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Author Topic: Z22XE hesitates at full throttle  (Read 274 times)

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Opelduude

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Z22XE hesitates at full throttle
« on: 07 July 2019, 20:03:10 »

I have ignored this for a long time but its soon 3 weeks of vacation and time to give some love to the car.
Some days the car hesitates at full throttle and the next day it's all fine. Very annoying because i'm towing a trailer a lot during the summer and need all the power it should have.

No fault codes. I have limited access to live data. I suspect that the o2 sensors are becoming slow to regulate. There is also no difference when i unplug the maf. No engine light and it still runs smooth at idle.

The coil and spark plugs where new last autumn and the valve cover gasket this spring. No oil on the plugs when i checked today. Cleaned the throttle body a couple of months ago too.  Fuel filter and fuel pump was replaced just before i bought it.
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Doctor Gollum

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Re: Z22XE hesitates at full throttle
« Reply #1 on: 07 July 2019, 20:30:50 »

Sounds like a sticky throttle plate, but... When was the fuel filter last changed?

Also the thinner of the two breather hoses turns to a gooey mess. If it has the consistency of blutac, then change it and report back  :y
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Opelduude

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Re: Z22XE hesitates at full throttle
« Reply #2 on: 07 July 2019, 21:04:49 »

The two breather hoses are new because the previous owner could not figure out why the car was erratic. I replaced the coil right after i bought it and solved it. As mentioned he also replaced the fuel pump and the filter right before i bought it.
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Doctor Gollum

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Re: Z22XE hesitates at full throttle
« Reply #3 on: 07 July 2019, 21:10:44 »

The two breather hoses are new because the previous owner could not figure out why the car was erratic. I replaced the coil right after i bought it and solved it. As mentioned he also replaced the fuel pump and the filter right before i bought it.
Have you personally checked?
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Opelduude

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Re: Z22XE hesitates at full throttle
« Reply #4 on: 09 July 2019, 19:28:52 »

Yes i have checked both again now. They are not clogged.
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Opelduude

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Re: Z22XE hesitates at full throttle
« Reply #5 on: 28 July 2019, 12:18:18 »

I tried to replace the maf just for the sake of trying something not so expensive.
No difference at all. I'm beginning to suspect that the throttle body are not working right. When it's cold it sticks at 1500 rpm which i guess is normal when the engine is cold. This "cold start" function lasts much shorter during the hot time of the year.
Since the car runs smoothly and there is no sign of jerking or jumping at full throttle if you understand. It seems like the car only thinks i'm only doing half throttle.  Throttle body costs 350 pounds with discount so i don't want to buy that just to try it.
In case does the new one have to be programmed or adapted to the car?
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Doctor Gollum

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Re: Z22XE hesitates at full throttle
« Reply #6 on: 28 July 2019, 15:37:36 »

Nah, simply bolt it on, plug it in and fire it up  :y
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