GunSamir

Hello everyone,
I have a 1999 Honda Accord CG8 1.8 VTEC Engine F18B3 with 130000 kms.
I have few issues and questions on it.

First, The idle speed is too low (about 500 rpm) and have difficulties to startup when cold. I wanted to adjust the idle rpm from the IACV as described on most Honda's but mine does not seem to have a IACV. Is this possible or am I missing something?

















And I could not determine if this is the IACV or the FITV, but my guess is it is the FITV




Thank you in advance.

Dannyvho

I think your car does have an IACV, at least my 1999 F18B2 Accord has one. It does not have a FITV.

The hole inside your throttle body near your index finger leads to the IACV (first two pictures). It sits between the firewall and the throttle body and has a connector attached to it.
Last two pics show your throttle valve.


Hope this helps.

GunSamir

Thank you for your reply. I just noticed that there was a problem and my pictures were duplicated. I just corected it.

Now the 2 nd pic shows the throttle body from the manifold side. and the last picture shows the valve that I thought is the FITV.

So this is the IACV according to you?

I hope this makes it a bit more clear.

Thank you

Dannyvho

Thanks for correcting the pics. Yes the last pic is the IACV, there is no FITV on these cars.
Don't forget to reset the ECU after cleaning the air intake system: this way the ECU can adjust to the changed behaviour of the system.

GunSamir

Hi thanks again for the reply Dannyvho,

what you said makes more sense about that part being the IACV rather than the FITV as it is connected at the back of the intake manifold right after the throttle body, and that hole in the throttle body does lead directly to that valve where the second side of it conducts air to the manifold through that hole where the red handle of the screw driver appears (See picture)





Otherwise, when the throttle valve is at closed position (Idle) there is no passage for the air to the intake.

I do not know if resetting the ECU with this valve is gonna do any good as it is broken from the side where the connector is attached. I guess it needs replacement.

GunSamir

Another question is that, while removine the manifold for cleaning, I found the following sensor broken (I'm not sure if it was broken before or if I dropped the manifold on it and broke it) and I could not identify what it is. I










It sits on the block at the back right above the oil filter

HondaPartsHero

knock sensor

GunSamir

Thanks, and what does it do? what is its role?
Can the car at least start with it being broken?

HondaPartsHero

Essentially a very sensitive "microphone" mounted on the engine that's tuned to the sound frequencies typically found during detonation (pinging). When they are detected, it converts this to a signal that the ECM can read so the timing can be adjusted.

Dannyvho

With a knock sensor signal missing the only thing the ECU can do is revert to 'limp' mode and throw a CEL code.

GunSamir

OK, Thank you guys, I'll try it with that sensor disconnected and see what it gives.

Now, for the idle speed problem, If I manually adjust that IACV to give more air into the intake, and with that plug side being broken, is there a possibility that the ECU will sense the change and starts injecting the adequate amount of fuel for proper idle rpm?! because i think if i just give it more air and the amount of injected fuel stays the same it is snot going to give it more rpm, is it?

Dannyvho

If you want to feed more air then you could adjust the throttle cable so that the throttle valve slightly opens. (as from 2006 models there is no IACV anymore: the ECU can operate the throttle valve to adjust the idle speed).
Best option is to replace the IACV of course.

BTW nice cleanup job on the intake manifold

GunSamir

I thought about that one too and actually tried it, and I think I'll go for it for some time then will deicide about the IACV.

for the maifold here is how it was if you wanna see it, it looks like the previous owner nevered cared about changing the air filter (and which had actually a quite big hole on it when i bought the car) there was a mixture of oil and sand in the manifold.

GunSamir

I guess I know what to do now about the idle speed, I'll try those ideas and see how it goes.

I have another question about a white smoke from the exaust only at relatively high rpm. It starts between 2500 and 3000 rpm. and it becomes more noticeable and condense at around 5000 rpm.
Below 2500 rpm, nothing!

I'm thinking because of the bad air filter it had and because of the dust and sand particules found in the intake manifold, they may have caused some damage to the rings or the cylinder walls themselves.

I would like to have more ideas or test tips here too.

Thanks in advance

Dannyvho

That really hurts! Do we have to go as far as checking the airfilter then, when we buy a car ?

I don't know for sure where the white smoke comes from. Best thing to do imho is to keep an eye on the fluid levels (oil and coolant).

GunSamir

Hi1,

In order not to mess things up with the other topics, I preferred to create a separate topic for every issue I have on my 99 Accord.

Well, this one is about the white smoke that I get from the exaust above 2500 rpm.

Below 2500 rpm, nothing, no smoke at all
At ~ 2500 ~ 3000 rpm a light white smoke starts coming out of the exaust
At ~ 5000 rpm it becomes quite heavy and more dense!

What's the most likely reason for this? Piston rings? Head gasket? VTEC system? Valve seats? ...

The car is a 1999 with 13000 kms. Engine F18B3


thanks in Advance

GunSamir

For info, I removed the intake system (filter, TB, intake manifold, ..) for cleaning and found some oil/sand/duct deposit in the manifold as it may be the reason. I am thinking some dust/sand particles got into the combustion chambers and degraded the rings / cylinder walls.

The car has sat down for some time without running. Don't know for how long.

Hope this helps.

GunSamir

Yes I'll keep an eye on it as i'll be using the car more next few weeks. i haven't been using it much lately for the work being done on it.

thanks

-RedneckDave-

Threads merged.

GunSamir

I can't get the engine to start now.
Could it be because of the broken knock sensor?

When trying to start it up, sometimes and when keeping the key on start position the engine starts but feels very weak and then it dies in few seconds.
Fuel is OK
Plugs are OK
Timing is OK

Also, could a bad TPS sensor or absense of signal from TPS sensor prevent the car from starting?

Thank you

GunSamir

Does anyone please have an idea on this one?
All I did is remove the throttle body and manifold for cleaning. I replaced everything back and the car does not start.
Like I said before, i am not sure if the knock sensor was already broken or it got broken during removal/mounting of the manifold.

If i insist on the ignition for long time, the car looks like it starts but it dies as soon as I release the key.

thank you

GunSamir

It is to mension that the car has not started for 2 months and few days, if that could be the reason or help determine the reason why it does not start now.

Thanks

poorman212

So let me get this right, it was starting before? Your first post leads me to believe it was running....most common issue is missing a ground connection. So the first question I have to ask is that you double check those. Are you getting spark at the plugs.

GunSamir

Yes, the car was running before. It had a low idle issue, but apart from that it was running fine.
All I did is remove the throttle body, IACV, and manifold for cleaning. I cleaned them and re-assembled everything and the car does not start now. The process took a little more than 2 months if that could be the reason.
I am getting fuel up to the injectors
I am also getting spark at the plugs.

poorman212

Ok this sounds good, have fuel and spark (air is almost always a given) and it will not start.....one more before going further. Are you getting power to the injectors, fuel is there but if they are not opening then we don't have fuel.
If that checks out then something is out of proportion. Spark at the wrong time (T belt slipped, timing off, ect) but you've check that. Not enough fuel or too much. You mentioned something about the TPS, can you tell more. why you mentioned that. Then yes there is the knock sensor.