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i have a 1995 s-10 blazer. it will not start in the morning unless you spray carb cleaner into air intake. then it will run all day. it has a 4.3 liter vortex engine with 136, 000 on it. it just recently passed inspection in new jersey for emissions evn though the cat rattles. my mechanic has replaced the fuel line, the fuel pump, the map sensor, the egr valve, the engine block temp sensor, the ignition and spark plug wires and the spider and the primary coil wire. he checked out the primary coil and said it is fine. when it runs it runs great. battery is good. it cranks strong. please help us

Submitted: 393 days and 9 hours ago.

Category: Chevy

Value: $15

Status: AWAITING EXPERT REPLY

1995 Chevrolet blazer

Posted by GM Master Tech 01 393 days and 9 hours ago.

Info Request

Did he replace the fuel pressure regulator while he had the upper plenum off for the spider?

393 days and 9 hours ago.

Reply

yes. my mechanis said it was part of the spider assembly

Posted by GM Master Tech 01 393 days and 9 hours ago.

Info Request

You will need to hook up a fuel pressure gauge and let it sit to see if the fuel pressure is bleeding off

393 days and 9 hours ago.

Reply

if it is bleeding off, whats the cause and solution

393 days and 9 hours ago.

Reply

my mechanis said its getting 48 pounds of fuel pressure and doesn't bleed off

Posted by GM Master Tech 01 393 days and 8 hours ago.

Answer

The fuel pressure is to low on your vehicle it should be 58-64 lbs key on engine off. The pump is either bad or the wrong one for your vehicle.

393 days and 8 hours ago.

Reply

<p>the pump was actually replaced twice are we looking at a computer problem maybe?</p>

393 days and 8 hours ago.

Reply

did not work better after the first fuel pump replacement so my mechanic replaced it again. the parts store said they had the returned pump tested and it was working fine

Answer

The pressure is the problem you do not have enough fuel pressure. It does not matter how many times it is replaced if you install the incorrect part. Try a GM pump they look it up by vin you will get the right part.

Edited by GM Master Tech 01 on 10/26/2008 at 5:17 PM

Accepts:
Expert:	GM Master Tech 01
Pos. Feedback:	99.0 %
Answered:	10/26/2008

GM Master Technician

GM certified master technician 10 years experience

393 days and 8 hours ago.

Reply

we'll give it a try and if it works i'll accept your answer

Posted by GM Master Tech 01 393 days and 8 hours ago.

Info Request

Not a problem

383 days and 3 hours ago.

Reply

answer did not help. my mechanic replaced the fuel pump with a gm fuel pump matched by vin #. same problem. finally gave in and took car to chevy dealer. ended up being crankshaft positioner sensor.

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1995 Chevrolet blazer

Info Request

Did he replace the fuel pressure regulator while he had the upper plenum off for the spider?

Reply

yes. my mechanis said it was part of the spider assembly

Info Request

You will need to hook up a fuel pressure gauge and let it sit to see if the fuel pressure is bleeding off

Reply

if it is bleeding off, whats the cause and solution

Reply

my mechanis said its getting 48 pounds of fuel pressure and doesn't bleed off

Answer

The fuel pressure is to low on your vehicle it should be 58-64 lbs key on engine off. The pump is either bad or the wrong one for your vehicle.

Reply

<p>the pump was actually replaced twice are we looking at a computer problem maybe?</p>

Reply

did not work better after the first fuel pump replacement so my mechanic replaced it again. the parts store said they had the returned pump tested and it was working fine

Answer

The pressure is the problem you do not have enough fuel pressure. It does not matter how many times it is replaced if you install the incorrect part. Try a GM pump they look it up by vin you will get the right part.Edited by GM Master Tech 01 on 10/26/2008 at 5:17 PM

Reply

we'll give it a try and if it works i'll accept your answer

Info Request

Not a problem

Reply

answer did not help. my mechanic replaced the fuel pump with a gm fuel pump matched by vin #. same problem. finally gave in and took car to chevy dealer. ended up being crankshaft positioner sensor.

Related Chevy Questions

The pressure is the problem you do not have enough fuel pressure. It does not matter how many times it is replaced if you install the incorrect part. Try a GM pump they look it up by vin you will get the right part.

Edited by GM Master Tech 01 on 10/26/2008 at 5:17 PM