engine stalls
 

Hope someone can help. I bought a 94 S10 Blazer with a 6cyl CPI motor for my son a couple of days ago. Took it for a test drive and the motor sounds great and trans shifts perfect. The next day my son picked it up and drove it for about 7 miles and it ran perfect. It only had a quarter tank of gas so he stopped and filled it up. He then drove about another mile and parked the truck for a couple of hours. He then got in to go to the store and got about a mile from the house when it died. When I got there I stepped on the gas a few times while cranking and it started but sounded like crap then died. We wound up driving it with two feet for a little while then it was fine again. Once again parked it for about 1/2 hour then went to drive it and it wouldn't stay running. Next day replaced the MAP and TPS and went to take it to the mechanic and it started right up but idled rough, drove about 1/4 mile and it stalled again. Any clue to what the problem may be. I have a feeling it may be the EGR valve but the mechanic says it is hard to get to. Anyone know the location of the EGR valve ?

RE: engine stalls
 

If the truck is the 4.3 Vortec with the plastic cover on the top of the engine it should be on the front of the engine near the Thermostat housing, not hard to get at.

RE: engine stalls
 

That is what I thought. I took it to a mechanic and he tried to tell me that they really dont like to try and clean the EGR valve because it is hard to get to and might break but I have done this before in a 95 blazer and it wasnt that hard. He tried to tell me it was in the back of the motor. I only took it to the mechanic because it was throwing a code and needed a fuel filter and with my back I just could't do it.

Do you think the EGR might be my problem.

RE: engine stalls
 

Yep, most definitely could be the EGR.

Before you pull yours, go get the screened gasket - makes it so you don't really need to do it again. When you do pull it, clean it gently, paying particular attention to the area where the pintle seats to make sure it fully closes.

You'll need a 10mm socket and at least 9" extension to get to the right-hand bolt and either a wobble socket or a 10mm wrench to get to the left-hand bolt.

RE: engine stalls
 

Ok, I have cleaned the EGR which was bad, the fuel filter which was filled with dirt, the map sensor, the tps sensor. What else could be makine it run this way. How could it go from running perfect to running like crap after adding gas. On my way to change the fuel pump. After that what is left.

RE: engine stalls
 

Before you replace the fuel pump, have you tested it? I ask because it's a lot of money to spend on a guess.

It might possibly be the fuel pressure regulator and/or 'nut kit' (fuel pressure and return lines), both of which are located under the upper intake plenum. Even better, you don't have to pull the plenum to check, just the Vortec cover and the IMTV (round thing) underneath.


EDIT: more on that here http://www.asashop.org/autoinc/feb2000/techtotech.htm

RE: engine stalls
 

The mechanic checked at the fuel pressure is at 48 PSI with key on and engine off. Pressue is 54 PSI with truck running. Does anyone think that it may be the fuel pump ?

RE: engine stalls
 

WOW WOW WOW Dont waist your money, if the fuel pump works dont bother buying a new one. I just bought a 95 thats been sitting in the garage for 4 years and i have the exact same problem. Yesterday it ran fin and today i was driving with 2 feet again lol. Check under the hood if all your vaccum hoses are connected and not leaking. Change your oil and oil filter. Clean the pcv valve. You can take it to a auto store like advance auto and borrow a code reader. I'll go buy me a new egr valve tomorrow lol good luck

RE: engine stalls
 

I needed a new fuel pump anyway. The float wasn't working so no gas reading. I just hope this time it comes off the lift it runs better. I asked about water in the gas. Truck did sit awhile.

RE: engine stalls
 

Just out of curiousity, How much does a fuel regulator go for. I have checked at the auto parts store and they say a few hundred dollars. Then I go on the computer and can fine one for my year truck for 35.00 new. Whats up with that.