Stumble off the line. - Chevy Impala SS Forum
 
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post #1 of 10 (permalink) Old 01-28-2013, 07:58 AM Thread Starter
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Stumble off the line.

94 caprice 9c1.
I had a cracked head, so I replace them with stock heads that were milled .015. While I was at it, I did the home plate delete, put super comp hooker headers on, air pump delete and deleted the egr tube from the header to the back of the intake.


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post #2 of 10 (permalink) Old 01-28-2013, 07:59 AM Thread Starter
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Stumble off the line.

And not it stumbles bad off the line. And seams slower overall.


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post #3 of 10 (permalink) Old 01-28-2013, 08:08 AM
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Optispark status?
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post #4 of 10 (permalink) Old 01-28-2013, 08:13 AM
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I've heard that hesitation can be a result of a defective EGR. Not sure what removing it would do or if this needs to be programmed out. Maybe something to consider.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #5 of 10 (permalink) Old 01-28-2013, 08:42 AM Thread Starter
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Stumble off the line.

I haven't touched the opti. I'm considering the delteq upgrade. The egr valve is still in place just not the tube.


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post #6 of 10 (permalink) Old 01-28-2013, 08:55 AM
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Quote:
Originally Posted by 9c1twiggy View Post
. The egr valve is still in place just not the tube.


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If the tube is removed, I would think the EGR system is inoperative.

Not sure what removn the egr does for you. Did you follow a documented process on removing the EGR tube/setup and how this may affect an otherwise stock lt1. I still have mine installed (z28 egr) with my hooker super comps. Maybe someone who has deleted the EGR will chime in. But don't think you can just remove the tube and have the engine running normally without doing something else.

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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #7 of 10 (permalink) Old 01-28-2013, 12:44 PM
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Did you also unhook the EGR vacuum line? Have you had your PCM reprogrammed to eliminate EGR?

If the EGR valve is still functioning, its going to let the engine suck in unmetered air, which will cause issues.

Also, when the PCM, if not reprogrammed, commands the EGR on, it also does several things to compensate for the EGR entering the combustion chamber, including a significant amount of spark advance. This needs to be programmed out.

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post #8 of 10 (permalink) Old 01-28-2013, 02:05 PM
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From Qalo's SS Handbook -

Hesitation, stumble, skipping, missing
Probably the most common problem among our cars. Remember hesitation and stumble are more than likely fuel, exhaust, or intake related and skipping and missing are common among ignition and timing problems.

Hesitation and Stumble
EGR Valve and/or Solenoid
Fuel Filter Clogged
Fuel Pump going bad
Fuel sending unit connections melting on fuel pump
Catalytic Converter clogged, glowing red
Idle Air Control Valve
MAF Sensor
Throttle Position Sensor

Skipping and Missing
Heat shield grounding on the plug, remove them.
Bad Spark plug wire
Bad Spark Plug
Optispark going bad
Ignition Coil going bad
Plugs are arching, check at night.


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post #9 of 10 (permalink) Old 01-28-2013, 02:07 PM
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Quote:
Originally Posted by cletus284 View Post
Did you also unhook the EGR vacuum line? Have you had your PCM reprogrammed to eliminate EGR?

If the EGR valve is still functioning, its going to let the engine suck in unmetered air, which will cause issues.

Also, when the PCM, if not reprogrammed, commands the EGR on, it also does several things to compensate for the EGR entering the combustion chamber, including a significant amount of spark advance. This needs to be programmed out.
I agree with this. Most of the time people have stumbles, it is because additional air until the motor which is not being anticipated. Make sure everything is tight and get your air pump and EGR programmed out.


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post #10 of 10 (permalink) Old 01-28-2013, 06:38 PM Thread Starter
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Stumble off the line.

I think I'm just going to put the egr tube on for now. Hoping to build a 383 soon. Then ill get all tge programming done at once.


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