Flat Spot Pt2, Lazy Reving 1.9

[floodys 4 1 Cars]

i have another thread on here about my lazy revving 1.9 205 8v, it basically has a flat spot too around 3-4km just to refresh i have changed

 

ECU

AFM's

leads, cap, rotor

ig amp

cleaned up injectors (soaked overnight in carb cleaner)

coil

ECU temp sender

etc,

 

we (essex lot, silky, boobies etc) had a fiddle with it over the weekend and it cough's/flat spots at around 3-4k, on the way over to boobies after weekend we richened the cr up a lot from 2% co, to around 6.5% co, this seems to make it better, crazy thing is that, the plugs dont get coked up, it do's smell of petrol, and dosnt seem to "drink" juice!! so, do i leave it like it and run it and adjust co for MOT when due or anyone out there have a idea why she will run "nice" when rich.!!

Now one last thing i have a gunson co meter and i/we (boobies) think its right because we connected it up to his car and it read spot on!!

 

help please guys and girls

[j_turnell 137 3 Cars]

Tried a different distributer? also dizzy fly lead?

[floodys 4 1 Cars]

sorry!!! yeah, tried a different dizzy with a different fly lead!! cheers

[Mikey S 29 1 Cars]

i would check that the advance weights inside the distributor body itself are free and actually advancing when the engine is revved. if these are seized, it can make them really lazy to rev.

[j_turnell 137 3 Cars]

You checked your compression? Changed fuel filter?

[floodys 4 1 Cars]

good comp over all cylinders, fuel filter changed 2 week ago.

dizzy weights a poss, but same syptoms with 2 different dizzys, 1 of which was on a good running 1.9!!

next please.....

[j_turnell 137 3 Cars]

Whats the condition of your oil like? Does it pull clean after 4k?

[floodys 4 1 Cars]

oil/service done not long ago, cant tell you what its like exactlay as not with car now, do's pull well when its "cleared" its throat!! around 4k and up!!

[dcc 855]

Is it choking at idle or under load? does it get worse under load?

 

Have you possibly timed up the engine wrong? Checked ignition timing?

[floodys 4 1 Cars]

under load and the timing was checked and checked again at the weekend and its spot on!!! doh!!

[dcc 855]

maybe head gasket?

[DamirGTI 342]

Carb cleaner won't do for cleaning injectors as it can't break scale sediment which forms inside the injectors , get them cleaned on the ultrasonic machine and test them afterwards for spray pattern and flow (ideally all 4 injectors need to fill the same cc value when testing them for flow after cleaning , although +-5 % difference is acceptable) ...

 

Damir

[floodys 4 1 Cars]

did think h/g but got really good comp over the 4 cylinders, unless under load i'm getting a leak?

re,, injectors, i tried another set in it tonight and same problem....