EGR Valve

[pondod]

anybody know where the EGR Valve is located for a 94 Chevrolet S-10 Blazer 4.3L Vortec? Also could this help with starting problems, and hard breaking then stalling? Any help is much appreciated!

[rlith]

It's located in front of the engine directly under the intake port... That said, a clogged EGR will cause rough idle.. Your problem sounds more like a severe vac leak... Pull and check the brake booster hose going to the upper plenum for leaks, also check the rest of your vac hoses... One of these is probably your issue more so than the EGR... If you really wanna pull your egr, pull it, clean it with carb cleaner and a wire brush, make sure the pintle is clear and replace...

[pondod]

Thanks for the help! Pulled it Cleaned it, but still having problems with the truck starting. Also did a full tune up, replaced fuel filter, PCV, and fuel pump relay. I can get it to start with some starting fluid, and it runs great once started, just having problems when the motor cools off to restart. Vac all looks ok, and can hear the fuel pump humming when key is in on position. Also checked the Fuel pressure and its ok. Any other suggestions?

[rlith]

Pull your upper plenum and look for signs of washing (where one side is cleaner than the other) If the passenger side is washed, it's your CPI, if the driver's side is washed, it's your nut kit..If you do replace the CPI, replace the nut kit as well.

[pondod]

How hard is it to replace the CPI? Also have any idea what that will cost?

[rlith]

Very easy to replace... Cost will be about 250.00 from Advance Auto Parts....(DO NOT BUY ONLINE! If you do, you will be hard pressed returning it under warranty as you will be without your truck while it's being shipped...etc) The nut kit is $45.00 from the dealer (Dealer item only) Overall the job takes about 40 mins for a begginer...

Remove the upper plenum... Put paper towls in ALL intake holes (prevents dropping something down into the cylinders) Pull each poppet nozzle... Disconnect wire connector... Pull CPI. Install in reverse..(Doesn't matter which hose goes to what cylinder as it is batch fired)... Torque bolts in sequence to 8 ft pounds... Drive...

[mjohn]

rlith...
You make this sound simple...

Had mine replaced a few months ago...
Now, I am blessed with what I call good gas milage...

It is great to have this done...

How long before one has to do this again...?

Mine has 142,000 miles...1993...

[rharmon]

I have a '93 S-10 blazer that had similar problems. By CPI do you mean the fuel injector? If you do, it cost me $499.95 for the part alone. Then another $85 for the fuel lines and like $15 for the upper intake gasket. And then there was labor...

[pondod]

What exactly is the CPI? Calling around to locate one and nobody seems to know what I am talking about. Is it me or are they the dummies??? You never know when talking to some of these people, they dont sound too bright

[rharmon]

I always thought the CPI was the type of fuel injector. I think that's what he's talking about. You have to remove the upper intake gasket and the injector looks like an octopus when you take it out. It has 6 lines(3 on each side I think). Atleast that's how it was in my '93 blazer. Depending on what type of engine you have it can be very costly or not too bad. If you have the 4.3 Vortec "W" code S-10 blazer like you said above, read my previous post. If one of those 6 lines is bad you have to replace the whole injector which is $500. Plus they'll probably advise you to replace the fuel lines leading in to the injector which is another $85. My blazer runs good now but that fix almost broke me. You could atleast have someone take a look at those lines to see if any of them are leaking. I know by reading consumer reviews on this model of blazers that the fuel injector is prone to leaking. Mine lasted 133,000 miles before it leaked. Good luck!

[pondod]

Thanks for the help! Im just kinda hoping that this is all thats wrong with it. What was wrong with yours when you replaced it?

[rharmon]

First of all the injector problem didn't pick up a code on the GM dealership's scanner so it took them a little while to find the problem. One of the 6 lines or hoses that are part of the injector unit was leaking. When I would be stopped at a red light or if my blazer was just idling it would start to die out or idle real low until it died. It didn't do it very often. Just like once or twice a day. When I'd be driving at a reasonable speed it would be fine. Turned out one that one line was leaking. Look at your VIN on the blazer. The 10 digit or so from the left is probably a "W". I think it's that way with all vortec engines.

With the year of my blazer they told me you can't replace just that one line, you have to replace the whole unit. If that's your problem maybe you can get a cheaper price that $500 but I don't think it'd be that much lower.

[pondod]

Yeah mine is a "W", but I am wondering if this is going to help me, my main problem is getting it to start when the motor is cold. I can get it to start with some starting fluid, and it runs fine after starting, just as soon as that motor cools it will not start back up. Replaced the fuel filter, fuel pump relay, a full tune up, and I can hear the fuel pump humming. But the other day when I was driving it I also had it stall out on me at a light, not sure what to do.

[rharmon]

Yeah that's weird. My injector problem was about a month ago. Within the last week I had another problem with my blazer quitting so much I couldn't drive it anywhere. This took the dealership a day and a half to figure out that it was a bad iginition module and a faulty PCM. My blazer runs great now. But it's hard to say if an ignition module is your problem. I'm just telling you that's what was wrong with mine, other than the CPI injector issue.

[rlith]

Originally Posted by rharmon

I have a '93 S-10 blazer that had similar problems. By CPI do you mean the fuel injector? If you do, it cost me $499.95 for the part alone. Then another $85 for the fuel lines and like $15 for the upper intake gasket. And then there was labor...

Holy shiat! It's only $250.00 at advance auto parts!