Technical Engine hissing and miss firing

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Technical Engine hissing and miss firing

la16284

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Jun 5, 2004
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nottingham, United Kingdom.
iv got a punto sporting 90 noting but trouble [V] but anyway.

When i rev the car up to 3000rpm and release it theres like a back fire that sound like the old sports car do. Also when driving along as i accelerate theres like a hissing sound. Iv not got a clue what the problem is? I did think that the engin might be out of tune but, was told by a garage that puntos carn't come out of tune because the computer on boared doesn not let it? Any light on the situation woauld be appreciated.
 
check the induction trunking,the tubing from the air filter to throttle body for leaks,holes and loose connections.this would create a 'sucking' sound that would rise with the revs,is this the sound?if so your engine is getting more air than the ECU knows about causeing poor running.if not get back to us:)

A Dog Is Not Just For Christmas
Sliced Thinly It Can Last Till Easter
 
There are no holes in any of the pipes or hoses to be seen.
iv put new spark plugs in and new HT leads and the engin is still no change[V] mabe a sencor is broken? on the air in put?
 
Have you checked the gasket between the Inlet Manifold and the Cylinder head? If this is gone, it'll suck air there. How you check it, I'm not sure - get a friend to run the engine and stick you head under the bonnet for a look? (no long hair or dangling clothes and wear eye protectors!!!)

The back firing may or may not be related. I used to have a 1.4 Tipo (much the same engine, smaller pistons) and it would occasionally do the same - about 3000rpm, lift off and.... POP! It did infrequently and a mechanic friend reckoned it might be a sticking exhaust valve. It never got any worse and I just lived with it.

(Having said that, I wrote it off on Christmas Eve 1995, walked out the wreckage and already had a new Punto GT Turbo on order for delivery Jan 10th 1996! Talk about lucky! ;->)


Here come da judge...
 
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