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Car stalls when it warms up

Tiny
RMONET2012
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  • 46 POSTS
Can you please send me the scan tool procedure for the TPS recalibration?
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Thursday, September 13th, 2012 AT 6:25 PM
Tiny
KHLOW2008
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Sorry, I thought I had sent you the procedures which were for the IAC.

For your model, the TPS cannot be adjusted but you can check its calibration. If it is out of specs, you need to replace it.

V6 THROTTLE POSITION SENSOR

1) Ensure engine is at normal operating temperature. Install 3 jumper wires between TPS and TPS wiring harness connector.

2) Turn ignition on with engine off. Connect a DVOM to Dark Blue and Black wire terminals. With throttle at closed position, adjust TPS to obtain specified voltage.

3) Tighten screws and recheck readings. Turn ignition off. Remove jumper wires and reconnect harness connector to TPS.

TPS ADJUSTMENT VOLTAGE

At idle RPM or closed throttle..50-4.8 V
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Thursday, September 13th, 2012 AT 6:41 PM
Tiny
RBERQ
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As you said, KHLow, "When the TPS is disconnected, the PCM is not going to recognise the amount of throttle opening and this would result in it reverting to preset values."

Exactly my point. If the car will rev and go up hills when it is getting no signal from the TPS, then we will have isolated the problem to the TPS, or to the wiring between the TPS and the computer. Trouble with braking probably just means the engine is idling much higher so it is harder to stop the car.

Rmonet2012, my apologies, I was not trying to deceive you about my expertise as a mechanic. I do have some experience, but I am not about to hang out my shingle and open a repair shop. Anyone can respond to questions here, and from reading other threads (not this one) I can assure you there are many less qualified people providing "authoritative" answers.
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Friday, September 14th, 2012 AT 12:27 AM
Tiny
RMONET2012
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Well it would have been nice to have a heads up. Because the brakes were not working, I nearly slammed into a tree across the road.
The car died and had to be pushed back to the driveway.
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Friday, September 14th, 2012 AT 4:50 AM
Tiny
RMONET2012
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I changed the TPS and the idle seems to be
stable, but I have another problem now.

The brake petal sinks down to the floor and the brake fluid is low
again after I replenished it. It looks like a I have a leak somewhere.

Q - How do I check (trace)and located the leaky brake line?

Q - Is it easy to fix or do I need to get the car to a shop?
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Saturday, September 15th, 2012 AT 7:19 PM
Tiny
KHLOW2008
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The brake lines goes from all wheels and should not be difficult to detect if the leak is bad.

Work depends on what is leaking. Check all wheel and brake caliper first. Look out for signs of wetness.
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Saturday, September 15th, 2012 AT 10:52 PM
Tiny
RMONET2012
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Found a leak by the left (driver's side) rear tire; not sure if it's the hose or brake line. Are there any videos that show how to repair it?
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Sunday, September 16th, 2012 AT 4:51 PM
Tiny
RMONET2012
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The car starts fine and warms up with no problem - idle level are within normal range (600-800), temp is good and oil pressure is level.

The car sounds great for about 5-10 minutes; then the idle gets rough and eventually stalls. I have to wait for the car to cool down before I can start and keep the engine on.

Someone mention that the ECU might be the cause to the stalling. The 91 3.1 Corsica has a documented record with ECU and fuel injector problems.

What do you think?
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Thursday, September 20th, 2012 AT 9:08 PM
Tiny
KHLOW2008
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If you do not have any trouble codes, it is possible for the ECU to be the cause.
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Thursday, September 20th, 2012 AT 10:33 PM
Tiny
RMONET2012
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Do you mean impossible or possible?

Can it still be possible for it to be the problem without any codes?
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Friday, September 21st, 2012 AT 12:05 AM
Tiny
KHLOW2008
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Possible and yes, no codes showing.
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Friday, September 21st, 2012 AT 6:28 AM
Tiny
RMONET2012
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What is the procedure (step-by-step)for replacing the ECU?
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Friday, September 21st, 2012 AT 6:45 AM
Tiny
KHLOW2008
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Removal

Ensure ignition is in OFF position. Disconnect negative battery cable. Remove electrical connectors from ECM. Remove ECM from vehicle. Remove MEM-CAL or PROM and CALPAC (if equipped) from ECM.
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Friday, September 21st, 2012 AT 6:54 AM
Tiny
RMONET2012
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What are the steps after I connect the new ECU and start the car again?
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Friday, September 21st, 2012 AT 4:43 PM
Tiny
KHLOW2008
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Let it run for a while and go for a test drive to allow the PCM relearn.
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Friday, September 21st, 2012 AT 8:46 PM
Tiny
RMONET2012
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Someone mention the stalling problem may be caused by a bad tcc.

What do you think?
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Friday, September 21st, 2012 AT 11:47 PM
Tiny
KHLOW2008
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Check for trouble codes.

TCC fault would normally cause engine to stall when gears are engaged.
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Saturday, September 22nd, 2012 AT 12:33 AM
Tiny
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Would a TCC fault cause the car to stall if I give it gas while in park?
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Saturday, September 22nd, 2012 AT 5:46 AM
Tiny
KHLOW2008
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It should not if you are giving gas but would stall once the gs is released. If you want to do this test, you need to monitor the engine rpm. If rpm goes up to more than 2k, the torque converter is not stuck.
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Saturday, September 22nd, 2012 AT 8:35 AM
Tiny
RMONET2012
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Is this the TCC plug connector?
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Saturday, September 22nd, 2012 AT 6:53 PM

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