Correct injectors?

[Jaap]

so the injectors have been replaced by FIC injectors, oil pressure sensor as been changed and the CO meters have been replaced.

Now we have a new challenge the car runs only good above 4000 rpm when it gets under the 4000 rmp the car starts to shock in every gear when the pedal is put to the mettal.. and it`s way to slow.

Do you guys have any idea what it could be?

[XfireZ51]

Check the fuel pumps.

[Billy Mild]

Originally Posted by XfireZ51

Check the fuel pumps.

I have noticed my car doesnt run smooth under 2000 RPM or around that RPM. It feels almost like a misfire, but doesnt sound like it is misfiring. Kind of weird.

[XfireZ51]

Originally Posted by Billy Mild

I have noticed my car doesnt run smooth under 2000 RPM or around that RPM. It feels almost like a misfire, but doesnt sound like it is misfiring. Kind of weird.

Don't know enough about the car to comment.

[Jaap]

Originally Posted by XfireZ51

Check the fuel pumps.

Fuelpumps have been replaced fuel pressure is as it should be

[Jaap]

when i put te pedal down very slowly it runs reasonably but when i put the pedal down hard it shakes back and froward.

[Paul Workman]

I've been following along too. Please, let me ask: When did this "misfire" situation begin? Was the problem there before you replaced injectors and other parts, or is this a new development (symptom)?

It doesn't sound too serious (yet), but do you suspect it is something related to work you have done or maybe the parts that were installed?? (Sooner or later, we all run across a bad "new" part. In statistics analysis they call it "infant mortality" - the new period when most products fail, not related to wear.)

[Jaap]

Originally Posted by Paul Workman

I've been following along too. Please, let me ask: When did this "misfire" situation begin? Was the problem there before you replaced injectors and other parts, or is this a new development (symptom)?

It doesn't sound too serious (yet), but do you suspect it is something related to work you have done or maybe the parts that were installed?? (Sooner or later, we all run across a bad "new" part. In statistics analysis they call it "infant mortality" - the new period when most products fail, not related to wear.)

Hi Paul,

The "misfire"has been there since i bought the car back in november, the "engine service soon" light jumped on when i bought it and has been there eversince. My mechanic put it on the computer and it said that fuel pumps where bad.
So we changed the fuel pumps, when the Z was ready and it had it`s test drive all of a sudden de injectors failed (injectors 3 years old) so we changed the injectors.

Next thing we changed was a new pvs system, oils, fuel filter, oil filter, LF pipe injector hosing, battery, oil pressure gauge sensor, oil pressure indicator, oxigen sensors, new gaskets. cleaned the tank and fuel lines, replaced the fueltankgasket. etcetc.

When i bought the Z there was a constant white fog behind the car, that`s now gone so that means that the work done sofar is properly done. The mechanic is a very serious guy and im absolutly sure he didn`t make any mistakes.

Three years ago the engine has been rebuild with new crankshaftbearings, new pistonrings, ingnition coils and sparkplugs.

BTW, engine service light is gone

[XfireZ51]

Originally Posted by Jaap

when i put te pedal down very slowly it runs reasonably but when i put the pedal down hard it shakes back and froward.

Do you keep your foot down when this is happening or do you lift right away?
It could be the secondaries. Try keeping your foot in it for longer than 2 sec. and see if SES light comes on.

[Jaap]

Originally Posted by XfireZ51

Do you keep your foot down when this is happening or do you lift right away?
It could be the secondaries. Try keeping your foot in it for longer than 2 sec. and see if SES light comes on.

I keep my foot down, SES light didn`t come on.