4.3 lacks pickup

[BlazerLT]

Originally Posted by DetroitMuscle

I want to know why nothing changed when the EGR was unplugged.

Ive always ditched the smog systems first but this car needs to keep em due to its daily duty.

Because the EGR is closed at idle. It only opens when cruising.

[DetroitMuscle]

Originally Posted by twistedtech

For starters,if the plug gap is off either way it will affect alot of different things.Wrong plugs,cheap wires or what ever will cause issues as well.The timing can handle more than a 0 base,try it 6,8 maybe even 10.As far as the in tank fuel cleaners,save your money,they only clean the pintle and the pintle alone.A real carbon clean,ie:motovac, will clean all,intake runners,valves etc etc.

Im using the delco plugs it came with(not originals but OEM), as well as delco wires. The gap is .035.

I honestly havnt had the time to mess with the timing. I will try to get to it this weekend.

[DetroitMuscle]

Originally Posted by BlazerLT

Because the EGR is closed at idle. It only opens when cruising.

Ahhh, ok. They never made it past the first day of ownership on previous vehicles. always bypassed them.



Now what am I looking or listening or feeling for and does it have to be warm or cold?

[BlazerLT]

Just a stupid question here, but did you change the cap and rotor?

And how many miles on it again?

[DetroitMuscle]

Originally Posted by BlazerLT

Just a stupid question here, but did you change the cap and rotor?

And how many miles on it again?

Yeah cap/rotor/plugs/wires/all filters and fluids. It has 147K on it. its a 92 TBI.

[DetroitMuscle]

I can just cap the "tit" coming out of the round thing with on the passenger side of the manifold/TBI unit that supplys the EGR valve with vacuum, right?

[DetroitMuscle]

I forgot to mention, I did have the EGR off the vehicle this past late spring, I soaked it for 24 hours in seafoam, it was clean when I reinstalled it, I didnt use a screened gasket and it is tight. It was filthy.

[BlazerLT]

Originally Posted by DetroitMuscle

Yeah cap/rotor/plugs/wires/all filters and fluids. It has 147K on it. its a 92 TBI.

You know what made a difference with mine?..... a new O2 sensor. They have to be changed every 100,000 miles at the worst.

It is the most important sensor on that engine seeing it controls so much. Even though you don't have a check engine light doesn't mean it is worn out, they still can be within tolerances and have the engine not running very well.

So, timing and a new O2 sensor....

Oh, how is the fuel filter?

[DetroitMuscle]

Originally Posted by BlazerLT

You know what made a difference with mine?..... a new O2 sensor. They have to be changed every 100,000 miles at the worst.

It is the most important sensor on that engine seeing it controls so much. Even though you don't have a check engine light doesn't mean it is worn out, they still can be within tolerances and have the engine not running very well.

So, timing and a new O2 sensor....

Oh, how is the fuel filter?

Just replaced, happen to know the part # for the o2? Id rather order then go to the store and wait for someone that speaks english to help me.


I can tell you right now that my fuel filter was OE, as well as the plugs and wires. Im quite sure its OE as well.

Thanks for more tips, Im sure it needs to be replaced anyways. I know there was alot of carbon in the motor( gone now thanks to elbow grease and wood carver tools) when I got it. Prolly fuggled up like I suspected, All this crap when its cold outside, why cant crap break when its warm?

[Cloud Strife]

I am going to be replacing my o2 sensors here this weekend so I will let you guys know if it helps or not. I can't believe there is 4 of them on a 99' Blazer. If am sort of in a similar situation as you.

[BlazerLT]

Originally Posted by DetroitMuscle

Just replaced, happen to know the part # for the o2? Id rather order then go to the store and wait for someone that speaks english to help me.


I can tell you right now that my fuel filter was OE, as well as the plugs and wires. Im quite sure its OE as well.

Thanks for more tips, Im sure it needs to be replaced anyways. I know there was alot of carbon in the motor( gone now thanks to elbow grease and wood carver tools) when I got it. Prolly fuggled up like I suspected, All this crap when its cold outside, why cant crap break when its warm?

Oh, so the fuel filter was changed? Ok...

As for the O2 sensor, go with RockAuto and get the parts there, you should be able to get the part number there beofre you buy it.

TIMING, you gotta do the timing as well.

[Marcinko]

Ok 1996 Chevy S-10 4x4 with a newly remanufactured engine (about 1000 miles on it). Cap & Rotor (NEW) Plugs & Wires (NEW) Fuel Pump (NEW and 66 psi at the rail) fuel Filter (NEW)

My old broke engine was getting me 18 MPG. "New" engine getting me 15 MPG .

I know for sure they did not replace the O2 Sensors and my guess is it is the EGR is off my old engine.

1) Obviously the O2 Sensors need to be replaced and EGR soaked or blown out. Understand these two items have a tremendous effect on performance.

2) Checking/Reseting the timing. I have never checked or reset the timing before. I saw BlazerLt's desription on unpluging the ECM connector and reset timing to zero. But how do I put the timing at zero (or 6 or 8 as previously mentioned to improve pick up) or check to make sure it is at zero. By putting it to zero or 6 or 8 do I understand correctly that it will improve pick up in the engine?

Sorry for the silly question(s) I am new to the 4.3 Vortec and want to make sure I do the necessary maintenance to keep it in shape and get the absolute best performance (power/fuel) I can.

[BlazerLT]

Originally Posted by Marcinko

Ok 1996 Chevy S-10 4x4 with a newly remanufactured engine (about 1000 miles on it). Cap & Rotor (NEW) Plugs & Wires (NEW) Fuel Pump (NEW and 66 psi at the rail) fuel Filter (NEW)

My old broke engine was getting me 18 MPG. "New" engine getting me 15 MPG .

I know for sure they did not replace the O2 Sensors and my guess is it is the EGR is off my old engine.

1) Obviously the O2 Sensors need to be replaced and EGR soaked or blown out. Understand these two items have a tremendous effect on performance.

2) Checking/Reseting the timing. I have never checked or reset the timing before. I saw BlazerLt's desription on unpluging the ECM connector and reset timing to zero. But how do I put the timing at zero (or 6 or 8 as previously mentioned to improve pick up) or check to make sure it is at zero. By putting it to zero or 6 or 8 do I understand correctly that it will improve pick up in the engine?

Sorry for the silly question(s) I am new to the 4.3 Vortec and want to make sure I do the necessary maintenance to keep it in shape and get the absolute best performance (power/fuel) I can.

It is considered rude to ask for help in someone elses thread.

Start your own thread and I will help you there.

Don't whore this guy's thread, I am only out to help him here.

I will help you in your own.

[Marcinko]

I think you misunderstood me here BlazerLT. You are helping this guy and I am asking for confirmation of what is being said.

1) Obviously the O2 Sensors need to be replaced and EGR soaked or blown out. Understand these two items have a tremendous effect on performance.

This was more again, confirming what I am reading with your advice.

) Checking/Reseting the timing. I have never checked or reset the timing before. I saw BlazerLt's desription on unpluging the ECM connector and reset timing to zero. But how do I put the timing at zero (or 6 or 8 as previously mentioned to improve pick up) or check to make sure it is at zero. By putting it to zero or 6 or 8 do I understand correctly that it will improve pick up in the engine?


Again, just asking someone to confirm what I am reading so I know that i am getting right.

If it is "rude" for me to make sure that I am understanding what is being written then I'll know next time, that by your standards, I need to just start a new post, refer back to this post, and ask you to re-confirm what i am reading.

[BlazerLT]

On a 1996 you don't touch the timing at all.