• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

engine can't handle load...

G

gotboost3

New member
ok guys i know i have a vac leak that is causing an unsteady idle but i noticed something odd today...any time an acc is used on the car at idle my engine plummets to 450 rpm, for example if i turn the wheel at idle (powersteering) the rpms drop instantly, also when i switch on the headlights my rpms drop too, just my headlights....weird, anybody know what would cause this?
 


Sounds like your IAC might be bad or may just need a cleaning. The IAC compensates for things like this such as when the A/C comes on or a load is put on the engine while running. But only when it is idling or close ot it. When the RPM's go up the IAC cuts out. All it is there for is to keep the desired idle set by the PCM in the correct place.
 
Could it also be the alternator is taking a crap? I had symptoms like this too when it wasn't charging...might have it tested...just my 2 cents.
 
ill clean my iac asap and i used to have a loud system that abused my alt so maybe thats it....ill check to see if i get voltage drops when it dips...
 
gotboost3 said:
ill clean my iac asap and i used to have a loud system that abused my alt so maybe thats it....ill check to see if i get voltage drops when it dips...
Click to expand...



Your going to get voltage drops when the idle dips. It's putting a strain on everything. And that's why your loosing idle speed. knowing the other problems it's not going to be your alternator. But that's just my .02 :)
 


gotboost3 said:
ok thanks would a vac leak cause drops at specific times liek that or is that most likely a IAC problem?
Click to expand...

Any time you have unmetered air entering the engine and the load changes, odd behavior will occur. You need to fix the vac leak before you can trouble shoot something else.
 
Sabrewings said:
Any time you have unmetered air entering the engine and the load changes, odd behavior will occur. You need to fix the vac leak before you can trouble shoot something else.
Click to expand...

ok thanks man im stil hunting down this leak i think its a bad sc gasket....because mine ripped when i took off the blower but i still re used it because i didnt have a new one at the time....would you say thats prob it?
 


You must log in or register to reply here.
Back
Top