My ZX is running much better after changing the maf and two o2 sensors. The only problem is when I step on it, around 4000rpm it will drop right down as if there is no gas. I then depress the pedal and she drives fine, as if I am driving a manual car. The engineer could not find a fault when he connected the ZX to his diagnostics device. He said maybe the spark plugs need changing.

 

Any ideas?

Not revving past 4k revs sounds just like MAF, i know you have changed it recently, did you get a new one or second hand one? also, is it plugged in? though would of thought it might be a bit rough

Mine ran OK with the the maf unplugged when I took it over to Zedworld,

Could not go past 2,500rpm though.

I have a new one fitted, starts and drives like a dream but just cuts out around 4000rpm. It's not an original one, aftermarket maf. Do you think this is why it is cutting out? I was told to tune the engine once the maf was installed. What part and how will it be tuned?

Update for the rpm symptoms.

 

The revs will go all the way now but when I reach full boost the throttle cuts off and then I need to move my foot of the pedal and depress to accelerate. The problem started to happen after my car come out of the garage. I had two 02 sensors and a maf fitted.

 

Any ideas?

Sounds like you are experiencing boost leak at high pressure.

If the afm is a non genuine one like the ones on Ebay for £60 to £70 ( Below) then that is a very likely suspect, the non genuine one`s are notorious for poor running, cannot see how or why these companies exist selling naff stuff?

 

Jeff TT

 

 

Item number: 330657944477 £49.99 free p/p ???? too cheap!! blatant copy ( bad one too)

 

Edited July 9, 201213 yr by JeffTT