Here is a real hard 1 for someone......

[Rated_X]

I have a 2000 Chevy S10 Blazer ZR2
First of all here is what i have replaced in it.
Fuel Filter
Crank Sensor
Cam Sensor
Mass Air Flow Sensor
Distributor Cap
Rotor Button
Spark Plug Wires
Spark Plugs
Checked Fuel Pressure it stays between 58 and 62 but 60 most of time.


Now for symptoms....
I get in it cold it starts runs like a top no misses nothing.
I drive it around neighborhood for about 30 mins runs fine until i start up a big hill and up my driveway engine starts stalling backfireing and missing and i mind you it is not in converter lockup it does shift back to first gear engine seems really hot but temp guage reads only about 200 so it when engine stalls it misses, backfires and will not take any gas but will start back in park and run fine except a little hesitation of gas but still runs considerably better kick it in reverse no change runs great actually if it stalls thats the only way to move it anywhere i can turn it around and back it anywhere no problems it is normal but the minute i drop into a forward gear it idles perfect but if you go to give gas it backfires spark knocks and hesitates tries to kill engine battery light flashes and all let up on gas engine returns to normal idle and runs fine but your not going forward. turn blazer off let it cool 3 or 4 hours and it returns to normal anyone got any answers for that ????

it does not throw any codes except if you keep making it backfire it will eventually throw crank sensor code caused by the backfiring.

[MT-2500]

Originally Posted by Rated_X

I have a 2000 Chevy S10 Blazer ZR2
First of all here is what i have replaced in it.
Fuel Filter
Crank Sensor
Cam Sensor
Mass Air Flow Sensor
Distributor Cap
Rotor Button
Spark Plug Wires
Spark Plugs
Checked Fuel Pressure it stays between 58 and 62 but 60 most of time.


Now for symptoms....
I get in it cold it starts runs like a top no misses nothing.
I drive it around neighborhood for about 30 mins runs fine until i start up a big hill and up my driveway engine starts stalling backfireing and missing and i mind you it is not in converter lockup it does shift back to first gear engine seems really hot but temp guage reads only about 200 so it when engine stalls it misses, backfires and will not take any gas but will start back in park and run fine except a little hesitation of gas but still runs considerably better kick it in reverse no change runs great actually if it stalls thats the only way to move it anywhere i can turn it around and back it anywhere no problems it is normal but the minute i drop into a forward gear it idles perfect but if you go to give gas it backfires spark knocks and hesitates tries to kill engine battery light flashes and all let up on gas engine returns to normal idle and runs fine but your not going forward. turn blazer off let it cool 3 or 4 hours and it returns to normal anyone got any answers for that ????

it does not throw any codes except if you keep making it backfire it will eventually throw crank sensor code caused by the backfiring.

Proper testing when it acts up instead of throwing parts at it will give you the answer.

First thing when it acts up check for lose of spark or fuel.
What engine and what test have been rub on it?

Post back fuel pressure reading.

The only true test on a fuel pump is to check the direct fuel pressure from fuel pump.
A quick test is to block off the return line and see if fuel pressure comes up to 75-85 lbs.
But do not run the pump at full pressure very long.
Also when testing fuel pump and pressure you need to tape a gauge to outside windshield or outside mirror and drive it on the road for 20 -30 minutes
until the pump gets has run a while to check for a pump fading out after hot.

Hard to start cold or hot and fuel pressure testing guide lines.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
If pump has full pressure with return line blocked and low pressure without it blocked most usually the fuel pressure regulator is leaking or not holding pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak in system.
Post back fuel pressure readings.

[mike2004tct]

Originally Posted by MT-2500

Proper testing when it acts up instead of throwing parts at it will give you the answer.

.

A few periods, and other punctuations, would help too.