vw sharan wont rev past 4000

[playboy1978]

hi i have a 1996 vw sharan 2.0 petrol
ive fitted new full exhaust
replaced head gasket
new sparks dizzy cap rotary arm leads
petrol filter
new air box
new maf sensor
new throttle body
none of this seem to fix the problem

on idle its fine it drives fine when you floor it it pulls but only to 4000 revs andd wont go past it same thing in neutral and all gears so the car only goes 90mph thought it could be ecu but dont know


p.s does anyone know where the ecu is (been told front right under bonnet in black box and under scuttle panel in middle ) both wrong

[Mr2Mike]

Is the MIL illuminated? And if not, does it correctly illuminate and then out go when you switch the ignition on?

This sounds like the ECU is in the "limp home" state, so getting the diagnostic codes read would be the first thing to do before spending more money on random parts. The hall sensor within the distributor is a common fault that causes these symptoms.

Edited by Mr2Mike on Sunday 13th June 13:02

[playboy1978]

thankyou for the reply if the mil sensor is the engine light on dash then it comes on and goes off when i start the car is the sensor changeable in the dizzy or do you have replce the whole unit

[Athlon]

Blocked/collapsed cat.

[playboy1978]

Athlon said:

Blocked/collapsed cat.

thanks for reply but i have put a new exhaust from manifold to back on it
maybe the cat was faulty how do i check it

[playboy1978]

hi i have done a diagnostic on the car and shows the cam position sensor is sending faulty signal can this cause the problem of revs thanks

Edited by playboy1978 on Thursday 17th June 08:45

[Mr2Mike]

The cam position sensor is the "hall" sensor I mentioned in my post. Failure of this will put the ECU into a "limp home" state which will limit maximum RPM.

[playboy1978]

sorry mate but thanks for the reply went bought new one and its the wrong one lol best bit mine dont have a part number on so dont know what to do now the one they sold me had a ring seal mine dont car dont start with it i guess im f**ked tried a couple of car shops all giving me same part saying its right but the thing dont fit properly any ideas thanks oh and vw dealers well to exspensive lol

[playboy1978]

sorry mate but thanks for the reply went bought new one and its the wrong one lol best bit mine dont have a part number on so dont know what to do now the one they sold me had a ring seal mine dont car dont start with it i guess im f**ked tried a couple of car shops all giving me same part saying its right but the thing dont fit properly any ideas thanks oh and vw dealers well to exspensive lol