New plenum gaskets new manifold gaskets,New pugs wires rotor cap all AC Delco. New Spider injector and fuel pressure regulator. Also new nut Kit also AC delco. For my problem the truck runs great when cold. As soon as 5 min warm up it starts to idle rough. I un plug the MAP sensor wants to stall but hold gas runs great again? Could it be a bad MAP sensor?

 

Been doing some research ANYONE have an opinion on this.. I've read it could be the water temp. sensor.? Like when it warms up it's not reading correctly and makes the engine run rich? Thoughts?

 

I got a bluetooth scanner for my 95. It was $30 on amazon and so far it can actually connect via the Torque App and give me information unlike the parts store scanners. Besides that you can ohm out the temp sensor and it should have a general resistance based on what temperature it is reading.

 

Well I put a new temp sensor in it today. Still did the same thing it was cheap enough. I have a code reader.I read them today and was saying Barometric pressure was to low.So now leaning toward the MAP sensor.

 

I've never have had this much problem with this 4.3 blazer. I've owned many astro vans with well over 200k on them. This is my second blazer. Thinking about junking this pos. It's a shame has low miles but throwing momey at it is getting to me. The new spider injector when started goes to 52lbs. When I shut it off it gose to about 42 to 48 and stays there. I've red it should stay at 52lbs.. ive had both intakes off the upper one off twice. I see no leaks. All new gaskets new nut kit. No vacuum leaks. New map sensor new rotor and cap and wires and plugs gapped at 45k. All parts are ac delco. Has been no change on how it runs. Runs great when cold warms up about 3 to 4 min runs rich and sputters up and down while holding the gas down. Also new temperature sensor.

 

Mine used to idle bad, can't remember what the code it was throwing was but It had to do with the MAF sensor. I purchased a can of electronic connector cleaner and sprayed the hell out of the inside of the sensor, removed from the vehicle of course and once re installed blazer ran great. Cheap thing to try.


https://blazerforum.com/forum/tech-a...leaning-40420/

 

This is a 95 does not have a maf sensor. Thanks tho.

 

Took the intake off it yet again today. Turned the key on to see if I could see the New parts were leaking. Nothing. I spayed water and soap on the lines and nut kit and fuel pressure regulator. No Bubbles.... When the key is on it goes up to about 62lbs now but when I shut it off it very very slowly goes down.Like it will be around 40lbs after 10 min. So is there anywhere else it could be leaking out?

 

 

Welp I see a lot of people looking but no ideas..I put a new EGR on today and new pvc as well. Guess what still runs the same.....If the gasket is bad for the spider injector intake does anyone know if this could cause this problem? I spray carb cleaner around and its not sucking in air so wonder if could be a internal problem.?