Engine stumbling at idle with a/c on

[rstark]

This problem seems to be getting worse. I can duplicate the problem on demand, and would like to know what it is before I take it back to the dealership. When at idle, if I rev the engine slightly with the a/c on, then engine goes down to around 700 - 800 rpm and feels like it's going to stall, but then goes back up to 1000 rpm and is stable. Anyone else experience this?

[S2KFL]

Try your TPS sensor

[rstark]

Anyone else? I'm taking my car in this Friday for service, so I'd like to get this and the spark plug TSB done (I'll wait on the clutch another year).

[Urmil]

I get it all the time.....and like you I can recreate it on demand. This is especially apparent on hot and humid days.

I assumed that my fix would occur once I switched out the thermostat and fan switch with modded ones, ad changed out my coolant with "performance" coolant (it's just coolant with a bit of watter wetter in it).

I was also planning on doing an upgrade on the fan with a dual fan by TFan, and a radiator block by Fluidyne.

Let me know what the dealer does for you.

Luder94

[rstark]

Urmil, are you running an aftermarket intake?

[Urmil]

Not yet

[desmo4]

Stumbling at idle was the first symptom of my burnt valve problem. You can read the saga in my earlier post. But the next symptom was stalling at idle. I would have the shop do a leak up test just to be sure.

Jonathan

[leon]

I have about 3600 miles on my '03. I am beginning to have a similiar problem. The car will go to 700 or so RPM then recover to normal idle. I associate this with the fact that it is just so darn HOT here in SoCal. I can't believe I've smoked a valve already? It seems ok in cool air.
I sure would like to find some higher Octane fuel, so it would run cooler........
Any help in this regard would be appreciated...........

[rstark]

I later installed the AEM cold air intake and the problem went away.

[desmo4]

For higher octane fuel you need only call Unocal 800 345 0076. I think in Southern Cal there are a few stations that dispense 100 octane unleaded.

Jonathan