i get a bit of a flat spot around these revs in 2nd n 3rd
on a 1.8 coupe 02 plate (not sure what engine code as i get confused with all the x220clet etc etc lol)
im always looking at the road when i put my foot down...not at the rev-meter
...personally i think the 1.8 revs quite smoothly in standard form...if your having problems perhaps a remap is on the cards? have you derestricted/veccy C'd your intake?
do a search for veccy c - or look in the how to's in the tech section - all the info is there regarding the upgrade. How about giving the throttle body a good clean. Obviously I guess yours is the Z18XE therefore it doesnt have an ICV or an EGR so u can only clean the T/B and hope for the best!
This reply is probs way off - but just a suggestion - I'd defo give the TB a clean (with carb cleaner or similar) before going down the route mentioned above.
ahhh...i forgot to mention i'm a cyclopseOriginally Posted by jaymes
t'is worth derestricting the airbox and adding a veccy C pipe either way...will improve throttle response and maybe smooth some of your flat spots...have a look in the s in the technical section
undoing a few clips...yanking out the airbox...opening it up...swapping to a k&n panel filter in the process...then take out the 2 "restrictive tubes" inside the box...these reduce airflow...and put it all back together again
An '02 Astra 1.8 has the Z18XE engine. Both this engine and it's predecessor X18XE1 are fitted with "variable intake manifold" which makes the intake longer up to 3.5/4.0 and shorter above 3.5/4.0. It's operated by a set of flaps these might be sticking.
A fault on these flaps will eventually show up a diagnostic code but it may not be severe enough for that.
Run the engine with the ducting removed from the throttle body and gently spray carb cleaner in. This'll help to remove any oily / carbon deposits in the intake tract. Be patient, spraying too much just cause the engine to stall.
Maintains:- Vectra Design 1.9CDTi
Drives :- Hyundai Santa Fe
mine used to have that, viper and jetex cat back exhaust sorted it out though..