imported_Gatsby

Hi.

My 92 Cavalier tends to shut-down, while the engine is running and car comes to a stop (intersections, traffic lights, stop signs for instance).

I changed the plugs ( they had to be changed...) and pour a fuel injector cleaner in the tank. Fuel and Air filter have been changed recently, along with the battery, alt and other stuff. Oil is good and ignition wires didn't seem to be cracked...

So what could it be? The engine struggles to stay on and comes-in and goes-out if you know what I mean....

solidredhatch

its american noone knows y those cars do nething they do

just drive the gastmobil dude

imported_civic_fan

maybe your IAC is sticking or seized and your engine is starving at idle....Thats where Id check

imported_Gatsby

Whats IAC ?

And thats exactly it! It starves at idle. But why? How can I fix it?

imported_civic_fan

IAC is the Idle air control valve....it basically acts as a bypass to the throttle plate when your foot is off the gas....the best way to fix it is to buy a new one....chances are, the one thats in your car is NFG cause if it was sticking, the idle would be "searching" up and down...the fact that it completely dies tells me that your IAC is stuck shut.....dont quote me on this, but its a likely problem

bbarbulo

iTrader: (2)

auto or manual?

could be EGR, PCV, or IACV

OttawaSi

I had the same problem with my ex-DSM back a few years back. But all i Had to do was fool around with the Idle sensor, change the idle timing or something..and it was easily fixed

imported_Gatsby

Its an Auto. And it "SEARCHES" all the time know. It doesn't shut-off as much, but "searches" constantly at idle....

imported_civic_fan

sounds like the IAC to me.....but I could be talking out of my a$$....but Im pretty sure thats your problem....anyone else?

kwikb16a2

id say try the pcv valve first, its only a few dollars so your not losing out. Happened to my dads gm aswell

bbarbulo

iTrader: (2)

IACV wouldn't do that. it responds to other inputs... so if it responds at all, it means it's working. the surging idle means it's responding. other than cleaining and resetting the pintle, I think you're okay. I'd check the other inputs.

imported_Gatsby

Other inputs like what? What else could it be?

imported_zc_hatch

...my civic does that untill i hit the a/c button

blk93si

its could be the map sensor

imported_civic_fan

the idle wouldnt search if it was the MAP sensor...and if Im not mistaken, dont cavaliers run mass air flow sensors? Anyways, if the IACV was dirty to the point that it becomes sluggish, the idle will search, as the IACV is slow to responding to the inputs...therefore, because the IACV is sluggish, it is playing catchup constantly at idle....hence the searching or surging idle...So that would be the first place id check....clean up your IACV and see if that cures the problem

imported_Gatsby

Thanks guys. I see what I can do.

Thanks.

Buff 'n Stuff

If it's automatic transmission, it's the lock up torque convertor sensor.

imported_Gatsby

Well, the newest thing is that the engine "SEARCHES" while I give it gas, and when I come to a complete stop, it shuts-off...

Are you sure about this? Should I go to CT and buy one of these (if they have one) and put it in? You have an idea were this sensor might be?

Man this Cavalier has such Weired engine bay design! Nothing is easy to access and you can't even see the distributor...:fustrated

Buff 'n Stuff

sent you a PM.

I'm 100, no, I'm 200% sure!

Trust me, I replaced every flippin sensor on my Cavalier, as well as filters, fluids, fuel pressure regulator valve, pcv valve, spark plugs, wires, ignition coil packs, shift module... you name it!!!

None of the above helped. It is the lock up torque convertor sensor.

Buff 'n Stuff

Oh yeah, I also did this too ^^^



(I even went to a mechanic and he told me it was that the intake manifold and head gaskets were leaking... and the fuel pressure regulator valve needed to be replaced... well, no, no, and no. )