Won't Stay Running

[carter]

It'll start rev high for a moment and then go back down to idle and won't stay, it'll just die back out. And it has no codes

[USPturbo89]

did u check the throttle cable?

[hvyman]

isc valve.

[carter]

I can push on the throttle and keep it running it just won't idle. But I'll check the isc valve when i get back to the car.

Carter, J.

[rumptis]

Have you checked your codes?

[carter]

No codes, But i found one of the reason's is that there was a piece inside of the isc, and that helped out. But it still has a chopped idle

[carter]

Coolant gauge doesn't work now at all...

[wiseco7mgt]

Sounds like your afm to me, check connection to that and do the test as suggested in the tsrm.

[rayall01]

Sounds like your afm to me, check connection to that and do the test as suggested in the tsrm.

The AFM has nothing to do with idle. You could unplug it, and it would still idle fine.

[kotu100]

The AFM has nothing to do with idle. You could unplug it, and it would still idle fine.

it will stay idling, but it wont idle properly, and will die sometimes. if the AFM is dirty, plug messed up, or that lil stupid gasket in the plug is missing, it could cause the car to die out.

[jetjock]

^ On that note (and because I'm bored today) here's a little demonstration of the TCCS in action. Engine was stone cold and every rpm change is me manipulating the throttle. If your car won't do this there's something wrong with it...

http://tinyurl.com/mmsw3n

[rayall01]

it will stay idling, but it wont idle properly, and will die sometimes. if the AFM is dirty, plug messed up, or that lil stupid gasket in the plug is missing, it could cause the car to die out.

Gotta bust you on that. It had to be something else contributing to it. The TCCS doesn't even use AFM input at idle, IIRC, and you can even drive the car with it malfunctioning or disconnected.

[jdub]

^ On that note (and because I'm bored today) here's a little demonstration of the TCCS in action. Engine was stone cold and every rpm change is me manipulating the throttle. If your car won't do this there's something wrong with it...

http://tinyurl.com/mmsw3n


But, there's no AFM....LOL :D

[Yblegal91t]

im sure those vacuum lines are good for the turbo

[jetjock]

^ Looks close but isn't. They don't reach.

Dub: Yeah, lots of stuff missing ;)

Rayall: The ECU does use the AFM at idle but doesn't for starting.

[rayall01]

^ Looks close but isn't. They don't reach.

Dub: Yeah, lots of stuff missing ;)

Rayall: The ECU does use the AFM at idle but doesn't for starting.

How come the car idled in the vid then?

[jetjock]

I meant it normally uses it. In the vid it's operating in fail safe mode. When the AFM signal is missing the ECU looks at the status of STA and IDL, combines those with the NE signal, and falls back on two fail safe maps to start and run the engine. Under those conditions the main limitation is no operation over 3K rpm and, in this example, no boost of course. More about fail safe here:

http://www.mkiiitech.com/forum/showthread.php?t=843

Edit: Apologies to Carter for the thread jack. My guess is a faulty ISC system or an induction leak...

[rayall01]

OK, in the strictest sense, I'm wrong, but overall I'm right about it not being the cause of his issue. His AFM is not the cause of his problem.

[jetjock]

Yes, of course. I never said you were wrong. In fact you're right. The vid was mainly directed at those who are always claiming the engine won't start or run with the AFM unplugged. You and I know better. Here's hoping everyone does now...as long as they don't have a 7MGE of course.

[rayall01]

Yes, of course. I never said you were wrong. In fact you're right. The vid was mainly directed at those who are always claiming the engine won't start or run with the AFM unplugged. You and I know better. Here's hoping everyone does now...as long as they don't have a 7MGE of course.

I was just admitting my mistake about it not bring used for idle at all. I see that I was wrong about that particular tidbit of info. Not saying anything about your correction. No harm, no foul.

[kotu100]

i know the engine will start and run without the AFM, but it could also cause it to stall out. i had this problem with my car. the gasket in the afm plug was missing, i replaced it and my problem went away 100%. the car would start and idle (jumpy though), it even went WOT fine, but on decelleration or hitting the clutch from 2k+ rpm or revving from idle it would stall out.

i mention this because its probably the easiest thing to check, and cheapest to replace.





Can't we all just be right? :icon_bigg

[jetjock]

Sure, we can all be right, although I can't see why the gasket would matter. Me thinks you were a victim of "post hoc ergo propter hoc"...

[kotu100]

i couldnt either, but for some reason that was the only thing that fixed it, and if i take it out the problem comes back.

[jetjock]

Well, anything is possible I suppose. Next time I'm back home (I'm from the South Shore) maybe you can show me :)

[kotu100]

where in the south shore? i'd be happy to :)

[jetjock]

America's Home Town: Plymouth. Don't get back often though.

Carter, J: any updates?

[carter]

No not really, I meant to go work on it. but haven't been able to. We got it to hold an idle at 1k nothing really below that. Revving it, there's no problem just idle is where it seems to not wanna do.

But the coolant gauge doesn't wanna work, I'ma try and bleed the system and see if i can get anything. If not, I have a gauge for it, that i'll just hook up for the moment.

[carter]

also got into boost just to see if it'd cut out or anything. (2psi) and it seems to do well... its just the idle everything else seems to be ok

[kotu100]

also got into boost just to see if it'd cut out or anything. (2psi) and it seems to do well... its just the idle everything else seems to be ok

just check the AFM plug real quick make sure the gasket is there, it only takes 10 seconds.