[naylee]

car's max speed 80, if i go beyond, it will cut off when slowing down.

i changed the coil pack, belts, timing section, and cleaned the injectors.

problems still occurring

please help me fix this problem

[Leeky]

Are you saying your car is physically unable to break 80mph?

What engine is it?
How is the fuel.consumption?
Do you have engine management light on?

We need as much information as possible to help diagnose the problem. Did you do anything before it started, has it been sat, why were the parts you mentioned above changed?

[naylee]

needed to change those parts as they were due to be changed.
my engine is the z16xe 1.6 petrol opel vectra b
fuel consumption is normal.
the management came on and came off some time back.
when the problem started - my brother used my car and felt is was a racing car - mash down hard, high revs.
when i got it back, the rpm went up to 3000 rpms, then came back down, then cut off, retarted, did the same then settled back down, since that time, i am unable to break the 80 kmph. if i do, i will get the necessary speed, but the engine seems llike it is gasping for air or bucking , then when i slow down after breaking that 80 barrier, the car would cut off.
after changing those parts the car would start easier, without having to tumble it many times.

i would like to break than 80kmph barrier with out having to worry that the car would buck and later cut off.

thanking you very much in advance
Leeky

[Leeky]

It might be the idle control valve playing up.

Does it idle ok, or does it appear like its revving up and down when at idle?

If you dip the clutch when moving does the engine stall?

[naylee]

sorry, it is an automatic
however, before i changed the parts it rev'ed up and down when at idle
esp when the engine was cold, or after it cut off before the parts were changed.

[Leeky]

Does it still stall when you back off the accelerator pedal and revs drop to idle?

[naylee]

as the parts have changed, the idle is normalized,
however, when i past 80 kmph the car gets like it is struggling for air and starts to buck
then in slowing down it will cut off.
if i back off the accelerator pedal, it will start the cutting off phase, the revs will go up and down.
e.g at 80 kmph, there will be an average of 2000 revs. so when i back off when i go over 80
the revs will be max 2000 and fluctuate up and down to this max and then cut off totally at stop.

[Leeky]

Its the idle control valve.

When its faulty, it will cause the engine to pace up and down if its not under load, and it will cause the idle to do the same, or even stall.

It needs cleaning, or replacing.

[naylee]

thank you very much
will get it checked out and tell you what happened

[Leeky]

The lack of speed might be something else though, the idle control is most likely your cause of stalling and power idle control.

Out of curiousity, Is your engine hitting max revs at 80mph? If not, wat are the revs at that speed?