Cleaned inlet manifold expansion chamber NOW CAR WONT RUN!

[shaggs69r]

Hi all i have just cleaned out the inlet manifold chamber on top of the motoe it is now clean but i believe i may have got gunk down into the inlets and now the car wont run whwnever i try the car coughs and splatters and sometimes backfires i`m a bit worried to try again as i`m worried about the damage backfires may cause
ANY IDEAS HOW TO GET IT TO RUN

i have tried to clean with a vac but no help any help would be great

thanks in advance
shaggs

[soop]

You haven't knocked a vacuum line off by chance?
Could be a coincidence also, you're ignition leads/plugs might be stuffed.

[Darren_L]

not sure what you mean by inlet manifold expansion chamber ?
I see that you have a VN & your g/f has a VT. I assume you are talking about the VT if you are referring to an expansion chamber ?
VT has the ecotec engine with the removeable top on the intake plenum

if so, make sure the rubber seal that seals top plate to the plenum is sealing correctly
also make sure all the connectors are back on, vacuum lines etc

[shaggs69r]

Sorry guys yes its the vt v6

so even with shit falling in it it while i cleaned it (i`m thinking maybe pieces are too big that may have fallen in pieces of carbon n black crap) it should run not mis n stall?? even in this case???
will trying to start it repeatedly while it misses and backfires slightly do it any damage as i`m hoping if i try to start for 10 mins or so with injector cleaner in it and a little spray or two of throttlebody cleaner may clear it out????but i dont wanna damage it
thanks again
shaggs

[Darren_L]

depends how big the carbon pieces were...
if they were fairly sizeable, a piece may have got stuck between an inlet valve and the seat, leaving the valve partially open when the valve closes. Which can result in a backfire/miss.
Check all the hoses, connections and make sure that plate is sealing. Failing that, I'd be trying some top end cleaner, to see if you can flush the carbon pieces out of the intake ports

[PanthaVS]

if i was running well before... then you have forgotten something... even small peices of carbon/crap falling down will do nothing dramatic... they will just get sucked in and blow out through the exhaust....

Like the guys say... check all vacuum hoses, think back to pulling it apart... what did you disconnect??? the idle air valve... did you touch the plug on that? the throttle body, did you unplug anything on that?

if you STILL cant find anything... do a diagnostic check on it... the computer will tell you a code, and from that, you can see where the problem is...

[shaggs69r]

nah man big pieces maybe even possibly as big as a 50 cent but not shure how big and or which ports it went down........or how much

so spraying a fair bit of throttle body cleaner down inlets then reseal quickly and try to fire maybe this will clean the crap out definatley did not disconnect anything and all seals are good but each time it back fires badly it pops off the vac hose or some hose that runs from a solonoid near the front firewall on drivers side it pops off right near the throttle body

shaggs

[Darren_L]

I've seen a piece of carbon wedged into a valve seat, preventing a valve from sealing. It had obviously been there for a long period of time as it had left a small depression in the valve seat and valve face. The valve seat had to be reground and the valve replaced

If an intake valve is sticking open or not sealing properly, it will cause a backfire through the intake.
Shaggs, I doubt carby cleaner is going to do anything to dislodge the carbon (if that is the problem)
See if you can find some 'top end cleaner' and run it through the intake - make sure it's EFI/O2 sensor friendly. Not sure who makes it now (maybe Wynns ?). I know Toyota used to sell some awesome top end cleaner. Not sure if they still do.

Lesson to be learnt here.... never let crap fall into your intake ports, stuff some rags into the openings should you decide to clean the intake again - just remember to pull the rags back out when finished!

[VT-565]

ha ha ha....I bet you're Mr Popular

[nemesis_adrasteia]

make sure you havent sprayed cleaning solvents on your idle air control valve, it can damage them.

[shaggs69r]

oh i just went hack with it
didnt think about efi or injectors but i done this with my vn no worries but i had to spay from the throttle body as u cannot separate that one hope i havent damaged the idler i did ruin this one before on my vn even using efi safe air flow meter sensor cleaner sorry for the spelling i`m not checking as i`m in a big hurry i`m trying to get the car running to go riding!!!!

[WogBoyz]

Maybe try some of the Subaru Engine cleaner stuff ive used it a few times, thats if carbon is the problem, what do u mean u cant separate that one from the throttle body?

[shaggs69r]

HA HA............. the secret is hold ya foot to the floor while trying to start, once revs make 3,500to 4,500 hold for 5 secs slowly decrease then the car will idle i was trying to get it to start pretty much by just turning the key once foot was held flat it started then blew it all out the back end!!!! gently releaed the pedal and all good as new thanks for ya help

shaggs