Question about 1999 GMC Envoy

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Check engin light blinks after i changed spider valve

I changed egr valve throttle sencer tune up ect before spider

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In the distributor is a cam sensor, the dist must come out and apart to fix it. When you replaced the injector assembly did you replace the fuel press regulator also? If not I would do that first.

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Your blazer has central fuel injection (CFI). You said you changed injectors, but your injector in inside the intake manifold, and only has one injector and a "spider" of nylon tubes from the central injector to each intake port. It is common for these spiders to break, causing fuel to leak into the inside of the manifold, and cause problems like you described. The spiders are available as reconditioned and are quite expensive,

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I think its the transmission.

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I have a 94 chevy lumina it idles high in park and when i put it in gear it stalls i have replaced (one of the o2 sencers, egr vaule, map sencer, trottle sencer, and another sencer but not sure what it is....

throttle position sensor can cause the high idle as will a hole in the egr valve tube as far as stalling as soon as u put in to gear could be torque converter not unlocking but id check the egr tube first

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It is the vORTRC4.3 iT IS THE VORTECH 4.3 ENGINE. I have replaced timing chain & gears, Distributer, and fuel filter, fuel injector "SPIDER", i HAVE CHANGED OUT PLUGS & WIRES AND THIS THING STILL...

Sounds like a possible Idle Air Control valve, or more likely there is carbon stuck in the EGR valve. If the EGR valve is stuck open because of carbon chunks, the engine will run very rough, barely idle, and surge. Remove the EGR valve, clean the inside of it with carb cleaner, and replace the gasket with a screened gasket. This doesnt allow carbon the reach the valve and clog it again. Valve is located on front of the intake manifold. . .under the rubber intake boot going into the throttle body

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check the all vacuum pipes is their any leaks.

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Engine managment light is illuminated and the engine is not running unevenly

its a dummy light and its probly in the emsission system somewhere like a bad O2 sensor or a bad EGR valve PCV valve something vaccuum controlled get it put on a diagnostic machine to find out for sure (the dealership has the best diagnostics machines for your car) also you may want to look over all your vaccuum lines also to make sure that none of them are cracked or leaking because that will make the engine light come on as well.

May 06, 2009 | 2002 Daewoo Lanos

1 Answer


I have a 1999 Protege 1.6L with 93,000 miles. And a
1996 1.5L with 170,000 miles.
When my light came on, I got the EGR code read out at Advance Auto ($0). I googled 'Mazda EGR' and found this is frequently due to carbon buildup in the throttle body. It seems the carbon restricts the flow from the EGR, which then calls for a more open valve, and the error code is "excessive flow". Go figure.

Very easy to disassemble throttle body (just check to see where the EGR line is attached to the intake air path, just prior to injector assembly). Sure enough, a clump of carbon around the EGR port in the throttle body. Cleaned it up with a paper clip, Q-tip, and carburetor cleaner. Total cost < $3.
Cleared to code. No light on now, car runs fine.
If your "EGR VALVE" is bad,
you can get one cheap at the url below, and they take Pay-Pal.
Then you can install it of have it installed.

A less expensive fix is to replace the engine Coolant/Antifreeze "Temp Senser"
This will cut fuel to the injectors if not working properly.
Also replace the engine coolant "Thermostat",
when changing "Temp Senser".
You can pick up both at Auto-Zone for about $35.00.
This fixed our 1996 model. The 1999 model was fixed by replacing the
EGR Valve.

Hope this helps.
"Catch me on the flip"

Jul 22, 2008 | Mazda Protege Cars & Trucks

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