

Check for thrust washer movement, ie, crank moving back and forth.when crank pulled and pushed,

With the engine running get someone to operate the clutch while you watch the crankshaft pully for any movement forwards and backwards, Vauxhall 3 bearing cranks with thrust washers either side of the centre bearing only were very prone to this.

Brian
8227

[Richard Fridd]

no visible movement when operating clutch with engine running,so with engine not running i have applied pressure with a lever to the front crankshaft pulley[pushing the pulley rearwards]and with an assistant depressing the clutch pedal[pushing against my lever pressure]detected very slight movement- maybe 0.25 mm and difficult to measure.is this acceptable?manual says crankshaft end play is 0.052-0.255mm.best regards richard