2003 Chevy Silverado

[big2bird]

My truck, with 100,000 miles, now occasionally stalls doing a u-turn. Pump works, fuel tank high, medium , or low, doesn't matter. I have run injector cleaner and water remover a few times. Arbitrarily, warm or cold. Can go weeks without failure, then boom. Any ideas?

[Vettezuki]

My truck, with 100,000 miles, now occasionally stalls doing a u-turn. Pump works, fuel tank high, medium , or low, doesn't matter. I have run injector cleaner and water remover a few times. Arbitrarily, warm or cold. Can go weeks without failure, then boom. Any ideas?

When I drove it to Lowes, I noticed it had a kinda funny throttle response too. It seems ECU/Electrical to me, like the MAF is giving the computer bad data about air flow. :huh: Not much of an idea, but there tis.

[enkeivette]

Maybe one of your high idle swtiches is f'd up. Not sure if that's what it's called... or how they work on ECM cars. But I know that there is compensation when you run the AC, or put load on the power steering. If one of those compensation sensors was not functioning, it might allow the motor to idle at too low of an rpm. If this happens while making a u-turn, while the steering is under full load, maybe it's the PS sensor.

[big2bird]

When I drove it to Lowes, I noticed it had a kinda funny throttle response too. It seems ECU/Electrical to me, like the MAF is giving the computer bad data about air flow. :huh: Not much of an idea, but there tis.

I should try cleaning the MAF again..

[enkeivette]

Don't like my diagnosis? Think about it, sudden change in engine vacuum plus load on the PS pump plus lack of idle speed compensation (if the sensor is bad)... makes a lot of sense.

If my POS neon has a sensor for this, I'm sure your spiffy new Silverado would too.

[big2bird]

Don't like my diagnosis? Think about it, sudden change in engine vacuum plus load on the PS pump plus lack of idle speed compensation (if the sensor is bad)... makes a lot of sense.

If my POS neon has a sensor for this, I'm sure your spiffy new Silverado would too.

I like all the input. I just know that it "hunt's" when that MAF is dirty, as I have encountered that before.
Your diagnosis will be looked into, and is appreciated as well.

[enkeivette]

I like all the input. I just know that it "hunt's" when that MAF is dirty, as I have encountered that before.
Your diagnosis will be looked into, and is appreciated as well.

Gotcha, thanks for stroking my ego anyways. :bigthumbsup:

[big2bird]

Don't like my diagnosis? Think about it, sudden change in engine vacuum plus load on the PS pump plus lack of idle speed compensation (if the sensor is bad)... makes a lot of sense.

If my POS neon has a sensor for this, I'm sure your spiffy new Silverado would too.

I looked today, and when it stalled, the tach had dipped to 400RPM or less during the turn. You might just have siomething here.

[enkeivette]

I looked today, and when it stalled, the tach had dipped to 400RPM or less during the turn. You might just have siomething here.

I'm amazing...

Take it out, brake clean it and the female side, PS fluid could be preventing electrical contact.

Btw, when we took a ride in that side pipe C3 I did blame the fuel pump and was wrong about that, but my first suggestion while driving was ignition. Which we dismissed for whatever reason.

[big2bird]

Btw, when we took a ride in that side pipe C3 I did blame the fuel pump and was wrong about that, but my first suggestion while driving was ignition. Which we dismissed for whatever reason.

Not really. The pump cured the WOT miss. The ignition problem was the stalling while hard cornering. The primary wire shorted out under the breaker plate.

[94cobra69ss396]

I'll ask Throttle Crazy to respond to this when I see him today. I'm not sure if your truck has one but if this was happening on my Explorer or my Cobra I would clean the IAC (Idle Air Control valve). It's an electronically controlled value that opens to let more air through the intake to keep the idle steady. Such as when the air compressor engages or when you make a turn at low speeds which loads the engine.

[enkeivette]

Not really. The pump cured the WOT miss. The ignition problem was the stalling while hard cornering. The primary wire shorted out under the breaker plate.

So I was right about everything? Sounds more like me. :sm_laughing:

Not to pat myself on the back too much... fuel and spark, what else is there? :nuts:

[enkeivette]

Not relevant, but a show of my redneckness, there is also a high idle function when you drop engine load suddenly (depressing the cluch getting off the highway). Since my speedo sensor aint working, my Neon would stall. So I put some zip ties under the throttle stop. :judge: :bigthumbsup:

[big2bird]

Not to pat myself on the back too much... fuel and spark, what else is there? :nuts:

Broken pistons/rings.:nutkick::nutkick::nutkick::smack::smack:

[SeanPlunk]

Broken pistons/rings.:nutkick::nutkick::nutkick::smack::smack:

WINNER :bigthumbsup:

[enkeivette]

My car is still faster than both of yours, it just puffs like a steam engine. :toocool:

And yall better hope that my pistons are intact, if I need to buy new ones I'll get some to drop the CR and order a smaller pulley to match. :eek:

[big2bird]

My car is still faster than both of yours, it just puffs like a steam engine. :toocool:


My Model T is smoother and faster at this point in time.

[enkeivette]

My Model T is smoother and faster at this point in time.

:surrender: When are we going to get around to dropping a 632 in that car anyways?