HI folks, I hope someone can id this fault for me, as its getting to be a pain in the neck...

When starting engine up or moving away from juctions/lights the sei tends to be very slow and lacking power. The car struggles to go (It feels if 1/2 of the engine is working). As this happens I tend to pump the gas as i need the power, and all of a sudden the engine over rev bloody quick! - this fault doesn't happen all of the time.

What is causing this? Is it the Lamber Sensor or something else.

Note - fuel injection light does not light up. So fuel injection is okay.

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Cadamuro Rear Spoiler
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Scrapped 1.2 Punto

Could be map sensor rather than lambda. Both are to do with the injection but, in general, the lambda problem makes its self known once the revs are up a bit. Check the pipe leading to the map sensor, remove it and give it a good blow out.

Also make sure that the plug leads are OK. I recently found a corroded plug top had caused the connector to erode away insde the insulation. Pull each lead off in turn and have a look at both the plug top and the state of the inside of the lead.

Cheers

D

At a guess, I'd imagine that a cylinder 'dies'. There could be a few reasons for this, maybe the spark isn't getting there (plugs and leads)?

Yes Duckling, it does feel if the cylinder does die, and the over revs due to extra fuel in the system.

Will look at the sparks tomorrow, is there a way of testing the sparks without running the engine?

I've heard about map sensor on honestjohn forums, I gonna ask a very stupid question, where is it on a 899cc engine?

Shopping List:

-40mm Lowing Springs
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Scrapped 1.2 Punto

Next to the passenger side suspension top strut. it's upside down and has a very thin pipe running from it to the engine



There's a certain satisfaction you get from driving over a Sleeping Policeman

excellent, I will have a bucter with the pipes...

Shopping List:

-40mm Lowing Springs
Cadamuro Rear Spoiler
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Scrapped 1.2 Punto

Well, had a look at the pipe work from the box of tricks to the engine. This pipe is connected to a white/black module which says dis carb on it. Anyways pipe has 2 splits - 1 near the sensor and 1 on another bend. A bit of tape to cure the problem for now i guess.

Shopping List:

-40mm Lowing Springs
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Window Tints
Scrapped 1.2 Punto

hiya people i have the same problem but ive got they 1.1s mk2 the onlt thing i have done to the engine is to put ngk plugs on it as a fiat garage sed i had bosch ones on and they were rubbish i dont think they where those sprint ones will these plugs cause the problem or is it the same as above if so where is it on the 1.1s mk2

chackney

Silver Sei, check the pipe from the map sensor on the right that comes from the Dist Carb. This has now cured my problem as the pipe had 2 holes in it and was leaking air out. I just need to get a replacment from the scrappy as I am not going to pay £14 for a rubber pipe!

Note, mine is also near its 36k service.

Shopping List:

-40mm Lowing Springs
Cadamuro Rear Spoiler
Window Tints
Scrapped 1.2 Punto