94 Jimmy Dies

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jacoby33

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I am having problems with my Jimmy 94 4.3 L . It idles rough and dies at stops. After I restart it it will run good untill I let off the gas this is when the check engine light comes on at it begins to run rough. I have replaced the spider injector, fuel filter and fuel lines. Used seafoam. I cant seem to fix it. I went to oreilys and had them check the codes and got a 15 44 and 54. I also had the fuel pump replaced about 4 months ago not that it couldn’t be that again. I did change the heater core not to long ago and read something about a fuel pump relay????

I appreciate any help I can get thanks.
 
94 Jimmy Dies - EGR Valve?

I had a similar problem. It sounds like carbon is stuck in the Exhaust Gas Recirculation (EGR) valve, but I think the trouble code is different from the ones you get. Bits of carbon stick in the valve, holding it open and creating vacuum. No problem if you are on the gas, but when you let off, the engine thinks it has a vacuum leak and runs rough or dies.

One way to check if this is the problem sounds crude, but it works. The EGR valve is bolted to the top/front of the intake manifold. Open the hood, and when the engine is running rough, tap the EGR valve sharply using a hammer and long socket extension or similar tool. I have sometimes used the two parts of a "Club" anti-theft device. If the engine smooths out after a few taps, you have just knocked the carbon out and unstuck the valve.

GMC had a recall on 1994 4.3 L engines some years back for this problem, but some of the Jimmys were left out for some reason. I wrote GMC to find out why my Jimmy did not fall in the recall, and they did not really know, so they replaced it for free. I still have the problem from time to time, but I just whack it with the Club and it stops immediately.

Hope that helps.
 
Egr

It sounds like you keep getting pieces of carbon stuck in your EGR valve. While the tapping trick suggested is a temporary fix, you really need to do something a little more permanent.

There is a gasket under the EGR valve and the original had no screen or anything to keep carbon out. GM put out a revised gasket that has a screen to keep pieces from flying in. I have done this to mine with no problem since. Its something to try and its a relatively cheap fix at about 25 bucks for the gasket and just your labor putting it in. Hope this helps.
 
Certainly he could, but like I said above about the tapping trick, its only temporary. His problem will continue. With the high heat in the EGR channel, it causes carbon to form on a continual basis.

He can take the EGR valve off and clean the piece of carbon out which will make it functional again, but without the revised gasket, the problem will continue. Carbon will continue to be released and will continue to get into the valve. The gasket is available at most local auto parts stores and runs around 25 bucks or so - definitly worth a try for such a small amount considering a new EGR valve will run well over 100 bucks and the problem continue.

While the valve is off, clean the channel with throttle body cleaner and a flexible wire bristle brush. Then start the vehicle with the valve will off (it runs and wont hurt it) and rev the engines a few times. You will probably see a cloud of carbon come out the exhaust. Turn vehicle off then replace gasket and valve.

Look up Dorman part #47007. It will show two gaskets, but the one on the left is the one you need. I hope this helps.
 
sound like you could have a egr valve clogged or your catty is causing the problem
 
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