Idle/Stall

KMCGINLEY

MEMBER
1999 SATURN SL2
4 CYL
107,000 MILES

I have a 99 Saturn SL2 @ 109K mi. At 108K, when switching over to idle at a stop light after driving 50 mph for 10 min or so, it started choking like the engine was going to die-I managed to get it to a shop, using the brake and accelerator at the same time-they ran a scan and it came up with EGR flow problem-they cleaned it and the throttle body out, problem went away. Then 10 da later, I drove 120 mi @75-83 mph, came off the highway, started going 30 mph, did a few stops, car did the same thing-got to my destination in a few mins, turned off the engine, tried to restart 10 min later-took 3 cranks but got it going til I made it back on the highway, and after going 75-78 for 10 mins or so, it appeared to be fine again. Did another stop, restart after 10 hours, drove on the highway again, but only 55 mph for 30 mins, and it didn't occur again. Someone told me sounds like the IAC (valve?)But I'm wondering if a vac leak and connections should be checked first?

1 Reply

SATURNTECH9

MECHANIC
30,869 POSTS

Usually a vacuum leak cause's a high idle but a small enough one can cause a rough idle. You can check for a vacuum leak I would also try removing your iac valve and cleaning it and the port that it goes in. You could also have a bad coolant temp sensor pretty common on that car.I would also check the connector and see if it was corroded pretty common for that. The sensor leak's into the connector corroding it.