engine stuttering

berry · Post by **berry** » Wed Mar 06, 2013 7:05 pm

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

Asylum · Post by **Asylum** » Wed Mar 06, 2013 8:44 pm

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

berry · Post by **berry** » Fri Mar 08, 2013 5:31 pm

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?

Asylum · Post by **Asylum** » Fri Mar 08, 2013 6:37 pm

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

berry · Post by **berry** » Fri Mar 08, 2013 6:45 pm

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

Asylum · Post by **Asylum** » Fri Mar 08, 2013 6:49 pm

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

themixer · Post by **themixer** » Fri Mar 08, 2013 8:41 pm

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.

berry · Post by **berry** » Sat Mar 09, 2013 6:12 am

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

berry · Post by **berry** » Tue May 14, 2013 2:51 pm

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?

Ozzwoman9 · Post by **Ozzwoman9** » Tue May 14, 2013 4:27 pm

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

themixer · Post by **themixer** » Tue May 14, 2013 5:20 pm

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

berry · Post by **berry** » Tue May 14, 2013 5:26 pm

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

Money pit Beretta · Post by **Money pit Beretta** » Tue May 14, 2013 6:12 pm

Correct. Please post the numbers that you find.

93 3.1L · Post by **93 3.1L** » Tue May 14, 2013 8:55 pm

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.

berry · Post by **berry** » Wed May 15, 2013 6:00 pm

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?

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