[thatllbe2000bucks]

I cleaned my intake valves 3 days ago and decided that today was the day that I finally start it. I press the start button and engine starts stuttering like crazy and after like 4-5 seconds finally starts, but the idle is crazy. Rpms are going up and down from 600-1000. Didn’t hear anything bad like detonation or metallic clunks, but I decided to stop the engine after a few seconds as I got pretty scared.

I changed my coils, spark plugs, valve cover gasket, oil, ofhg, coolant, upgraded my charge pipe. All vacuum lines, sensors and bolts were connected back and torqued to spec. For the intake cleaning I used carb cleaner and some brake cleaner in the end. I am sure some carbon ended up in the cylinders, but I did crank my engine over for like 10 seconds with spark plugs out to blow out any debris that accumulated inside. The question is this normal and will the idle calm down or I am toast?

[Bimmer_Bro]

Originally Posted by thatllbe2000bucks

I cleaned my intake valves 3 days ago and decided that today was the day that I finally start it. I press the start button and engine starts stuttering like crazy and after like 4-5 seconds finally starts, but the idle is crazy. Rpms are going up and down from 600-1000. Didn’t hear anything bad like detonation or metallic clunks, but I decided to stop the engine after a few seconds as I got pretty scared.

I changed my coils, spark plugs, valve cover gasket, oil, ofhg, coolant, upgraded my charge pipe. All vacuum lines, sensors and bolts were connected back and torqued to spec. For the intake cleaning I used carb cleaner and some brake cleaner in the end. I am sure some carbon ended up in the cylinders, but I did crank my engine over for like 10 seconds with spark plugs out to blow out any debris that accumulated inside. The question is this normal and will the idle calm down or I am fked?

Sounds like a very big vacuum leak.

[E90lmao]

Check the vacuum connection on the side of the throttle body, make sure that connection is solid. Could be a leak from that, definitely sounds like a vacuum leak to me.

[thatllbe2000bucks]

Will do that first thing in the morning. It actually could be a vacuum leak as I did drill into the intake manifold to install 1/4” line for the bov. What about the carbon deposits that probably got into the cylinders? Will they just burn off and not cause issues?

[Cloverdale]

Originally Posted by thatllbe2000bucks

I cleaned my intake valves 3 days ago and decided that today was the day that I finally start it. I press the start button and engine starts stuttering like crazy and after like 4-5 seconds finally starts, but the idle is crazy. Rpms are going up and down from 600-1000. Didn’t hear anything bad like detonation or metallic clunks, but I decided to stop the engine after a few seconds as I got pretty scared.

I changed my coils, spark plugs, valve cover gasket, oil, ofhg, coolant, upgraded my charge pipe. All vacuum lines, sensors and bolts were connected back and torqued to spec. For the intake cleaning I used carb cleaner and some brake cleaner in the end. I am sure some carbon ended up in the cylinders, but I did crank my engine over for like 10 seconds with spark plugs out to blow out any debris that accumulated inside. The question is this normal and will the idle calm down or I am fked?

Don't panic yet! Unless you've left the electrical connection to the throttle body disconnected (I did after cleaning my intake) you may just need to re-set adaptions/adaptations. With fully charged battery Do Not start vehicle but turn ignition Fully ON, hold gas pedal down full for 30 seconds then turn ignition OFF, release pedal, wait a minute and start vehicle.

[Tyc0]

Sounds like you forgot to reconnect something. I wouldn't worry, go back and recheck all connections/wires. Unless you didn't properly close the valves while cleaning there should be no carbon deposits that made their way into the cylinders.

[TheMidnightNarwhal]

Ok first of all, from your post it seems you only tried to run it for like 5 seconds. Start the car again and wait and see if the idles idles out, like wait a good 2 minutes at least.

Also, any codes? If there is no codes I would reset adaptations and see what happens if it still happens after letting it idle.

And yeah, even if carbon deposits fall into cylinder I doubt it's gonna damage anything.

[thatllbe2000bucks]

Thank you guys for helping me out. It seems like the problem wasn’t that big of a deal it’s more that I got scared that something went wrong. What happened was my tial bov nipple that I tapped in the intake manifold popped off. I cleaned it and applied epoxy again. It seems to hold for now. What’s funny is that I didn’t get any codes (broken sensor??) except a misfire code in cylinder 6 which hasn’t come back. It’s probably due to some carbon sludge entering the cylinder. I’ll try to wot and see if I get any misfires or vacuum leaks from the bov nipple.

[BSM n54iS]

Originally Posted by thatllbe2000bucks

Thank you guys for helping me out. It seems like the problem wasn’t that big of a deal it’s more that I got scared that something went wrong. What happened was my tial bov nipple that I tapped in the intake manifold popped off. I cleaned it and applied epoxy again. It seems to hold for now. What’s funny is that I didn’t get any codes (broken sensor??) except a misfire code in cylinder 6 which hasn’t come back. It’s probably due to some carbon sludge entering the cylinder. I’ll try to wot and see if I get any misfires or vacuum leaks from the bov nipple.

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