[WRL_E90]

I completed the 3 stage manifold swap today and the car feels great but when the I hooked up the MAF sensor it had a really rough idle but when the MAF is disconnected it drives just fine and I can actually tell a slight power gain even pre tuning. If anyone else has had this problem please let me know. I had a few codes all relating to the MAF I don't have them on hand I can run diagnostic if that helps but as stated disconnecting the sensor fixed the problem.

[W37V]

start by cleaning your maf. Use the whole can if you need to. Flip it upside down and let it soak in maf cleaner (fill the little white plastic).

If that doesn't work, you have few options. Get a new one- used (from car-part. com) or get a new one - new.

[WRL_E90]

Originally Posted by W37V

start by cleaning your maf. Use the whole can if you need to. Flip it upside down and let it soak in maf cleaner (fill the little white plastic).

If that doesn't work, you have few options. Get a new one- used (from car-part. com) or get a new one - new.

Yeah I'm definitely going to try to clean it first. I was mostly just wondering if it could be related to the swap. Maybe something I did wrong. I followed the z4 guide. Of course it's possible and probably likely it got something on it while the intake was out of the car for the surgery. Hopefully that is it.

[W37V]

Originally Posted by WRL_E90

Yeah I'm definitely going to try to clean it first. I was mostly just wondering if it could be related to the swap. Maybe something I did wrong. I followed the z4 guide. Of course it's possible and probably likely it got something on it while the intake was out of the car for the surgery. Hopefully that is it.

Did you remove your charcoal filter and maybe put in K&N? If so, that is probably what is causing your MAF issues.

And no, no other things should affect the maf other then maf itself. For example, you could Possibly have a bad connection, dirty maf, failing maf. Start by cleaning it throughly.

[WRL_E90]

Originally Posted by W37V

Did you remove your charcoal filter and maybe put in K&N? If so, that is probably what is causing your MAF issues.

And no, no other things should affect the maf other then maf itself. For example, you could Possibly have a bad connection, dirty maf, failing maf. Start by cleaning it throughly.

Will do! Thank you for the advice. I have removed the charcoal filter and put in a K&N but have been running as such for 10k miles maybe more.

[claasmi]

You probably have a vacuum leak causing un-metered air to get in after the MAF. I experienced the same thing after installing the 3 stage IM myself. Car ran like complete shit with MAF connected but ran fine when unplugged. I had forgotten to plug one of the hoses into the intake manifold. I would really check all your hoses.

[WRL_E90]

Originally Posted by claasmi

You probably have a vacuum leak causing un-metered air to get in after the MAF. I experienced the same thing after installing the 3 stage IM myself. Car ran like complete shit with MAF connected but ran fine when unplugged. I had forgotten to plug one of the hoses into the intake manifold. I would really check all your hoses.

I didn't replace my crankcase vent hose do you think it is possible I broke it somewhere I have read that they are very fragile. It didn't seem to be broken anywhere. I did plug the extra hose and sealed it with appoxy.

[hassmaschine]

Originally Posted by W37V

Did you remove your charcoal filter and maybe put in K&N? If so, that is probably what is causing your MAF issues.

And no, no other things should affect the maf other then maf itself. For example, you could Possibly have a bad connection, dirty maf, failing maf. Start by cleaning it throughly.

Sorry but no. Can the K&N kills MAFs just die already? I run them on every car I own and have never had a problem in tens of thousands of miles.

Most likely the connection is bad or theres a vacuum leak. I'd put money on a vac leak. Did you replace the breather hoses? They are made of shitty plastic - even if you think you didn't break them, you did and its causing a vac leak.

[claasmi]

Originally Posted by WRL_E90

I didn't replace my crankcase vent hose do you think it is possible I broke it somewhere I have read that they are very fragile. It didn't seem to be broken anywhere. I did plug the extra hose and sealed it with appoxy.

Certainly possible. I would first take the manifold off just enough to be able feel and check all the connections of the hoses to the manifold. Its easy to think it's connected but for it not be fully 'clicked in'. They will only connect properly when oriented the right way. Also check the intake boot to throttle body connection. I didn't replace my vent hose either and even bent it pretty hard getting things back in but it was fine.

[E86Z]

I hear you, im running a k&n oiled too. The issue is over oiling can lead to soiling the maf. I currently have a rough idle, I'm going to try to diagnose it with a maf from a car running an OEM filter

[WRL_E90]

I think I found the problem the vacuum line behind the throttle body has a broken clip and probably isn't sealing properly causing this to happen I do not know how to go about fixing this. Also I don't know how to test this because I need the throttle body off for access to it. I might just ask the tuning shop to deal with it for me.

[rick100]

tie wrap !

[W37V]

Originally Posted by hassmaschine

Sorry but no. Can the K&N kills MAFs just die already? I run them on every car I own and have never had a problem in tens of thousands of miles.

Most likely the connection is bad or theres a vacuum leak. I'd put money on a vac leak. Did you replace the breather hoses? They are made of shitty plastic - even if you think you didn't break them, you did and its causing a vac leak.

I will continue saying this until there is proof that it doesn't affect it. By proof I mean: take the MAF and soak it in k&n oil. Also add some carbon dust. Then run the MAF and see if it has issues. If no issues, I'll gladly apologize and concede. Until then, I firmly believe that over oiled k&n can cause issues with MAF. Also, I believe that carbon dust (from removing charcoal filter) combined with oil will def coat your MAF and cause it to have issue.


Prove me wrong.

[hassmaschine]

OK - I cut out the carbon filters of both the N52s and ran K&N filters. No issues. Just how do you "over oil" these things anyway?

[rick100]

Originally Posted by W37V

I will continue saying this until there is proof that it doesn't affect it. By proof I mean: take the MAF and soak it in k&n oil. Also add some carbon dust. Then run the MAF and see if it has issues. If no issues, I'll gladly apologize and concede. Until then, I firmly believe that over oiled k&n can cause issues with MAF. Also, I believe that carbon dust (from removing charcoal filter) combined with oil will def coat your MAF and cause it to have issue.


Prove me wrong.

I've been running with charcoal filter removed and k and n filter (inside the stock air box , with bottom of the air box cut off) for over a year now , zero problems , idles perfect .

I've had it previously on my modded civic for over 4 years and never once had an issue with erratic idle.

I did have an idle problem on my mazda 3 after replacing the air filter, but that one was 100 % stock , it turned out that I forgot to re attach once of the hoses that had come loose

[W37V]

Originally Posted by hassmaschine

OK - I cut out the carbon filters of both the N52s and ran K&N filters. No issues. Just how do you "over oil" these things anyway?

Ask K&N. mine was soaked. I actually had puddles of oil in my air box. Yes the filtered was new from the store.

[WRL_E90]

Guys the gasket on cylinder 5 had come off somewhere during the install. That was the cause of the leak. I feel really stupid. Car is fixed and will be tuned by BPC next Thursday.