Beretta.net

hi
the engine stutters sometimes when idling. only after some minutes driving. what could be the problem?
thanks!

TCC. Unplug it.
Square plug on the trans right about below the air box.

thanks eric!
this one? I managed to tilt it up, but the plug is still stucked in the trans how can I unplug it without to break it?

There is a clip on it.
I forget but just release the little lever thingy and it will pull off.

yeah one clip I already released. is there a second one?

May be two sided. I forget, sorry.
Or just cut the damn thing, Pain in the ass as it is!!

its hard to tell but it could be as simple as a dirty throttle body the tcc is normally a problem when slowing down from higher speed the car will just completely stall.

Thank you guys I will check both things and report later.

eric I unplugged the tcc. the engine is still vibrating when idling @700 RPM and its getting stronger. maybe a kind of vacuum problem?
my mechanic said that there could also be a problem with the compression.
what should I do next?

If u have oily spark plugs then I think you have your answer.

before wasting any time on doing anything else, do a compression test. I have had a stumble in my idle and i replaced everything looking for it. Now its going to the dealer and i fear it will need some major work. Better to get the test done now before doing like i did and replacing the plugs, wires, icm, iac, vacuum harness, coilpacks, CPS, CTS, O2, ECU, injectors for no reason. it could be as simple as a burnt valve

for a compression test I should take out all 6 injectors and spark plugs and put measurement instruments in. right?

Correct. Please post the numbers that you find.

Berry wrote:for a compression test I should take out all 6 injectors and spark plugs and put measurement instruments in. right?

You do not have to remove the injectors.
Only remove all 6 spark plugs,
Find a way to block the trottle body wide open
Unhook the wires plugs going to the icm
Kill the fuel pump
Hook a compression gauge and crank until needle on gauge stops (or when you hear the engine turn 4-5 times)
Do on each cylinder and write down the numbers.

alright I did the test.
I made it in a DIY-garage
and I only removed the spark plugs
nothing else. then I put a compression
gauge into the holes one after another.
from passengerside rear to driverside front
cyl 1 has 8 bar
cyl 3 has 7 bar
cyl 5 has 8 bar (the one with the oily spark plug)
cyl 2 has 9 bar
cyl 4 has 8.5 bar
cyl 6 has 9 bar
so nothing special.

other things I've done:
I opened the egr. it was already very clean!
throttle body still clean. intake has only
little bit oil.

tcc unplugging I mentioned before
didnt change anything at all.

I changed the oil a week ago. it was
after a year black like coffee.

I sprayed the whole engine. no leaks!

and: I cleaned the pvc valve.
it rattles when I shaked it. seems to be ok.

my retta has still rough idle more and more. it shakes
every three or five seconds in N. it shakes also when I brake sometimes in D or R.

what could be else the problem? ignition
electronics (too high resistance?) or some exhaust issues? ecm failure?
problems with the clutch of the auto?
blown head gasket?
maybe I should check the errorcodes. I have OBD1 and
no idea how to do this...not yet

any suggestions?