Reving poorly

[Virtual_Unknown]

my cars decided she wants to start playing up -
everytime i start the car it revs upto 2000 revs, sits there for a second and then literally bounces from 800 to 1200 revs until i touch the acelorator pedal - also when i do rev the engine, it revs up to around 2000 revs and will sit there for a few seconds before very slowly slowly coming back down - and most the time when shes idleing she sits at 700rpm

anyone any ideas? new plugs and leads? oil change? resetting the ecu?

 

[Virtual_Unknown]

20 veiws, no suggestions?

 

[BenR]

car?

 

[Virtual_Unknown]

erm.... ....yeah, it is a car suprisingly, seeing as were on a car website... lol

 

[RobFenn]

What type of car you mug!

 

[Soneji]

What bloody car he means! Itll be slow lambda / dirty icv....

 

[Virtual_Unknown]

lol - 1.4 sport - 97

 

[BenR]

tish.

Stepper motor and potentiometer.

Or does it only happen when cold/hot?

Might be the speed sensor behind the dash.

 

[Virtual_Unknown]

mainly does it when cold but occasionaly does it when warm aswell

 

[JAY172]

1.4 8V OR 16V?

 

[Virtual_Unknown]

1.4 8v chap

 

[Virtual_Unknown]

having had a quick look over my car it looks as though my cat or the centre pipe of my exhaust may be fooked - could this be the cause?

J

 

[JAY172]

poss the idle stepper moter.

 

[Virtual_Unknown]

it started to get a bit worse now and when im driving in low revs its started to kangaroo until i reach high revs.......arrrrrgggghhh

 

[BenR]

stepper motor, potentiometer, speedo sensor

 

[JAY172]

poss map sensor or the rubber pipe to the map sensor(commen for splitting)

 

[Virtual_Unknown]

cheers guys - ill get it checked out this week - so it likely to be something as simple as new plugs or leads?

 

[BenR]

not likely.

 

[JAY172]

Quote: Originally posted by Rallye-Joe on 14 March 2004

cheers guys - ill get it checked out this week - so it likely to be something as simple as new plugs or leads?

doubt it

 

[Virtual_Unknown]

having had a quick look over my car it looks as though my cat or the centre pipe of my exhaust may be fooked - could this be the cause?

 

[Virtual_Unknown]

anyone?

 

[BenR]

again, not really unless the lambda was affected.

 

[Virtual_Unknown]

how is the lamba connected with the exhaust? and where is it located?

Cheers

J

 

[BenR]

its in the downpipe or exhaust manifold depending on the RT model.

It reads the a/f ratio of the exhaust and corrects the engines running accordingly. If its broke and not feeding the engine info voltage then it coupd possibly be part of a problem.

 

[JAY172]

the only way a cat could affect performance is if it is starting to collaspe internally.the particles can bung up the cat/exhaust.if you bang the cat(when cold of course) with your hand does it rattle?