89 Cav stalls when stopped at red light

[mb17180116]

I have an 89 cavalier 2.0L 4cyl with about 120,000 miles on it. When i come to a stop light or stop sign, after about 20 seconds or so, it will start to run very rough and it will shake and stalls and nearly dies...but comes out of it every time. It only does this when stopped, and runs just fine on the highway or any other time im moving. Tried replacing the fuel filter and the mass airflow sensor...thinking maybe the o2 sensor....any other suggestions?

[noshun]

Originally Posted by mb17180116

I have an 89 cavalier 2.0L 4cyl with about 120,000 miles on it. When i come to a stop light or stop sign, after about 20 seconds or so, it will start to run very rough and it will shake and stalls and nearly dies...but comes out of it every time. It only does this when stopped, and runs just fine on the highway or any other time im moving. Tried replacing the fuel filter and the mass airflow sensor...thinking maybe the o2 sensor....any other suggestions?

More than likely the IAC valve on the TB needs cleaning out with some carb cleaner. Other than that EGR valve. But more than likely IAC as it's during idle.

[mb17180116]

Originally Posted by noshun

More than likely the IAC valve on the TB needs cleaning out with some carb cleaner. Other than that EGR valve. But more than likely IAC as it's during idle.

Took out and cleaned the IAC valve with carb cleaner and a toothbrush...still had the same problem. Maybe ill try the EGR valve next...

[public]

Check for a vacuum leak. This is a classic vacuum leak description.

[shottenheimer]

Originally Posted by mb17180116

I have an 89 cavalier 2.0L 4cyl with about 120,000 miles on it. When i come to a stop light or stop sign, after about 20 seconds or so, it will start to run very rough and it will shake and stalls and nearly dies...but comes out of it every time. It only does this when stopped, and runs just fine on the highway or any other time im moving. Tried replacing the fuel filter and the mass airflow sensor...thinking maybe the o2 sensor....any other suggestions?

I had a similar-type problem with '93 Cavalier. My problem was with lock-up siliniod in the transmission. Cost about $200 to fix at a transmission shop. Dealer wanted $550. Don't know if this is true but was told this is a common problem with many GM vehicles.

[noshun]

Originally Posted by shottenheimer

I had a similar-type problem with '93 Cavalier. My problem was with lock-up siliniod in the transmission. Cost about $200 to fix at a transmission shop. Dealer wanted $550. Don't know if this is true but was told this is a common problem with many GM vehicles.

could have stopped the stalling for free!

[shottenheimer]

Originally Posted by noshun

could have stopped the stalling for free!

Interesting. What would you have done?

[noshun]

Originally Posted by shottenheimer

Interesting. What would you have done?

Disconnected the plug for the lock-up AKA torque converter Clutch. Blue plug on the underside of the trans housing. Will stop it engaging alltogether! Lowered gas mileage on the Highway but no labout cost.
Although yours was very cheap! It's like $25 for the part and the rest is labour stripping down the trans!