I need HELP!!! Civic EG/ESi - High Lambda rating at idle

[simba1]

Hi dear Honda fellows!

Sorry that my Swedish is not of a very good level to write here so I'll share my problem in English.

I went through besiktning yesterday and had a high lambda rating on idle/tomgång... 1.31 (1.03) I noted before that the RPM jumps little higher than normal sometimes when driving... and then goes normal again... I have a 3 inch Jap/sport exhaust... and a Simota cold air intake system (shielded from engine heat)... All the filters are new as well as new oil... I cleaned the throttle body with a MAP sensor cleaner...

Has any of you had the same problem? As I understand correctly... my car is taking low fuel and more air mixtures to give a rating that high. How to get it to normal and clear bilprovning.

Your urgent help will be much appreciated

Thanks and cheers!

Ethan
0704863580

[fonzeka]

Check your exhaust system for any leaks, it's probably sucking in small amount of air which makes the lambda reading go high.

[simba1]

Check your exhaust system for any leaks, it's probably sucking in small amount of air which makes the lambda reading go high.

Thank you Anders! I will have that checked right away! But what about the jumping/not so regularly-smooth RPM...? there have been times when it hit 2200-2400RPM in stopped traffic... :/

[Alex_s]

Rpm problem might be caused by a vacuum leak? or maybe a bad throttlebody/intake gasket?

[simba1]

Rpm problem might be caused by a vacuum leak? or maybe a bad throttlebody/intake gasket?

Thanks Alexander! I've been trying the same thought now for gasket and vacuum leak... If im right... there are 2 different air valves on this intake.. (behind the throttle body)... should i check them out? Does this have to do anything with a faulty MAP sensor possibly?

[Bullet---]

Rpm problem might be caused by a vacuum leak? or maybe a bad throttlebody/intake gasket?

Thanks Alexander! I've been trying the same thought now for gasket and vacuum leak... If im right... there are 2 different air valves on this intake.. (behind the throttle body)... should i check them out? Does this have to do anything with a faulty MAP sensor possibly?

Its a common problem that the FITV and the IACV can mess upp the idle rpm, happend to alot of people. Even me. There is a thermostat in the FITV under the throttlebody that gets lose inside, its hold in place by a plastic-cup that needs to be cleaned and retightend.

Check that the o-rings arent damaged, kan be ordered new at a honda-dealer/workshop.
The IACV is very simple to clean, losen the coolant hoses and the 2 screws, spray the inside with brakecleaner till its clean.
And like the others said, check for vacuumleaks and leaks in the exaustsystem.
I found a thread on Honda-tech so you can clean the FITV, step by step.
http://honda-tech.com/showthread.php?t=1564019

[simba1]

Rpm problem might be caused by a vacuum leak? or maybe a bad throttlebody/intake gasket?

Thanks Alexander! I've been trying the same thought now for gasket and vacuum leak... If im right... there are 2 different air valves on this intake.. (behind the throttle body)... should i check them out? Does this have to do anything with a faulty MAP sensor possibly?

Its a common problem that the FITV and the IACV can mess upp the idle rpm, happend to alot of people. Even me. There is a thermostat in the FITV under the throttlebody that gets lose inside, its hold in place by a plastic-cup that needs to be cleaned and retightend.

Check that the o-rings arent damaged, kan be ordered new at a honda-dealer/workshop.
The IACV is very simple to clean, losen the coolant hoses and the 2 screws, spray the inside with brakecleaner till its clean.
And like the others said, check for vacuumleaks and leaks in the exaustsystem.
I found a thread on Honda-tech so you can clean the FITV, step by step.
http://honda-tech.com/showthread.php?t=1564019

Thanks a bunch Andre! This really helps and explains alot!

Would you happen to know or have access to a complete pictorial on the steps in removing intake manifold and replacing the gasket for a D16Z6?

Have a nice rest-of-Sunday!

Cheers!

[Bullet---]

http://www.spoonertuner.com/manuals

Go into that website and download:

Civic 1992-1995 EG3 EG4 EG5 EG6 EG7 EG8 EG9 EH1 EH2 EH3 EH4 EH5 EH8 EH9 EJ1 EJ2
Si B16A2 EDM HELMS
141 MB.

Its a complete workshop-manual from Honda. Its a big help when you need answers and detailed descriptions while working on your car.

[simba1]

http://www.spoonertuner.com/manuals

Go into that website and download:

Civic 1992-1995 EG3 EG4 EG5 EG6 EG7 EG8 EG9 EH1 EH2 EH3 EH4 EH5 EH8 EH9 EJ1 EJ2
Si B16A2 EDM HELMS
141 MB.

Its a complete workshop-manual from Honda. Its a big help when you need answers and detailed descriptions while working on your car.

Haha Wow! Thanks Andre! A nice story book for my winter project I guess...

Cheers!
Ethan