Closed On Monday
Intermittent idle problem
every once in a while.. sometimes on cold morning's when i start my car it will idle anywhere between 1500-2000rpm
and when i take my foot off the throttle and put the clutch in the
revs dont drop as quick as what they normally do
on occasion's if i rev it alittle with the clutch in it will idle properly
but the rev's still wont drop as quick as they should
and then there is the good days where it runs like a dream
now i have replaced the tps and iac so its not that!
the car is a vt s1 v6 manual with a 69mm throttle body
when i installed the throttle body it was fine for a month or so then it started playing up after i went for a cruise to the city
a few days before that i had it in the mechanics.. change plugs and fuel filter
he also removed the grill for my maf saying that it gives better air flow
Your freedom ends where mine begins
He removed the grill and then it started playing up?? If thats the case he potentially damaged the sensor in the MAF.
Any warning lights?
Closed On Monday
no warning lights
p.s Hay Jester
Your freedom ends where mine begins
Hey mate...
Did it start randomly or after your mechanic de-combed the MAF?
Closed On Monday
no it happened two days later after coming back from the city
Your freedom ends where mine begins
and you have replaced the IAC and TPS since... correct?
I would be having a good look at the MAF to make sure it looks all good...
also, was the comb that he took out clean or did it have residue on it?
Do you have an oiled filter?
Closed On Monday
Exhaust Guru
Put the mesh back into the MAF, it makes no difference to flow. It is there to ensure an even flow over the sensor.
Your freedom ends where mine begins
well my first suspect would have been the TPS... it indirectly controls the IAC which is what will be causing the revs to jump up and idle that high and fall slowly...
Basically my understanding is:
The IAC opens when the TPS says that the throttle is being opened and the MAF does not sense the required volume of air passing through it.
We have eliminated the TPS at this point so the MAF is suspect number 2...
I think its too much of a co-incidence that 2 days after it was de-combed you have an issue like this.
My suggestions:
- Inspect the MAF... there are 3 little sensors... 2 in one half and 1 in the other.
Make sure that are all in good visual condition.
- Get a tissue and really gentally clean any residue from them... now that the comb is gone oil from your filter may have settled onto one of the sensors and thus the MAF is reading that less air is passing through it.
- If you have a mate with a VT to VX ask really nicely if you can swap MAF's for a couple days and see if this fixes your problem OR causes it for them.
- Last resort... go to Holden and get them to do an error check, and this coming from me... I wouldn't recommend going to holden for ANYTHING most of the time...lol.
Good luck.
Your freedom ends where mine begins
Originally Posted by Not_An_Abba_Fan
It does improve the flow.. the mesh takes up about a good 1/4 of the pipe area that the air flows through... better throttle response...
And the only way to remove the mesh is to damage it... so once its out... its out... never been able to put a mesh back in.
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ive had my car hook up to a tech 2 and its not recording any problems
ill clean the maf but i dont have the grill or anyone to swap with at the present
Your freedom ends where mine begins
Ok.... so its fairly safe to say that since there are no error codes the MAF is probably sending an incorrect reading and this is the root of your problems...
Downlside being looks like your MAF is screwed...
So i would be taking it to the mechanic and getting him to give you a new once since he did something to your car without concent im assuming and what he did is technically damaging it.
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Exhaust Guru
Hate to disillusion you, but no, it doesn't take up 1/4 of the internal area, it's only about 8%, and if you are careful removing it, you won't damage it. I did an experiment with my VS with and without the mesh, no difference in economy, no noticeable difference in power. Better throttle response was achieved by changing to a hi flow air filter and CAI.
Your freedom ends where mine begins
Dude, this isn't a p*ssing contest cause im gonna say one thing which I know is right and your gonna say another which you know to be right.
I'm telling you what it did in my VX... difference ECU to yours... maybe you didn't get gains but I did.
BUT, currently try to focus on helping Freak out with his car issue rather than trying to prove me wrong.
Freak,
Looks like your in for a new MAF... thats my opinion anyway...wreckers would be the obvious first stop.
Good luck mate
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Exhaust Guru
I am trying to help him. The problem started when the mesh was removed. It is there to create an even flow of air over the sensor. Put it back and the problem should go away. If it doesn't, I'm wrong, but it is free to try.
Closed On Monday
i dont have the mesh or i would do so.. the mechanic did it and he is in vic
i am now in syd
Your freedom ends where mine begins
^^^ Fair enough...
Though I would be assuming the mesh would be in Vic with his mechanic and he is in NSW now.
I'm still leaning towards the MAF being damaged rather than removing the mesh causing this.
Yeah... there doesn't look to be any solution to this that doesn't involve a new MAF in your case mate... unless you can somehow get your hands on the MESH... but mesh and MAF are one part as such so thats not likely...
Exhaust Guru
If the sensor was damaged it should log a code, probably 32. Check for vacuum leaks around the throttle body, inlet manifold and PCV system, including making sure the dipstick is seated properly and the O ring is not cracked. Also make sure all connections after the MAF are tight and not leaking.
Do you know anyone with a VT? Try swapping MAF's see what happens.
Closed On Monday
i recently pulled of the throttle body clean it and re connected everything.. ill have a look at the maf when i get home.. the guys over at mace also suggested resetting my computer
heading home from work.. ill pop on later and tell you how i go
Your freedom ends where mine begins
^^^ Didn't think of the vacuum hoses... Good pickup.
He would have had to disconnect them to take the TB off to remove the mesh...
I recall the one with a rubber elbow being a pain in the but and slipping abit in my VX.
EDIT:
Good Luck... can't see the computer reset doing much but yeah... give it a crack...
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i cleaned the maf.. it looked a little dirty but no more than you would expect
took it for a test drive and it seemed fine.. now its just a waiting game to see if it ****s up again
on another note i think my alternator is on its way out
Your freedom ends where mine begins
^^^ fingers crossed it was just a dirty sensor then... good luck mate...
Not so good that your alternator is on its way out... whats make syou think that?
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i put a new battery in and its not staying at 14 volt's like it should and it making a weird noise
it sound's like it does when you pull the clutch out with rev's till it nearly stall's... if you understand what i mean
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